Error message

[Tracy Hiltbrand]

Hi there!

I've come across an error message that confuses me - I looked in the online list, did a google search - nothing came up!

Here's part of the error output:

 [ERROR]   XYTaskDatasetTest.testEqualsHashCode:65 EqualsVerifier found a problem in class org.jfree.data.gantt.XYTaskDataset.

-> Unable to make field protected transient volatile java.lang.Object[] javax.swing.event.EventListenerList.listenerList accessible: module java.desktop does not "opens javax.swing.event" to unnamed module @32816a91

I captured the entire output in the attached mvn-validate-output.txt

Using java version 1.8:

tracylynne...jfreechart % java -version

java version "1.8.0_311"

Java(TM) SE Runtime Environment (build 1.8.0_311-b11)

Java HotSpot(TM) 64-Bit Server VM (build 25.311-b11, mixed mode)

Any help is much appreciated - thanks!

[Jan Ouwens]

Hi,

I'm sorry, I can't really figure out what's going wrong, based on the information you give.

The error that you mention is related to modules, and therefore can only occur in Java 9 and higher, and not in Java 8 (or 1.8).

Also, your attachment is almost empty. mvn validate will do a syntax check on your pom file and download dependencies, but nothing more. You probably meant to do mvn verify?

Regards,

Jan

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[Tracy Hiltbrand]

Ah - yes, right, I did mean to run verify! 

[Tracy Hiltbrand]

Update: I saw in the verify output that somehow, even though running 'java -version' at the command line indicated that jdk 8 was being used, it was using java 10 or 11. I ended up just deleting homebrew and all its associated downloads and that did the trick.

[Jan Ouwens]

OK, I was indeed confused how module errors could come up on Java 8. Glad you figured it out.

If the problem comes back, it might help to use .withPrefabValues(javax.swing.event.EventListenerList.class, ...) 

You'll need to give it 2 separate instances of EventListenerList as well. You can do the same for all the other classes that come up.

Regards,

Jan

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