Maven download sources: fails with NPE [SOLVED]

Hi guys,

We run into problems when we want to download our sources jars. They are available on the artifactory server but the download does not work. I've trace with wireshark no request is made/sent.

In de idea.log file I found a NPE (see below) but I can't figure out what cause the problem. The line where the NPE occurs is:

       File checkFile = new File(session.getLocalRepository().getBasedir(), session.getLocalRepositoryManager().getPathForRemoteMetadata(metadata, repository, request.getRequestContext()));

2015-03-31 11:21:18,713 [ 494026]   INFO -      #org.jetbrains.idea.maven -
java.lang.NullPointerException
 at org.sonatype.aether.impl.internal.DefaultMetadataResolver.resolve(DefaultMetadataResolver.java:279)
 at org.sonatype.aether.impl.internal.DefaultMetadataResolver.resolveMetadata(DefaultMetadataResolver.java:173)
 at org.apache.maven.repository.internal.DefaultVersionResolver.resolveVersion(DefaultVersionResolver.java:225)
 at org.sonatype.aether.impl.internal.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:272)
 at org.sonatype.aether.impl.internal.DefaultArtifactResolver.resolveArtifacts(DefaultArtifactResolver.java:216)
 at org.sonatype.aether.impl.internal.DefaultArtifactResolver.resolveArtifact(DefaultArtifactResolver.java:193)
 at org.sonatype.aether.impl.internal.DefaultRepositorySystem.resolveArtifact(DefaultRepositorySystem.java:286)
 at org.jetbrains.idea.maven.server.embedder.CustomMaven3ArtifactResolver.resolveOld(CustomMaven3ArtifactResolver.java:206)
 at org.jetbrains.idea.maven.server.embedder.CustomMaven3ArtifactResolver.resolve(CustomMaven3ArtifactResolver.java:152)
 at org.jetbrains.idea.maven.server.embedder.CustomMaven3ArtifactResolver.resolve(CustomMaven3ArtifactResolver.java:139)
 at org.jetbrains.idea.maven.server.embedder.CustomMaven3ArtifactResolver.resolve(CustomMaven3ArtifactResolver.java:518)
 at org.jetbrains.idea.maven.server.Maven3ServerEmbedderImpl.resolve(Maven3ServerEmbedderImpl.java:753)
 at org.jetbrains.idea.maven.server.Maven3ServerEmbedderImpl.doResolve(Maven3ServerEmbedderImpl.java:731)
 at org.jetbrains.idea.maven.server.Maven3ServerEmbedderImpl.doResolve(Maven3ServerEmbedderImpl.java:725)
 at org.jetbrains.idea.maven.server.Maven3ServerEmbedderImpl.resolve(Maven3ServerEmbedderImpl.java:637)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 at java.lang.reflect.Method.invoke(Method.java:606)
 at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:322)
 at sun.rmi.transport.Transport$1.run(Transport.java:177)
 at sun.rmi.transport.Transport$1.run(Transport.java:174)
 at java.security.AccessController.doPrivileged(Native Method)
 at sun.rmi.transport.Transport.serviceCall(Transport.java:173)
 at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:556)
 at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:811)
 at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:670)
 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
 at java.lang.Thread.run(Thread.java:744)