Unable to disable generation of sources JAR with maven-release-plugin - maven-2

Question

I am trying to release a web project using Maven 2.2.1 and the maven-release-plugin 2.0-beta-9, but it always fails when doing release:perform on generating the sources jar for the EAR project, which makes sense since the EAR project doesn't have any source.
[INFO] [INFO] [source:jar {execution: attach-sources}]
[INFO] [INFO] ------------------------------------------------------------------------
[INFO] [ERROR] BUILD ERROR
[INFO] [INFO] ------------------------------------------------------------------------
[INFO] [INFO] Error creating source archive: You must set at least one file.
To try to disable the building of a sources JAR for the EAR project, I added the following to the POM for my EAR project (the version of the release plugin is set in a parent POM):
<build>
<plugins>
...
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-release-plugin</artifactId>
<configuration>
<useReleaseProfile>false</useReleaseProfile>
</configuration>
</plugin>
</plugins>
</build>
Upon running the release again after checking in this change, I got the same error while generating the sources JAR for the EAR project, even though this should have been disabled by the previous POM snippet.
What am I doing wrong? Why is the sources JAR still being built?
Edit:
I've tried to make the source plugin include my application.xml file so that this error doesn't occur by adding the following POM snippet:
<build>
<plugins>
...
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-source-plugin</artifactId>
<configuration>
<includes>
<include>${basedir}/META-INF/**/*</include>
</includes>
<useDefaultExcludes>false</useDefaultExcludes>
</configuration>
</plugin>
</plugins>
</build>
Unfortunately, this does not fix the problem either.

Answer 1

I finally figured it out. I needed to add my source files as part of the references:
<resources>
<resource>
<directory>${project.basedir}</directory>
<includes>
<include>META-INF/**/*</include>
</includes>
<excludes>
<exclude>target/**/*</exclude>
<exclude>bin/**/*</exclude>
<exclude>META-INF/.svn/**/*</exclude>
</excludes>
</resource>
</resources>
Doing this made everything work again. I didn't need any special configuration for the release or source plugins to get it to work.

Answer 2

There was a bug in the maven-source-plugin version 2.1 that resulted in the same error as you describe here. Newer Version >= 2.1.1 contain the fix. Here is a link to this Bug for further information. http://jira.codehaus.org/browse/MSOURCES-44