When running H2 in the Google AppEngine for Java, a AccessControlException could be thrown.

h2/src/main/org/h2/store/fs/FileSystemDisk.java

@@ -286,9 +286,15 @@ public class FileSystemDisk extends FileSystem {
     }
 
     private boolean canWriteInternal(File file) {
+        try {
             if (!file.canWrite()) {
                 return false;
             }
+        } catch (Exception e) {
+            // workaround for GAE which throws a
+            // java.security.AccessControlException
+            return false;
+        }
         // File.canWrite() does not respect windows user permissions,
         // so we must try to open it using the mode "rw".
         // See also http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4420020