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diff --git a/challenge-273/luca-ferrari/pljava/src/main/java/Task1.java b/challenge-273/luca-ferrari/pljava/src/main/java/Task1.java
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+
+
+
+package PWC273;
+
+/**
+ * PL/Java implementation for PWC 273
+ * Task 1
+ * See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-273>
+ *
+ *
+ * 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/PWC273-1.jar  luca@rachel:/tmp
+
+
+ * To install into PostgreSQL execute:
+
+ select sqlj.install_jar( 'file:///tmp/PWC273-1.jar', 'PWC273', true );
+ select sqlj.set_classpath( 'public', 'PWC273' );
+
+ select pwc273.task2_pljava();
+
+ and then to redeploy:
+
+ select sqlj.replace_jar( 'file:///tmp/PWC273-1.jar', 'PWC273', 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 = "pwc273",
+	       onNullInput = RETURNS_NULL,
+	       effects = IMMUTABLE )
+    public static final int task1_pljava( String s, String c ) throws SQLException {
+	logger.log( Level.INFO, "Entering pwc273.task1_pljava" );
+
+	if ( c.length() != 1 )
+	    throw new SQLException( "Need a single char!" );
+
+
+	final int[] values = new int[]{ 0, 0 };
+	values[ 1 ] = s.length();
+	Stream.of( s.split( "" ) )
+	    .forEach( cc -> {
+		if ( cc.equals( c ) )
+		     values[ 0 ]++;
+	    } );
+
+	return (int) Math.round( (double) values[ 0 ] / values[ 1 ] * 100 );
+    }
+}