You might be parsing a text/plain as a multipart. I've blogged about
this here 
http://jeremyblythe.blogspot.com/2009/11/receiving-email-in-google-app-engine.html
I think this is a bug in App Engine.

On Nov 25, 3:42 pm, david ruescas <[email protected]> wrote:
> I added a trace message, here's the value of
> javax.mail.internetMimeMessage.getContentType():
>
> com.dr.reviewengine.MailServlet doPost: multipart content type
> text/plain; charset=ISO-8859-1
>
> thankyou
>
> On 11/25/09, m seleron <[email protected]> wrote:
>
> > Hi,
>
> > I want you to teach the value of
> > [javax.mail.internetMimeMessage.getContentType() ]
> > for confirmation.
>
> > thanks.
>
> > On 11月25日, 午前3:57, david ruescas <[email protected]> wrote:
> >> When receiving email I get an out of memory error when calling
> >> getCount on the MimeMultipart object.
>
> >> Heres the stack trace:
>
> >> Error for /_ah/mail/[email protected]
> >> java.lang.OutOfMemoryError: Java heap space
> >>         at java.util.Arrays.copyOf(Unknown Source)
> >>         at java.io.ByteArrayOutputStream.write(Unknown Source)
> >>         at
> >> javax.mail.internet.MimeMultipart.readTillFirstBoundary(MimeMultipart.java:244)
> >>         at javax.mail.internet.MimeMultipart.parse(MimeMultipart.java:181)
> >>         at
> >> javax.mail.internet.MimeMultipart.getCount(MimeMultipart.java:109)
> >>         at com.dr.reviewengine.MailServlet.doPost(MailServlet.java:85)
> >>         at javax.servlet.http.HttpServlet.service(HttpServlet.java:713)
> >>         at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
> >>         at
> >> org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
> >>         at
> >> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1093)
> >>         at
> >> com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java:35)
> >>         at
> >> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
> >>         at
> >> com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
> >>         at
> >> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
> >>         at
> >> org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:360)
> >>         at
> >> org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
> >>         at
> >> org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
> >>         at
> >> org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:712)
> >>         at
> >> org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
> >>         at
> >> com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:238)
> >>         at
> >> org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139)
> >>         at org.mortbay.jetty.Server.handle(Server.java:313)
> >>         at
> >> org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:506)
> >>         at
> >> org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:830)
> >>         at
> >> com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:76)
> >>         at
> >> org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)
> >>         at
> >> com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:139)
> >>         at
> >> com.google.apphosting.runtime.JavaRuntime.handleRequest(JavaRuntime.java:239)
> >>         at
> >> com.google.apphosting.base.RuntimePb$EvaluationRuntime$6.handleBlockingRequest(RuntimePb.java:5135)
> >>         at
> >> com.google.apphosting.base.RuntimePb$EvaluationRuntime$6.handleBlockingRequest(RuntimePb.java:5133)
> >>         at
> >> com.google.net.rpc.impl.BlockingApplicationHandler.handleRequest(BlockingApplicationHandler.java:24)
> >>         at
> >> com.google.net.rpc.impl.RpcUtil.runRpcInApplication(RpcUtil.java:363)
>
> > --
>
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