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https://issues.apache.org/jira/browse/LOG4J2-365?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13745672#comment-13745672
]
Remko Popma commented on LOG4J2-365:
------------------------------------
Here is an example launcher that makes sure the log4j jars are in the classpath
of the child process:
{code}
package a;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
class ChildProcess {
public static void main(String[] args) throws Exception {
Logger log = LogManager.getLogger(ChildProcess.class);
log.error("Hello world!");
}
}
public class Launcher {
public static void main(String[] args) throws Exception {
ProcessBuilder pb = new ProcessBuilder( //
"java", //
"-Dlog4j.configurationFile=log4j2.xml", //
// THIS IS IMPORTANT!
// Log4j jars must be in classpath of CHILD process!
//
// One (easy) way to do this is to pass the classpath of
// the parent process to child process...
// Then start laucher with the log4j jars in the classpath.
"-cp", System.getProperty("java.class.path"), //
//
// Another way would be to set the individual jars &
directories...
//"-cp",
"lib/log4j-api-2.0-beta8.jar;lib/log4j-core-2.0-beta8.jar",
// class name of the child process
ChildProcess.class.getName()
);
pb.redirectErrorStream(true); // merge System.out and System.err
final Process process = pb.start();
final boolean[] stop = { false };
printProcessOutput(process, stop);
process.waitFor();
stop[0] = true;
}
private static Thread printProcessOutput(final Process process,
final boolean[] stop) {
Thread t = new Thread("OutputWriter") {
@Override
public void run() {
BufferedReader in = new BufferedReader(new InputStreamReader(
process.getInputStream()));
try {
String line = null;
while (!stop[0] && (line = in.readLine()) != null) {
System.out.println(line);
}
} catch (Exception ignored) {
}
}
};
t.start();
return t;
}
}
{code}
This child process logs correctly to the console. Here is the command:
{code}java -cp bin;lib/log4j-api-2.0-beta8.jar;lib/log4j-core-2.0-beta8.jar
a.Launcher{code}
I get the following output:
{code}
09:37:51.310 [main] ERROR a.ChildProcess - Hello world!
{code}
> ERROR StatusLogger Unable to locate a logging implementation, using
> SimpleLogge
> -------------------------------------------------------------------------------
>
> Key: LOG4J2-365
> URL: https://issues.apache.org/jira/browse/LOG4J2-365
> Project: Log4j 2
> Issue Type: Question
> Components: log4j 1.2 emulation
> Affects Versions: 2.0-beta7
> Environment: windows7
> Reporter: wei wang
> Priority: Blocker
> Labels: ERROR, SimpleLogge, StatusLogger, Unable, a,
> implementation,, locate, logging, to, using
> Fix For: 2.0-beta7
>
> Original Estimate: 12h
> Remaining Estimate: 12h
>
> I have problem to make the logging work with the log4j2.xml when packing
> into jar file.
> I have launcher.jar which calls oamcli.jar(has logging implementation and log
> is working in eclipse)
> How ever when I try to run :
> java -Dlog4j.configurationFile=path\to\log4j2.xml -cp "launcher.jar; lib\*"
> .....
> I got a "ERROR StatusLogger Unable to locate a logging implementation, using
> SimpleLogger"
> Please give me some advice and where to look for the answer.
> Thanks!
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