This has been fixed with m2eclipse-mavenarchiver 0.17.0 you can install
from
http://repo1.maven.org/maven2/.m2e/connectors/m2eclipse-mavenarchiver/0.17.0/N/LATEST/

On Thu, Feb 12, 2015 at 9:30 PM, Eric B <[email protected]> wrote:

> So I'm running into this old ugly problem of seeing this error in my build:
>
>
> org.codehaus.plexus.archiver.jar.Manifest.merge(org.codehaus.plexus.archiver.jar.Manifest)
>
>
> I've searched the web and seem to find out that this is an old problem
> that is relating to an older version of the plexus.archiver.  All solutions
> point to downgrading the jar plugin to 2.3.2.  Additionally, I see that the
> jar plugin is up to version 2.5 so I presume this issue has been resolved
> since 2.4.
>
> https://dev.eclipse.org/mhonarc/lists/m2e-users/msg02274.html
>
>
> My problem is that this is occuring in projects that are WARs and EARs.
> I'm using maven-war-plugin 2.6 and maven-ear-plugin 2.10
>
> I only noticed this error once I installed m2e-wtp.  Prior to installing
> m2e-wtp, I didn't see this problem.
>
> What can I do about this?  Is this still an archiver problem?  Is there a
> version that I can specify to avoid this error?
>
> I'm running Eclipse Juno 4.2.1 with M2e 1.4.0 and m2e-wtp 1.0.1
>
> Thanks,
>
> Eric
>
>
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