Unable to add custom manifest entries to war file via the pom.xml
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         Key: MWAR-57
         URL: http://jira.codehaus.org/browse/MWAR-57
     Project: Maven 2.x War Plugin
        Type: Bug

    Versions: 2.0.1    
 Environment: Windows XP SP2
Sun JDK 1.5.0_07
Maven 2.0.4
    Reporter: Mark Reynolds


Configure custom manifest entries as in 
http://maven.apache.org/guides/mini/guide-manifest.html:
            <plugin>
                <artifactId>maven-war-plugin</artifactId>
                <version>2.0.1</version>
                <configuration>
                    <archive>
                        <manifestEntries>
                            <mode>development</mode>
                            <url>${pom.url}</url>
                        </manifestEntries>
                    </archive>
                </configuration>
            </plugin>

Get error in build:

[INFO] ------------------------------------------------------------------------
[ERROR] BUILD ERROR
[INFO] ------------------------------------------------------------------------
[INFO] Error assembling WAR

Embedded error: The attribute "mode" may not occur more than once in the same 
section
[INFO] ------------------------------------------------------------------------
[INFO] Trace
org.apache.maven.lifecycle.LifecycleExecutionException: Error assembling WAR
        at 
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:559)
        at 
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalWithLifecycle(DefaultLifecycleExecutor.java:475)
        at 
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:454)
        at 
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:306)

        at 
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:273)
        at 
org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:140)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:322)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:115)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:256)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
        at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
        at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
        at org.codehaus.classworlds.Launcher.main(Launcher.java:375)
Caused by: org.apache.maven.plugin.MojoExecutionException: Error assembling WAR
        at org.apache.maven.plugin.war.WarMojo.execute(WarMojo.java:135)
        at 
org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:412)
        at 
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:534)
        ... 16 more
Caused by: org.codehaus.plexus.archiver.jar.ManifestException: The attribute 
"mode" may not occur more than once in the same section
        at 
org.codehaus.plexus.archiver.jar.Manifest$Section.addAttributeAndCheck(Manifest.java:727)
        at 
org.codehaus.plexus.archiver.jar.Manifest$Section.addConfiguredAttribute(Manifest.java:658)
        at 
org.codehaus.plexus.archiver.jar.Manifest.addConfiguredAttribute(Manifest.java:1000)
        at 
org.apache.maven.archiver.MavenArchiver.createArchive(MavenArchiver.java:354)
        at 
org.apache.maven.plugin.war.WarMojo.performPackaging(WarMojo.java:177)
        at org.apache.maven.plugin.war.WarMojo.execute(WarMojo.java:127)
        ... 18 more

The same duplicate attribute exception occurs regardless of the name of the 
manifest entry.
Works OK in 2.0.

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