[GH-16351] Do not call System.exit from water.tools #16366
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Your fix has stopped h2o-3 cluster from crashing. I ran the following: curl http://localhost:54321/99/Rapids --data-urlencode 'ast=(run_tool "MojoConvertTool" ["", "", "", ""])' and got the following result:
From talking to @mmalohlava , he does not want to see the whole stack, just the error message which in this case is "Caused by:java.lang.IllegalArgumentException: Specified MOJO file (/Users/wendycwong/h2o-3) doesn't exist!", I took a look and think this is the file that passes everything over: RapidsHandler.java around line 38 where the whole stack errors are passed as well.
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| mainInternal(args); | ||
| } | ||
| catch (IllegalArgumentException e) { | ||
| System.err.println(e.getMessage()); |
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Please make sure this only print out the actual error message and not the whole stack.
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I ran your code again today (sept 4, 2024) but still got the following: 
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fix #16351