Related Documentation : Integrations : Using Ehcache with the Google App Engine : About Google App Engine (GAE) and Ehcache
About Google App Engine (GAE) and Ehcache
The ehcache-googleappengine module combines the speed of Ehcache with the scale of Google's memcache and provides the best of both worlds:
*Speed - Ehcache cache operations take a few microseconds, versus around 60ms for Google's provided client-server cache, memcacheg.
*Cost - Because it uses way less resources, it is also cheaper.
*Object Storage - Ehcache in-process cache works with objects that are not serializable.
Ehcache is compatible and works with Google App Engine. Google App Engine provides a constrained runtime which restricts networking, threading and file system access.
All features of Ehcache can be used except for the DiskStore and replication. Having said that, there are workarounds for these limitations. See Use Cases. As of June 2009, Google App Engine appears to be limited to a heap size of 100MB. (See the article “The Limitations of Google App Engine” at for the evidence of this).
Version 2.3 and higher of Ehcache are compatible with Google App Engine. Older versions will not work.
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