I am developing a web app for GAE/J using the Wicket framework, and I
too find that my application instances often do not survive one minute
before being cycled out (I am the sole source of traffic). One effect
of this, within the app start-up delay, is that this takes out my
singleton PersistenceManagerFactory instance, so I have to recreate a
new one for many interactions with my app.
CODE SNIPPETS
-------------
private static volatile PersistenceManagerFactory g_pmf = null;
// Called before every data exchange with the datastore
public static PersistenceManagerFactory
getPersistenceManagerFactory()
{
if (g_pmf == null)
synchronized (DataExchange.class) // Non-GAE class
{
if (g_pmf == null)
{
loadProperties(); // Non-GAE method
g_pmf =
JDOHelper.getPersistenceManagerFactory(g_sDatabaseMode);
}
}
return g_pmf;
}
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