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diff --git a/challenge-347/luca-ferrari/pljava/src/main/java/Task2.java b/challenge-347/luca-ferrari/pljava/src/main/java/Task2.java
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+
+
+
+package PWC347;
+
+/**
+ * PL/Java implementation for PWC 347
+ * Task 2
+ * See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-347>
+ *
+ *
+ * To compile on the local machine:
+
+ $ export JAVA_HOME=/usr/lib/jvm/java-17-openjdk-amd64/  # if not already set
+ $ mvn clean build
+ $ scp target/PWC347-1.jar  luca@rachel:/tmp
+
+
+ * To install into PostgreSQL execute:
+
+ select sqlj.install_jar( 'file:///tmp/PWC347-1.jar', 'PWC347', true );
+ select sqlj.set_classpath( 'public', 'PWC347' );
+
+ select pwc347.task2_pljava();
+
+ and then to redeploy:
+
+ select sqlj.replace_jar( 'file:///tmp/PWC347-1.jar', 'PWC347', true );
+
+*/
+
+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.*;
+import java.util.stream.*;
+import java.sql.SQLException;
+import java.util.logging.*;
+import java.sql.ResultSet;
+import java.sql.Date;
+
+public class Task2 {
+
+    private final static Logger logger = Logger.getAnonymousLogger();
+
+    @Function( schema = "pwc347",
+	       onNullInput = RETURNS_NULL,
+	       effects = IMMUTABLE )
+    public static final String task2_pljava( String phone ) throws SQLException {
+	logger.log( Level.INFO, "Entering pwc347.task2_pljava" );
+
+	phone = phone.replaceAll( "-", "" ).replaceAll( " ", "" );
+	List<String> groups = new LinkedList<String>();
+
+	String current = "";
+	for( int i = 0; i < phone.length(); i++ ) {
+	    current += phone.charAt( i );
+	    if ( current.length() % 3 == 0 ) {
+		groups.add( current );
+		current = "";
+	    }
+	}
+
+	if ( current.length() > 0 ) {
+	    groups.add( current );
+	}
+
+
+	if ( groups.get( groups.size() - 1 ).length() != 2
+	     || groups.get( groups.size() - 1 ).length() != 3 ) {
+
+	    String begin = groups.get( groups.size() - 2 );
+	    String end   = groups.get( groups.size() - 1 );
+	    groups.remove( groups.size() - 1 );
+	    groups.remove( groups.size() - 1 );
+
+	    String last = begin + end;
+
+	    groups.add( "" + last.charAt( 0 ) + last.charAt( 1 ) );
+	    groups.add( "" + last.charAt( 2 ) + last.charAt( 3 ) );
+	}
+
+	String result = "";
+	for ( String s : groups ) {
+	    result += s + "-";
+	}
+
+	return result;
+    }
+}