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diff --git a/challenge-270/luca-ferrari/pljava/src/main/java/Task1.java b/challenge-270/luca-ferrari/pljava/src/main/java/Task1.java
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+
+
+
+package PWC270;
+
+/**
+ * PL/Java implementation for PWC 270
+ * Task 1
+ * See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-270>
+ *
+ *
+ * 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/PWC270-1.jar  luca@rachel:/tmp
+
+
+ * To install into PostgreSQL execute:
+
+ select sqlj.install_jar( 'file:///tmp/PWC270-1.jar', 'PWC270', true );
+ select sqlj.set_classpath( 'public', 'PWC270' );
+
+ select pwc270.task2_pljava();
+
+ and then to redeploy:
+
+ select sqlj.replace_jar( 'file:///tmp/PWC270-1.jar', 'PWC270', 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 = "pwc270",
+	       onNullInput = RETURNS_NULL,
+	       effects = IMMUTABLE )
+    public static final String[] task1_pljava( int row_size, int[] matrix ) throws SQLException {
+	logger.log( Level.INFO, "Entering pwc270.task1_pljava" );
+
+	List<Integer> rows = new LinkedList<Integer>();
+	List<Integer> cols = new LinkedList<Integer>();
+	List<String> result = new LinkedList<String>();
+
+	// seek for ones
+	for( int row = 0; row < ( matrix.length / row_size ) ; row++ )
+	    for ( int col = 0; col < row_size; col++ )
+		if ( matrix[ row * row_size  + col ] ==  1 ) {
+		    rows.add( row  );
+		    cols.add( col );
+		}
+
+	for ( int i = 0; i < rows.size(); i++ ) {
+	    int current_row = rows.get( i );
+	    int current_col = rows.get( i );
+	    boolean ok      = true;
+
+	    for ( int r = 0; r < rows.size(); r++ )
+		if ( r == i )
+		    continue;
+		else if ( rows.get( r ) == current_row )
+		    ok = false;
+
+	    for ( int c = 0; c < cols.size(); c++ )
+		if ( c == i )
+		    continue;
+		else if ( cols.get( c ) == current_col )
+		    ok = false;
+
+
+	    if ( ok )
+		result.add( String.format( "Row %d Col %d", current_row, current_col ) );
+	}
+
+	String[] to_return = new String[ result.size() ];
+	int i = 0;
+	for ( String s : result )
+	    to_return[ i++ ] = s;
+
+	return to_return;
+
+    }
+}