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diff --git a/challenge-253/luca-ferrari/pljava/ch-2.java b/challenge-253/luca-ferrari/pljava/ch-2.java
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+++ b/challenge-253/luca-ferrari/pljava/ch-2.java
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+package PWC253;
+
+/**
+ * PL/Java implementation for PWC 253
+ * Task 2
+ * 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;
+
+public class Task2 {
+
+       @Function( onNullInput = RETURNS_NULL, effects = IMMUTABLE )
+       public static final void task2_pljava() throws Exception {
+	   throws Exception( "Not Implemented" );
+       }
+}