java.lang.ClassNotFoundException: No ClassLoaders found for: myClass

[Dave Alvarado]

Hi,

I'm using Hibernate 4.0.1.Final. Hibernate is having trouble finding one of my classes, and it appears correctly spelled. In my hibernate.cfg.xml file (located at the root of my JAR), I have

		<mapping class="com.myco.fdr.myproject.model.UserRole" />

I load the file like so

	final Configuration configuration = new AnnotationConfiguration();
	configuration.configure("hibernate.cfg.xml");

but when the above executes, the following exception is thrown …

Caused by: java.lang.ClassNotFoundException: No ClassLoaders found for: com.myco.fdr.myproject.model.UserRole
        at org.jboss.mx.loading.LoadMgr3.beginLoadTask(LoadMgr3.java:212)
        at org.jboss.mx.loading.RepositoryClassLoader.loadClassImpl(RepositoryClassLoader.java:521)
        at org.jboss.mx.loading.RepositoryClassLoader.loadClass(RepositoryClassLoader.java:415)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:169)
        at org.hibernate.util.ReflectHelper.classForName(ReflectHelper.java:100)
        at org.hibernate.cfg.AnnotationConfiguration.parseMappingElement(AnnotationConfiguration.java:542)
        ... 31 more

However, I have verified that the class exists at the root of my JAR at com/myco/fdr/myproject/model/UserRole.class . Any ideas why Hibernate isn't able to track it down?

Thanks, - Dave

[Paul Clapham]

Is the Hibernate jar in the classpath as well? Or did you perhaps decide to put the Hibernate jar into the JRE's extensions directory?

[Dave Alvarado]

Hi, The Hibernate classes are also getting included in my Jar. Why are you asking about that, though? The exception is complaining about one of my classes and in the stack trace, one of the Hibernate classes is successfully invoked. - Dave

[Jo Joseph]

Can you post some more code.

[Bill Gorder]

Well AnnotationConfiguration is deprecated. You should be using Configuration now.

so

        final Configuration configuration = new Configuration();  
        configuration.configure("hibernate.cfg.xml"); 

Are you sure you are using javax.persistence.Entity instead of org.hibernate.annotation.Entity? If you are using the hibernate one by accident the AnnotationConfiguration class will ignore it. To test this you can try adding the class pragmatically instead and see what happens.

        final Configuration configuration = new Configuration().configure().addAnnotatedClass(UserRole.class);  
 

Also note that if you have a file called hibernate.cfg.xml on the root of classpath you do not need to specify it explicitly, as this is the default.