title: EhCache overflow to disk at specific path
body: <p>I am using ehcache with hibernate in my application. 
  here is configuration of ehcache.xml</p>
  
  <pre><code>&lt;ehcache&gt;
      &lt;diskStore path="java.io.tmpdir"/&gt;        
  
      &lt;defaultCache
              maxElementsInMemory="10"
              eternal="false"
              timeToIdleSeconds="120"
              timeToLiveSeconds="120"
              overflowToDisk="true"
              diskSpoolBufferSizeMB="300"
              maxElementsOnDisk="10000000"
              diskPersistent="false"
              diskExpiryThreadIntervalSeconds="120"
              memoryStoreEvictionPolicy="LRU"
              /&gt;
  &lt;/ehcache&gt;
  </code></pre>
  
  <p>my diskStore path is java.io.tmpdir, which i want to change to my application path as <strong>${WebApp}/DiskStore</strong></p>