[Java] how to embed Lua script

Embed Lua Script

if( ((String)langCombo.getSelectedItem()).equalsIgnoreCase("lua") ) {
    SwingUtilities.invokeLater(() -> {
        try {
            ScriptEngine luaScript; 
            luaScript = new ScriptEngineManager().getEngineByName("luaj");
            luaScript.put("write", new print());
            luaScript.put("writeln", new println());
            outputPrintLn("<START Lua>");
            luaScript.eval(textTab.getSelectedTextView().getText());
            outputPrintLn("<END Lua>");
        } catch (Exception e) {
            e.printStackTrace();
            outputPrintLn("error\n" + e.getMessage());
        }  
    });
}

public void outputPrint(String text) {
    SwingUtilities.invokeLater( () -> {
        output.append(text );
    });
}    

public void outputPrintLn(String text) {
    SwingUtilities.invokeLater( () -> {
        output.append(text + "\n");
    });
}
 
class print extends OneArgFunction {
    @Override
    public LuaValue call(LuaValue lv) {
        outputPrint(lv.checkstring().tojstring());
        return LuaValue.valueOf(0);
    }
}   
class println extends OneArgFunction {
    @Override
    public LuaValue call(LuaValue lv) {
        outputPrintLn(lv.checkstring().tojstring());
        return LuaValue.valueOf(0);
    }
}