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[tycho-user] strange tycho errors
The egit [1] and egit-github [2] gerrit-trigger build jobs used to verify
changes uploaded for code review experience some strange errors
since a couple of days.

[1] reproducably hits a NPE (using tycho 0.12)

[ERROR] Failed to execute goal org.eclipse.tycho:tycho-p2-plugin:0.12.0:update-site-p2-metadata (default-update-site-p2-metadata) on project org.eclipse.egit-updatesite: Cannot generate P2 metadata: java.lang.NullPointerException -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.eclipse.tycho:tycho-p2-plugin:0.12.0:update-site-p2-metadata (default-update-site-p2-metadata) on project org.eclipse.egit-updatesite: Cannot generate P2 metadata
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:217)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
	at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
	at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:319)
	at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
	at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)
	at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
	at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)
	at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
	at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)
	at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)
Caused by: org.apache.maven.plugin.MojoExecutionException: Cannot generate P2 metadata
	at org.eclipse.tycho.plugins.p2.AbstractP2MetadataMojo.execute(AbstractP2MetadataMojo.java:95)
	at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
	... 19 more
Caused by: java.lang.RuntimeException: java.lang.NullPointerException
	at org.eclipse.tycho.p2.facade.internal.P2ApplicationLauncher.execute(P2ApplicationLauncher.java:127)
	at org.eclipse.tycho.plugins.p2.AbstractP2MetadataMojo.generateMetadata(AbstractP2MetadataMojo.java:112)
	at org.eclipse.tycho.plugins.p2.AbstractP2MetadataMojo.execute(AbstractP2MetadataMojo.java:88)
	... 21 more
Caused by: java.lang.NullPointerException
	at org.eclipse.tycho.core.osgitools.DefaultBundleReader.toProperties(DefaultBundleReader.java:162)
	at org.eclipse.tycho.core.osgitools.DefaultBundleReader.parseHeader(DefaultBundleReader.java:173)
	at org.eclipse.tycho.core.osgitools.OsgiBundleProject.readArtifactKey(OsgiBundleProject.java:130)
	at org.eclipse.tycho.p2.facade.internal.P2ApplicationLauncher.addBundle(P2ApplicationLauncher.java:132)
	at org.eclipse.tycho.p2.facade.internal.P2ApplicationLauncher.execute(P2ApplicationLauncher.java:99)
	... 23 more

[2] (using tycho 0.13) seems to fail to download some of the tycho plugins and then fails with a ClassNotFoundException

Wiping the workspace to remove the job private maven repo doesn't seem to help in both cases.
I tried this many times, also Jan Sievers looked into these failing jobs and we are running out
of ideas what could be the cause of these.build errors. Today I also saw the second issue when 
running the egit-github build locally. Again wiping the local maven repository didn't resolve the 
issue. What helped was to remove the tycho plugins from the local maven repository and then 
rerunning the build, wiping the complete Maven repository didn't help.

[1] https://hudson.eclipse.org/sandbox/job/egit.gerrit/
[2] https://hudson.eclipse.org/sandbox/job/egit-github.gerrit/

--
Matthias

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