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diff --git a/challenge-266/luca-ferrari/pljava/src/main/java/Task2.java b/challenge-266/luca-ferrari/pljava/src/main/java/Task2.java
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+
+
+
+package PWC266;
+
+/**
+ * PL/Java implementation for PWC 266
+ * Task 2
+ * See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-266>
+ *
+ *
+ * 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/PWC266-1.jar  luca@rachel:/tmp
+
+
+ * To install into PostgreSQL execute:
+
+ select sqlj.install_jar( 'file:///tmp/PWC266-1.jar', 'PWC266', true );
+ select sqlj.set_classpath( 'public', 'PWC266' );
+
+ select pwc266.task2_pljava();
+
+ and then to redeploy:
+
+ select sqlj.replace_jar( 'file:///tmp/PWC266-1.jar', 'PWC266', 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 = "pwc266",
+	       onNullInput = RETURNS_NULL,
+	       effects = IMMUTABLE )
+    public static final boolean task2_pljava( int dim, int[] matrix ) throws SQLException {
+	logger.log( Level.INFO, "Entering pwc266.task2_pljava" );
+
+	for ( int row = 0; row < dim; row++ ) {
+	    for ( int col = 0; col < dim; col++ ) {
+
+		if ( row == col || col == dim - row - 1 ) {
+		    if ( matrix[ row * dim + col ] == 0 )
+			return false;
+		}
+		else if ( matrix[ row * dim + col ] != 0 )
+		    return false;
+
+	    }
+	}
+
+	return true;
+
+    }
+}