[
http://jira.codehaus.org/browse/MWAR-169?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=147323#action_147323
]
Jonathan Ramsey commented on MWAR-169:
--------------------------------------
This problem occurs when you run any of the goals on version 2.1-alpha-2 of the
maven-war-plugin after running any of the goals on version 2.1-alpha-1, without
a clean of the project between. The change in version might occur without you
knowing if you hadn't explictely set the version of maven-war-plugin in your
pom.xml. Your first run of a war:goal occur prior to the release of
2.1-alpha-2, and your second run of a war:goal your first goal was run before
2.1-alpha-2 was released, and your second goal was run after 2.1-alpha-2 was
released and you hadn't explictely set the version of maven-war-plugin in your
pom.xml.
The problem is caused because a dependenciesInfo variable was added to
org.apache.maven.plugin.war.util.WebappStructure in r606628, but no defensive
initialization of the variable was added to the readResolve() method. r606628
was released in maven-war-plugin version 2.1-alpha-2.
http://svn.apache.org/viewvc/maven/plugins/tags/maven-war-plugin-2.1-alpha-2/src/main/java/org/apache/maven/plugin/war/util/WebappStructure.java?view=diff&r1=606627&r2=606628
When one of the war goals is executed, maven-war-plugin 2.1-alpha-1 uses
XStream to serialize a WebappStructure object to
target\war\work\webapp-cache.xml. Provided you haven't cleaned your project,
when you next run one of the war goals the maven-war-plugin 2.1-alpha-2
deserializes the WebappStructure object from target\war\work\webapp-cache.xml.
The dependenciesInfo variable is not initialized with a value because the
webapp-cache.xml doesn't contain a <dependenciesInfo> element and the
readResolve() method doesn't initialize the variable defensively. When the
WebappStructure.getDependencies() method is invoked, dependenciesInfo is
dereferenced which triggers a NullPointerException.
Steps to reproduce:
1. mvn archetype:create -DarchetypeArtifactId=maven-archetype-webapp
-DarchetypeVersion=1.0 -DgroupId=test -DartifactId=webapp
2. cd webapp
3. Add this to <build> in pom.xml.
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>2.1-alpha-1</version>
</plugin>
</plugins>
4. mvn package
5. Change version from 2.1-alpha-1 to 2.1-alpha-2
6. mvn package
You reproduce the error:
[INFO] Scanning for projects...
[INFO]
----------------------------------------------------------------------------
[INFO] Building webapp Maven Webapp
[INFO] task-segment: [package]
[INFO]
----------------------------------------------------------------------------
[INFO] [resources:resources]
[INFO] Using default encoding to copy filtered resources.
[INFO] [compiler:compile]
[INFO] No sources to compile
[INFO] [resources:testResources]
[INFO] Using default encoding to copy filtered resources.
[INFO] [compiler:testCompile]
[INFO] No sources to compile
[INFO] [surefire:test]
[INFO] No tests to run.
[INFO] [war:war]
[INFO] Packaging webapp
[INFO] Assembling webapp[webapp] in [C:\WebTeam\projects\webapp\target\webapp]
[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:443)
at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:539)
at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalWithLifecycle(DefaultLifecycleExecutor.java:480)
at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:459)
at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:311)
at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:278)
at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:143)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:334)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:125)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:280)
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.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)
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 3 seconds
[INFO] Finished at: Mon Sep 08 14:14:58 BST 2008
[INFO] Final Memory: 8M/63M
[INFO] ------------------------------------------------------------------------
> 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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