gistfile1.java

    ScriptingContainer container = new ScriptingContainer();

    container.runScriptlet("" +
        "$test_global=1\n" +
        "Java::IoVertxTestLangJruby::IsolationTest.registerCallback do\n" +
        "puts \"HELLO #{$test_global}\"\n" +
        "end\n");

    callback.run();
    container.runScriptlet("$test_global=2\n");
    callback.run();