I am quit new to maven, I have seen this problem and I fixed it via:

In command line for each project folder (which contains pom):
mvn eclipse:clean

And then
mvn eclipse:eclipse

This will remove old project files and install new.

Regards
Shumail

On Wed, Nov 21, 2012 at 2:32 PM, Matthew Piggott <[email protected]>wrote:

> You should also be able to use the 'Convert to Maven Project' on the
> context menus or simply remove the projects from the workspace and use one
> of the Maven import wizards.
>
>
>
> On 21 November 2012 09:22, Marc Pasteur <[email protected]> wrote:
>
>> look at your .classpath file.
>> If there is some "org.maven.ide.eclipse" things then :
>>    * delete your project from your workspace
>>    * delete .classpath, .project files and .settings folder
>>    * reimport your project in eclipse
>>
>> regards
>>
>>
>> 2012/11/21 Anders Hammar <[email protected]>
>>
>>> You were re-using a Maven project on disk? So there was probably old
>>> Eclipse project files there which you need to remove.
>>>
>>> /Anders
>>>
>>>
>>>
>>> On Wed, Nov 21, 2012 at 1:27 PM, Kristian Lind <[email protected]>wrote:
>>>
>>>> U created a fresh one. Only the project is reused.
>>>>
>>>> On Wed, Nov 21, 2012 at 1:25 PM, Anders Hammar <[email protected]>wrote:
>>>>
>>>>> Did you use a fresh workspace or re-used the old one? m2e 1.x is not
>>>>> compatible with Eclipse project config files created by m2e 0.x.
>>>>>
>>>>> /Anders
>>>>>
>>>>>
>>>>> On Wed, Nov 21, 2012 at 1:17 PM, Kristian Lind <[email protected]>wrote:
>>>>>
>>>>>> Updated eclipse from Indigo to Juno.
>>>>>>
>>>>>> In Indigo there was Maven plugin
>>>>>> Maven Integration for Eclipse (Required) 0.12.1.20110112-1712
>>>>>> org.maven.ide.eclipse.feature.feature.group Sonatype, Inc.
>>>>>>
>>>>>> Installed Maven plugin in Juno
>>>>>> m2e - Maven Integration for Eclipse 1.2.0.20120903-1050
>>>>>> org.eclipse.m2e.feature.feature.group Eclipse.org - m2e
>>>>>>
>>>>>> Imported project that was used in Indigo.
>>>>>>
>>>>>> Maven dependencies is no longer on classpath, hence project cannot
>>>>>> compile.
>>>>>>
>>>>>> Any suggestions ??
>>>>>>
>>>>>> _______________________________________________
>>>>>> m2e-users mailing list
>>>>>> [email protected]
>>>>>> https://dev.eclipse.org/mailman/listinfo/m2e-users
>>>>>>
>>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> m2e-users mailing list
>>>>> [email protected]
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>>>>>
>>>>>
>>>>
>>>>
>>>> --
>>>> Med venlig hilsen / Best regards
>>>>
>>>> Kristian Lind
>>>>
>>>>
>>>> _______________________________________________
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>>>>
>>>>
>>>
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>>>
>>
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>>
>
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