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From "Sangjin Lee (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-11831) isolated classloader does not handle packages that are split between system classpath and app classpath
Date Tue, 14 Apr 2015 16:30:12 GMT
Sangjin Lee created HADOOP-11831:
------------------------------------

             Summary: isolated classloader does not handle packages that are split between
system classpath and app classpath
                 Key: HADOOP-11831
                 URL: https://issues.apache.org/jira/browse/HADOOP-11831
             Project: Hadoop Common
          Issue Type: Bug
    Affects Versions: 2.6.0
            Reporter: Sangjin Lee
            Assignee: Sangjin Lee


We've seen a case where the isolated classloader fails if user code needs classes that are
part of the system classes package but are not included in the "system".

One example we see is class org.w3c.dom.ElementTraversal:
{noformat}
java.lang.ClassNotFoundException: org.w3c.dom.ElementTraversal
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 org.apache.hadoop.util.ApplicationClassLoader.loadClass(ApplicationClassLoader.java:202)
at org.apache.hadoop.util.ApplicationClassLoader.loadClass(ApplicationClassLoader.java:170)
... 47 more
{noformat}

The org.w3c.dom package is included in the system class packages as it is provided by the
JDK itself. However, this particular class (ElementTraversal) does not exist in the JDK. In
this case, it was included in a Xerces library the user brought. However, since the package
is declared as system classes, the application classloader will not look at the app classpath
to locate this class.



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