Applying patch 9535311 is failing during autoconfig phase

 While I'm applying 9535311, the patch is failing in autoconfig phase with the following error. I have noticed that I'm not even able to run autconfig outside the patch.

Context Value Management will now update the Context file

java.lang.NoClassDefFoundError: java/util/HashMap

        at

        at oracle.apps.ad.context.AppsContext.<init>(Compiled Code)

        at oracle.apps.ad.context.AppsContext.<init>(Compiled Code)

        at oracle.apps.ad.context.Context2Context.<init>(Compiled Code)

        at oracle.apps.ad.context.Context2Context.<init>(Compiled Code)

        at oracle.apps.ad.context.CtxValueMgt.cmpVerAndRunC2C(Compiled Code)

        at oracle.apps.ad.context.CtxValueMgt.processCtxFile(Compiled Code)