Unexpected exception (Error 990)

I have a huge amount of inserts/updates and after a about 850.000 Entities I got the following error:

[ObjectDB 2.4.7_16] Unexpected exception (Error 990)

Generated by Java HotSpot(TM) 64-Bit Server VM 1.6.0_30 (on Windows 7 6.1).
Please report this error on http://www.objectdb.com/database/issue/new
com.objectdb.o.InternalException: null
com.objectdb.o.InternalException
at com.objectdb.o.VUT.k(VUT.java:691)
at com.objectdb.o.VUT.j(VUT.java:360)
at com.objectdb.o.STV.J(STV.java:309)
at com.objectdb.o.PAG.at(PAG.java:991)
at com.objectdb.o.MST.aU(MST.java:483)
at com.objectdb.o.MST.aT(MST.java:434)
at com.objectdb.o.MST.U3(MST.java:407)
at com.objectdb.o.WRA.U3(WRA.java:249)
at com.objectdb.o.LDR.F(LDR.java:532)
at com.objectdb.o.LDR.E(LDR.java:466)
at com.objectdb.o.LDR.z(LDR.java:268)
at com.objectdb.o.OBC.aO(OBC.java:1052)
at com.objectdb.o.OBC.aM(OBC.java:970)
at com.objectdb.jpa.EMImpl.find(EMImpl.java:591)
at com.objectdb.jpa.EMImpl.find(EMImpl.java:514)
at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:240)
at $Proxy33.find(Unknown Source)
at local.jpa.mapping.xmlparsing.RepoEbene1a.getEntity(RepoEbene1a.java:46)
at local.jpa.mapping.xmlparsing.RepoEbene1a.persist(RepoEbene1a.java:105)
at sun.reflect.GeneratedMethodAccessor9.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:319)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
at $Proxy34.persist(Unknown Source)

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