Checkstyle plugin gives NPE

Help/Discuss
1

Hi everyone,

I’m trying add the checkstyle plugin. It seems that it can’t load the configuration file; I’m using this exact same configuration file in ant directly. Any ideas? I’m using Gradle 2.6

Stacktrace:

Caused by: : Unable to create a Checker: null
    at com.puppycrawl.tools.checkstyle.CheckStyleTask.createChecker(CheckStyleTask.java:362)
    at com.puppycrawl.tools.checkstyle.CheckStyleTask.realExecute(CheckStyleTask.java:280)
    at com.puppycrawl.tools.checkstyle.CheckStyleTask.execute(CheckStyleTask.java:243)
    at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:292)
    at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
    at org.gradle.api.internal.project.ant.BasicAntBuilder.nodeCompleted(BasicAntBuilder.java:77)
    at org.gradle.api.internal.project.AntBuilderDelegate.nodeCompleted(DefaultIsolatedAntBuilder.groovy:177)
    at org.gradle.api.plugins.quality.Checkstyle$_run_closure1.doCall(Checkstyle.groovy:142)
    at org.gradle.api.internal.ClosureBackedAction.execute(ClosureBackedAction.java:67)
    at org.gradle.util.ConfigureUtil.configure(ConfigureUtil.java:130)
    at org.gradle.util.ConfigureUtil.configure(ConfigureUtil.java:91)
    at org.gradle.util.ConfigureUtil$configure.call(Unknown Source)
    at org.gradle.api.internal.project.DefaultIsolatedAntBuilder.execute(DefaultIsolatedAntBuilder.groovy:108)
    at org.gradle.api.internal.project.IsolatedAntBuilder$execute$0.call(Unknown Source)
    at org.gradle.api.plugins.quality.Checkstyle.run(Checkstyle.groovy:139)
    at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:75)
    at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.doExecute(AnnotationProcessingTaskFactory.java:226)
    at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.execute(AnnotationProcessingTaskFactory.java:219)
    at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.execute(AnnotationProcessingTaskFactory.java:208)
    at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:585)
    at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:568)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeAction(ExecuteActionsTaskExecuter.java:80)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:61)
    ... 14 more
Caused by: java.lang.NullPointerException
    at com.puppycrawl.tools.checkstyle.api.AutomaticBean.configure(AutomaticBean.java:128)
    at com.puppycrawl.tools.checkstyle.CheckStyleTask.createChecker(CheckStyleTask.java:353)

Config:

checkstyle {
    toolVersion '6.7' //We can't go above this until Gradle 2.7 https://issues.gradle.org/browse/GRADLE-3314
    configFile project.rootProject.file('checkstylefilter.xml')
    ignoreFailures true
    showViolations false
}
2

What’s the contents of checkstylefilter.xml? Does it define a SuppressionFilter with a path relative to checkstylefilter.xml?

Are you using the same version of Checkstyle with Ant?

3

The only thing in the configuration is suppression elements. I’m using version 6.4.1 with Ant, but using that version with gradle gives the same error as reported above with 6.7.

<?xml version="1.0"?>

<!DOCTYPE suppressions PUBLIC
    "-//Puppy Crawl//DTD Suppressions 1.1//EN"
    "http://www.puppycrawl.com/dtds/suppressions_1_1.dtd">

<suppressions>
    <suppress files=".*[\\/]com[\\/]leanlogistics[\\/]custom[\\/]ws[\\/].*" checks=".*"/>
    ... (several more, all similar to above)
</suppressions>
4

I’m brain dead, this is included by another file and I’m using the wrong one. Sorry for the hassle.