-- java.lang.OutOfMemoryError: GC overhead limit exceeded

This kind of OutOfMemoryError can be caused if user requests drown the available resources in the JVM. When this occurs, performance will degrade aggressively. This will eventually require a restart or the application may recover.

-- What to do to resolve this exception?

If there is no custom code running, then this is a sign that your processing load requires a larger heap size.  

If you¿re executing your own code, you¿ve got a tough job at hand ¿ to review your code.
Check for memory intensive operations, like creating lots of temporary objects in a loop; See if created object(s) can be reused.

You can increasing the heap size (Xms and Xmx) in JVM arguments.  Do not exceed 1024m.  If you think you need more than that, you should contact Axway support.