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Do not replace System.err during Slf4JLoggerFactory construction

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Motivation:

Replacing System.err during Slf4JLoggerFactory construction is problematic as another class may optain the System.err reference before we set it back to the original value.

Modifications:

Remove code that temporary replaced System.err.

Result:

Fixes [#6212].
This commit is contained in:
Norman Maurer 2017-01-19 19:28:01 +01:00
parent cf8e07f62f
commit 71efb0b39e
1 changed files with 3 additions and 29 deletions
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32
common/src/main/java/io/netty/util/internal/logging/Slf4JLoggerFactory.java
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@ -19,16 +19,13 @@ package io.netty.util.internal.logging;
import org.slf4j.LoggerFactory;
import org.slf4j.helpers.NOPLoggerFactory;
import java.io.OutputStream;
import java.io.PrintStream;
import java.io.UnsupportedEncodingException;
/**
* Logger factory which creates a <a href="http://www.slf4j.org/">SLF4J</a>
* logger.
*/
public class Slf4JLoggerFactory extends InternalLoggerFactory {
@SuppressWarnings("deprecation")
public static final InternalLoggerFactory INSTANCE = new Slf4JLoggerFactory();
/**
@ -40,31 +37,8 @@ public class Slf4JLoggerFactory extends InternalLoggerFactory {
Slf4JLoggerFactory(boolean failIfNOP) {
assert failIfNOP; // Should be always called with true.
// SFL4J writes it error messages to System.err. Capture them so that the user does not see such a message on
// the console during automatic detection.
final StringBuffer buf = new StringBuffer();
final PrintStream err = System.err;
try {
System.setErr(new PrintStream(new OutputStream() {
@Override
public void write(int b) {
buf.append((char) b);
}
}, true, "US-ASCII"));
} catch (UnsupportedEncodingException e) {
throw new Error(e);
}
try {
if (LoggerFactory.getILoggerFactory() instanceof NOPLoggerFactory) {
throw new NoClassDefFoundError(buf.toString());
} else {
err.print(buf);
err.flush();
}
} finally {
System.setErr(err);
if (LoggerFactory.getILoggerFactory() instanceof NOPLoggerFactory) {
throw new NoClassDefFoundError("NOPLoggerFactory not supported");
}
}