Configuring ehcache.xml for Google App Engine
Make sure the following elements are commented out:

<diskStore path="/path/to/store/data"/>

<cacheManagerPeerProviderFactory class= ../>

<cacheManagerPeerListenerFactory class= ../>
Within each cache element, ensure that:

overFlowToDisk and diskPersistent are omitted

persistence strategy=none

no replicators are added

there is no bootstrapCacheLoaderFactory

there is no Terracotta configuration
Use the following Ehcache configuration to get started.
<?xml version="1.0" encoding="UTF-8"?> 
<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:noNamespaceSchemaLocation="ehcache.xsd" > 
    <cacheManagerEventListenerFactory class="" properties=""/> 
    <defaultCache 
       maxEntriesLocalHeap="10000" 
       eternal="false" 
       timeToIdleSeconds="120" 
       timeToLiveSeconds="120" 
       memoryStoreEvictionPolicy="LRU"> 
       <persistence strategy="none"/> 
    </defaultCache> 
<!--Example sample cache--> 
    <cache name="sampleCache1" 
      maxEntriesLocalHeap="10000" 
      maxEntriesLocalDisk="1000" 
      eternal="false" 
      timeToIdleSeconds="300" 
      timeToLiveSeconds="600" 
      memoryStoreEvictionPolicy="LFU" 
       /> 
</ehcache>