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Old 06-02-2016, 04:20 PM
alexr alexr is offline
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Default Mirth Connect 3.2.x - TcpReceiver possible threading issue

I apologize in advanced if this is not the appropriate forum.

Please take a look at the following two code snippets taken from Mirth Connect 3.2.1 source.

public class TcpReceiver extends SourceConnector {
    public void onStart() throws ConnectorTaskException {
        // Create the acceptor thread
        thread = new Thread() {
            public void run()
                while (getCurrentState() == DeployedState.STARTED) {
                    StateAwareSocket socket = null;

public abstract class SourceConnector extends Connector {
     * Start the connector
    public void start() throws ConnectorTaskException, InterruptedException {

        if (isProcessBatch()) {

There appears to be a race condition between the acceptor thread started in the TcpReceiver.onStart() and the current thread. The acceptor thread is checking for DeployedState.STARTED while the current thread is trying to set it.
If the acceptor thread wins this race the result is the channel reporting it is deployed and working but not being able to establish TCP connections.
I was not able to expose this behavior with stock mirth 3.2.1 code. I was however able to get it by sleeping the current thread and giving the acceptor thread time to start. I also ran into this issue while developing a custom connector (which is why I am here to begin with) and following the pattern in TcpReceiver. My code was doing some work in the acceptor thread before the while loop so I was getting the issue pretty consistently.

I have also searched for bug reports that would hint at this problem but the closest I've found is this: https://www.mirthproject.org/communi...ad.php?t=13426
I would appreciate any feedback related to this code.
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Old 06-07-2016, 10:01 AM
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narupley narupley is offline
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Thanks for the catch, I created an issue for it: MIRTH-3979

Out of curiosity, what sort of custom connector are you building?
Step 1: JAVA CACHE...DID YOU CLEAR ...wait, ding dong the witch is dead?

Nicholas Rupley
Work: 949-237-6069
Always include what Mirth Connect version you're working with. Also include (if applicable) the code you're using and full stacktraces for errors (use CODE tags). Posting your entire channel is helpful as well; make sure to scrub any PHI/passwords first.

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Old 06-07-2016, 12:08 PM
alexr alexr is offline
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I word for an LIS developer. We build some TCP-like connectors to interface with clinical analyzers for mirth v2 and I was trying to adapt them for v3.
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