Mockito 2.6.4 hangs on JDK 1.8.0_31

We just upgraded to Mockito 2.6.4. When we run our tests on Travis CI without the oracle-java8-installer, JDK 1.8.0_31 is used. We then have two threads hanging in the following state:

"pool-1-thread-2" #24 prio=5 os_prio=0 tid=0x00007fcd208ca800 nid=0x27b3 in Object.wait() [0x00007fcc8c1a1000]
   java.lang.Thread.State: RUNNABLE
        at net.bytebuddy.description.type.TypeDescription$Generic.<clinit>(TypeDescription.java:319)
        at net.bytebuddy.ByteBuddy.subclass(ByteBuddy.java:363)
        at net.bytebuddy.ByteBuddy.subclass(ByteBuddy.java:334)
        at net.bytebuddy.ByteBuddy.subclass(ByteBuddy.java:231)
        at org.mockito.internal.creation.bytebuddy.SubclassBytecodeGenerator.mockClass(SubclassBytecodeGenerator.java:66)
        at org.mockito.internal.creation.bytebuddy.TypeCachingBytecodeGenerator$1.call(TypeCachingBytecodeGenerator.java:35)
        at org.mockito.internal.creation.bytebuddy.TypeCachingBytecodeGenerator$1.call(TypeCachingBytecodeGenerator.java:32)
        at net.bytebuddy.TypeCache.findOrInsert(TypeCache.java:138)
        at net.bytebuddy.TypeCache$WithInlineExpunction.findOrInsert(TypeCache.java:346)
        at net.bytebuddy.TypeCache.findOrInsert(TypeCache.java:161)
        - locked <0x0000000689673668> (a java.lang.Class for com.microsoft.windowsazure.services.servicebus.ServiceBusContract)
        at net.bytebuddy.TypeCache$WithInlineExpunction.findOrInsert(TypeCache.java:355)
        at org.mockito.internal.creation.bytebuddy.TypeCachingBytecodeGenerator.mockClass(TypeCachingBytecodeGenerator.java:30)
        at org.mockito.internal.creation.bytebuddy.SubclassByteBuddyMockMaker.createMockType(SubclassByteBuddyMockMaker.java:71)
        at org.mockito.internal.creation.bytebuddy.SubclassByteBuddyMockMaker.createMock(SubclassByteBuddyMockMaker.java:42)
        at org.mockito.internal.creation.bytebuddy.ByteBuddyMockMaker.createMock(ByteBuddyMockMaker.java:26)
        at org.mockito.internal.util.MockUtil.createMock(MockUtil.java:35)
        at org.mockito.internal.MockitoCore.mock(MockitoCore.java:65)
        at org.mockito.Mockito.mock(Mockito.java:1681)
        at org.mockito.Mockito.mock(Mockito.java:1594)

The issue reported here does not reproduce with Mockito 2.6.3. It also does not reproduce with JDK 1.8.0_121. I assume it’s caused by #891.

(I know upgrading our JDK would be “better”, but if at all possible I’d like to see this fixed anyway, because using the oracle-java8-installer introduces a dependency on the Oracle website, and we’ve seen it being down from time-to-time, thus affecting our build stability.)

CC @raphw. (If you want me to file such tickets directly against Byte Buddy, let me know.)

[mockitoguy]

This bug was really tricky. @raphw and @bric3 THANK you for being super fast in reacting to issues reported by our users. It’s a pleasure working on open source together 🥇

@Stephan202, thank you for confirming the bug is fixed and reporting this issue diligently. It is very helpful to us when we get comprehensive bug reports such as this one.

[Stephan202]

@raphw, thanks! I’ve tested with version 2.6.8 and can confirm the fix works.