webMethods Knowlegebase : Java Services NullException Service.Invoke() 2nd thread (1790892)

Problem

There seems to be an IS issue when invoking a Flow Service from a Java Service, when user is in a different thread.

This is important as one of the libraries does async programming, so the event handler receives notification in a different thread.

Using Designer "Generate Code" to generate this stub for invoking a Flow Service from Java Service:

/****/

// input

IData input = IDataFactory.create();

// output

IData output = IDataFactory.create();

try{

output = Service.doInvoke( "Default", "simple", input );

}catch( Exception e){

System.out.println("CANNOT CALL SVC");

e.printStackTrace();

}

/****/

That works, but when you wrap the Service.doInvoke in a different thread:

/****/

// input

IData input = IDataFactory.create();

// output

IData output = IDataFactory.create();

try{

output = Service.doInvoke( "Default", "simple", input );

}catch( Exception e){

System.out.println("CANNOT CALL SVC");

e.printStackTrace();

}

/****/

Stack Trace using above code:

jvm 1 | CANNOT CALL SVC

jvm 1 | java.lang.NullPointerException

jvm 1 | at com.wm.app.b2b.server.invoke.InvokeManager.invoke(InvokeManager.java:487)

jvm 1 | at com.wm.app.b2b.server.invoke.InvokeManager.invoke(InvokeManager.java:441)

jvm 1 | at com.wm.app.b2b.server.invoke.InvokeManager.invoke(InvokeManager.java:397)

jvm 1 | at com.wm.app.b2b.server.ServiceManager.invoke(ServiceManager.java:252)

jvm 1 | at com.wm.app.b2b.server.ServiceManager.invoke(ServiceManager.java:93)

jvm 1 | at com.wm.app.b2b.server.Service.doInvoke(Service.java:713)

jvm 1 | at com.wm.app.b2b.server.Service.doInvoke(Service.java:604)

jvm 1 | at STC_INT_EWS.java.lambda$testInvokeFlow$0(java.java:523)

jvm 1 | at java.lang.Thread.run(Thread.java:748)

Stack Trace of using a customer library:

jvm 1 | CANNOT CALL SVC

jvm 1 | java.lang.NullPointerException

jvm 1 | at com.wm.app.b2b.server.invoke.InvokeManager.invoke(InvokeManager.java:487)

jvm 1 | at com.wm.app.b2b.server.invoke.InvokeManager.invoke(InvokeManager.java:441)

jvm 1 | at com.wm.app.b2b.server.invoke.InvokeManager.invoke(InvokeManager.java:397)

jvm 1 | at com.wm.app.b2b.server.ServiceManager.invoke(ServiceManager.java:252)

jvm 1 | at com.wm.app.b2b.server.ServiceManager.invoke(ServiceManager.java:93)

jvm 1 | at com.wm.app.b2b.server.Service.doInvoke(Service.java:713)

jvm 1 | at com.wm.app.b2b.server.Service.doInvoke(Service.java:604)

jvm 1 | at STC_INT_EWS.java$3.notificationEventDelegate(java.java:331)

jvm 1 | at microsoft.exchange.webservices.data.notification.StreamingSubscriptionConnection.issueNotificationEvents(StreamingSubscriptionConnection.java:524)

jvm 1 | at microsoft.exchange.webservices.data.notification.StreamingSubscriptionConnection.handleServiceResponseObject(StreamingSubscriptionConnection.java:418)

jvm 1 | at microsoft.exchange.webservices.data.notification.StreamingSubscriptionConnection.handleResponseObject(StreamingSubscriptionConnection.java:562)

jvm 1 | at microsoft.exchange.webservices.data.core.request.HangingServiceRequestBase.parseResponses(HangingServiceRequestBase.java:218)

jvm 1 | at microsoft.exchange.webservices.data.core.request.HangingServiceRequestBase.access$000(HangingServiceRequestBase.java:60)

jvm 1 | at microsoft.exchange.webservices.data.core.request.HangingServiceRequestBase$1.run(HangingServiceRequestBase.java:330)

jvm 1 | at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)

jvm 1 | at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)

jvm 1 | at java.lang.Thread.run(Thread.java:748)

Reproducible code:

Typo in body -- below is the code to reproduce:

/****/

// input

IData input = IDataFactory.create();

// output

IData output = IDataFactory.create();

try{

new Thread( () -> {

try {

Service.doInvoke( "Default", "simple", input );

} catch( Exception e) {

System.out.println("CANNOT CALL SVC");

e.printStackTrace();

}

}).start();

} catch( Exception e){

System.out.println("CANNOT CALL SVC OUTTER");

e.printStackTrace();

}

/****/