Merge remote-tracking branch 'upstream/master'

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diff --git a/challenge-253/luca-ferrari/pljava/ch-1.java b/challenge-253/luca-ferrari/pljava/ch-1.java
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+++ b/challenge-253/luca-ferrari/pljava/ch-1.java
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+//package PWC253;
+
+/**
+ * PL/Java implementation for PWC 253
+ * Task 1
+ * See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-253>
+ *
+ * To install into PostgreSQL execute:
+
+ select sqlj.install_jar( 'file:///tmp/PWC253.1.jar', 'PWC253', true );
+ select sqlj.set_classpath( 'public', 'PWC253' );
+
+ select task$tn_pljava();
+
+*/
+
+import org.postgresql.pljava.*;
+import org.postgresql.pljava.annotation.Function;
+import static org.postgresql.pljava.annotation.Function.Effects.IMMUTABLE;
+import static org.postgresql.pljava.annotation.Function.OnNullInput.RETURNS_NULL;
+
+import java.util.*;
+
+public class Task1 {
+
+       @Function( onNullInput = RETURNS_NULL, effects = IMMUTABLE )
+       public static final String[] task1_pljava( String separator, String[] words ) {
+	   List<String> result = new LinkedList<String>();
+
+	   for ( String w : words ) {
+	       if ( ! w.contains( separator ) )
+		   result.add( w );
+	       else
+		   result.addAll( w.split( separator ) );
+	   }
+
+	   return result;
+
+       }
+}