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From "Sangjin Lee (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-11048) user/custom LogManager fails to load if the client classloader is enabled
Date Tue, 02 Sep 2014 20:26:20 GMT
Sangjin Lee created HADOOP-11048:
------------------------------------

             Summary: user/custom LogManager fails to load if the client classloader is enabled
                 Key: HADOOP-11048
                 URL: https://issues.apache.org/jira/browse/HADOOP-11048
             Project: Hadoop Common
          Issue Type: Bug
          Components: util
    Affects Versions: 2.6.0
            Reporter: Sangjin Lee
            Assignee: Sangjin Lee


If the client classloader is enabled (HADOOP-10893) and you happen to use a user-provided
log manager via -Djava.util.logging.manager, it fails to load the custom log manager:

{noformat}
Could not load Logmanager "org.foo.LogManager"
java.lang.ClassNotFoundException: org.foo.LogManager
    at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
    at java.util.logging.LogManager$1.run(LogManager.java:191)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.util.logging.LogManager.<clinit>(LogManager.java:181)
    at java.util.logging.Logger.demandLogger(Logger.java:339)
    at java.util.logging.Logger.getLogger(Logger.java:393)
    at com.google.common.collect.MapMakerInternalMap.<clinit>(MapMakerInternalMap.java:136)
    at com.google.common.collect.MapMaker.makeCustomMap(MapMaker.java:602)
    at com.google.common.collect.Interners$CustomInterner.<init>(Interners.java:59)
    at com.google.common.collect.Interners.newWeakInterner(Interners.java:103)
    at org.apache.hadoop.util.StringInterner.<clinit>(StringInterner.java:49)
    at org.apache.hadoop.conf.Configuration.loadResource(Configuration.java:2293)
    at org.apache.hadoop.conf.Configuration.loadResources(Configuration.java:2185)
    at org.apache.hadoop.conf.Configuration.getProps(Configuration.java:2102)
    at org.apache.hadoop.conf.Configuration.get(Configuration.java:851)
    at org.apache.hadoop.util.RunJar.run(RunJar.java:179)
    at org.apache.hadoop.util.RunJar.main(RunJar.java:136)
{noformat}

This is caused because Configuration.loadResources() is invoked before the client classloader
is created and made available.



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