System.out.println and System.err.println out of order

Question

My System.out.println() and System.err.println() calls aren\'t being printed to the console in the order I make them.

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Answer 1

In Eclipse specifically, you now have, with Eclipse 2019-09 synchronized standard and error output in console.

The Eclipse Console view currently can not ensure that mixed standard and error output is shown in the same order as it is produced by the running process.

For Java applications the launch configuration Common Tab now provides an option to merge standard and error output.
This ensures that standard and error output is shown in the same order it was produced but at the same time disables the individual coloring of error output.