Ralf Mitschke created MDEP-483:
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             Summary: NullPointerException when using classifier and markers
                 Key: MDEP-483
                 URL: https://issues.apache.org/jira/browse/MDEP-483
             Project: Maven Dependency Plugin
          Issue Type: Bug
          Components: unpack-dependencies
    Affects Versions: 2.10
            Reporter: Ralf Mitschke
            Priority: Critical


The issue is the same as in MDEP-448 but on the unpack-dependencies goal.

It can be resolved by applying the same patch also to the file: 
org.apache.maven.plugin.dependency.fromDependencies.UnpackDependenciesMojo.java 
line 98

Note that the problem is the logging when markers are present. To  produce a 
test simply run the configuration below using any dependency with javadocs 
attachments. The first run is okay the second run fails with 
NullPointerException from 
org.apache.maven.plugin.dependency.fromDependencies.UnpackDependenciesMojo.java 
line 98

<plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-dependency-plugin</artifactId>
        <version>2.10</version>
        <executions>
                <execution>
                        <id>unpack-javadoc</id>
                        <phase>initialize</phase>
                        <goals>
                                <goal>unpack-dependencies</goal>
                        </goals>
                        <configuration>
                                <overWriteIfNewer>false</overWriteIfNewer>
                                <classifier>javadoc</classifier>
                                
<markersDirectory>${project.build.directory}/mdep-markers</markersDirectory>
                        </configuration>
                </execution>
        </executions>
</plugin>



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