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https://issues.apache.org/jira/browse/METAMODEL-241?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15283001#comment-15283001
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Dennis Du Krøger commented on METAMODEL-241:
--------------------------------------------

It seems to stem from this change from last summer: 
http://hg.openjdk.java.net/jdk8u/jdk8u/jdk/rev/7c1d34773aa6

It's OpenJDK, so it probably didn't show up in an Oracle release until a little 
later.

Search for "Unexpected call when not initialized".

> Deserializing legacy objects fails on some JREs
> -----------------------------------------------
>
>                 Key: METAMODEL-241
>                 URL: https://issues.apache.org/jira/browse/METAMODEL-241
>             Project: Apache MetaModel
>          Issue Type: Bug
>    Affects Versions: 4.5.2
>         Environment: Windows 7
> JDK 1.8.0_77
> Happens both via command line build and test runs in eclipse
>            Reporter: Kasper Sørensen
>
> I just got myself a new laptop and installed a new development environment. 
> For some reason there seems to be a change in the JRE that causes legacy 
> object deserialization to fail with the following causes:
> The failing test is {code}
> java.io.InvalidClassException: cannot bind enum descriptor to a non-enum class
>       at java.io.ObjectStreamClass.initNonProxy(Unknown Source)
>       at java.io.ObjectInputStream.readNonProxyDesc(Unknown Source)
>       at java.io.ObjectInputStream.readClassDesc(Unknown Source)
>       at java.io.ObjectInputStream.readEnum(Unknown Source)
>       at java.io.ObjectInputStream.readObject0(Unknown Source)
>       at java.io.ObjectInputStream.defaultReadFields(Unknown Source)
>       at java.io.ObjectInputStream.readSerialData(Unknown Source)
>       at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
>       at java.io.ObjectInputStream.readObject0(Unknown Source)
>       at java.io.ObjectInputStream.readObject(Unknown Source)
>       at java.util.ArrayList.readObject(Unknown Source)
>       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>       at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
>       at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
>       at java.lang.reflect.Method.invoke(Unknown Source)
>       at java.io.ObjectStreamClass.invokeReadObject(Unknown Source)
>       at java.io.ObjectInputStream.readSerialData(Unknown Source)
>       at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
>       at java.io.ObjectInputStream.readObject0(Unknown Source)
>       at java.io.ObjectInputStream.defaultReadFields(Unknown Source)
>       at java.io.ObjectInputStream.readSerialData(Unknown Source)
>       at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
>       at java.io.ObjectInputStream.readObject0(Unknown Source)
>       at java.io.ObjectInputStream.defaultReadFields(Unknown Source)
>       at java.io.ObjectInputStream.readSerialData(Unknown Source)
>       at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
>       at java.io.ObjectInputStream.readObject0(Unknown Source)
>       at java.io.ObjectInputStream.readObject(Unknown Source)
>       at 
> org.apache.metamodel.util.LegacyDeserializationObjectInputStreamTest.testCreateSerializeAndDeserializeOldSchemaAndQuery(LegacyDeserializationObjectInputStreamTest.java:67)
>       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>       at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
>       at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
>       at java.lang.reflect.Method.invoke(Unknown Source)
>       at junit.framework.TestCase.runTest(TestCase.java:176)
>       at junit.framework.TestCase.runBare(TestCase.java:141)
> ...
> {code}
> and underlying I found that in 
> LegacyDeserializationObjectInputStream.isEnumExpected(...) we run into this 
> problem which causes the rest of the deserialization to go wrong:
> {code}
> java.lang.reflect.InvocationTargetException
>       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>       at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
>       at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
>       at java.lang.reflect.Method.invoke(Unknown Source)
>       at 
> org.apache.metamodel.util.LegacyDeserializationObjectInputStream.isEnumExpected(LegacyDeserializationObjectInputStream.java:257)
>       at 
> org.apache.metamodel.util.LegacyDeserializationObjectInputStream.readClassDescriptor(LegacyDeserializationObjectInputStream.java:231)
>       at java.io.ObjectInputStream.readNonProxyDesc(Unknown Source)
>       at java.io.ObjectInputStream.readClassDesc(Unknown Source)
>       at java.io.ObjectInputStream.readEnum(Unknown Source)
>       at java.io.ObjectInputStream.readObject0(Unknown Source)
>       at java.io.ObjectInputStream.defaultReadFields(Unknown Source)
>       at java.io.ObjectInputStream.readSerialData(Unknown Source)
>       at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
>       at java.io.ObjectInputStream.readObject0(Unknown Source)
>       at java.io.ObjectInputStream.readObject(Unknown Source)
>       at java.util.ArrayList.readObject(Unknown Source)
>       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>       at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
>       at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
>       at java.lang.reflect.Method.invoke(Unknown Source)
>       at java.io.ObjectStreamClass.invokeReadObject(Unknown Source)
>       at java.io.ObjectInputStream.readSerialData(Unknown Source)
>       at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
>       at java.io.ObjectInputStream.readObject0(Unknown Source)
>       at java.io.ObjectInputStream.defaultReadFields(Unknown Source)
>       at java.io.ObjectInputStream.readSerialData(Unknown Source)
>       at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
>       at java.io.ObjectInputStream.readObject0(Unknown Source)
>       at java.io.ObjectInputStream.defaultReadFields(Unknown Source)
>       at java.io.ObjectInputStream.readSerialData(Unknown Source)
>       at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
>       at java.io.ObjectInputStream.readObject0(Unknown Source)
>       at java.io.ObjectInputStream.readObject(Unknown Source)
>       at 
> org.apache.metamodel.util.LegacyDeserializationObjectInputStreamTest.testCreateSerializeAndDeserializeOldSchemaAndQuery(LegacyDeserializationObjectInputStreamTest.java:67)
>       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>       at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
>       at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
>       at java.lang.reflect.Method.invoke(Unknown Source)
>       at junit.framework.TestCase.runTest(TestCase.java:176)
>       at junit.framework.TestCase.runBare(TestCase.java:141)
> ...
> Caused by: java.lang.InternalError: Unexpected call when not initialized
>       at java.io.ObjectStreamClass.requireInitialized(Unknown Source)
>       at java.io.ObjectStreamClass.isEnum(Unknown Source)
>       ... 53 more
> {code}



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