Java compiler warning is masking a javac exception, which the compiler plugin doesn't know how to parse

The following javac error is hidden when the project that produced it also contains a java compiler warning. If the code that produces the warning is removed, and the project is rebuilt, then the javac error is output; otherwise, only the warning is output.

This is the error that is hidden by the warning below:

[ERROR] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Compilation failure
Failure executing javac, but could not parse the error:
An exception has occurred in the compiler (1.6.0_17). Please file a bug at the Java Developer Connection (http://java.sun.com/webapps/bugreport) after checking the Bug Parade for duplicates. Include your program and the following diagnostic in your report. Thank you.
com.sun.tools.javac.code.Symbol$CompletionFailure: class file for javax.persistence.AccessType not found

This is the warning that hides the above error when produced:

[WARNING] somefile.java:[79,24] com.sun.jmx.trace.Trace is Sun proprietary API and may be removed in a future release