Out of Memory Error due to Monitoring on Some application which requires low memory

[owolabileg]

I found some application which explicitly limits the memory to 25M while running tests. With JavaMOP, we apparently exceed this limit and get an out-of-memory exception:

Here is the error I get on the command line:

Exception in thread "Thread-4" java.lang.OutOfMemoryError: GC overhead limit exceeded
        at java.lang.ThreadLocal$ThreadLocalMap.set(ThreadLocal.java:443)Exception: java.lang.OutOfMemoryError thrown from the UncaughtExceptionHandler in thread "Thread-4"

When I increase the memory limit to 2048M, the exception does not happen.

I don't think this is a bug per se, just something interesting about the limitations of JavaMOP, that JavaMOP will not work below certain memory threshold and we may want to document this somewhere.

Steps to reproduce:

1. Build testAgent.jar with all our properties: javamop -agent -n testAgent -usedb
2. git clone https://github.com/apache/commons-io.git
3. git checkout 7007a1789dba19160ab94536ab3bb8a2e6e637bd
4. cp testAgent.jar from step 1 to commons-io directory
5. Run mvn test after making the <argLine> element of the surefire plugin element inside the <build><plugins> element of commons-io/pom.xml to look like this:

 <argLine>-Xmx25M -javaagent:testAgent.jar</argLine>