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Editorial Team
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Asked: 2026-06-06T22:51:54+00:00

System.err.println() in Eclipse doesn’t print in red. I checked preferences > Run/Debug > console

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System.err.println() in Eclipse doesn’t print in red.

I checked preferences > Run/Debug > console and

  • “Standard Error text color” is red and
  • “show when program writes to standard error” is checked.

any Idea why shouldn’t Eclipse print in red?

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1 Answer

  1. Editorial Team

    From what I can see this seems to be a bug that has been fixed in Tomcat 7 and onwards. I’m not sure if this is what causing it, but it might be:

    Redirection of System.out and System.err in
    org.apache.catalina.startup.Catalina.start() prevents any other
    application (for instance an IDE) from redirecting System.out and
    System.err. It also redirects them to the same output (the standard
    system output stream) preventing any differentiation of the two
    streams.

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