I'm attempting to build an HL7 Client using the Hapi Library. Fortunately there are examples that show clearly what to do. See the SendLotsOfMessages Example here: https://hapifhir.github.io/hapi-hl7v2/xref/ca/uhn/hl7v2/examples/SendLotsOfMessages.html
Unfortunately when I run the code, a null pointer exception occurs: java.lang.NullPointerException at ca.uhn.hl7v2.app.Responder.processMessage(Responder.java:91) at ca.uhn.hl7v2.app.Receiver$Grunt.run(Receiver.java:127) at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) at java.base/java.lang.Thread.run(Thread.java:829) Curiously this does not occur when the code provided in SendAndReceiveAMessage example is used, where a server is set up and a client sends. Debugging through the code the problem line is where an ApplicationRouter is addressed. When just a client is used, this is not instantiated with setApplicationRouter but this setter is used when the client is created in the SendAndReceiveAMessage example. How can a client be made to function without a server? Thanks Ian
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