Java JSON protocol left in incorrect state when an exception is thrown during read or write operations

This is the same issue as THRIFT-1473 (Delphi) and THRIFT-3735 (Go) but for the Java library.

The JSON context stack may be left in an incorrect state when an exception is thrown during read or write operations. This leads to further errors while writing/reading the NEXT message, because incorrect characters may be written or expected.