[singular][issue #2221] the plural builder method now nullchecks its argument with configurable results.

31 files changed, 253 insertions, 28 deletions

diff --git a/test/transform/resource/after-delombok/BuilderDefaultsWarnings.java b/test/transform/resource/after-delombok/BuilderDefaultsWarnings.java
index 4df98158..04cd3bbb 100644
--- a/test/transform/resource/after-delombok/BuilderDefaultsWarnings.java
+++ b/test/transform/resource/after-delombok/BuilderDefaultsWarnings.java
@@ -38,6 +38,7 @@ public class BuilderDefaultsWarnings {
 		}
 		@java.lang.SuppressWarnings("all")
 		public BuilderDefaultsWarnings.BuilderDefaultsWarningsBuilder items(final java.util.Collection<? extends String> items) {
+			if (items == null) throw new java.lang.NullPointerException("items cannot be null");
 			if (this.items == null) this.items = new java.util.ArrayList<String>();
 			this.items.addAll(items);
 			return this;
diff --git a/test/transform/resource/after-delombok/BuilderSingularAnnotatedTypes.java b/test/transform/resource/after-delombok/BuilderSingularAnnotatedTypes.java
index 6bd3390c..4cc247ef 100644
--- a/test/transform/resource/after-delombok/BuilderSingularAnnotatedTypes.java
+++ b/test/transform/resource/after-delombok/BuilderSingularAnnotatedTypes.java
@@ -36,6 +36,7 @@ class BuilderSingularAnnotatedTypes {
 		}
 		@java.lang.SuppressWarnings("all")
 		public BuilderSingularAnnotatedTypes.BuilderSingularAnnotatedTypesBuilder foos(final java.util.Collection<? extends @MyAnnotation @NonNull String> foos) {
+			if (foos == null) throw new java.lang.NullPointerException("foos cannot be null");
 			if (this.foos == null) this.foos = new java.util.ArrayList<@MyAnnotation @NonNull String>();
 			this.foos.addAll(foos);
 			return this;
@@ -63,6 +64,7 @@ class BuilderSingularAnnotatedTypes {
 		}
 		@java.lang.SuppressWarnings("all")
 		public BuilderSingularAnnotatedTypes.BuilderSingularAnnotatedTypesBuilder bars(final java.util.Map<? extends @MyAnnotation @NonNull String, ? extends @MyAnnotation @NonNull Integer> bars) {
+			if (bars == null) throw new java.lang.NullPointerException("bars cannot be null");
 			if (this.bars$key == null) {
 				this.bars$key = new java.util.ArrayList<@MyAnnotation @NonNull String>();
 				this.bars$value = new java.util.ArrayList<@MyAnnotation @NonNull Integer>();
diff --git a/test/transform/resource/after-delombok/BuilderSingularAnnotatedTypesWithSetterPrefix.java b/test/transform/resource/after-delombok/BuilderSingularAnnotatedTypesWithSetterPrefix.java
index d1047567..90cc5570 100644
--- a/test/transform/resource/after-delombok/BuilderSingularAnnotatedTypesWithSetterPrefix.java
+++ b/test/transform/resource/after-delombok/BuilderSingularAnnotatedTypesWithSetterPrefix.java
@@ -36,6 +36,7 @@ class BuilderSingularAnnotatedTypesWithSetterPrefix {
 		}
 		@java.lang.SuppressWarnings("all")
 		public BuilderSingularAnnotatedTypesWithSetterPrefix.BuilderSingularAnnotatedTypesWithSetterPrefixBuilder withFoos(final java.util.Collection<? extends @MyAnnotation @NonNull String> foos) {
+			if (foos == null) throw new java.lang.NullPointerException("foos cannot be null");
 			if (this.foos == null) this.foos = new java.util.ArrayList<@MyAnnotation @NonNull String>();
 			this.foos.addAll(foos);
 			return this;
@@ -63,6 +64,7 @@ class BuilderSingularAnnotatedTypesWithSetterPrefix {
 		}
 		@java.lang.SuppressWarnings("all")
 		public BuilderSingularAnnotatedTypesWithSetterPrefix.BuilderSingularAnnotatedTypesWithSetterPrefixBuilder withBars(final java.util.Map<? extends @MyAnnotation @NonNull String, ? extends @MyAnnotation @NonNull Integer> bars) {
+			if (bars == null) throw new java.lang.NullPointerException("bars cannot be null");
 			if (this.bars$key == null) {
 				this.bars$key = new java.util.ArrayList<@MyAnnotation @NonNull String>();
 				this.bars$value = new java.util.ArrayList<@MyAnnotation @NonNull Integer>();
diff --git a/test/transform/resource/after-delombok/BuilderSingularGuavaListsSets.java b/test/transform/resource/after-delombok/BuilderSingularGuavaListsSets.java
index b6fb5732..650ab2fd 100644
--- a/test/transform/resource/after-delombok/BuilderSingularGuavaListsSets.java
+++ b/test/transform/resource/after-delombok/BuilderSingularGuavaListsSets.java
@@ -41,6 +41,7 @@ class BuilderSingularGuavaListsSets<T> {
 		}
 		@java.lang.SuppressWarnings("all")
 		public BuilderSingularGuavaListsSets.BuilderSingularGuavaListsSetsBuilder<T> cards(final java.lang.Iterable<? extends T> cards) {
+			if (cards == null) throw new java.lang.NullPointerException("cards cannot be null");
 			if (this.cards == null) this.cards = com.google.common.collect.ImmutableList.builder();
 			this.cards.addAll(cards);
 			return this;
@@ -58,6 +59,7 @@ class BuilderSingularGuavaListsSets<T> {
 		}
 		@java.lang.SuppressWarnings("all")
 		public BuilderSingularGuavaListsSets.BuilderSingularGuavaListsSetsBuilder<T> frogs(final java.lang.Iterable<? extends Number> frogs) {
+			if (frogs == null) throw new java.lang.NullPointerException("frogs cannot be null");
 			if (this.frogs == null) this.frogs = com.google.common.collect.ImmutableList.builder();
 			this.frogs.addAll(frogs);
 			return this;
@@ -75,6 +77,7 @@ class BuilderSingularGuavaListsSets<T> {
 		}
 		@java.lang.SuppressWarnings("all")
 		public BuilderSingularGuavaListsSets.BuilderSingularGuavaListsSetsBuilder<T> rawSet(final java.lang.Iterable<?> rawSet) {
+			if (rawSet == null) throw new java.lang.NullPointerException("rawSet cannot be null");
 			if (this.rawSet == null) this.rawSet = com.google.common.collect.ImmutableSet.builder();
 			this.rawSet.addAll(rawSet);
 			return this;
@@ -92,6 +95,7 @@ class BuilderSingularGuavaListsSets<T> {
 		}
 		@java.lang.SuppressWarnings("all")
 		public BuilderSingularGuavaListsSets.BuilderSingularGuavaListsSetsBuilder<T> passes(final java.lang.Iterable<? extends String> passes) {
+			if (passes == null) throw new java.lang.NullPointerException("passes cannot be null");
 			if (this.passes == null) this.passes = com.google.common.collect.ImmutableSortedSet.naturalOrder();
 			this.passes.addAll(passes);
 			return this;
@@ -109,6 +113,7 @@ class BuilderSingularGuavaListsSets<T> {
 		}
 		@java.lang.SuppressWarnings("all")
 		public BuilderSingularGuavaListsSets.BuilderSingularGuavaListsSetsBuilder<T> users(final com.google.common.collect.Table<? extends Number, ? extends Number, ? extends String> users) {
+			if (users == null) throw new java.lang.NullPointerException("users cannot be null");
 			if (this.users == null) this.users = com.google.common.collect.ImmutableTable.builder();
 			this.users.putAll(users);
 			return this;
diff --git a/test/transform/resource/after-delombok/BuilderSingularGuavaMaps.java b/test/transform/resource/after-delombok/BuilderSingularGuavaMaps.java
index a6043475..6af1bf8d 100644
--- a/test/transform/resource/after-delombok/BuilderSingularGuavaMaps.java
+++ b/test/transform/resource/after-delombok/BuilderSingularGuavaMaps.java
@@ -31,6 +31,7 @@ class BuilderSingularGuavaMaps<K, V> {
 		}
 		@java.lang.SuppressWarnings("all")
 		public BuilderSingularGuavaMaps.BuilderSingularGuavaMapsBuilder<K, V> battleaxes(final java.util.Map<? extends K, ? extends V> battleaxes) {
+			if (battleaxes == null) throw new java.lang.NullPointerException("battleaxes cannot be null");
 			if (this.battleaxes == null) this.battleaxes = com.google.common.collect.ImmutableMap.builder();
 			this.battleaxes.putAll(battleaxes);
 			return this;
@@ -48,6 +49,7 @@ class BuilderSingularGuavaMaps<K, V> {
 		}
 		@java.lang.SuppressWarnings("all")
 		public BuilderSingularGuavaMaps.BuilderSingularGuavaMapsBuilder<K, V> vertices(final java.util.Map<? extends Integer, ? extends V> vertices) {
+			if (vertices == null) throw new java.lang.NullPointerException("vertices cannot be null");
 			if (this.vertices == null) this.vertices = com.google.common.collect.ImmutableSortedMap.naturalOrder();
 			this.vertices.putAll(vertices);
 			return this;
@@ -65,6 +67,7 @@ class BuilderSingularGuavaMaps<K, V> {
 		}
 		@java.lang.SuppressWarnings("all")
 		public BuilderSingularGuavaMaps.BuilderSingularGuavaMapsBuilder<K, V> rawMap(final java.util.Map<?, ?> rawMap) {
+			if (rawMap == null) throw new java.lang.NullPointerException("rawMap cannot be null");
 			if (this.rawMap == null) this.rawMap = com.google.common.collect.ImmutableBiMap.builder();
 			this.rawMap.putAll(rawMap);
 			return this;
diff --git a/test/transform/resource/after-delombok/BuilderSingularLists.java b/test/transform/resource/after-delombok/BuilderSingularLists.java
index 971a2851..43eb7702 100644
--- a/test/transform/resource/after-delombok/BuilderSingularLists.java
+++ b/test/transform/resource/after-delombok/BuilderSingularLists.java
@@ -30,6 +30,7 @@ class BuilderSingularLists<T> {
 		}
 		@java.lang.SuppressWarnings("all")
 		public BuilderSingularLists.BuilderSingularListsBuilder<T> children(final java.util.Collection<? extends T> children) {
+			if (children == null) throw new java.lang.NullPointerException("children cannot be null");
 			if (this.children == null) this.children = new java.util.ArrayList<T>();
 			this.children.addAll(children);
 			return this;
@@ -47,6 +48,7 @@ class BuilderSingularLists<T> {
 		}
 		@java.lang.SuppressWarnings("all")
 		public BuilderSingularLists.BuilderSingularListsBuilder<T> scarves(final java.util.Collection<? extends Number> scarves) {
+			if (scarves == null) throw new java.lang.NullPointerException("scarves cannot be null");
 			if (this.scarves == null) this.scarves = new java.util.ArrayList<Number>();
 			this.scarves.addAll(scarves);
 			return this;
@@ -64,6 +66,7 @@ class BuilderSingularLists<T> {
 		}
 		@java.lang.SuppressWarnings("all")
 		public BuilderSingularLists.BuilderSingularListsBuilder<T> rawList(final java.util.Collection<?> rawList) {
+			if (rawList == null) throw new java.lang.NullPointerException("rawList cannot be null");
 			if (this.rawList == null) this.rawList = new java.util.ArrayList<java.lang.Object>();
 			this.rawList.addAll(rawList);
 			return this;
diff --git a/test/transform/resource/after-delombok/BuilderSingularMaps.java b/test/transform/resource/after-delombok/BuilderSingularMaps.java
index 240a6e3b..d10dd090 100644
--- a/test/transform/resource/after-delombok/BuilderSingularMaps.java
+++ b/test/transform/resource/after-delombok/BuilderSingularMaps.java
@@ -46,6 +46,7 @@ class BuilderSingularMaps<K, V> {
 		}
 		@SuppressWarnings("all")
 		public BuilderSingularMaps.BuilderSingularMapsBuilder<K, V> women(java.util.Map<? extends K, ? extends V> women) {
+			if (women == null) throw new NullPointerException("women cannot be null");
 			if (this.women$key == null) {
 				this.women$key = new java.util.ArrayList<K>();
 				this.women$value = new java.util.ArrayList<V>();
@@ -76,6 +77,7 @@ class BuilderSingularMaps<K, V> {
 		}
 		@SuppressWarnings("all")
 		public BuilderSingularMaps.BuilderSingularMapsBuilder<K, V> men(java.util.Map<? extends K, ? extends Number> men) {
+			if (men == null) throw new NullPointerException("men cannot be null");
 			if (this.men$key == null) {
 				this.men$key = new java.util.ArrayList<K>();
 				this.men$value = new java.util.ArrayList<Number>();
@@ -106,6 +108,7 @@ class BuilderSingularMaps<K, V> {
 		}
 		@SuppressWarnings("all")
 		public BuilderSingularMaps.BuilderSingularMapsBuilder<K, V> rawMap(java.util.Map<?, ?> rawMap) {
+			if (rawMap == null) throw new NullPointerException("rawMap cannot be null");
 			if (this.rawMap$key == null) {
 				this.rawMap$key = new java.util.ArrayList<Object>();
 				this.rawMap$value = new java.util.ArrayList<Object>();
@@ -136,6 +139,7 @@ class BuilderSingularMaps<K, V> {
 		}
 		@SuppressWarnings("all")
 		public BuilderSingularMaps.BuilderSingularMapsBuilder<K, V> stringMap(java.util.Map<? extends String, ? extends V> stringMap) {
+			if (stringMap == null) throw new NullPointerException("stringMap cannot be null");
 			if (this.stringMap$key == null) {
 				this.stringMap$key = new java.util.ArrayList<String>();
 				this.stringMap$value = new java.util.ArrayList<V>();
diff --git a/test/transform/resource/after-delombok/BuilderSingularMapsWithSetterPrefix.java b/test/transform/resource/after-delombok/BuilderSingularMapsWithSetterPrefix.java
index bfc2e750..baa8f311 100644
--- a/test/transform/resource/after-delombok/BuilderSingularMapsWithSetterPrefix.java
+++ b/test/transform/resource/after-delombok/BuilderSingularMapsWithSetterPrefix.java
@@ -46,13 +46,15 @@ class BuilderSingularMapsWithSetterPrefix<K, V> {
 		}
 		@SuppressWarnings("all")
 		public BuilderSingularMapsWithSetterPrefix.BuilderSingularMapsWithSetterPrefixBuilder<K, V> withWomen(java.util.Map<? extends K, ? extends V> women) {
-			if (this.women$key == null) {
-				this.women$key = new java.util.ArrayList<K>();
-				this.women$value = new java.util.ArrayList<V>();
-			}
-			for (java.util.Map.Entry<? extends K, ? extends V> $lombokEntry : women.entrySet()) {
-				this.women$key.add($lombokEntry.getKey());
-				this.women$value.add($lombokEntry.getValue());
+			if (women != null) {
+				if (this.women$key == null) {
+					this.women$key = new java.util.ArrayList<K>();
+					this.women$value = new java.util.ArrayList<V>();
+				}
+				for (java.util.Map.Entry<? extends K, ? extends V> $lombokEntry : women.entrySet()) {
+					this.women$key.add($lombokEntry.getKey());
+					this.women$value.add($lombokEntry.getValue());
+				}
 			}
 			return this;
 		}
@@ -76,13 +78,15 @@ class BuilderSingularMapsWithSetterPrefix<K, V> {
 		}
 		@SuppressWarnings("all")
 		public BuilderSingularMapsWithSetterPrefix.BuilderSingularMapsWithSetterPrefixBuilder<K, V> withMen(java.util.Map<? extends K, ? extends Number> men) {
-			if (this.men$key == null) {
-				this.men$key = new java.util.ArrayList<K>();
-				this.men$value = new java.util.ArrayList<Number>();
-			}
-			for (java.util.Map.Entry<? extends K, ? extends Number> $lombokEntry : men.entrySet()) {
-				this.men$key.add($lombokEntry.getKey());
-				this.men$value.add($lombokEntry.getValue());
+			if (men != null) {
+				if (this.men$key == null) {
+					this.men$key = new java.util.ArrayList<K>();
+					this.men$value = new java.util.ArrayList<Number>();
+				}
+				for (java.util.Map.Entry<? extends K, ? extends Number> $lombokEntry : men.entrySet()) {
+					this.men$key.add($lombokEntry.getKey());
+					this.men$value.add($lombokEntry.getValue());
+				}
 			}
 			return this;
 		}
@@ -106,13 +110,15 @@ class BuilderSingularMapsWithSetterPrefix<K, V> {
 		}
 		@SuppressWarnings("all")
 		public BuilderSingularMapsWithSetterPrefix.BuilderSingularMapsWithSetterPrefixBuilder<K, V> withRawMap(java.util.Map<?, ?> rawMap) {
-			if (this.rawMap$key == null) {
-				this.rawMap$key = new java.util.ArrayList<Object>();
-				this.rawMap$value = new java.util.ArrayList<Object>();
-			}
-			for (java.util.Map.Entry<?, ?> $lombokEntry : rawMap.entrySet()) {
-				this.rawMap$key.add($lombokEntry.getKey());
-				this.rawMap$value.add($lombokEntry.getValue());
+			if (rawMap != null) {
+				if (this.rawMap$key == null) {
+					this.rawMap$key = new java.util.ArrayList<Object>();
+					this.rawMap$value = new java.util.ArrayList<Object>();
+				}
+				for (java.util.Map.Entry<?, ?> $lombokEntry : rawMap.entrySet()) {
+					this.rawMap$key.add($lombokEntry.getKey());
+					this.rawMap$value.add($lombokEntry.getValue());
+				}
 			}
 			return this;
 		}
@@ -136,13 +142,15 @@ class BuilderSingularMapsWithSetterPrefix<K, V> {
 		}
 		@SuppressWarnings("all")
 		public BuilderSingularMapsWithSetterPrefix.BuilderSingularMapsWithSetterPrefixBuilder<K, V> withStringMap(java.util.Map<? extends String, ? extends V> stringMap) {
-			if (this.stringMap$key == null) {
-				this.stringMap$key = new java.util.ArrayList<String>();
-				this.stringMap$value = new java.util.ArrayList<V>();
-			}
-			for (java.util.Map.Entry<? extends String, ? extends V> $lombokEntry : stringMap.entrySet()) {
-				this.stringMap$key.add($lombokEntry.getKey());
-				this.stringMap$value.add($lombokEntry.getValue());
+			if (stringMap != null) {
+				if (this.stringMap$key == null) {
+					this.stringMap$key = new java.util.ArrayList<String>();
+					this.stringMap$value = new java.util.ArrayList<V>();
+				}
+				for (java.util.Map.Entry<? extends String, ? extends V> $lombokEntry : stringMap.entrySet()) {
+					this.stringMap$key.add($lombokEntry.getKey());
+					this.stringMap$value.add($lombokEntry.getValue());
+				}
 			}
 			return this;
 		}
diff --git a/test/transform/resource/after-delombok/BuilderSingularNoAuto.java b/test/transform/resource/after-delombok/BuilderSingularNoAuto.java
index a38effc0..6b2fd5b2 100644
--- a/test/transform/resource/after-delombok/BuilderSingularNoAuto.java
+++ b/test/transform/resource/after-delombok/BuilderSingularNoAuto.java
@@ -28,6 +28,7 @@ class BuilderSingularNoAuto {
 		}
 		@java.lang.SuppressWarnings("all")
 		public BuilderSingularNoAuto.BuilderSingularNoAutoBuilder things(final java.util.Collection<? extends String> things) {
+			if (things == null) throw new java.lang.NullPointerException("things cannot be null");
 			if (this.things == null) this.things = new java.util.ArrayList<String>();
 			this.things.addAll(things);
 			return this;
@@ -45,6 +46,7 @@ class BuilderSingularNoAuto {
 		}
 		@java.lang.SuppressWarnings("all")
 		public BuilderSingularNoAuto.BuilderSingularNoAutoBuilder widgets(final java.util.Collection<? extends String> widgets) {
+			if (widgets == null) throw new java.lang.NullPointerException("widgets cannot be null");
 			if (this.widgets == null) this.widgets = new java.util.ArrayList<String>();
 			this.widgets.addAll(widgets);
 			return this;
@@ -62,6 +64,7 @@ class BuilderSingularNoAuto {
 		}
 		@java.lang.SuppressWarnings("all")
 		public BuilderSingularNoAuto.BuilderSingularNoAutoBuilder items(final java.util.Collection<? extends String> items) {
+			if (items == null) throw new java.lang.NullPointerException("items cannot be null");
 			if (this.items == null) this.items = new java.util.ArrayList<String>();
 			this.items.addAll(items);
 			return this;
diff --git a/test/transform/resource/after-delombok/BuilderSingularNoAutoWithSetterPrefix.java b/test/transform/resource/after-delombok/BuilderSingularNoAutoWithSetterPrefix.java
index 57bef625..a023b82a 100644
--- a/test/transform/resource/after-delombok/BuilderSingularNoAutoWithSetterPrefix.java
+++ b/test/transform/resource/after-delombok/BuilderSingularNoAutoWithSetterPrefix.java
@@ -28,6 +28,7 @@ class BuilderSingularNoAutoWithSetterPrefix {
 		}
 		@java.lang.SuppressWarnings("all")
 		public BuilderSingularNoAutoWithSetterPrefix.BuilderSingularNoAutoWithSetterPrefixBuilder withThings(final java.util.Collection<? extends String> things) {
+			if (things == null) throw new java.lang.NullPointerException("things cannot be null");
 			if (this.things == null) this.things = new java.util.ArrayList<String>();
 			this.things.addAll(things);
 			return this;
@@ -45,6 +46,7 @@ class BuilderSingularNoAutoWithSetterPrefix {
 		}
 		@java.lang.SuppressWarnings("all")
 		public BuilderSingularNoAutoWithSetterPrefix.BuilderSingularNoAutoWithSetterPrefixBuilder withWidgets(final java.util.Collection<? extends String> widgets) {
+			if (widgets == null) throw new java.lang.NullPointerException("widgets cannot be null");
 			if (this.widgets == null) this.widgets = new java.util.ArrayList<String>();
 			this.widgets.addAll(widgets);
 			return this;
@@ -62,6 +64,7 @@ class BuilderSingularNoAutoWithSetterPrefix {
 		}
 		@java.lang.SuppressWarnings("all")
 		public BuilderSingularNoAutoWithSetterPrefix.BuilderSingularNoAutoWithSetterPrefixBuilder withItems(final java.util.Collection<? extends String> items) {
+			if (items == null) throw new java.lang.NullPointerException("items cannot be null");
 			if (this.items == null) this.items = new java.util.ArrayList<String>();
 			this.items.addAll(items);
 			return this;
diff --git a/test/transform/resource/after-delombok/BuilderSingularNullBehavior1.java b/test/transform/resource/after-delombok/BuilderSingularNullBehavior1.java
new file mode 100644
index 00000000..7b4e0a29
--- /dev/null
+++ b/test/transform/resource/after-delombok/BuilderSingularNullBehavior1.java
@@ -0,0 +1,160 @@
+import java.util.List;
+import java.util.Collection;
+import lombok.Singular.NullCollectionBehavior;
+class BuilderSingularNullBehavior1 {
+	private List<String> names;
+	private List<String> locations;
+	private List<String> whatevers;
+	private List<String> doohickeys;
+	@java.lang.SuppressWarnings("all")
+	BuilderSingularNullBehavior1(final List<String> names, final List<String> locations, final List<String> whatevers, final List<String> doohickeys) {
+		this.names = names;
+		this.locations = locations;
+		this.whatevers = whatevers;
+		this.doohickeys = doohickeys;
+	}
+	@java.lang.SuppressWarnings("all")
+	public static class BuilderSingularNullBehavior1Builder {
+		@java.lang.SuppressWarnings("all")
+		private java.util.ArrayList<String> names;
+		@java.lang.SuppressWarnings("all")
+		private java.util.ArrayList<String> locations;
+		@java.lang.SuppressWarnings("all")
+		private java.util.ArrayList<String> whatevers;
+		@java.lang.SuppressWarnings("all")
+		private java.util.ArrayList<String> doohickeys;
+		@java.lang.SuppressWarnings("all")
+		BuilderSingularNullBehavior1Builder() {
+		}
+		@java.lang.SuppressWarnings("all")
+		public BuilderSingularNullBehavior1.BuilderSingularNullBehavior1Builder name(final String name) {
+			if (this.names == null) this.names = new java.util.ArrayList<String>();
+			this.names.add(name);
+			return this;
+		}
+		@java.lang.SuppressWarnings("all")
+		public BuilderSingularNullBehavior1.BuilderSingularNullBehavior1Builder names(final java.util.Collection<? extends String> names) {
+			if (names == null) throw new java.lang.NullPointerException("names cannot be null");
+			if (this.names == null) this.names = new java.util.ArrayList<String>();
+			this.names.addAll(names);
+			return this;
+		}
+		@java.lang.SuppressWarnings("all")
+		public BuilderSingularNullBehavior1.BuilderSingularNullBehavior1Builder clearNames() {
+			if (this.names != null) this.names.clear();
+			return this;
+		}
+		@java.lang.SuppressWarnings("all")
+		public BuilderSingularNullBehavior1.BuilderSingularNullBehavior1Builder location(final String location) {
+			if (this.locations == null) this.locations = new java.util.ArrayList<String>();
+			this.locations.add(location);
+			return this;
+		}
+		@java.lang.SuppressWarnings("all")
+		public BuilderSingularNullBehavior1.BuilderSingularNullBehavior1Builder locations(final java.util.Collection<? extends String> locations) {
+			java.util.Objects.requireNonNull(locations, "locations cannot be null");
+			if (this.locations == null) this.locations = new java.util.ArrayList<String>();
+			this.locations.addAll(locations);
+			return this;
+		}
+		@java.lang.SuppressWarnings("all")
+		public BuilderSingularNullBehavior1.BuilderSingularNullBehavior1Builder clearLocations() {
+			if (this.locations != null) this.locations.clear();
+			return this;
+		}
+		@java.lang.SuppressWarnings("all")
+		public BuilderSingularNullBehavior1.BuilderSingularNullBehavior1Builder whatever(final String whatever) {
+			if (this.whatevers == null) this.whatevers = new java.util.ArrayList<String>();
+			this.whatevers.add(whatever);
+			return this;
+		}
+		@java.lang.SuppressWarnings("all")
+		public BuilderSingularNullBehavior1.BuilderSingularNullBehavior1Builder whatevers(final java.util.Collection<? extends String> whatevers) {
+			com.google.common.base.Preconditions.checkNotNull(whatevers, "whatevers cannot be null");
+			if (this.whatevers == null) this.whatevers = new java.util.ArrayList<String>();
+			this.whatevers.addAll(whatevers);
+			return this;
+		}
+		@java.lang.SuppressWarnings("all")
+		public BuilderSingularNullBehavior1.BuilderSingularNullBehavior1Builder clearWhatevers() {
+			if (this.whatevers != null) this.whatevers.clear();
+			return this;
+		}
+		@java.lang.SuppressWarnings("all")
+		public BuilderSingularNullBehavior1.BuilderSingularNullBehavior1Builder doohickey(final String doohickey) {
+			if (this.doohickeys == null) this.doohickeys = new java.util.ArrayList<String>();
+			this.doohickeys.add(doohickey);
+			return this;
+		}
+		@java.lang.SuppressWarnings("all")
+		public BuilderSingularNullBehavior1.BuilderSingularNullBehavior1Builder doohickeys(final java.util.Collection<? extends String> doohickeys) {
+			if (doohickeys != null) {
+				if (this.doohickeys == null) this.doohickeys = new java.util.ArrayList<String>();
+				this.doohickeys.addAll(doohickeys);
+			}
+			return this;
+		}
+		@java.lang.SuppressWarnings("all")
+		public BuilderSingularNullBehavior1.BuilderSingularNullBehavior1Builder clearDoohickeys() {
+			if (this.doohickeys != null) this.doohickeys.clear();
+			return this;
+		}
+		@java.lang.SuppressWarnings("all")
+		public BuilderSingularNullBehavior1 build() {
+			java.util.List<String> names;
+			switch (this.names == null ? 0 : this.names.size()) {
+			case 0: 
+				names = java.util.Collections.emptyList();
+				break;
+			case 1: 
+				names = java.util.Collections.singletonList(this.names.get(0));
+				break;
+			default: 
+				names = java.util.Collections.unmodifiableList(new java.util.ArrayList<String>(this.names));
+			}
+			java.util.List<String> locations;
+			switch (this.locations == null ? 0 : this.locations.size()) {
+			case 0: 
+				locations = java.util.Collections.emptyList();
+				break;
+			case 1: 
+				locations = java.util.Collections.singletonList(this.locations.get(0));
+				break;
+			default: 
+				locations = java.util.Collections.unmodifiableList(new java.util.ArrayList<String>(this.locations));
+			}
+			java.util.List<String> whatevers;
+			switch (this.whatevers == null ? 0 : this.whatevers.size()) {
+			case 0: 
+				whatevers = java.util.Collections.emptyList();
+				break;
+			case 1: 
+				whatevers = java.util.Collections.singletonList(this.whatevers.get(0));
+				break;
+			default: 
+				whatevers = java.util.Collections.unmodifiableList(new java.util.ArrayList<String>(this.whatevers));
+			}
+			java.util.List<String> doohickeys;
+			switch (this.doohickeys == null ? 0 : this.doohickeys.size()) {
+			case 0: 
+				doohickeys = java.util.Collections.emptyList();
+				break;
+			case 1: 
+				doohickeys = java.util.Collections.singletonList(this.doohickeys.get(0));
+				break;
+			default: 
+				doohickeys = java.util.Collections.unmodifiableList(new java.util.ArrayList<String>(this.doohickeys));
+			}
+			return new BuilderSingularNullBehavior1(names, locations, whatevers, doohickeys);
+		}
+		@java.lang.Override
+		@java.lang.SuppressWarnings("all")
+		public java.lang.String toString() {
+			return "BuilderSingularNullBehavior1.BuilderSingularNullBehavior1Builder(names=" + this.names + ", locations=" + this.locations + ", whatevers=" + this.whatevers + ", doohickeys=" + this.doohickeys + ")";
+		}
+	}
+	@java.lang.SuppressWarnings("all")
+	public static BuilderSingularNullBehavior1.BuilderSingularNullBehavior1Builder builder() {
+		return new BuilderSingularNullBehavior1.BuilderSingularNullBehavior1Builder();
+	}
+}
\ No newline at end of file
diff --git a/test/transform/resource/after-delombok/BuilderSingularRedirectToGuava.java b/test/transform/resource/after-delombok/BuilderSingularRedirectToGuava.java
index 4ce5cae5..9ee6823e 100644
--- a/test/transform/resource/after-delombok/BuilderSingularRedirectToGuava.java
+++ b/test/transform/resource/after-delombok/BuilderSingularRedirectToGuava.java
@@ -30,6 +30,7 @@ class BuilderSingularRedirectToGuava {
 		}
 		@java.lang.SuppressWarnings("all")
 		public BuilderSingularRedirectToGuava.BuilderSingularRedirectToGuavaBuilder dangerMice(final java.lang.Iterable<? extends String> dangerMice) {
+			if (dangerMice == null) throw new java.lang.NullPointerException("dangerMice cannot be null");
 			if (this.dangerMice == null) this.dangerMice = com.google.common.collect.ImmutableSet.builder();
 			this.dangerMice.addAll(dangerMice);
 			return this;
@@ -47,6 +48,7 @@ class BuilderSingularRedirectToGuava {
 		}
 		@java.lang.SuppressWarnings("all")
 		public BuilderSingularRedirectToGuava.BuilderSingularRedirectToGuavaBuilder things(final java.util.Map<? extends Integer, ? extends Number> things) {
+			if (things == null) throw new java.lang.NullPointerException("things cannot be null");
 			if (this.things == null) this.things = com.google.common.collect.ImmutableSortedMap.naturalOrder();
 			this.things.putAll(things);
 			return this;
@@ -64,6 +66,7 @@ class BuilderSingularRedirectToGuava {
 		}
 		@java.lang.SuppressWarnings("all")
 		public BuilderSingularRedirectToGuava.BuilderSingularRedirectToGuavaBuilder doohickeys(final java.lang.Iterable<? extends Class<?>> doohickeys) {
+			if (doohickeys == null) throw new java.lang.NullPointerException("doohickeys cannot be null");
 			if (this.doohickeys == null) this.doohickeys = com.google.common.collect.ImmutableList.builder();
 			this.doohickeys.addAll(doohickeys);
 			return this;
diff --git a/test/transform/resource/after-delombok/BuilderSingularSets.java b/test/transform/resource/after-delombok/BuilderSingularSets.java
index c85bbb99..7b905c8c 100644
--- a/test/transform/resource/after-delombok/BuilderSingularSets.java
+++ b/test/transform/resource/after-delombok/BuilderSingularSets.java
@@ -34,6 +34,7 @@ class BuilderSingularSets<T> {
 		}
 		@java.lang.SuppressWarnings("all")
 		public BuilderSingularSets.BuilderSingularSetsBuilder<T> dangerMice(final java.util.Collection<? extends T> dangerMice) {
+			if (dangerMice == null) throw new java.lang.NullPointerException("dangerMice cannot be null");
 			if (this.dangerMice == null) this.dangerMice = new java.util.ArrayList<T>();
 			this.dangerMice.addAll(dangerMice);
 			return this;
@@ -51,6 +52,7 @@ class BuilderSingularSets<T> {
 		}
 		@java.lang.SuppressWarnings("all")
 		public BuilderSingularSets.BuilderSingularSetsBuilder<T> octopodes(final java.util.Collection<? extends Number> octopodes) {
+			if (octopodes == null) throw new java.lang.NullPointerException("octopodes cannot be null");
 			if (this.octopodes == null) this.octopodes = new java.util.ArrayList<Number>();
 			this.octopodes.addAll(octopodes);
 			return this;
@@ -68,6 +70,7 @@ class BuilderSingularSets<T> {
 		}
 		@java.lang.SuppressWarnings("all")
 		public BuilderSingularSets.BuilderSingularSetsBuilder<T> rawSet(final java.util.Collection<?> rawSet) {
+			if (rawSet == null) throw new java.lang.NullPointerException("rawSet cannot be null");
 			if (this.rawSet == null) this.rawSet = new java.util.ArrayList<java.lang.Object>();
 			this.rawSet.addAll(rawSet);
 			return this;
@@ -85,6 +88,7 @@ class BuilderSingularSets<T> {
 		}
 		@java.lang.SuppressWarnings("all")
 		public BuilderSingularSets.BuilderSingularSetsBuilder<T> stringSet(final java.util.Collection<? extends String> stringSet) {
+			if (stringSet == null) throw new java.lang.NullPointerException("stringSet cannot be null");
 			if (this.stringSet == null) this.stringSet = new java.util.ArrayList<String>();
 			this.stringSet.addAll(stringSet);
 			return this;
diff --git a/test/transform/resource/after-delombok/BuilderSingularSetsWithSetterPrefix.java b/test/transform/resource/after-delombok/BuilderSingularSetsWithSetterPrefix.java
index 6c9abf2f..4a025624 100644
--- a/test/transform/resource/after-delombok/BuilderSingularSetsWithSetterPrefix.java
+++ b/test/transform/resource/after-delombok/BuilderSingularSetsWithSetterPrefix.java
@@ -34,6 +34,7 @@ class BuilderSingularSetsWithSetterPrefix<T> {
 		}
 		@java.lang.SuppressWarnings("all")
 		public BuilderSingularSetsWithSetterPrefix.BuilderSingularSetsWithSetterPrefixBuilder<T> withDangerMice(final java.util.Collection<? extends T> dangerMice) {
+			if (dangerMice == null) throw new java.lang.NullPointerException("dangerMice cannot be null");
 			if (this.dangerMice == null) this.dangerMice = new java.util.ArrayList<T>();
 			this.dangerMice.addAll(dangerMice);
 			return this;
@@ -51,6 +52,7 @@ class BuilderSingularSetsWithSetterPrefix<T> {
 		}
 		@java.lang.SuppressWarnings("all")
 		public BuilderSingularSetsWithSetterPrefix.BuilderSingularSetsWithSetterPrefixBuilder<T> withOctopodes(final java.util.Collection<? extends Number> octopodes) {
+			if (octopodes == null) throw new java.lang.NullPointerException("octopodes cannot be null");
 			if (this.octopodes == null) this.octopodes = new java.util.ArrayList<Number>();
 			this.octopodes.addAll(octopodes);
 			return this;
@@ -68,6 +70,7 @@ class BuilderSingularSetsWithSetterPrefix<T> {
 		}
 		@java.lang.SuppressWarnings("all")
 		public BuilderSingularSetsWithSetterPrefix.BuilderSingularSetsWithSetterPrefixBuilder<T> withRawSet(final java.util.Collection<?> rawSet) {
+			if (rawSet == null) throw new java.lang.NullPointerException("rawSet cannot be null");
 			if (this.rawSet == null) this.rawSet = new java.util.ArrayList<java.lang.Object>();
 			this.rawSet.addAll(rawSet);
 			return this;
@@ -85,6 +88,7 @@ class BuilderSingularSetsWithSetterPrefix<T> {
 		}
 		@java.lang.SuppressWarnings("all")
 		public BuilderSingularSetsWithSetterPrefix.BuilderSingularSetsWithSetterPrefixBuilder<T> withStringSet(final java.util.Collection<? extends String> stringSet) {
+			if (stringSet == null) throw new java.lang.NullPointerException("stringSet cannot be null");
 			if (this.stringSet == null) this.stringSet = new java.util.ArrayList<String>();
 			this.stringSet.addAll(stringSet);
 			return this;
diff --git a/test/transform/resource/after-delombok/BuilderSingularToBuilderWithNull.java b/test/transform/resource/after-delombok/BuilderSingularToBuilderWithNull.java
index 2166491b..9a5ea7b3 100644
--- a/test/transform/resource/after-delombok/BuilderSingularToBuilderWithNull.java
+++ b/test/transform/resource/after-delombok/BuilderSingularToBuilderWithNull.java
@@ -22,6 +22,7 @@ class BuilderSingularToBuilderWithNull {
 		}
 		@java.lang.SuppressWarnings("all")
 		public BuilderSingularToBuilderWithNull.BuilderSingularToBuilderWithNullBuilder elems(final java.util.Collection<? extends String> elems) {
+			if (elems == null) throw new java.lang.NullPointerException("elems cannot be null");
 			if (this.elems == null) this.elems = new java.util.ArrayList<String>();
 			this.elems.addAll(elems);
 			return this;
diff --git a/test/transform/resource/after-delombok/BuilderSingularToBuilderWithNullWithSetterPrefix.java b/test/transform/resource/after-delombok/BuilderSingularToBuilderWithNullWithSetterPrefix.java
index 79f11978..1860ba60 100644
--- a/test/transform/resource/after-delombok/BuilderSingularToBuilderWithNullWithSetterPrefix.java
+++ b/test/transform/resource/after-delombok/BuilderSingularToBuilderWithNullWithSetterPrefix.java
@@ -22,6 +22,7 @@ class BuilderSingularToBuilderWithNullWithSetterPrefix {
 		}
 		@java.lang.SuppressWarnings("all")
 		public BuilderSingularToBuilderWithNullWithSetterPrefix.BuilderSingularToBuilderWithNullWithSetterPrefixBuilder withElems(final java.util.Collection<? extends String> elems) {
+			if (elems == null) throw new java.lang.NullPointerException("elems cannot be null");
 			if (this.elems == null) this.elems = new java.util.ArrayList<String>();
 			this.elems.addAll(elems);
 			return this;
diff --git a/test/transform/resource/after-delombok/BuilderSingularWildcardListsWithToBuilder.java b/test/transform/resource/after-delombok/BuilderSingularWildcardListsWithToBuilder.java
index ec05ea2d..29e53768 100644
--- a/test/transform/resource/after-delombok/BuilderSingularWildcardListsWithToBuilder.java
+++ b/test/transform/resource/after-delombok/BuilderSingularWildcardListsWithToBuilder.java
@@ -25,6 +25,7 @@ class BuilderSingularWildcardListsWithToBuilder {
 		}
 		@java.lang.SuppressWarnings("all")
 		public BuilderSingularWildcardListsWithToBuilder.BuilderSingularWildcardListsWithToBuilderBuilder objects(final java.util.Collection<?> objects) {
+			if (objects == null) throw new java.lang.NullPointerException("objects cannot be null");
 			if (this.objects == null) this.objects = new java.util.ArrayList<java.lang.Object>();
 			this.objects.addAll(objects);
 			return this;
@@ -42,6 +43,7 @@ class BuilderSingularWildcardListsWithToBuilder {
 		}
 		@java.lang.SuppressWarnings("all")
 		public BuilderSingularWildcardListsWithToBuilder.BuilderSingularWildcardListsWithToBuilderBuilder numbers(final java.util.Collection<? extends Number> numbers) {
+			if (numbers == null) throw new java.lang.NullPointerException("numbers cannot be null");
 			if (this.numbers == null) this.numbers = new java.util.ArrayList<Number>();
 			this.numbers.addAll(numbers);
 			return this;
diff --git a/test/transform/resource/after-delombok/BuilderSingularWithPrefixes.java b/test/transform/resource/after-delombok/BuilderSingularWithPrefixes.java
index 976866d3..3aa48f5d 100644
--- a/test/transform/resource/after-delombok/BuilderSingularWithPrefixes.java
+++ b/test/transform/resource/after-delombok/BuilderSingularWithPrefixes.java
@@ -19,6 +19,7 @@ class BuilderSingularWithPrefixes {
 		}
 		@java.lang.SuppressWarnings("all")
 		public BuilderSingularWithPrefixes.BuilderSingularWithPrefixesBuilder elems(final java.util.Collection<? extends String> elems) {
+			if (elems == null) throw new java.lang.NullPointerException("elems cannot be null");
 			if (this.elems == null) this.elems = new java.util.ArrayList<String>();
 			this.elems.addAll(elems);
 			return this;
diff --git a/test/transform/resource/after-delombok/BuilderSingularWithPrefixesWithSetterPrefix.java b/test/transform/resource/after-delombok/BuilderSingularWithPrefixesWithSetterPrefix.java
index e2be79de..513c3fe4 100644
--- a/test/transform/resource/after-delombok/BuilderSingularWithPrefixesWithSetterPrefix.java
+++ b/test/transform/resource/after-delombok/BuilderSingularWithPrefixesWithSetterPrefix.java
@@ -19,6 +19,7 @@ class BuilderSingularWithPrefixesWithSetterPrefix {
 		}
 		@java.lang.SuppressWarnings("all")
 		public BuilderSingularWithPrefixesWithSetterPrefix.BuilderSingularWithPrefixesWithSetterPrefixBuilder withElems(final java.util.Collection<? extends String> elems) {
+			if (elems == null) throw new java.lang.NullPointerException("elems cannot be null");
 			if (this.elems == null) this.elems = new java.util.ArrayList<String>();
 			this.elems.addAll(elems);
 			return this;
diff --git a/test/transform/resource/after-delombok/BuilderWithDeprecated.java b/test/transform/resource/after-delombok/BuilderWithDeprecated.java
index 65f8e4e7..584c8042 100644
--- a/test/transform/resource/after-delombok/BuilderWithDeprecated.java
+++ b/test/transform/resource/after-delombok/BuilderWithDeprecated.java
@@ -56,6 +56,7 @@ public class BuilderWithDeprecated {
 		@java.lang.Deprecated
 		@java.lang.SuppressWarnings("all")
 		public BuilderWithDeprecated.BuilderWithDeprecatedBuilder strings(final java.util.Collection<? extends String> strings) {
+			if (strings == null) throw new java.lang.NullPointerException("strings cannot be null");
 			if (this.strings == null) this.strings = new java.util.ArrayList<String>();
 			this.strings.addAll(strings);
 			return this;
@@ -76,6 +77,7 @@ public class BuilderWithDeprecated {
 		@java.lang.Deprecated
 		@java.lang.SuppressWarnings("all")
 		public BuilderWithDeprecated.BuilderWithDeprecatedBuilder numbers(final java.lang.Iterable<? extends Integer> numbers) {
+			if (numbers == null) throw new java.lang.NullPointerException("numbers cannot be null");
 			if (this.numbers == null) this.numbers = com.google.common.collect.ImmutableList.builder();
 			this.numbers.addAll(numbers);
 			return this;
diff --git a/test/transform/resource/after-delombok/BuilderWithToBuilder.java b/test/transform/resource/after-delombok/BuilderWithToBuilder.java
index aa47c430..20043861 100644
--- a/test/transform/resource/after-delombok/BuilderWithToBuilder.java
+++ b/test/transform/resource/after-delombok/BuilderWithToBuilder.java
@@ -50,6 +50,7 @@ class BuilderWithToBuilder<T> {
 		}
 		@java.lang.SuppressWarnings("all")
 		public BuilderWithToBuilder.BuilderWithToBuilderBuilder<T> bars(final java.util.Collection<? extends T> bars) {
+			if (bars == null) throw new java.lang.NullPointerException("bars cannot be null");
 			if (this.bars == null) this.bars = new java.util.ArrayList<T>();
 			this.bars.addAll(bars);
 			return this;
diff --git a/test/transform/resource/after-delombok/CheckerFrameworkBuilder.java b/test/transform/resource/after-delombok/CheckerFrameworkBuilder.java
index 1b993d2a..fad0cf2b 100644
--- a/test/transform/resource/after-delombok/CheckerFrameworkBuilder.java
+++ b/test/transform/resource/after-delombok/CheckerFrameworkBuilder.java
@@ -62,6 +62,7 @@ class CheckerFrameworkBuilder {
 		@org.checkerframework.checker.builder.qual.ReturnsReceiver
 		@java.lang.SuppressWarnings("all")
 		public CheckerFrameworkBuilder.CheckerFrameworkBuilderBuilder names(final java.util.Collection<? extends String> names) {
+			if (names == null) throw new java.lang.NullPointerException("names cannot be null");
 			if (this.names == null) this.names = new java.util.ArrayList<String>();
 			this.names.addAll(names);
 			return this;
diff --git a/test/transform/resource/after-delombok/CheckerFrameworkSuperBuilder.java b/test/transform/resource/after-delombok/CheckerFrameworkSuperBuilder.java
index 31e8bdb5..f2cde1c6 100644
--- a/test/transform/resource/after-delombok/CheckerFrameworkSuperBuilder.java
+++ b/test/transform/resource/after-delombok/CheckerFrameworkSuperBuilder.java
@@ -58,6 +58,7 @@ class CheckerFrameworkSuperBuilder {
 			@org.checkerframework.checker.builder.qual.ReturnsReceiver
 			@java.lang.SuppressWarnings("all")
 			public B names(final java.util.Collection<? extends String> names) {
+				if (names == null) throw new java.lang.NullPointerException("names cannot be null");
 				if (this.names == null) this.names = new java.util.ArrayList<String>();
 				this.names.addAll(names);
 				return self();
diff --git a/test/transform/resource/after-delombok/SuperBuilderBasic.java b/test/transform/resource/after-delombok/SuperBuilderBasic.java
index ef8df1cc..1447e9af 100644
--- a/test/transform/resource/after-delombok/SuperBuilderBasic.java
+++ b/test/transform/resource/after-delombok/SuperBuilderBasic.java
@@ -26,6 +26,7 @@ public class SuperBuilderBasic {
 			}

 			@java.lang.SuppressWarnings("all")

 			public B items(final java.util.Collection<? extends String> items) {

+				if (items == null) throw new java.lang.NullPointerException("items cannot be null");

 				if (this.items == null) this.items = new java.util.ArrayList<String>();

 				this.items.addAll(items);

 				return self();

diff --git a/test/transform/resource/after-delombok/SuperBuilderBasicToBuilder.java b/test/transform/resource/after-delombok/SuperBuilderBasicToBuilder.java
index e9e8774a..1c0d378d 100644
--- a/test/transform/resource/after-delombok/SuperBuilderBasicToBuilder.java
+++ b/test/transform/resource/after-delombok/SuperBuilderBasicToBuilder.java
@@ -69,6 +69,7 @@ public class SuperBuilderBasicToBuilder {
 			}

 			@java.lang.SuppressWarnings("all")

 			public B items(final java.util.Collection<? extends String> items) {

+				if (items == null) throw new java.lang.NullPointerException("items cannot be null");

 				if (this.items == null) this.items = new java.util.ArrayList<String>();

 				this.items.addAll(items);

 				return self();

diff --git a/test/transform/resource/after-delombok/SuperBuilderSingularAnnotatedTypes.java b/test/transform/resource/after-delombok/SuperBuilderSingularAnnotatedTypes.java
index 12c61096..865af859 100644
--- a/test/transform/resource/after-delombok/SuperBuilderSingularAnnotatedTypes.java
+++ b/test/transform/resource/after-delombok/SuperBuilderSingularAnnotatedTypes.java
@@ -32,6 +32,7 @@ class SuperBuilderSingularAnnotatedTypes {
 		}
 		@java.lang.SuppressWarnings("all")
 		public B foos(final java.util.Collection<? extends @MyAnnotation @NonNull String> foos) {
+			if (foos == null) throw new java.lang.NullPointerException("foos cannot be null");
 			if (this.foos == null) this.foos = new java.util.ArrayList<@MyAnnotation @NonNull String>();
 			this.foos.addAll(foos);
 			return self();
@@ -59,6 +60,7 @@ class SuperBuilderSingularAnnotatedTypes {
 		}
 		@java.lang.SuppressWarnings("all")
 		public B bars(final java.util.Map<? extends @MyAnnotation @NonNull String, ? extends @MyAnnotation @NonNull Integer> bars) {
+			if (bars == null) throw new java.lang.NullPointerException("bars cannot be null");
 			if (this.bars$key == null) {
 				this.bars$key = new java.util.ArrayList<@MyAnnotation @NonNull String>();
 				this.bars$value = new java.util.ArrayList<@MyAnnotation @NonNull Integer>();
diff --git a/test/transform/resource/after-delombok/SuperBuilderWithCustomBuilderMethod.java b/test/transform/resource/after-delombok/SuperBuilderWithCustomBuilderMethod.java
index e042b238..4300a5ec 100644
--- a/test/transform/resource/after-delombok/SuperBuilderWithCustomBuilderMethod.java
+++ b/test/transform/resource/after-delombok/SuperBuilderWithCustomBuilderMethod.java
@@ -26,6 +26,7 @@ public class SuperBuilderWithCustomBuilderMethod {
 			}

 			@java.lang.SuppressWarnings("all")

 			public B items(final java.util.Collection<? extends String> items) {

+				if (items == null) throw new java.lang.NullPointerException("items cannot be null");

 				if (this.items == null) this.items = new java.util.ArrayList<String>();

 				this.items.addAll(items);

 				return self();

diff --git a/test/transform/resource/after-delombok/SuperBuilderWithGenerics.java b/test/transform/resource/after-delombok/SuperBuilderWithGenerics.java
index 2bac58f2..6b3d2ff0 100644
--- a/test/transform/resource/after-delombok/SuperBuilderWithGenerics.java
+++ b/test/transform/resource/after-delombok/SuperBuilderWithGenerics.java
@@ -26,6 +26,7 @@ public class SuperBuilderWithGenerics {
 			}

 			@java.lang.SuppressWarnings("all")

 			public B items(final java.util.Collection<? extends String> items) {

+				if (items == null) throw new java.lang.NullPointerException("items cannot be null");

 				if (this.items == null) this.items = new java.util.ArrayList<String>();

 				this.items.addAll(items);

 				return self();

diff --git a/test/transform/resource/after-delombok/SuperBuilderWithGenerics2.java b/test/transform/resource/after-delombok/SuperBuilderWithGenerics2.java
index 0f4a6c54..b03cff07 100644
--- a/test/transform/resource/after-delombok/SuperBuilderWithGenerics2.java
+++ b/test/transform/resource/after-delombok/SuperBuilderWithGenerics2.java
@@ -26,6 +26,7 @@ public class SuperBuilderWithGenerics2 {
 			}

 			@java.lang.SuppressWarnings("all")

 			public B items(final java.util.Collection<? extends String> items) {

+				if (items == null) throw new java.lang.NullPointerException("items cannot be null");

 				if (this.items == null) this.items = new java.util.ArrayList<String>();

 				this.items.addAll(items);

 				return self();

diff --git a/test/transform/resource/after-delombok/SuperBuilderWithGenericsAndToBuilder.java b/test/transform/resource/after-delombok/SuperBuilderWithGenericsAndToBuilder.java
index a6c44c7f..7403ff10 100644
--- a/test/transform/resource/after-delombok/SuperBuilderWithGenericsAndToBuilder.java
+++ b/test/transform/resource/after-delombok/SuperBuilderWithGenericsAndToBuilder.java
@@ -42,6 +42,7 @@ public class SuperBuilderWithGenericsAndToBuilder {
 			}

 			@java.lang.SuppressWarnings("all")

 			public B items(final java.util.Map<? extends Integer, ? extends String> items) {

+				if (items == null) throw new java.lang.NullPointerException("items cannot be null");

 				if (this.items$key == null) {

 					this.items$key = new java.util.ArrayList<Integer>();

 					this.items$value = new java.util.ArrayList<String>();

diff --git a/test/transform/resource/after-delombok/SuperBuilderWithPrefixes.java b/test/transform/resource/after-delombok/SuperBuilderWithPrefixes.java
index 15c8d9b9..324a1443 100644
--- a/test/transform/resource/after-delombok/SuperBuilderWithPrefixes.java
+++ b/test/transform/resource/after-delombok/SuperBuilderWithPrefixes.java
@@ -32,6 +32,7 @@ class SuperBuilderWithPrefixes {
 		}
 		@java.lang.SuppressWarnings("all")
 		public B items(final java.util.Collection<? extends String> items) {
+			if (items == null) throw new java.lang.NullPointerException("items cannot be null");
 			if (this.items == null) this.items = new java.util.ArrayList<String>();
 			this.items.addAll(items);
 			return self();