Maven GPG plugin not signing sources and javadoc jars

Question

I'm attempting to release my project's artifacts to Sonatype using Maven. I'm using the Maven GPG plugin to sign the artifacts, but it's not signing the sources and javadoc jars (just the main jar), which is required by Sonatype. Here's what I think are the relevant parts of my pom.xml:

<plugins>
    ...
    <plugin>
        <artifactId>maven-source-plugin</artifactId>
            <executions>
                <execution>
                    <id>attach-sources</id>
                    <phase>install</phase>
                    <goals>
                        <goal>jar-no-fork</goal>
                    </goals>
                </execution>
            </executions>
    </plugin>
    <plugin>
        <artifactId>maven-javadoc-plugin</artifactId>
        <executions>
            <execution>
                <id>attach-javadocs</id>
                <phase>install</phase>
                <goals>
                    <goal>jar</goal>
                </goals>
                </execution>
        </executions>
    </plugin>
    <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-gpg-plugin</artifactId>
        <executions>
            <execution>
                <id>sign-artifacts</id>
                <phase>verify</phase>
                <goals>
                    <goal>sign</goal>
                </goals>
            </execution>
        </executions>
    </plugin>
    ...
</plugins>

Is there any way to tell it to sign these others jars too?

Answer 1

These changes to the pom solved the problem:

<plugins>
    ...
    <plugin>
        <artifactId>maven-source-plugin</artifactId>
            <executions>
                <execution>
                    <id>attach-sources</id>
                    <goals>
                        <goal>jar</goal>
                    </goals>
                </execution>
            </executions>
    </plugin>
    <plugin>
        <artifactId>maven-javadoc-plugin</artifactId>
        <executions>
            <execution>
                <id>attach-javadocs</id>
                <goals>
                    <goal>jar</goal>
                </goals>
                </execution>
        </executions>
    </plugin>
    <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-gpg-plugin</artifactId>
        <version>1.4</version>
        <executions>
            <execution>
                <id>sign-artifacts</id>
                <phase>verify</phase>
                <goals>
                    <goal>sign</goal>
                </goals>
            </execution>
        </executions>
    </plugin>
    ...
</plugins>