Metaspace OOME from leaked sun.reflect.DelegatingClassloaders in SerializableClassRegistry

Solution Unverified - Updated -

Issue

  • We reach an OOME on EAP 7.0 with many DelegatingClassLoaders. The heap dump shows these retained under a SerializableClassRegistry map:
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
registry org.jboss.marshalling.reflect.SerializableClassRegistry @ 0x6c0ba9628                                                     |       34,524 |           16 |         2,209,536 |    54,596,392
'- registry org.jboss.marshalling.reflect.UnlockedHashMap @ 0x6c0ba9638                                                            |       34,524 |           48 |         2,209,536 |    54,596,376
   '- table org.jboss.marshalling.reflect.UnlockedHashMap$Table @ 0x6c0ba9668                                                      |       34,524 |           32 |         2,209,536 |    54,596,280
      '- array java.lang.Object[512] @ 0x6c0ba9688                                                                                 |       34,524 |        2,064 |         2,209,536 |    54,596,248
         |- [258] org.jboss.marshalling.reflect.UnlockedHashMap$Item[1] @ 0x6c32dc9c0                                              |       34,414 |           24 |         2,202,496 |    54,361,920
         |  '- [0] org.jboss.marshalling.reflect.UnlockedHashMap$Item @ 0x6c32dc9d8                                                |       34,414 |           24 |         2,202,496 |    54,361,896
         |     '- value org.jboss.marshalling.reflect.UnlockedHashMap @ 0x6c16faa70                                                |       34,414 |           48 |         2,202,496 |    54,361,872
         |        '- table org.jboss.marshalling.reflect.UnlockedHashMap$Table @ 0x6cb50cbc0                                       |       34,414 |           32 |         2,202,496 |    54,361,776
         |           '- array java.lang.Object[65536] @ 0x6cb50cbe0                                                                |       34,414 |      262,160 |         2,202,496 |    54,361,744
         |              |- [48843] org.jboss.marshalling.reflect.UnlockedHashMap$Item[6] @ 0x6cfeab8a0                             |            6 |           40 |               384 |         9,352
         |              |  |- [5] org.jboss.marshalling.reflect.UnlockedHashMap$Item @ 0x6cfeab8c8                                 |            1 |           24 |                64 |         1,552
         |              |  |  '- value org.jboss.marshalling.reflect.SerializableClass @ 0x6cfeab8e0                               |            1 |           64 |                64 |         1,528
         |              |  |     '- nonInitConstructor java.lang.reflect.Constructor @ 0x6cfeab9d0  public java.lang.Object()      |            1 |           80 |                64 |           696
         |              |  |        '- constructorAccessor sun.reflect.GeneratedSerializationConstructorAccessor64829 @ 0x6cfeaba40|            1 |           16 |                64 |           584
         |              |  |           '- <class> class sun.reflect.GeneratedSerializationConstructorAccessor64829 @ 0x6d08f73e0   |            1 |            0 |                64 |           568
         |              |  |              '- <classloader> sun.reflect.DelegatingClassLoader @ 0x6d08f7380                         |            1 |           64 |                64 |           568
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Environment

  • JBoss Enterprise Application Platform (EAP) 7.0.x

Subscriber exclusive content

A Red Hat subscription provides unlimited access to our knowledgebase, tools, and much more.

Current Customers and Partners

Log in for full access

Log In

New to Red Hat?

Learn more about Red Hat subscriptions

Using a Red Hat product through a public cloud?

How to access this content