An internal error occurred during Updating Maven Project Unsupported IClasspathEntry kind 4

Question

As the title mentioned I have the following problem  I use Eclipse with Maven Nature and when I update my Maven Project  I get this error      An internal error occurred during   Updating Maven Project         Unsupported IClasspathEntry kind 4   The solution that always comes back is the following    rightclick project  remove maven nature mvn eclipse clean  with project open in eclipse STS   sometimes they suggest to do mvn eclipse eclipse next  rightclick project and reenable maven nature   Now I exhaustively tried all combinations several times  But I always keep getting the above error  The error starting occurring when I had to mvn eclipse eclipse the project  Before it was always running fine using only m2eclipse features and setting everything in eclipse

User · Answer

It helped in my case  rightclick project  remove maven nature mvn eclipse clean  with project open in eclipse STS  delete the project in eclipse  but do not delete the sources  Import existing Maven project

User · Answer

I just went to Properties -  Java Build Path -  Libraries and removed the blue entries starting with M2 REPO  After that  I could use Maven -  Update Project again

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I have that problem and my solution is going source folder and run command line  mvn clean install -DskipTests eclipse eclipse then return eclipse workspace and refresh project  Hope that help

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I imported the project as general project from git repository     Deleted  settings   project and   classpath in project s folder  Configure - gt  Convert to Maven Project  Only this solved the problem in my case

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Slightly different option usually works for me     mvn eclipse eclipse  for this project in the command line   Refresh F5  this project in eclipse    That s all  no need to re-import but need to have the terminal window handy

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After trying all these procedures it still didn t work for me   What did work was    go into File Explorer and delete the  classpath file under the project s root folder run Maven update within Eclipse  and check Force update of Snapshots Releases   Our current work required integrating a number of disparate projects so unfortunately use of SNAPSHOTs in a production environment were required  taboo in Maven circles

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Your command line mvn eclipse project generator may not be the same version as that of your eclipse  and eclipse doesn t understand for your command line tool is generating  Just use eclipse s in this case    remove the project from eclipse  including all modules if multi-module  run  rm -rf  settings   project  classpath to delete eclipse project files  also from modules  import your project as an existing maven project

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My tricky solution is    Open your windows Task Manager   Find the Javaw exe process and highlight it  then End it by End Process In eclipse project browser  right click it and use Maven - gt  Update Project again     Issue is resolved    If you have Tomcat Server Running in Eclipse  you need to refresh project before restart Tomcat Server

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I solved this by looking at this comment on JBIDE-11655   deleting all  project   settings and  classpath in my projects folder

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I removed my  classpath file in my project directory to correct this issue   No need to remove the Maven Nature from the project in Eclipse   The specific error I was getting was  Project  my-project-name  is missing required Java project   org some package-9 3 0  But my project wasn t dependent on org some package in any way     Perhaps an old version of the project relied on it and Maven wasn t properly updating the  classpath file

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This is all you need    Right-click on your project  select Maven -  Remove Maven Nature  Open you terminal  navgate to your project folder and run mvn eclipse clean Right click on your Project and select Configure - gt  Convert into Maven Project Right click on your Project and select Maven - gt  Update Project

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This issue  https   bugs eclipse org 394042  is fixed in m2e 1 5 0 which is available for Eclipse Kepler and Luna from this p2 repo     http   download eclipse org technology m2e releases 1 5  If you also use m2e-wtp  you ll need to install m2e-wtp 1 1 0 as well     http   download eclipse org m2e-wtp releases luna 1 1

User · Answer

I had to do it slightly different to work for me    rightclick project  remove maven nature  or in newer eclipse   Maven- Disable Maven Nature   mvn eclipse clean  with project open in eclipse STS  delete the project in eclipse  but do not delete the sources  Import existing Maven project

[eclipse] An internal error occurred during: "Updating Maven Project". Unsupported IClasspathEntry kind=4

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