The “core” category has nothing to do with what Log4j package the plugins are
in. Rather, it has to do with where they are used. For example any Appender or
Filter would be a “Core” plugin. This is because the plugin manager resolves
plugins by the group they fall into.
If you find all the usages of the PluginManager constructor you will find all
the categories:
Converter for PatternConverters,
Lookup for Lookups,
KeyProvider for the secret key provider in Flume (or anything else that
needs a secret key provided),
TypeConverter for the various type converters.
ConfigurationFactory for the various ConfigurationFactory
implementations.
Core for everything else (i.e. - anything that can appear as a root
component in a configuration as well as most of the sub-components - with the
exception of PatternConverters and KeyProviders.
Again, the reason for the categories is so that a component can use the
PluginManager to find the set of plugins that it wants to support. Thus the key
for determining how the plugins are used is by knowing what code is creating a
PluginManager.
Ralph
> On Dec 4, 2016, at 1:59 PM, Matt Sicker <[email protected]> wrote:
>
> I was under the impression that "Core" plugins were ones that followed the
> basic @PluginFactory/@PluginBuilder pattern that corresponded to an XML
> element. It's somewhat confusing honestly.
>
> On 12 November 2016 at 02:05, Gary Gregory <[email protected]
> <mailto:[email protected]>> wrote:
> I notice that we have Plugins that are NOT in log4j-core that use category =
> "Core".
>
> Is that a hack or should these be changed to category =
> "WhateverModuleILiveIn"?
>
> Gary
>
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