maven-dependency-plugin target/classes - Access is denied

I have a multi module project with a parent project A, and two childs project B and C. Project B has a dependency on project C. I use the maven-dependency-plugin to copy the dependencies of B to a lib/ directory in the target/ directory. So, I can use the maven-assembly-plugin to include this lib/ directory in the final zip. The problem is I get the following error when I run mvn clean package on project B:

at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209) ... 19 more

Caused by: java.io.FileNotFoundException: D:\path-to-projects-directory\C\target\classes (Access is denied)

at java.io.FileInputStream.open(Native Method)

at java.io.FileInputStream.(FileInputStream.java:120)

at org.codehaus.plexus.util.io.FileInputStreamFacade.getInputStream(FileInputStreamFacade.java:36)

at org.codehaus.plexus.util.FileUtils.copyStreamToFile(FileUtils.java:1141)

at org.codehaus.plexus.util.FileUtils.copyFile(FileUtils.java:1048)

at org.apache.maven.plugin.dependency.AbstractDependencyMojo.copyFile(AbstractDependencyMojo.java:192) ... 23 more

Someone has an idea?

I've done some research on the web and I found that there is such an issue (see http://jira.codehaus.org/browse/MWAR-192 , that's for the wars but I have the similar problem with JAR). It seems that the target/classes directory of project C can't be accessed to create the C.jar (the C.jar must be included in the lib/ directory of project B).

Thanks

Solution

I just ran into this issue as well using the configuration

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-jar-plugin</artifactId>
    <version>2.3.2</version>
    <configuration>
        <archive>
            <index>true</index>
            <manifest>
                <addClasspath>true</addClasspath>
            </manifest>
            <manifestEntries>
                <mode>development</mode>
                <url>${project.url}</url>
                <key>value</key>
            </manifestEntries>
        </archive>
    </configuration>
    ...
</plugin>

provided from the manifest customization example at http://maven.apache.org/plugins/maven-jar-plugin/examples/manifest-customization.html. I diagnosed it to the <index>true</index> as the problem went away when that part was commented out, and verified that this was an issue for versions 2.3.2, 2.3.1, 2.3, 2.2, 2.1 of the maven jar plugin.

According to the maven plugin jira -- see https://jira.codehaus.org/browse/MJAR-69 -- it's just been fixed