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https://issues.apache.org/jira/browse/LOG4J2-745?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14133482#comment-14133482
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Scott Harrington commented on LOG4J2-745:
-----------------------------------------
I pulled master and 'mvn clean install site' fails with the following:
{noformat}
[ERROR] Failed to execute goal
org.apache.maven.plugins:maven-site-plugin:3.0:site (default-site) on project
log4j-jul: Template file
'/home/scotth/logging-log4j2/log4j-jul/src/site/site.vm' does not exist ->
[Help 1]
{noformat}
I am not an expert with git, did I miss something? Or should I just skip the
'mvn site' goal for now.
> Plugins can cause ConverterKeys collisions with unpredictable results
> ---------------------------------------------------------------------
>
> Key: LOG4J2-745
> URL: https://issues.apache.org/jira/browse/LOG4J2-745
> Project: Log4j 2
> Issue Type: Improvement
> Components: Plugins
> Affects Versions: 2.0.2
> Reporter: Scott Harrington
> Assignee: Matt Sicker
> Priority: Blocker
> Fix For: 2.1
>
> Attachments: LOG4J2-745-patch-r1617171.txt, Safer_PluginManager.patch
>
>
> If I create a Converter plugin with ConverterKeys of "d" or "m" then there
> will be a collision with the built-in DatePatternConverter or
> MessagePatternConverter.
> It is unpredictable which plugin gets used.
> I see two resolutions:
> (1) detect collisions in PatternParser and emit a warning so we know which
> implementation will be used
> (2) use whichever Log4j2Plugins.dat appeared first in the CLASSPATH
> Predictable iteration order is usually accomplished by replacing HashMaps
> with LinkedHashMaps. Could easily do this for thie PluginManager.plugins
> field. But PluginRegistry uses a ConcurrentHashMap.
> Is there a good reason to use ConcurrentHashMaps in PluginRegistry? It
> doesn't really give you any concurrency -- a caller to
> PluginManager.getPlugins could see a partially-loaded map if collectPlugins
> was still running. Why not synchronize collectPlugins and/or loadPlugins, and
> force any concurrent caller to getPlugins to wait until the loading was
> complete.
> I would give it a stab but I see other more important changes are probably
> underway for LOG4J2-741 and LOG4J2-673 and this can probably wait.
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