async-profiling of SPECjvm2008 benchmarks shows that a considerable time is spent creating and throwing internal exceptions like:
 Infer$InferenceException
 Resolve$InapplicableMethodException
 Types$FunctionDescriptorLookupError

These exceptions do not seem to leak outside javac and are only used to deliver asynchronous errors and related diagnostics. Stack trace does not seem relevant there and can be omitted.