[logback-dev] [JIRA] Resolved: (LBCLASSIC-263) Logback Classic causes SecurityException

Ceki Gulcu (JIRA) noreply-jira at qos.ch
Thu Sep 8 23:02:16 CEST 2011

     [ http://jira.qos.ch/browse/LBCLASSIC-263?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ceki Gulcu resolved LBCLASSIC-263.

    Resolution: Won't Fix

I've added a new method getClassLoaderAsPrivileged in the ch.qos.logback.core.util.Loader class which was changed as follows:

package ch.qos.logback.core.util;

public class Loader {

 private static boolean HAS_GET_CLASS_LOADER_PERMISSION = false;
  static {
            AccessController.doPrivileged(new PrivilegedAction<Boolean>() {
              public Boolean run() {
                try {
                          new RuntimePermission("getClassLoader"));
                  return true;
                } catch (AccessControlException e) {
                  return false;

  public static ClassLoader getClassLoaderAsPrivileged(final Class clazz) {
      return null;
      return AccessController.doPrivileged(
              new PrivilegedAction<ClassLoader>() {
                public ClassLoader run() {
                  return clazz.getClassLoader();

The changed were committed in [1].

However, I did not change PackagingDataCalculator to use Loader#getClassLoaderAsPrivileged due to performance reasons. Collecting packaging data is already rather expensive and I do not wish to add to the cost. You have two options:

1) make the single line change yourself
2) add %ex at the end of your conversion patterns. This will avoid using the default %xEx. See [2] for documentation.

[1] http://github.com/ceki/logback/commit/75da45d0f69
[2] http://logback.qos.ch/manual/layouts.html#xThrowable

> Logback Classic causes SecurityException
> ----------------------------------------
>                 Key: LBCLASSIC-263
>                 URL: http://jira.qos.ch/browse/LBCLASSIC-263
>             Project: logback-classic
>          Issue Type: Bug
>    Affects Versions: 0.9.28
>            Reporter: NC
>            Assignee: Logback dev list
>         Attachments: PackagingDataCalculator.diff
> PackagingDataCalculator invokes Class.getClassLoader().  This method throws a SecurityException when running under a security manager and that manager denies access to the ClassLoader.
> I'm submitting a PackagingDataCalculator patch which wraps the getClassLoader() invocation in a doPrivileged block.  This allows these calls to succeed when the getClassLoader RuntimePermission is granted to logback-classic.

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