One JVM with different system.out / system.err files

Question

I have a menu application which allows me to launch different swingapps which runs inside one single JVM.
All applications have their own properties.file which is read and handled at the start of each application.
One property allows me to print all kind of system.err / system.out which i want to redirect to a specific file. This is implemented with following code:
        if (isTRACE_ENABLED()){
            try {
                setTrace_out_log(new PrintStream(
                          new BufferedOutputStream(
                                new FileOutputStream(props.getProperty("TRACE_OUTLOG_FILE")),128), true));
                System.setOut(getTrace_out_log());
                setTrace_err_log(new PrintStream(
                        new BufferedOutputStream(
                              new FileOutputStream(props.getProperty("TRACE_ERRLOG_FILE")),128), true));
                System.setErr(getTrace_err_log());
            } catch(IOException e) {
                e.printStackTrace();
        }This works file but... all system.out and system.err is redirected to same file... which is not what i want.
Example:
debug property for menu application = enabled
debug property for app 1 = disabled
debug property for app 2 = enabled
In above case i want to have 4 new files:
- menuapp_out
- menuapp_err
- app2_out
- app2_err
This doesn't work, the files are created but after starting app2, the print-statements for the menu application are alse redirected to the app_2_xxx files. And when i finish app2, i do not get any print-output anymore
IMHO this is because the JVM only has 1 system.out and 1 system.err file. Is there some way to solve this?

Answer 1

I understand that i need to use java.util.logger (JUL) or Log4j
Are there any (free) tools availabe to read/analyze the logfiles created by above tools?