Apologies, I had replied to the wrong
        thread.
    On your successful build, I see:
    [INFO] Building de.cognicrypt.crysl.handler 1.0.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] Downloading from xtend: http://build.eclipse.org/common/xtend/maven/de/darmstadt/tu/crossing/CryptSL/de.darmstadt.tu.crossing.CryptSL/1.0.0-SNAPSHOT/maven-metadata.xml
[WARNING] Checksum validation failed, expected <!doctype but is c143977810d6345b60e0d28515110a949a29a3a8 from xtend for http://build.eclipse.org/common/xtend/maven/de/darmstadt/tu/crossing/CryptSL/de.darmstadt.tu.crossing.CryptSL/1.0.0-SNAPSHOT/maven-metadata.xml
[WARNING] Could not validate integrity of download from http://build.eclipse.org/common/xtend/maven/de/darmstadt/tu/crossing/CryptSL/de.darmstadt.tu.crossing.CryptSL/1.0.0-SNAPSHOT/maven-metadata.xml: Checksum validation failed, expected <!doctype but is c143977810d6345b60e0d28515110a949a29a3a8
[WARNING] Checksum validation failed, expected <!doctype but is c143977810d6345b60e0d28515110a949a29a3a8 from xtend for http://build.eclipse.org/common/xtend/maven/de/darmstadt/tu/crossing/CryptSL/de.darmstadt.tu.crossing.CryptSL/1.0.0-SNAPSHOT/maven-metadata.xml
[INFO] Downloaded from xtend: http://build.eclipse.org/common/xtend/maven/de/darmstadt/tu/crossing/CryptSL/de.darmstadt.tu.crossing.CryptSL/1.0.0-SNAPSHOT/maven-metadata.xml (1.2 kB at 355 B/s)
[WARNING] The metadata /var/lib/jenkins/.m2/repository/de/darmstadt/tu/crossing/CryptSL/de.darmstadt.tu.crossing.CryptSL/1.0.0-SNAPSHOT/maven-metadata-xtend.xml is invalid: unexpected markup <!d (position: START_DOCUMENT seen <!d... @1:3) 
[WARNING] The metadata /var/lib/jenkins/.m2/repository/de/darmstadt/tu/crossing/CryptSL/de.darmstadt.tu.crossing.CryptSL/1.0.0-SNAPSHOT/maven-metadata-xtend.xml is invalid: unexpected markup <!d (position: START_DOCUMENT seen <!d... @1:3) 
Notice the Validation Failed and Unexpected Markup.
On the failed build, I see:
[INFO] Building de.cognicrypt.crysl.handler 1.0.0-SNAPSHOT               [4/10]
[INFO] ---------------------------[ eclipse-plugin ]---------------------------
[DEBUG] Using transporter WagonTransporter with priority -1.0 for http://build.eclipse.org/common/xtend/maven/
[INFO] Downloading from xtend: http://build.eclipse.org/common/xtend/maven/de/darmstadt/tu/crossing/CryptSL/de.darmstadt.tu.crossing.CryptSL/1.0.0-SNAPSHOT/maven-metadata.xml
[WARNING] Could not transfer metadata de.darmstadt.tu.crossing.CryptSL:de.darmstadt.tu.crossing.CryptSL:1.0.0-SNAPSHOT/maven-metadata.xml from/to xtend (http://build.eclipse.org/common/xtend/maven/): eclipse.org: Name or service not known
[WARNING] Failure to transfer de.darmstadt.tu.crossing.CryptSL:de.darmstadt.tu.crossing.CryptSL:1.0.0-SNAPSHOT/maven-metadata.xml from http://build.eclipse.org/common/xtend/maven/ was cached in the local repository, resolution will not be reattempted until the update interval of xtend has elapsed or updates are forced. Original error: Could not transfer metadata de.darmstadt.tu.crossing.CryptSL:de.darmstadt.tu.crossing.CryptSL:1.0.0-SNAPSHOT/maven-metadata.xml from/to xtend (http://build.eclipse.org/common/xtend/maven/): eclipse.org: Name or service not known
    
    
    In the end, this URL is a 404:
    http://build.eclipse.org/common/xtend/maven/de/darmstadt/tu/crossing/CryptSL/de.darmstadt.tu.crossing.CryptSL/1.0.0-SNAPSHOT/maven-metadata.xml
    
    
    I'm not sure why that succeeds on your end, because it never gets
      downloaded anyway. Perhaps one build job does not fail on
      warnings.
    
    At any rate, obtaining Xtend from build.eclipse.org has to be
      severely outdated.
    
    
     Denis
    
    
    
    
    On 2019-04-08 6:32 a.m., Johannes
      Spaeth wrote:
    
    
      
      Hi all,
      
      
      we are trying to set up the
          official
          Eclipse Jenkins server for CogniCrypt. (https://jenkins.eclipse.org/cognicrypt/job/CogniCrypt/)
          
          However the builds (https://jenkins.eclipse.org/cognicrypt/job/CogniCrypt/69/console)
           fails to load a dependencies:
          
          [ERROR] Failed to execute goal on project
          de.cognicrypt.crysl.handler:
          Could not resolve dependencies for project
          de.cognicrypt:de.cognicrypt.crysl.handler:eclipse-plugin:1.0.0-SNAPSHOT:
          Failed to collect dependencies at
de.darmstadt.tu.crossing.CryptSL:de.darmstadt.tu.crossing.CryptSL:jar:1.0.0-SNAPSHOT:Failed
          to read artifact descriptor for
de.darmstadt.tu.crossing.CryptSL:de.darmstadt.tu.crossing.CryptSL:jar:1.0.0-SNAPSHOT:Could
          not transfer artifact
de.darmstadt.tu.crossing.CryptSL:de.darmstadt.tu.crossing.CryptSL:pom:1.0.0-SNAPSHOTfrom/to
          xtend (http://build.eclipse.org/common/xtend/maven/):
          eclipse.org: Unknown host eclipse.org -> [Help 1]
          
          We have setup our own Jenkins server with the exact same
          configuration
          (https://soot-build.cs.uni-paderborn.de/jenkins/job/boomerang/job/eclipse-cognicrypt/1/),
          and the build succeeds.
          
          The error appears when fetching the artifact from http://build.eclipse.org/common/xtend/maven/,
          however the jar is deployed to this repository: https://it.crossing.tu-darmstadt.de/cognicrypt,
          which is also mentioned in the pom.xml
      
      
      Does anyone have an idea how to
          resolve
          the issue?
      
      
      Thanks a lot.
      
      
      Cheers,
      
      
      Johannes
      
      
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    -- 
      Denis Roy
      Director, IT Services | Eclipse Foundation, Inc.
      Eclipse Foundation: The Platform for Open Innovation and Collaboration
      Twitter: @droy_eclipse