java.lang.NullPointerException at org.sonatype.aether.impl.internal.DefaultMetadataResolver.resolve(DefaultMetadataResolver.java:283) at org.sonatype.aether.impl.internal.DefaultMetadataResolver.resolveMetadata(DefaultMetadataResolver.java:177) at org.apache.maven.repository.internal.DefaultVersionResolver.resolveVersion(DefaultVersionResolver.java:211) at org.sonatype.aether.impl.internal.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:276) at org.sonatype.aether.impl.internal.DefaultArtifactResolver.resolveArtifacts(DefaultArtifactResolver.java:220) at org.sonatype.aether.impl.internal.DefaultArtifactResolver.resolveArtifact(DefaultArtifactResolver.java:197) at org.sonatype.aether.impl.internal.DefaultRepositorySystem.resolveArtifact(DefaultRepositorySystem.java:323) at org.apache.maven.artifact.resolver.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:213) at org.apache.maven.artifact.resolver.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:381) at org.apache.maven.repository.legacy.LegacyRepositorySystem.resolve(LegacyRepositorySystem.java:352) at org.netbeans.modules.maven.embedder.MavenEmbedder.resolve(MavenEmbedder.java:219) at org.netbeans.modules.maven.api.NbMavenProject.downloadOneJavadocSources(NbMavenProject.java:439) at org.netbeans.modules.maven.api.NbMavenProject.access$600(NbMavenProject.java:88) at org.netbeans.modules.maven.api.NbMavenProject$2.run(NbMavenProject.java:409) Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.NullPointerException at org.openide.util.RequestProcessor.post(RequestProcessor.java:425) at org.netbeans.modules.maven.api.NbMavenProject.triggerSourceJavadocDownload(NbMavenProject.java:393) at org.netbeans.modules.maven.ProjectOpenedHookImpl.checkJavadocDownloads(ProjectOpenedHookImpl.java:278) at org.netbeans.modules.maven.ProjectOpenedHookImpl.projectOpened(ProjectOpenedHookImpl.java:112) at org.netbeans.spi.project.ui.ProjectOpenedHook$1.projectOpened(ProjectOpenedHook.java:84) at org.netbeans.spi.project.ui.support.UILookupMergerSupport$OpenHookImpl.projectOpened(UILookupMergerSupport.java:196) at org.netbeans.spi.project.ui.ProjectOpenedHook$1.projectOpened(ProjectOpenedHook.java:84) at org.netbeans.modules.project.ui.OpenProjectList.notifyOpened(OpenProjectList.java:1134) at org.netbeans.modules.project.ui.OpenProjectList.doOpenProject(OpenProjectList.java:1217) at org.netbeans.modules.project.ui.OpenProjectList.doOpen(OpenProjectList.java:708) at org.netbeans.modules.project.ui.OpenProjectList.access$2000(OpenProjectList.java:136) at org.netbeans.modules.project.ui.OpenProjectList$4.run(OpenProjectList.java:593) at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1424) at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1968)