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http://jira.codehaus.org/browse/MFINDBUGS-142?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=265374#action_265374
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Dennis Lundberg commented on MFINDBUGS-142:
-------------------------------------------
Using a plugin dependency is prefered over using extensions. Extensions for
this use case might not work in future versions of Maven.
As for the new error, I'm afraid I don't know how to help you with that.
> Findbugs plugins from the classpath do not work
> -----------------------------------------------
>
> Key: MFINDBUGS-142
> URL: http://jira.codehaus.org/browse/MFINDBUGS-142
> Project: Maven 2.x FindBugs Plugin
> Issue Type: Bug
> Affects Versions: 2.3.2
> Reporter: Thomas Traber
>
> If a Findbugs plugin on the classpath is specified using the pluginList
> parameter of the Maven Findbugs plugin, then this plugin (it is a JAR file)
> is copied into the target directory incorrectly and will not be processed by
> findbugs.
> Some analysis:
> Plugins are made accessible to Findbugs by the FindBugsMojo as File by the
> getResourceFile(String) method, which calls the ResourceManager method
> getResourceAsFile(String, String). Everthing probably works fine if the
> plugin is specified by a file name, but if the name is actually refering to a
> classpath resource, then the DefaultResourceManager.getResourceAsFile(String,
> String) method copies the resource with Readers and Writers which is of
> course a bad idea for binary data. As a result the copied JAR file is not
> readable by Findbugs and the plugin does not get processed.
> I consider the possibility to specify the Findbugs plugins by a classpath
> resource very important, since it is the best way to share the plugin in
> several projects. The following snippets may help to see the principle idea:
> {code:xml|title=pom.xml}
> ...
> <build>
> <extensions>
> <!-- This makes the Findbugs plugin fb-contrib-*.jar available to the
> maven-findbugs-plugin on the classpath. -->
> <extension>
> <groupId>com.mycompany</groupId>
> <artifactId>maven-java-tools</artifactId>
> <version>1.0.0</version>
> </extension>
> </extensions>
> ....
> <plugin>
> <groupId>org.codehaus.mojo</groupId>
> <artifactId>findbugs-maven-plugin</artifactId>
> <version>${findbugs-maven-plugin.version}</version>
> <configuration>
> <threshold>Low</threshold>
> <effort>Max</effort>
>
> <pluginList>com/mycompany/java/tools/findbugs/fb-contrib-4.6.0.jar</pluginList>
> </configuration>
> </plugin>{code}
> PS: It would be nice to have the possibilities of the pluginList entries a
> bit better documented in the site documentation.
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