Hi , Here is my first PL/Java which i have been compiled the documented PL/Java Example. Step 1 ====== bash-4.1$ vi HelloWorld.java -bash-4.1$ pwd /opt/PostgresPlus/9.1AS -bash-4.1$ more HelloWorld.java package com.mycompany.helloworld; public class HelloWorld { public static String helloWorld() { return "Hello World"; } } Step 2 ====== -bash-4.1$ javac HelloWorld.java -bash-4.1$ mkdir -p com/mycompany/helloworld/ -bash-4.1$ cp HelloWorld.class com/mycompany/helloworld/ -bash-4.1$ jar cf helloworld.jar com/mycompany/helloworld/HelloWorld.class Step 3 ===== edb=# SELECT sqlj.install_jar('file:///opt/PostgresPlus/9.1AS/hellowor...