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https://jira.codehaus.org/browse/MCHECKSTYLE-231?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=347798#comment-347798
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Dennis Lundberg commented on MCHECKSTYLE-231:
---------------------------------------------
Hi Marcus,
The way you are referencing the Checkstyle configuration files in build-tools
is not the correct way to do it. When using Maven you should never directly try
to access files outside of a project's directory. Please follow the
instructions here:
http://maven.apache.org/plugins/maven-checkstyle-plugin/examples/multi-module-config.html
I'm not 100% sure that this is the the reason for your NPE, but you should try
this first.
If you need to run 'mvn install' to make a build work and 'mvn verify' doesn't
work, it is usually a sign that you are somehow violating the Maven principle
that each project/artifact should be self contained and all the necessary
resources should be available on the classpath (through some dependency
mechanism).
> 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 izettle-ejb: 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 izettle-ejb: 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.company</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>${project.parent.basedir}/company-build-tools/src/main/resources/checkstyle/checkstyle.xml</configLocation>
> <linkXRef>false</linkXRef>
>
> <propertyExpansion>checkstyle-suppression-file=${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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