1 files changed, 57 insertions, 0 deletions
diff --git a/src/java9/com/amadornes/artifactural/gradle/ModifierAccess.java b/src/java9/com/amadornes/artifactural/gradle/ModifierAccess.java
new file mode 100644
index 0000000..69e7dff
--- /dev/null
+++ b/src/java9/com/amadornes/artifactural/gradle/ModifierAccess.java
@@ -0,0 +1,57 @@
+/*
+ * Artifactural
+ * Copyright (c) 2018.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation version 2.1
+ * of the License.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+package com.amadornes.artifactural.gradle;
+
+import java.lang.invoke.MethodHandles;
+import java.lang.invoke.MethodHandles.Lookup;
+import java.lang.invoke.VarHandle;
+import java.lang.reflect.Field;
+import java.lang.reflect.Modifier;
+
+public class ModifierAccess {
+    private static VarHandle MODIFIER_ACCESS = null;
+    private static boolean accessAttempted = false;
+
+    public static synchronized boolean definalize(Field target) {
+        if ((target.getModifiers() & Modifier.FINAL) == 0) {
+            return true;
+        }
+
+        if (MODIFIER_ACCESS == null && !accessAttempted) {
+            try {
+                Lookup lookup = MethodHandles.privateLookupIn(Field.class, MethodHandles.lookup());
+                MODIFIER_ACCESS = lookup.findVarHandle(Field.class, "modifiers", int.class);
+            } catch (NoSuchFieldException | IllegalAccessException e) {
+                throw new RuntimeException("Could not access Field.modifiers to definalize reflection object. Use Java 8, current version: " + System.getProperty("java.version"), e);
+            }
+            accessAttempted = true;
+        }
+        if (MODIFIER_ACCESS != null) {
+            try {
+                MODIFIER_ACCESS.set(target, target.getModifiers() & ~Modifier.FINAL);
+            } catch (IllegalArgumentException e) {
+                throw new RuntimeException("Could not definalize field " + target.getDeclaringClass().getName() + "." + target.getName(), e);
+            }
+            return true;
+        }
+        return false;
+    }
+
+}