Mark Derricutt created MNG-6647:
-----------------------------------
Summary: NPE in DefaultReportingConverter
Key: MNG-6647
URL: https://issues.apache.org/jira/browse/MNG-6647
Project: Maven
Issue Type: Bug
Reporter: Mark Derricutt
I discovered this NPE whilst running some integration tests for our
tiles-maven-plugin:
{{ O] Scanning for projects...}}
{{[INFO] --- tiles-maven-plugin: Injecting 1 tiles as intermediary parent
artifacts for com.test:reporting-tiletest...}}
{{[INFO] Mixed 'com.test:reporting-tiletest:0.1.0' with tile
'com.test:reporting-tiletest-tile:0.1.0' as its new parent.}}
{{[INFO] Mixed 'com.test:reporting-tiletest-tile:0.1.0' with original parent
'(no parent)' as its new top level parent.}}
{{[INFO] }}
{{[ERROR] Internal error: java.lang.NullPointerException -> [Help 1]}}
{{org.apache.maven.InternalErrorException: Internal error:
java.lang.NullPointerException}}
{{ at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:120)}}
{{ at org.apache.maven.cli.MavenCli.execute (MavenCli.java:956)}}
{{ at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:288)}}
{{ at org.apache.maven.cli.MavenCli.main (MavenCli.java:192)}}
{{ at sun.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)}}
{{ at sun.reflect.NativeMethodAccessorImpl.invoke
(NativeMethodAccessorImpl.java:62)}}
{{ at sun.reflect.DelegatingMethodAccessorImpl.invoke
(DelegatingMethodAccessorImpl.java:43)}}
{{ at java.lang.reflect.Method.invoke (Method.java:498)}}
{{ at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced
(Launcher.java:282)}}
{{ at org.codehaus.plexus.classworlds.launcher.Launcher.launch
(Launcher.java:225)}}
{{ at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode
(Launcher.java:406)}}
{{ at org.codehaus.plexus.classworlds.launcher.Launcher.main
(Launcher.java:347)}}
{{Caused by: java.lang.NullPointerException}}
{{ at org.apache.maven.model.plugin.DefaultReportingConverter.convert
(DefaultReportingConverter.java:243)}}
{{ at org.apache.maven.model.plugin.DefaultReportingConverter.convert
(DefaultReportingConverter.java:213)}}
{{ at org.apache.maven.model.plugin.DefaultReportingConverter.convertReporting
(DefaultReportingConverter.java:140)}}
{{ at org.apache.maven.model.building.DefaultModelBuilder.build
(DefaultModelBuilder.java:479)}}
{{ at org.apache.maven.model.building.DefaultModelBuilder.build
(DefaultModelBuilder.java:432)}}
{{ at org.apache.maven.model.building.ModelBuilder$build$0.call (Unknown
Source)}}
{{ at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall
(CallSiteArray.java:47)}}
{{ at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call
(AbstractCallSite.java:116)}}
{{ at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call
(AbstractCallSite.java:136)}}
{{ at io.repaint.maven.tiles.TilesMavenLifecycleParticipant.thunkModelBuilder
(TilesMavenLifecycleParticipant.groovy:460)}}
{{ at io.repaint.maven.tiles.TilesMavenLifecycleParticipant.orchestrateMerge
(TilesMavenLifecycleParticipant.groovy:362)}}
{{ at io.repaint.maven.tiles.TilesMavenLifecycleParticipant.afterProjectsRead
(TilesMavenLifecycleParticipant.groovy:306)}}
{{ at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:264)}}
{{ at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)}}
{{ at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)}}
{{ at org.apache.maven.cli.MavenCli.execute (MavenCli.java:956)}}
{{ at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:288)}}
{{ at org.apache.maven.cli.MavenCli.main (MavenCli.java:192)}}
{{ at sun.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)}}
{{ at sun.reflect.NativeMethodAccessorImpl.invoke
(NativeMethodAccessorImpl.java:62)}}
{{ at sun.reflect.DelegatingMethodAccessorImpl.invoke
(DelegatingMethodAccessorImpl.java:43)}}
{{ at java.lang.reflect.Method.invoke (Method.java:498)}}
{{ at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced
(Launcher.java:282)}}
{{ at org.codehaus.plexus.classworlds.launcher.Launcher.launch
(Launcher.java:225)}}
{{ at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode
(Launcher.java:406)}}
{{ at org.codehaus.plexus.classworlds.launcher.Launcher.main
(Launcher.java:347)}}
This was triggered when running our sitereporting test (
[https://github.com/repaint-io/maven-tiles/tree/master/src/it/sitereporting-tiletest]
) and doesn't trigger an NPE using Apache Maven 3.5.3, but does with the
current SNAPSHOT of 3.6.2.
The problem lies when Maven is building the model from
[https://github.com/repaint-io/maven-tiles/blob/master/src/it/sitereporting-tiletest/tile-tile/tile.xml#L35]
and can be fixed by applying the patch found at
[https://www.dropbox.com/s/9gficrmlgxl2jd0/0001-Fix-NPE-thrown-from-DefaultReportingConverter.patch?dl=0]
(for some reason I could not attach the patch to the ticket).
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