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From "Dennis Lundberg (JIRA)" <j...@codehaus.org>
Subject [jira] (MCHECKSTYLE-231) NPE on mvn compile
Date Wed, 11 Jun 2014 13:27:10 GMT

    [ https://jira.codehaus.org/browse/MCHECKSTYLE-231?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=347859#comment-347859
] 

Dennis Lundberg edited comment on MCHECKSTYLE-231 at 6/11/14 8:26 AM:
----------------------------------------------------------------------

Hi Marcus

Looking closer at your stack trace show that the problem occurs when trying to access resources
in a JAR file, while looking for a license. This is a new piece of code in this plugin (@since
2.12) Does your project have a LICENSE file in it?

Some more questions for you:

The configuration in your root pom, is that snippet inside build/pluginManagement/plugins
?

You have bound the Checkstyle execution in the root pom to the install phase. So it shouldnät
be running if you invoke 'mvn compile' since that does not include the install phase. Is there
a special reason why you have bound the plugin execution to the install phase? The other execution
in the 'all' profile doesn't have specify a phase, but has the same id as the one in the root
pom, so they should be merged when executed.

To see your actual running configuration I suggest running the following commands:
{noformat}
mvn help:effective-pom > no-profile.txt
mvn help:effective-pom -Pall > all-profile.txt
{noformat}
The have a look at the generated files to see what differs between them.

If you want to have a look at the source, go to this page for instructions:
http://maven.apache.org/plugins/maven-checkstyle-plugin/source-repository.html


was (Author: dennislundberg):
Hi Marcus

Looking closer at your stack trace show that the problem occurs when trying to access resources
in a JAR file, while looking for a license. This is a new piece of code in this plugin (@since
2.12) Does your project have a LICENSE file in it?

Some more questions for you:

The configuration in your root pom, is that snippet inside build/pluginManagement/plugins
?

You have bound the Checkstyle execution in the root pom to the install phase. So it shouldnät
be running if you invoke 'mvn compile' since that does not include the install phase. Is there
a special reason why you have bound the plugin execution to the install phase? The other execution
in the 'all' profile doesn't have specify a phase, but has the same id as the one in the root
pom, so they should be merged when executed.

To see your actual running configuration I suggest running the following commands:
mvn help:effective-pom > no-profile.txt
mvn help:effective-pom -Pall > all-profile.txt
The have a look at the generated files to see what differs between them.

If you want to have a look at the source, go to this page for instructions:
http://maven.apache.org/plugins/maven-checkstyle-plugin/source-repository.html

> NPE on mvn compile
> ------------------
>
>                 Key: MCHECKSTYLE-231
>                 URL: https://jira.codehaus.org/browse/MCHECKSTYLE-231
>             Project: Maven Checkstyle Plugin
>          Issue Type: Bug
>    Affects Versions: 2.12.1
>         Environment: Apache Maven 3.2.1 (ea8b2b07643dbb1b84b6d16e1f08391b666bc1e9; 2014-02-14T18:37:52+01:00)
> Maven home: /usr/local/Cellar/maven/3.2.1/libexec
> Java version: 1.7.0_51, vendor: Oracle Corporation
> Java home: /Library/Java/JavaVirtualMachines/jdk1.7.0_51.jdk/Contents/Home/jre
> Default locale: en_US, platform encoding: UTF-8
> OS name: "mac os x", version: "10.9.2", arch: "x86_64", family: "mac"
> checkstyle plugin version: 2.12.1
>            Reporter: Marcus Höjvall
>            Priority: Critical
>
> I'm getting a NullPointerError when running:
> {code} mvn clean compile -Pall {code}
> And all is a profile running the checkstyle plugin. This however works if I run install
instead of compile, like this:
> {code} mvn clean install -Pall {code}
> Compile however works good when running it on a submodule but not on the root module.
> I don't know how to proceed and maven told me to contact the plugin maintainers through
this link: https://cwiki.apache.org/confluence/display/MAVEN/PluginExecutionException
> Please let me know if there is anymore information that I need to provide or other ways
to help out
> Stacktrace:
> {code}
> [ERROR] Failed to execute goal org.apache.maven.plugins:maven-checkstyle-plugin:2.12.1:checkstyle
(validate) on project commons: Execution validate of goal org.apache.maven.plugins:maven-checkstyle-plugin:2.12.1:checkstyle
failed. NullPointerException -> [Help 1]
> org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-checkstyle-plugin:2.12.1:checkstyle
(validate) on project commons: Execution validate of goal org.apache.maven.plugins:maven-checkstyle-plugin:2.12.1:checkstyle
failed.
> 	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:224)
> 	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:108)
> 	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:76)
> 	at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)
> 	at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:116)
> 	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:361)
> 	at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:155)
> 	at org.apache.maven.cli.MavenCli.execute(MavenCli.java:584)
> 	at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:213)
> 	at org.apache.maven.cli.MavenCli.main(MavenCli.java:157)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> 	at java.lang.reflect.Method.invoke(Method.java:606)
> 	at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
> 	at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
> 	at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
> 	at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
> Caused by: org.apache.maven.plugin.PluginExecutionException: Execution validate of goal
org.apache.maven.plugins:maven-checkstyle-plugin:2.12.1:checkstyle failed.
> 	at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:144)
> 	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:208)
> 	... 19 more
> Caused by: java.lang.NullPointerException
> 	at org.codehaus.plexus.resource.loader.JarHolder.getEntries(JarHolder.java:126)
> 	at org.codehaus.plexus.resource.loader.JarResourceLoader.loadJar(JarResourceLoader.java:100)
> 	at org.codehaus.plexus.resource.loader.JarResourceLoader.initialize(JarResourceLoader.java:63)
> 	at org.codehaus.plexus.resource.loader.JarResourceLoader.getResource(JarResourceLoader.java:141)
> 	at org.apache.maven.plugin.checkstyle.resource.LicenseResourceManager.getResource(LicenseResourceManager.java:70)
> 	at org.codehaus.plexus.resource.DefaultResourceManager.getResourceAsFile(DefaultResourceManager.java:91)
> 	at org.apache.maven.plugin.checkstyle.DefaultCheckstyleExecutor.getOverridingProperties(DefaultCheckstyleExecutor.java:460)
> 	at org.apache.maven.plugin.checkstyle.DefaultCheckstyleExecutor.getConfiguration(DefaultCheckstyleExecutor.java:299)
> 	at org.apache.maven.plugin.checkstyle.DefaultCheckstyleExecutor.executeCheckstyle(DefaultCheckstyleExecutor.java:185)
> 	at org.apache.maven.plugin.checkstyle.AbstractCheckstyleReport.executeReport(AbstractCheckstyleReport.java:488)
> 	at org.apache.maven.plugin.checkstyle.CheckstyleReport.executeReport(CheckstyleReport.java:156)
> 	at org.apache.maven.reporting.AbstractMavenReport.generate(AbstractMavenReport.java:196)
> 	at org.apache.maven.reporting.AbstractMavenReport.execute(AbstractMavenReport.java:104)
> 	at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:133)
> 	... 20 more
> {code}
> Root pom
> {code:xml}
>                                 <plugin>
> 					<artifactId>maven-checkstyle-plugin</artifactId>
> 					<version>2.12.1</version>
> 					<dependencies>
> 						<dependency>
> 							<groupId>com.izettle</groupId>
> 							<artifactId>build-tools</artifactId>
> 							<version>1.0</version>
> 						</dependency>
> 					</dependencies>
> 					<executions>
> 						<execution>
> 							<id>validate</id>
> 							<phase>install</phase>
> 							<goals>
> 								<goal>checkstyle</goal>
> 							</goals>
> 							<configuration>
> 								<includeTestSourceDirectory>false</includeTestSourceDirectory>
> 								<failsOnError>true</failsOnError>
> 								<consoleOutput>true</consoleOutput>
> 								<configLocation>checkstyle/checkstyle.xml</configLocation>
> 								<linkXRef>false</linkXRef>
> 								<propertyExpansion>checkstyle-suppression-file=${project.basedir}/checkstyle-suppression.xml</propertyExpansion>
> 							</configuration>
> 						</execution>
> 					</executions>
> 				</plugin>
> {code}
> {code:xml}
>         <profile>
>             <id>all</id>
>             <build>
>                 <plugins>
>                     <plugin>
>                         <artifactId>maven-checkstyle-plugin</artifactId>
>                         <executions>
>                             <execution>
>                                 <configuration>
>                                     <propertyExpansion>projectDir=${project.basedir
</propertyExpansion>
>                                 </configuration>
>                                 <id>validate</id>
>                                 <goals>
>                                     <goal>checkstyle</goal>
>                                 </goals>
>                             </execution>
>                         </executions>
>                     </plugin>
>                 </plugins>
>             </build>
>         </profile>
> {code}



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