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https://issues.apache.org/jira/browse/MCHECKSTYLE-333?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15823349#comment-15823349
]
James Short commented on MCHECKSTYLE-333:
-----------------------------------------
So I noticed that when I closed Intellij, which was pointing to these source
folders, that this behavior no longer occurred (60 mvn clean installs
approximately). Could having a running process which is reading from these
folders cause the ZipFile NPE?
> Intermittent NPE on checkstyle:check
> ------------------------------------
>
> Key: MCHECKSTYLE-333
> URL: https://issues.apache.org/jira/browse/MCHECKSTYLE-333
> Project: Maven Checkstyle Plugin
> Issue Type: Bug
> Affects Versions: 2.17
> Environment: OSX El Captain, java 8, maven 3.x, checkstyle 6.19
> Reporter: James Short
>
> I generally run checkstyle:check manually but I wanted to integrate it into
> the validate phase of my root build.
> After doing this, it will intermittent fail with an NPE:
> {code}
> [ERROR] Failed to execute goal
> org.apache.maven.plugins:maven-checkstyle-plugin:2.17:check (checkstyle) on
> project dropwizard-api: Execution checkstyle of goal
> org.apache.maven.plugins:maven-checkstyle-plugin:2.17:check failed.
> NullPointerException -> [Help 1]
> org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute
> goal org.apache.maven.plugins:maven-checkstyle-plugin:2.17:check (checkstyle)
> on project dropwizard-api: Execution checkstyle of goal
> org.apache.maven.plugins:maven-checkstyle-plugin:2.17:check failed.
> at
> org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:212)
> 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:116)
> at
> org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80)
> at
> org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)
> at
> org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)
> at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:307)
> at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193)
> at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106)
> at org.apache.maven.cli.MavenCli.execute(MavenCli.java:863)
> at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:288)
> at org.apache.maven.cli.MavenCli.main(MavenCli.java:199)
> 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: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
> checkstyle of goal
> org.apache.maven.plugins:maven-checkstyle-plugin:2.17:check failed.
> at
> org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:145)
> at
> org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:207)
> ... 20 more
> Caused by: java.lang.NullPointerException
> at java.util.zip.ZipFile.getZipEntry(ZipFile.java:566)
> at java.util.zip.ZipFile.access$900(ZipFile.java:60)
> at java.util.zip.ZipFile$ZipEntryIterator.next(ZipFile.java:524)
> at java.util.zip.ZipFile$ZipEntryIterator.nextElement(ZipFile.java:499)
> at java.util.zip.ZipFile$ZipEntryIterator.nextElement(ZipFile.java:480)
> at java.util.jar.JarFile$JarEntryIterator.next(JarFile.java:257)
> at java.util.jar.JarFile$JarEntryIterator.nextElement(JarFile.java:266)
> at java.util.jar.JarFile$JarEntryIterator.nextElement(JarFile.java:247)
> at
> org.codehaus.plexus.resource.loader.JarHolder.getEntries(JarHolder.java:132)
> 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:75)
> at
> org.codehaus.plexus.resource.DefaultResourceManager.getResourceAsFile(DefaultResourceManager.java:91)
> at
> org.apache.maven.plugin.checkstyle.exec.DefaultCheckstyleExecutor.getOverridingProperties(DefaultCheckstyleExecutor.java:564)
> at
> org.apache.maven.plugin.checkstyle.exec.DefaultCheckstyleExecutor.getConfiguration(DefaultCheckstyleExecutor.java:379)
> at
> org.apache.maven.plugin.checkstyle.exec.DefaultCheckstyleExecutor.executeCheckstyle(DefaultCheckstyleExecutor.java:217)
> at
> org.apache.maven.plugin.checkstyle.CheckstyleViolationCheckMojo.execute(CheckstyleViolationCheckMojo.java:538)
> at
> org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
> ... 21 more
> [ERROR]
> [ERROR] Re-run Maven using the -X switch to enable full debug logging.
> {code}
> My pom config:
> {code}
> <plugin>
> <groupId>org.apache.maven.plugins</groupId>
> <artifactId>maven-checkstyle-plugin</artifactId>
> <version>2.17</version>
> <configuration>
>
> <configLocation>build-tools/src/main/resources/checkstyle/checkstyle.xml</configLocation>
>
> <includeTestSourceDirectory>true</includeTestSourceDirectory>
>
> <suppressionsLocation>build-tools/src/main/resources/checkstyle/suppressions.xml</suppressionsLocation>
> <linkXRef>false</linkXRef>
> </configuration>
> <executions>
> <execution>
> <id>checkstyle</id>
> <phase>validate</phase>
> <goals>
> <goal>check</goal>
> </goals>
> <configuration>
> <failOnViolation>true</failOnViolation>
> <encoding>UTF-8</encoding>
> <consoleOutput>true</consoleOutput>
> <failsOnError>true</failsOnError>
> <linkXRef>false</linkXRef>
> </configuration>
> </execution>
> </executions>
> <dependencies>
> <dependency>
> <groupId>org.coner</groupId>
> <artifactId>build-tools</artifactId>
> <version>1.0</version>
> </dependency>
> <dependency>
> <groupId>com.puppycrawl.tools</groupId>
> <artifactId>checkstyle</artifactId>
> <version>6.19</version>
> </dependency>
> </dependencies>
> </plugin>
> {code}
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