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Showing content from https://github.com/pmd/pmd/issues/1721 below:

[doc] Documentation provides an invalid property configuration example · Issue #1721 · pmd/pmd · GitHub

Scope

Affects PMD version: 5.12.0

Rule: any

Description

When a numerical property of a rule is changed by placing the value inside the property tag rather than setting it as the value attribute (as shown in the user documentation), a NumberFormatException is thrown.

Erroneous sample

The following throws an exception:

<rule ref="category/java/documentation.xml/CommentSize">
    <properties>
        <property name="maxLines">120</property>
    </properties>
</rule>

The same happens with other numerical properties and rules. Booleans and strings work as intended.

Click here for the stacktrace 
$> gradlew pmdMain --stacktrace
> Task :pmdMain FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':pmdMain'.
> java.lang.NumberFormatException: null

* Try:
Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Exception is:
org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':pmdMain'.
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$2.accept(ExecuteActionsTaskExecu
ter.java:121)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$2.accept(ExecuteActionsTaskExecu
ter.java:117)
        at org.gradle.internal.Try$Failure.ifSuccessfulOrElse(Try.java:184)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecut
er.java:110)
        at org.gradle.api.internal.tasks.execution.ResolveIncrementalChangesTaskExecuter.execute(ResolveIncrem
entalChangesTaskExecuter.java:84)
        at org.gradle.api.internal.tasks.execution.ResolveTaskOutputCachingStateExecuter.execute(ResolveTaskOu
tputCachingStateExecuter.java:91)
        at org.gradle.api.internal.tasks.execution.ResolveBeforeExecutionStateTaskExecuter.execute(ResolveBefo
reExecutionStateTaskExecuter.java:74)
        at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:
58)
        at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFil
esTaskExecuter.java:109)
        at org.gradle.api.internal.tasks.execution.ResolveBeforeExecutionOutputsTaskExecuter.execute(ResolveBe
foreExecutionOutputsTaskExecuter.java:67)
        at org.gradle.api.internal.tasks.execution.ResolveAfterPreviousExecutionStateTaskExecuter.execute(Reso
lveAfterPreviousExecutionStateTaskExecuter.java:46)
        at org.gradle.api.internal.tasks.execution.CleanupStaleOutputsExecuter.execute(CleanupStaleOutputsExec
uter.java:93)
        at org.gradle.api.internal.tasks.execution.FinalizePropertiesTaskExecuter.execute(FinalizePropertiesTa
skExecuter.java:45)
        at org.gradle.api.internal.tasks.execution.ResolveTaskExecutionModeExecuter.execute(ResolveTaskExecuti
onModeExecuter.java:94)
        at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActions
Executer.java:57)
        at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:
56)
        at org.gradle.api.internal.tasks.execution.CatchExceptionTaskExecuter.execute(CatchExceptionTaskExecut
er.java:36)
        at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.executeTask(EventFiringTaskExecut
er.java:63)
        at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java
:49)
        at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java
:46)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(D
efaultBuildOperationExecutor.java:416)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(D
efaultBuildOperationExecutor.java:406)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$1.execute(DefaultBuildOperationExecuto
r.java:165)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.
java:250)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.
java:158)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.call(DefaultBuildOperationExecutor.jav
a:102)
        at org.gradle.internal.operations.DelegatingBuildOperationExecutor.call(DelegatingBuildOperationExecut
or.java:36)
        at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter.execute(EventFiringTaskExecuter.jav
a:46)
        at org.gradle.execution.plan.LocalTaskNodeExecutor.execute(LocalTaskNodeExecutor.java:43)
        at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultT
askExecutionGraph.java:355)
        at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultT
askExecutionGraph.java:343)
        at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute
(DefaultTaskExecutionGraph.java:336)
        at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute
(DefaultTaskExecutionGraph.java:322)
        at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker$1.execute(DefaultPlanExecutor.java:134
)
        at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker$1.execute(DefaultPlanExecutor.java:129
)
        at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.execute(DefaultPlanExecutor.java:202)
        at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.executeNextNode(DefaultPlanExecutor.ja
va:193)
        at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.run(DefaultPlanExecutor.java:129)
        at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:
63)
        at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:46)
        at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:5
5)
Caused by: : java.lang.NumberFormatException: null
        at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:116)
        at org.gradle.api.internal.project.ant.BasicAntBuilder.nodeCompleted(BasicAntBuilder.java:78)
        at org.gradle.internal.metaobject.BeanDynamicObject$MetaClassAdapter.invokeMethod(BeanDynamicObject.ja
va:479)
        at org.gradle.internal.metaobject.BeanDynamicObject.tryInvokeMethod(BeanDynamicObject.java:191)
        at org.gradle.internal.metaobject.AbstractDynamicObject.invokeMethod(AbstractDynamicObject.java:160)
        at org.gradle.api.internal.project.antbuilder.AntBuilderDelegate.nodeCompleted(AntBuilderDelegate.java
:118)
        at org.gradle.api.plugins.quality.internal.PmdInvoker$_invoke_closure3.doCall(PmdInvoker.groovy:70)
        at org.gradle.util.ClosureBackedAction.execute(ClosureBackedAction.java:70)
        at org.gradle.util.ClosureBackedAction.execute(ClosureBackedAction.java:52)
        at org.gradle.api.internal.project.antbuilder.DefaultIsolatedAntBuilder$2.execute(DefaultIsolatedAntBu
ilder.java:152)
        at org.gradle.api.internal.project.antbuilder.DefaultIsolatedAntBuilder$2.execute(DefaultIsolatedAntBu
ilder.java:134)
        at org.gradle.api.internal.project.antbuilder.ClassPathToClassLoaderCache.withCachedClassLoader(ClassP
athToClassLoaderCache.java:134)
        at org.gradle.api.internal.project.antbuilder.DefaultIsolatedAntBuilder.execute(DefaultIsolatedAntBuil
der.java:128)
        at org.gradle.api.internal.project.IsolatedAntBuilder$execute$0.call(Unknown Source)
        at org.gradle.api.plugins.quality.internal.PmdInvoker.invoke(PmdInvoker.groovy:68)
        at org.gradle.api.plugins.quality.Pmd.run(Pmd.java:86)
        at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:103)
        at org.gradle.api.internal.project.taskfactory.StandardTaskAction.doExecute(StandardTaskAction.java:48
)
        at org.gradle.api.internal.project.taskfactory.StandardTaskAction.execute(StandardTaskAction.java:41)
        at org.gradle.api.internal.project.taskfactory.StandardTaskAction.execute(StandardTaskAction.java:28)
        at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:705)
        at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:672)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$4.run(ExecuteActionsTaskExecuter
.java:338)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(D
efaultBuildOperationExecutor.java:402)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(D
efaultBuildOperationExecutor.java:394)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$1.execute(DefaultBuildOperationExecuto
r.java:165)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.
java:250)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.
java:158)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java
:92)
        at org.gradle.internal.operations.DelegatingBuildOperationExecutor.run(DelegatingBuildOperationExecuto
r.java:31)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeAction(ExecuteActionsTask
Executer.java:327)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTas
kExecuter.java:312)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.access$200(ExecuteActionsTaskExe
cuter.java:75)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$TaskExecution.execute(ExecuteAct
ionsTaskExecuter.java:158)
        at org.gradle.internal.execution.impl.steps.ExecuteStep.execute(ExecuteStep.java:46)
        at org.gradle.internal.execution.impl.steps.CancelExecutionStep.execute(CancelExecutionStep.java:34)
        at org.gradle.internal.execution.impl.steps.TimeoutStep.executeWithoutTimeout(TimeoutStep.java:69)
        at org.gradle.internal.execution.impl.steps.TimeoutStep.execute(TimeoutStep.java:49)
        at org.gradle.internal.execution.impl.steps.CatchExceptionStep.execute(CatchExceptionStep.java:34)
        at org.gradle.internal.execution.impl.steps.CreateOutputsStep.execute(CreateOutputsStep.java:49)
        at org.gradle.internal.execution.impl.steps.SnapshotOutputStep.execute(SnapshotOutputStep.java:42)
        at org.gradle.internal.execution.impl.steps.SnapshotOutputStep.execute(SnapshotOutputStep.java:28)
        at org.gradle.internal.execution.impl.steps.CacheStep.executeWithoutCache(CacheStep.java:133)
        at org.gradle.internal.execution.impl.steps.CacheStep.lambda$execute$5(CacheStep.java:83)
        at org.gradle.internal.execution.impl.steps.CacheStep.execute(CacheStep.java:82)
        at org.gradle.internal.execution.impl.steps.CacheStep.execute(CacheStep.java:37)
        at org.gradle.internal.execution.impl.steps.PrepareCachingStep.execute(PrepareCachingStep.java:33)
        at org.gradle.internal.execution.impl.steps.StoreSnapshotsStep.execute(StoreSnapshotsStep.java:38)
        at org.gradle.internal.execution.impl.steps.StoreSnapshotsStep.execute(StoreSnapshotsStep.java:23)
        at org.gradle.internal.execution.impl.steps.SkipUpToDateStep.executeBecause(SkipUpToDateStep.java:95)
        at org.gradle.internal.execution.impl.steps.SkipUpToDateStep.lambda$execute$0(SkipUpToDateStep.java:88
)
        at org.gradle.internal.execution.impl.steps.SkipUpToDateStep.execute(SkipUpToDateStep.java:52)
        at org.gradle.internal.execution.impl.steps.SkipUpToDateStep.execute(SkipUpToDateStep.java:36)
        at org.gradle.internal.execution.impl.DefaultWorkExecutor.execute(DefaultWorkExecutor.java:34)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecut
er.java:109)
        ... 37 more
Caused by: java.lang.NumberFormatException: null
        at net.sourceforge.pmd.properties.ValueParserConstants$4.valueOf(ValueParserConstants.java:168)
        at net.sourceforge.pmd.properties.ValueParserConstants$4.valueOf(ValueParserConstants.java:165)
        at net.sourceforge.pmd.properties.GenericPropertyDescriptor.createFrom(GenericPropertyDescriptor.java:
68)
        at net.sourceforge.pmd.properties.AbstractSingleValueProperty.valueFrom(AbstractSingleValueProperty.ja
va:129)
        at net.sourceforge.pmd.rules.RuleFactory.setRulePropertyCapture(RuleFactory.java:284)
        at net.sourceforge.pmd.rules.RuleFactory.setPropertyValues(RuleFactory.java:279)
        at net.sourceforge.pmd.rules.RuleFactory.decorateRule(RuleFactory.java:104)
        at net.sourceforge.pmd.RuleSetFactory.parseRuleReferenceNode(RuleSetFactory.java:634)
        at net.sourceforge.pmd.RuleSetFactory.parseRuleNode(RuleSetFactory.java:452)
        at net.sourceforge.pmd.RuleSetFactory.parseRuleSetNode(RuleSetFactory.java:367)
        at net.sourceforge.pmd.RuleSetFactory.createRuleSet(RuleSetFactory.java:214)
        at net.sourceforge.pmd.RuleSetFactory.createRuleSet(RuleSetFactory.java:209)
        at net.sourceforge.pmd.RuleSetFactory.createRuleSets(RuleSetFactory.java:170)
        at net.sourceforge.pmd.RuleSetFactory.createRuleSets(RuleSetFactory.java:154)
        at net.sourceforge.pmd.ant.internal.PMDTaskImpl.doTask(PMDTaskImpl.java:116)
        at net.sourceforge.pmd.ant.internal.PMDTaskImpl.execute(PMDTaskImpl.java:275)
        at net.sourceforge.pmd.ant.PMDTask.execute(PMDTask.java:50)
        at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:293)
        at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
        ... 91 more


* Get more help at https://help.gradle.org

Deprecated Gradle features were used in this build, making it incompatible with Gradle 6.0.
Use '--warning-mode all' to show the individual deprecation warnings.
See https://docs.gradle.org/5.2.1/userguide/command_line_interface.html#sec:command_line_warnings

BUILD FAILED in 4s
6 actionable tasks: 2 executed, 4 up-to-date
Workaround

The following does not throw an exception:

<rule ref="category/java/documentation.xml/CommentSize">
    <properties>
        <property name="maxLines" value="120" />
    </properties>
</rule>
Environment

Running PMD through: Gradle 5.2.1

JDK version: 1.8.0_201

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