Investigate intermittent test failures related to the ClassFileTransformer

[jasonjkeller]

We occasionally see the following test failures indicating that the Java agent threw an exception when it called the ClassFileTransformer.transform method. The tests eventually pass but it's unclear why this error is occurring in the first place. We should investigate further.

com.newrelic.agent.attributes.AgentAttributeSenderTest > testCustomAttributesInTransaction FAILED
    com.newrelic.agent.tracers.SkipTracerException at AgentAttributeSenderTest.java:56
*** java.lang.instrument ASSERTION FAILED ***: "!errorOutstanding" with message transform method call failed at JPLISAgent.c line: 844
*** java.lang.instrument ASSERTION FAILED ***: "!errorOutstanding" with message transform method call failed at JPLISAgent.c line: 844
*** java.lang.instrument ASSERTION FAILED ***: "!errorOutstanding" with message transform method call failed at JPLISAgent.c line: 844
*** java.lang.instrument ASSERTION FAILED ***: "!errorOutstanding" with message transform method call failed at JPLISAgent.c line: 844
*** java.lang.instrument ASSERTION FAILED ***: "!errorOutstanding" with message transform method call failed at JPLISAgent.c line: 844
*** java.lang.instrument ASSERTION FAILED ***: "!errorOutstanding" with message transform method call failed at JPLISAgent.c line: 844

com.newrelic.agent.service.async.AsyncTransactionServiceTest > testAsyncTransactionServiceTimeout FAILED
    java.lang.AssertionError at AsyncTransactionServiceTest.java:62

The reference to the JPLISAgent means that a Java agent (not necessarily the NR Java agent) threw an exception when it called the transform method.

One theory is that the unit test flickers are due to our use of mockito-inline for mocking and it’s underlying use of a Byte Buddy Java agent. We should try to migrate away from this library for testing and see if the test flickers resolve.

[workato-integration]

https://new-relic.atlassian.net/browse/NR-333080

[kford-newrelic]

Possible "stretch" goal for the current Q?