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HADOOP-10288. Explicit reference to Log4JLogger breaks non-log4j users. Contributed by Todd Lipcon. 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1561880 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Todd Lipcon 2014-01-27 22:13:51 +00:00
parent 9b4403eba9
commit 497eb4b402
2 changed files with 14 additions and 1 deletions
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3
hadoop-common-project/hadoop-common/CHANGES.txt
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@ -246,6 +246,9 @@ Release 2.4.0 - UNRELEASED
HADOOP-10250. VersionUtil returns wrong value when comparing two versions.
(Yongjun Zhang via atm)
HADOOP-10288. Explicit reference to Log4JLogger breaks non-log4j users
(todd)
Release 2.3.0 - UNRELEASED
INCOMPATIBLE CHANGES

12
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/http/HttpRequestLog.java
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@ -53,7 +53,17 @@ public class HttpRequestLog {
String appenderName = name + "requestlog";
Log logger = LogFactory.getLog(loggerName);
if (logger instanceof Log4JLogger) {
boolean isLog4JLogger;;
try {
isLog4JLogger = logger instanceof Log4JLogger;
} catch (NoClassDefFoundError err) {
// In some dependent projects, log4j may not even be on the classpath at
// runtime, in which case the above instanceof check will throw
// NoClassDefFoundError.
LOG.debug("Could not load Log4JLogger class", err);
isLog4JLogger = false;
}
if (isLog4JLogger) {
Log4JLogger httpLog4JLog = (Log4JLogger)logger;
Logger httpLogger = httpLog4JLog.getLogger();
Appender appender = null;