I have installed the latest resin. But the configure is different than before. In the past, I wrote <web-app id = 'test'> <classpath id ='test/WEB-INF/classes' source='test/WEB-INF/classes' compile='true'/></web-app>. And create a folder called test under doc. Inside test folder , there are WEB-INF and classes. So, I put my Hello.class under classes directory. In IE, I typed http://localhost:8080/test/Hello. It worked before. But have problem in new version.