Cannot cast org.glassfish.jersey.inject.hk2.Hk2InjectionManagerFactory to org.glassfish.jersey.internal.inject.InjectionManagerFactory

Question

I am getting the following exception when using javax HTTP client. Any idea why this might be happening?

java.lang.ClassCastException: Cannot cast org.glassfish.jersey.inject.hk2.Hk2InjectionManagerFactory to org.glassfish.jersey.internal.inject.InjectionManagerFactory
    at java.lang.Class.cast(Class.java:3369)
    at org.glassfish.jersey.internal.ServiceFinder$LazyObjectIterator.hasNext(ServiceFinder.java:714)
    at org.glassfish.jersey.internal.inject.Injections.lookupService(Injections.java:112)
    at org.glassfish.jersey.internal.inject.Injections.lookupInjectionManagerFactory(Injections.java:97)
    at org.glassfish.jersey.internal.inject.Injections.createInjectionManager(Injections.java:68)
    at org.glassfish.jersey.client.ClientConfig$State.initRuntime(ClientConfig.java:432)
    at org.glassfish.jersey.internal.util.collection.Values$LazyValueImpl.get(Values.java:341)
    at org.glassfish.jersey.client.ClientConfig.getRuntime(ClientConfig.java:826)
    at org.glassfish.jersey.client.ClientRequest.getConfiguration(ClientRequest.java:285)
    at org.glassfish.jersey.client.JerseyInvocation.validateHttpMethodAndEntity(JerseyInvocation.java:143)
    at org.glassfish.jersey.client.JerseyInvocation.<init>(JerseyInvocation.java:112)
    at org.glassfish.jersey.client.JerseyInvocation.<init>(JerseyInvocation.java:108)
    at org.glassfish.jersey.client.JerseyInvocation.<init>(JerseyInvocation.java:99)
    at org.glassfish.jersey.client.JerseyInvocation$AsyncInvoker.method(JerseyInvocation.java:706)
    at org.glassfish.jersey.client.JerseyInvocation$AsyncInvoker.get(JerseyInvocation.java:566)

Answer 1

It certainly is a classloader issue; I have recently faced the same problem with Jersey 2.35. What In understand, Jersey internals in terms of dependency injection architecture has changed (Refer this post: wypieprz answer<\/a> ).

the contention is between the container class loader (in my case Tomcat JARClassLoader) and web-app class loader (WebbAppClassLoader of Tomcat).

Therefore, in your case (and as was in mine), the 'Hk2InjectionManagerFactory' class and the 'InjectionManagerFactory' class was loaded by different class loaders and therefore the assignment fails with class cast exception.

This caused the problem.