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http://jira.codehaus.org/browse/MWAR-169?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=147139#action_147139
]
Maarten Billemont commented on MWAR-169:
----------------------------------------
This might be interesting; done after the process of building from the parent
failed on artifact "safe-online-owner-webapp":
cd "safe-online-owner-webapp"
cp -a target target~
mvn clean install # successful
diff -ur target~ target
The result shows only one file is different: "war/work/webapp-cache.xml"
The old version of this file (from target~; the target dir that caused the
build to fail) contained an entry for
"net.lin-k.safe-online:safe-online-startup-runtime" which is NOT the artifact
that should be overlayed on this artifact.
The new version of this file (from target; the target dir that caused the build
to succeed) contained an entry for
"net.lin-k.safe-online:safe-online-webapp-base" which IS the artifact that
should be overlayed on this artifact. So that's good.
Basically; I conclude something has gone wrong in the caching backend of
maven-war-plugin.
> NPE during packaging.
> ---------------------
>
> Key: MWAR-169
> URL: http://jira.codehaus.org/browse/MWAR-169
> Project: Maven 2.x War Plugin
> Issue Type: Bug
> Affects Versions: 2.1-alpha-2
> Reporter: Maarten Billemont
>
> The following NPE happens when I run maven from the parent in a multi-module
> project; though it does not occur when I run mvn clean install from within
> the module itself.
> [INFO] [war:war]
> [INFO] Packaging webapp
> [INFO] Assembling webapp[safe-online-startup-runtime] in
> [/Users/mbillemo/Documents/workspace/safe-online/safe-online-startup-runtime/target/safe-online-startup-
> runtime-1.1-SNAPSHOT]
> [INFO]
> ------------------------------------------------------------------------
> [ERROR] FATAL ERROR
> [INFO]
> ------------------------------------------------------------------------
> [INFO] null
> [INFO]
> ------------------------------------------------------------------------
> [INFO] Trace
> java.lang.NullPointerException
> at
> org.apache.maven.plugin.war.util.WebappStructure.getDependencies(WebappStructure.java:109)
> at
> org.apache.maven.plugin.war.util.WebappStructure.analyseDependencies(WebappStructure.java:288)
> at
> org.apache.maven.plugin.war.packaging.DependenciesAnalysisPackagingTask.performPackaging(DependenciesAnalysisPackagingTask.java:46)
> at
> org.apache.maven.plugin.war.AbstractWarMojo.buildWebapp(AbstractWarMojo.java:439)
> at
> org.apache.maven.plugin.war.AbstractWarMojo.buildExplodedWebapp(AbstractWarMojo.java:375)
> at
> org.apache.maven.plugin.war.WarMojo.performPackaging(WarMojo.java:181)
> at org.apache.maven.plugin.war.WarMojo.execute(WarMojo.java:143) at
> org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:451)
> at
> org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:558)
> at
> org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalWithLifecycle(DefaultLifecycleExecutor.java:499)
> at
> org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:478)
> at
> org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:330)
> at
> org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:291)
> at
> org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:142)
> at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:336)
> at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:129) at
> org.apache.maven.cli.MavenCli.main(MavenCli.java:287) 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:585)
> at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
> at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
> at
> org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
> at org.codehaus.classworlds.Launcher.main(Launcher.java:375)
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