I have a question on usage with non-blocking IO. I'm setting up a ReadListener
which implements onDataAvailable like this...
@Override
public void onDataAvailable() throws IOException
{
while (input.isReady())
{
int read = input.read(buffer);
// do something with data...
}
// if we're done reading, close up
if (input.isFinished())
{
complete = true;
asyncContext.complete();
}
}
This seems to be working, but I'm getting the following NullPointerException.
SEVERE: Exception while processing an asynchronous request
java.lang.NullPointerException
at
org.apache.catalina.connector.CoyoteAdapter.asyncDispatch(CoyoteAdapter.java:389)
at
org.apache.coyote.http11.AbstractHttp11Processor.asyncDispatch(AbstractHttp11Processor.java:1618)
at
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:631)
at
org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:223)
at
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1597)
at
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1555)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)
After debugging a bit, here is what seems to be happening…
1.) Tomcat calls "onDataAvailable".
2.) The method above runs and reads all of the data. Because all the data is
processed, it comples the context.
3.) Tomcat now tries to call "onAllDataRead", but I think because I've closed
the context it fails.
For reference, here's the section of code from CoyoteAdapter where the NPE is
generated.
Thread.currentThread().setContextClassLoader(newCL);
req.getReadListener().onDataAvailable();
if (request.isFinished()) {
req.getReadListener().onAllDataRead(); // <-- NPE
thrown here
}
My question here, is my code wrong to call asyncContext.complete() like this?
If I restructure it to wait for "onAllDataRead" and complete the context from
there then everything works OK.
Thanks
Dan
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