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diff --git a/challenge-263/luca-ferrari/pljava/src/main/java/Task1.java b/challenge-263/luca-ferrari/pljava/src/main/java/Task1.java
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+
+
+
+package PWC263;
+
+/**
+ * PL/Java implementation for PWC 263
+ * Task 1
+ * See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-263>
+ *
+ *
+ * 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/PWC263-1.jar  luca@rachel:/tmp
+
+
+ * To install into PostgreSQL execute:
+
+ select sqlj.install_jar( 'file:///tmp/PWC263-1.jar', 'PWC263', true );
+ select sqlj.set_classpath( 'public', 'PWC263' );
+
+ select pwc263.task2_pljava();
+
+ and then to redeploy:
+
+ select sqlj.replace_jar( 'file:///tmp/PWC263-1.jar', 'PWC263', 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 Task1 {
+
+    private final static Logger logger = Logger.getAnonymousLogger();
+
+    @Function( schema = "pwc263",
+	       onNullInput = RETURNS_NULL,
+	       effects = IMMUTABLE )
+    public static final int[] task1_pljava( int k, int[] nums ) throws SQLException {
+	logger.log( Level.INFO, "Entering pwc263.task1_pljava" );
+
+	List<Integer> source = new LinkedList<Integer>();
+	for ( int v : nums )
+	    source.add( v );
+
+	Collections.sort( source );
+
+	final List<Integer> result = new LinkedList<Integer>();
+	IntStream.range( 0, source.size() )
+	    .forEach( index -> {
+		    if ( source.get( index ) == k )
+			result.add( index );
+		} );
+
+	int res[] = new int[ result.size() ];
+	for ( int i = 0; i < res.length; i++ )
+	    res[ i ] = result.get( i );
+
+	return res;
+
+    }
+}