The attached test case fails for me:

junit.framework.ComparisonFailure: null expected:<MyEntity> but was:<null>
	at junit.framework.Assert.assertEquals(Assert.java:81)
	at junit.framework.Assert.assertEquals(Assert.java:87)
	at org.hibernate.proxy.map.TestMapLazyInitializerSerializability.testSerialization(TestMapLazyInitializerSerializability.java:26)

A further problem of this issue is: even initialized MapProxy instances get uninitialized through serialization, losing the entire entity state stored in MapProxy.li.target which is implicitly transient.

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