A DESCRIPTION OF THE REQUEST :
Our application deserializes the same class in hundreds of threads pretty much all the time. We've hit a bottleneck in ObjectInputStream that is causing all threads to wait on a global ReferenceQueue. Here's the common stack trace seen in 500 threads:

        - waiting to lock <0x00002aab4cd568d8> (a java.lang.ref.ReferenceQueue$Lock)
        at java.io.ObjectStreamClass.processQueue(ObjectStreamClass.java:2234)
        at java.io.ObjectStreamClass.getReflector(ObjectStreamClass.java:2066)
        at java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:602)
        at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1583)
        at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1496)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1732)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
        at com.danga.MemCached.MemCachedClient.loadItems(MemCachedClient.java:1547)


JUSTIFICATION :
This type of concurrency problem is not acceptable.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Threads should not have this contention.
ACTUAL -
Threads are blocked on a global shared Queue.

CUSTOMER SUBMITTED WORKAROUND :
Haven't found one yet...