An internal error occurred during Updating Maven Project java lang NullPointerException

Question

I m developing a Java EE web project  When I try to add a dependency  this error message appears  I use Eclipse Kepler      An internal error occurred during   Updating Maven Project   java lang NullPointerException   Could you help me  Thank you

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The root issue in my case was a file conflict in the  settings folder   So  deleting the  settings folder would have resolved the Maven error  but I wanted to keep some of my local configuration files   I resolved the conflict  then tried a Maven update again and it worked

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I encountered this same symptom and none of the solutions above were helpful  I finally got a stack trace of the problem by importing the ear project again to eclipse  and was able to trace this down to the org eclipse m2e wtp MavenDeploymentDescriptorManagement which was trying to delete a directory in windows  temp directory called   mavenDeploymentDescriptorManagement   which caused an irrational NullPointerException from the java io File exists   method  particularly because the code already had successfully done the same thing in a previous method with the same variable  then called file isFile   without problem    Checking this out on the file system revealed that the file could only be accessed with administrator privileges  Apparently I had at some point launched eclipse from an administrator console by mistake  In the end I just made hidden files visible in windows explorer and deleted the temporary file manually  which solved the problem

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I solved mine by deleting the  settings folder and  project file in the project and then reimporting the project

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This helped me  Project menu - gt  Clean    - gt  clean all projects

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In my case  the problem was a conflict of derived dependencies that were been used by other dependencies  and some of those derived dependencies versions were not available  maybe because some deploy that i forgot to do because with workspace resolution everything worked  but when moving to other environment all broke suddenly  And also I was working with version ranges  maven was giving me this error      Could not resolve dependencies for project   MyProject MyProject jar 1 0 0  Could not resolve version conflict   among Dependency-A 1 0 1 -  Dependency-B 1 1 0 -    Dependency-C 1 0 0  Dependency-X 1 0 1 -  Dependency-Y 1 1 0 -  Dependency-C 1 0 0  Dependency-I 1 0 1 -  Dependency-J 1 1 0 -  Dependency-C 1 0 0   I tried all above and nothing worked  so        THE SOLUTION  Use LATEST as version in all dependencies  so maven don t need to resolve all dependencies in ranges  wich must be used   with care because if you miss to deploy one of the dependencies the   build will fail   Only I suggest you to use LATEST if you are working with your own dependencies  otherwise in some third party future version  you could find some compilation or runtime errors

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I had the same issue     solution at the end    here the eclipse log   java lang NullPointerException     at com google appengine eclipse wtp maven GaeRuntimeManager getGaeRuntime GaeRuntimeManager java 85      at com google appengine eclipse wtp maven GaeRuntimeManager ensureGaeRuntimeWithSdk GaeRuntimeManager java 55      at com google appengine eclipse wtp maven GaeFacetManager addGaeFacet GaeFacetManager java 59      at com google appengine eclipse wtp maven GaeProjectConfigurator configure GaeProjectConfigurator java 46        it comes from  appengine maven wtp plugin  that try to get the type of GAE runtime  but seems to be null here      getRuntimeType   --  NPE    see class com google appengine eclipse wtp maven GaeRuntimeManager java    private static IRuntime getGaeRuntime String sdkVersion        IRuntime   runtimes   ServerCore getRuntimes        for  IRuntime runtime   runtimes          if  runtime    null  amp  amp     runtime getRuntimeType     equals GAE RUNTIME TYPE       So  if you check in eclipse  Google App Engine is visible   but when you select it you ll see that no SDK is associated       SOLUTION  in red on the screenshot  -

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In case it helps anyone  in addition to deleting  settings and  project  I had to delete  classpath and  factorypath before being able to import the project successfully into Eclipse

User · Answer

None of the above methods worked for me  This might also arise due to the presence of circular dependency in your eclipse workspace  So if there are any other errors present in any of the other projects in your workspace  try to fix those and then this issue will be gone  This is how i eliminated the error

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Above solutions did not work for me as the issue with open JDK 13 version https   github com spotify dockerfile-maven issues 163 So I degraded to open JDK8 and it works for me

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Eclipse has an error log  There you will see the complete stack trace  In my case it seems to be caused by a bad jar file combined with the java util zip libs not throwing a proper exception  just a NullPointerException

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In our instance of this problem  we had pom xml files where the m2e-specific life cycle mapping configuration   lt pluginManagement gt       lt plugins gt           lt plugin gt               lt groupId gt org eclipse m2e lt  groupId gt               lt artifactId gt lifecycle-mapping lt  artifactId gt               lt version gt 1 0 0 lt  version gt               lt configuration gt                   lt lifecycleMappingMetadata gt        did not have the  lt version gt 1 0 0 lt  version gt  part   When doing a Maven -  Update Project     this causes the reported NullPointerException without a stack trace   When using a fresh Import    -  Existing Maven Projects  the same exception occurred  but with a stack trace that led me to find the above    This is with m2e 1 6 1 20150625-2338 in Eclipse Luna Service Release 2  4 4 2

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Just another possible source of the problem    I found out that in my case it was the following resource block that caused it    lt project gt       lt build gt           lt resources gt               lt resource gt                   lt directory gt   basedir     some-folder lt  directory gt                   lt targetPath gt outputFolder lt  targetPath gt               lt  resource gt           lt resources gt       lt  build gt   lt  project gt    It included a folder from the project folder  the eclipse project is a subfolder of the versioned project folder     In my case  I could remove the error by removing the block and replacing it with a call to the Build helper Maven plugin    lt build gt       lt plugins gt           lt plugin gt               lt groupId gt org codehaus mojo lt  groupId gt               lt artifactId gt build-helper-maven-plugin lt  artifactId gt               lt version gt 1 9 1 lt  version gt               lt executions gt                   lt execution gt                       lt id gt my-own-very-cool-id-for-this-step lt  id gt                       lt phase gt generate-resources lt  phase gt                       lt goals gt                           lt goal gt add-resource lt  goal gt                       lt  goals gt                       lt configuration gt                           lt resources gt                               lt resource gt                                   lt directory gt   basedir     some-folder lt  directory gt                                   lt targetPath gt outputFolder lt  targetPath gt                               lt  resource gt                           lt  resources gt                       lt  configuration gt                   lt  execution gt               lt  executions gt           lt  plugin gt       lt  plugins gt   lt  build gt

User · Answer

org eclipse m2e core prefs file is in  settings folder  If you face the problem of   An internal error occurred during   Updating Maven Project   java lang NullPointerException  Delete the project from eclipse then by deleting the  settings folder  amp   project file in the project -  then re-import the project

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I had this same issue across multiple projects and multiple workspaces  none of the solutions I found online worked for me  I m using STS and the only thing that worked was to go into my STS directory and add a  -clean  to the top of the STS ini file  You can then start up your workspace and run maven clean without errors   you can also remove the -clean tag from the ini file so it doesn t clean everytime you start it   Hope this helps someone

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I ve had the same problem in one of my modules   Running  mvn eclipse eclipse  in the console cmd solved the problem for me

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For me worked the answer I found on  CodeRanch  by user Maneesh Godbole         Close eclipse    Navigate to your  workspace  folder   Ensure the setting on your OS to view hidden files is turned on   Identify and delete the  metadata directory   Restart eclipse   Import project

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I had the same problem  None of the solutions here worked  I had to completely reinstall eclipse and make a new workspace  Then it worked

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deleting the local maven repository helped me

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I m using   Eclipse Java EE IDE for Web Developers   Version  Neon 3 Release  4 6 3  Build id  20170314-1500  The fix trick for me was deleting my local repository in    m2 repository in order to remove local dependencies and rebuilding my project in which fresh dependencies are pulled down

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I had to reinstall eclipse  delete  m2 folder and rebuild the jars

[eclipse] An internal error occurred during: "Updating Maven Project". java.lang.NullPointerException

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