Serious bug in Google Gson Json library may cause application hang

A serious bug in Google Gson Json library has shown a potential application hang in high concurrency and heavy load installations, usually where you have more than 100 users and/or huge mailboxes working concurrently.

The library may encounter a threading deadlock inside Google code, causing all subsequent request of the same function to lock waiting forever, creating threads objects indefinetly up to an out of memory.

https://github.com/google/gson/issues/764

https://github.com/google/gson/pull/1832

https://github.com/google/gson/issues/625