NoClassDefFoundError in spring

Question

Hello,

I wrote a Spring application which runs on Weblogic 10.3. In this application I have some JMS Queue consumers.

Sometimes I got an error when the application is closing or opening (I saw this error in both situation) saying:

    java.lang.NoClassDefFoundError: org/springframework/jms/connection/SmartConnectionFactory
        at org.springframework.jms.connection.ConnectionFactoryUtils.releaseConnection(ConnectionFactoryUtils.java:72)
        at org.springframework.jms.listener.AbstractJmsListeningContainer.refreshSharedConnection(AbstractJmsListeningContainer.java:385)at org.springframework.jms.listener.DefaultMessageListenerContainer.refreshConnectionUntilSuccessful(DefaultMessageListenerContainer.java:779)
        at org.springframework.jms.listener.DefaultMessageListenerContainer.recoverAfterListenerSetupFailure(DefaultMessageListenerContainer.java:761)
        at org.springframework.jms.listener.DefaultMessageListenerContainer$AsyncMessageListenerInvoker.run(DefaultMessageListenerContainer.java:892)
        at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.ClassNotFoundException: org.springframework.jms.connection.SmartConnectionFactory
        at weblogic.utils.classloaders.GenericClassLoader.findLocalClass(GenericClassLoader.java:283)
        at weblogic.utils.classloaders.GenericClassLoader.findClass(GenericClassLoader.java:256)
        at weblogic.utils.classloaders.ChangeAwareClassLoader.findClass(ChangeAwareClassLoader.java:54)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:303)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
        at weblogic.utils.classloaders.GenericClassLoader.loadClass(GenericClassLoader.java:176)
        at weblogic.utils.classloaders.ChangeAwareClassLoader.loadClass(ChangeAwareClassLoader.java:35)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:316)
        ... 6 more

Why do I get this error and what should I do to solve it? The version of the spring.jar is 2.5.5

Answer 1

That Exception means that the class is not getting loaded into the JVM. Make sure that the spring.jar is in the Weblogic server's classpath or library folder.

Answer 2

It's all very well that you have this class in your war, but in Weblogic, the war has its own classloader. Since your stack trace shows a JMS listener, I'd ask: where is the listener? If it's in the war, then you have a mystery. But it sure looks as though it's somewhere else, and it's that somewhere else that would be missing this Spring class.