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

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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.

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());

Correct way to System.setErr() for multiple threads?, The following SSCCE does exactly what you want and are expecting: public class App { public static void main(String[] args) throws� When I started to add multithreading I did a little research and came across this SO question: In a multithreaded Java program, does each thread have its own copy of System.out?, which implied that I should do System.setErr() once before firing up my thread pool and I'd be all set. Only that doesn't appear to be the case. My code looks like

The ConsoleHandler captures a reference to System.err during construction. Another solution is to replace all ConsoleHandler in the log tree.

    LogManager m = LogManager.getLogManager();
    synchronized (m) {
        Enumeration<String> names = m.getLoggerNames();
        while (names.hasMoreElements()) {
            Logger logger = m.getLogger(names.nextElement());
            if (logger != null) {
                for (Handler h : logger.getHandlers()) {
                    if (h.getClass() == ConsoleHandler.class) {
                        logger.removeHandler(h);
                        h.close();
                        logger.addHandler(new ConsoleHandler());
                    }
                }
            }
        }
    }

Java System setErr() Method, The setErr() method of Java System class is used to reassign the "standard" manager exists and its checkPermission method doesn't allow reassigning of the � Java System setErr() Method. This exception will throw if the security manager exists and its checkPermission method doesn't allow reassigning of the standard

System.err.println("This is written to stderr");

// this is stderr
PrintStream oldErr = System.err;

try {
    System.setErr(new PrintStream(new File("/path/to/file")));
} catch(Exception e) {
}


System.err.println("This is written to the file");

// note that System.err wouldn't work here because System.err is no longer stderr
// but you preserved stderr in oldErr
try {
    System.setErr(oldErr);
} catch(Exception e) {
}

System.err.println("This is written to stderr again");

java.lang.System.setErr java code examples, private static void redirectStdOutAndErr() { try { PrintStream out = new PrintStream(new FileOutputStream(getOutFile(), true), true); System.setErr(out); System. 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,

Java - System.setErr() Examples, Java - System.setErr() Examples. Java Java API � Previous MethodNext Method� Output retrieving error from byte stream-- error -- java.lang.ArithmeticException: / by zero at com.logicbig.example.system.SetErrExample.main(SetErrExample.java:20

Java System.in, System.out, and System.error, Java has 3 streams called System.in, System.out, and System.err which are Keyboard input for other applications cannot be read via System.in . use one of th emethods System.setIn() , System.setOut() or System.setErr() . Re: System.setOut() and System.setErr() 807556 Sep 21, 2001 2:21 AM ( in response to 807556 ) Hi Delfina, Please pardon the sexism.

System (Java Platform SE 7 ), The System class contains several useful class fields and methods. code for the given object as would be returned by the default method hashCode(), and its checkPermission method doesn't allow reassigning of the standard output stream. setErr. public static void setErr(PrintStream err). Reassigns the " standard"� SecurityException - if a security manager exists and its checkPropertyAccess method doesn't allow access to the specified system property. NullPointerException - if key is null. IllegalArgumentException - if key is empty. Since: 1.5 See Also: