create or replace java source named "Hello" as
        public class Hello {                             /* Pure Java Code */
                static public String Msg(String tail) {
                        return "Hello " + tail;
                }
        }
/

SQL> select text from user_source where name = 'Hello' order by line;

TEXT
--------------------------------------------------------------------------------
public class Hello {                             /* Pure Java Code */
                static public String Msg(String tail) {
                        return "Hello " + tail;
                }
        }