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Debugging
Debugging a shell application is theoretically same as debugging any other jvm process, however the shell part of it will complicate things as IDE’s have different type of support running a proper command-line applications.
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VSCode probably has a best support as you can directly start a shell in a debug mode directly within IDE.
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STS/Eclipse contains some sort of a support running a shell but it’s implementation is missing most of a modern shell capabilities.
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IDEA is currently probably a worst one as in a debug mode it seems to connect directly to jvm input/output streams and fully misses shell capabilities.
If you’re unable to directly launch shell application in a debug mode within IDE, one workaround is to use your favourite shell and start jvm process with a debug mode:
java -agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=127.0.0.1:8000 -jar target/demo-0.0.1-SNAPSHOT.jarAnd then connect your IDE to it as an external debug target.