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javaloggingstderrjava.util.logging

System.setErr() doesn't restore console logging after stderr closed

My app uses System.setErr() to change stderr to a stream which will eventually be closed. Immediately after it's closed I immediately use System.setErr() again to change stderr to a working stream, which goes fine for when my code does something like System.err.println(), but logging with java.util.logging to the console (that is, to stderr) no longer works.

Solution

  • To solve this, I had to re-read the logging configuration file and then put back in the console logging handler myself:

    import java.util.logging.ConsoleHandler;
import java.util.logging.Loggger;
import java.util.logging.LogManager;

...

System.setErr(otherStream);

try {
    LogManager.getLogManager().readConfiguration();
}
catch(java.io.IOException e) {
    // ...
}

Logger.getGlobal().addHandler(new ConsoleHandler());