Message12169

I've wrapped the whole final part of the launcher to catch OSError, so now I get (on stderr):

PS jython-trunk> python .\dist\bin\jython.py -c "print 42"
Failed to launch Jython using command c:\foo\bin\java ...
    Use the --print option to see the command in full.
    Launcher used JAVA_HOME = c:\foo
[Error 2] The system cannot find the file specified

and non-zero exit status. Undefining TEMP does not seem to upset Jython. If you define JAVA_HOME sensibly, and undefine PATH, it runs, and if both are blank you get:

PS jython-trunk> $env:JAVA_HOME=""
PS jython-trunk> $env:Path=""
PS jython-trunk> C:\Python\2.7.15\python.exe .\dist\bin\jython.py -c "print 42"
Failed to launch Jython using command java ...
    Use the --print option to see the command in full.
    Check PATH for java command.
[Error 2] The system cannot find the file specified

This ought to be clear enough. I have still to compile this to an exe for check-in.