Why do I get a Java exception when I close a Simulink Project?

Closing a project throws the following Java exception:

Exception in thread "Simulink Project Thread: 48" java.lang.NullPointerException

at com.mathworks.toolbox.slproject.extensions.dependency.problems.managers.ProblemManagerBase.updateProblems(ProblemManagerBase.java:130)

at com.mathworks.toolbox.slproject.extensions.dependency.problems.managers.ProblemManagerBase.access$500(ProblemManagerBase.java:41)

at com.mathworks.toolbox.slproject.extensions.dependency.problems.managers.ProblemManagerBase$UpdateRunnable.run(ProblemManagerBase.java:242)

at com.mathworks.toolbox.shared.computils.threads.CoalescingExecutor$1.run(CoalescingExecutor.java:62)

at com.mathworks.toolbox.shared.computils.threads.WrappingExecutorService$WrappedRunnable.run(WrappingExecutorService.java:74)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

at java.lang.Thread.run(Thread.java:745)

Answer 1

[MathWorks Support Team]

If you close a Simulink Project while Simulink models are loaded, you can sometimes see a Java NullPointerException in the command window.

You can ignore the Java exception and continue working. To prevent the exception appearing, close all Simulink models before closing the Simulink Project.

For more details, refer to:

https://www.mathworks.com/support/bugreports/1741322