title: Using HSQLDB in Google-App-Engine
body: <p>In my light web-app that will work on google-app-engine, I want to use HSQLDB. </p>
  
  <p>While initiating the HSQLDB I'm using a url like that: "jdbc:hsqldb:file:./database/".</p>
  
  <p>On local tomcat everything goes well but on google-app-engine I'm getting the exception below;</p>
  
  <pre><code>Constructor threw exception; nested exception is com.hp.hpl.jena.sdb.SDBException: SQL Exception while connecting to database: jdbc:hsqldb:file:./database/appname : File input/output error ./database/appname.properties java.security.AccessControlException: access denied (java.io.FilePermission ./database write)
  </code></pre>
  
  <p>Does anyone can give a clue to define the proper url for running an HSQL db on google-app-engine?</p>