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martinlippert avatar martinlippert commented on June 4, 2024 
Error: Could not find or load main class xxx.yyyy.MyApplication
Caused by: java.lang.ClassNotFoundException: xxx.yyyy.MyApplication

But I am assuming that the main class name that appears on the console is the right one, correct?

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BoykoAlex avatar BoykoAlex commented on June 4, 2024

Even after launching each app separately you still cannot select them all and launch?

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BoykoAlex avatar BoykoAlex commented on June 4, 2024

Overall it seems like the JDT index is corrupted... Can you try deleting <workspace folder>/.metadata/.plugins/org.eclipse.jdt.core folder? Shut down Eclipse, delete the folder, start the Eclipse. I hope it should re-index java types.
STS plugins don't write into the index but rather ask the index to find types with main method... I wouldn't expect this to corrupt the index...
(I have tried launching a few apps at once - seemed okay)

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BoykoAlex avatar BoykoAlex commented on June 4, 2024

Also, it'd be great if you could attach here the projects you're having in the workspace which reproduce the problem for you. It'd likely help us reproducing the issue on our side.

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navy1978 avatar navy1978 commented on June 4, 2024 
Error: Could not find or load main class xxx.yyyy.MyApplication
Caused by: java.lang.ClassNotFoundException: xxx.yyyy.MyApplication

But I am assuming that the main class name that appears on the console is the right one, correct?

Yes the class is correct

Even after launching each app separately you still cannot select them all and launch?

Not sure I have memories that this could not fix the issue, even if today it did it

Overall it seems like the JDT index is corrupted... Can you try deleting <workspace folder>/.metadata/.plugins/org.eclipse.jdt.core folder? Shut down Eclipse, delete the folder, start the Eclipse. I hope it should re-index java types. STS plugins don't write into the index but rather ask the index to find types with main method... I wouldn't expect this to corrupt the index... (I have tried launching a few apps at once - seemed okay)

I will do that as sson as it will happen again and I will keep you updated. This happened a lot of times for us (to me and one of my colleagues)

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navy1978 avatar navy1978 commented on June 4, 2024

It has happened again and indeed deleting /.metadata/.plugins/org.eclipse.jdt.core triggered the indexing.

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