[jira] [Updated] (LOG4J2-834) NoClassDefFoundError in ThrowableProxy

["Thiago Kronig (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LOG4J2-834?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Thiago Kronig updated LOG4J2-834:
---------------------------------
    Attachment: 0001-LOG4J2-834-Ignores-NoClassDefFoundError-and-other-Th.patch

Hi. I encountered this bug this morning and cooked-up this patch, with a test case built-in.

> NoClassDefFoundError in ThrowableProxy
> --------------------------------------
>
>                 Key: LOG4J2-834
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-834
>             Project: Log4j 2
>          Issue Type: Bug
>            Reporter: Nikita Koval
>         Attachments: 0001-LOG4J2-834-Ignores-NoClassDefFoundError-and-other-Th.patch
>
>
> In method *loadClass* we expect {{ClassNotFoundException}}. But if class comes from another java machine we can get {{NoClassDefFoundError}}.
> Possible fix:
> {code:java}
> private Class<?> loadClass(final ClassLoader lastLoader, final String className) {
>        // XXX: this is overly complicated
>        Class<?> clazz;
>        if (lastLoader != null) {
>            try {
>                clazz = Loader.initializeClass(className, lastLoader);
>                if (clazz != null) {
>                    return clazz;
>                }
>            } catch (final Throwable ignore) {
>                // Ignore exception.
>            }
>        }
>        try {
>            clazz = Loader.loadClass(className);
>        } catch (final ClassNotFoundException | LinkageError ignored) {
>            try {
>                clazz = Loader.initializeClass(className, this.getClass().getClassLoader());
>            } catch (final ClassNotFoundException | LinkageError ignore) {
>                return null;
>            }
>        }
>        return clazz;
>    }
> {code}



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