checkstyle module property "severity=warning" causes mvn checkstyle:checkstyle 
error
------------------------------------------------------------------------------------

         Key: MCHECKSTYLE-32
         URL: http://jira.codehaus.org/browse/MCHECKSTYLE-32
     Project: Maven 2.x Checkstyle Plugin
        Type: Bug

    Versions: 2.0-beta-2    
 Environment: j2sdk1.4.2_02, windows xp
    Reporter: Artur Opala


Custom checkstyle config:
...
<module name="AvoidStarImport">
       <property name="severity" value="warning"/>
 </module>
...
executed with mvn checkstyle:checkstyle generates error:

[DEBUG] maven-checkstyle-plugin: resolved to version 
2.0-beta-2-20051230.164525-2 from repository snapshots
[DEBUG] Retrieving parent-POM from the repository for project: 
null:maven-checkstyle-plugin:maven-plugin:2.0-beta-2-20051230.164525-2
[INFO] 
----------------------------------------------------------------------------
[INFO] Building ****
[INFO]    task-segment: [checkstyle:checkstyle]
[INFO] 
----------------------------------------------------------------------------
[DEBUG] 
org.apache.maven.plugins:maven-checkstyle-plugin:maven-plugin:2.0-beta-2-20051230.164525-2
 (selected for runtime)
[DEBUG] Retrieving parent-POM from the repository for project: 
org.apache.maven:maven-plugin-api:jar:2.0.1
[DEBUG]   org.apache.maven:maven-plugin-api:jar:2.0.1 (selected for runtime)
[DEBUG]   org.codehaus.plexus:plexus-utils:jar:1.0.4 (selected for runtime)
[DEBUG]   checkstyle:checkstyle-optional:jar:4.1 (selected for runtime)
[DEBUG]     checkstyle:checkstyle:jar:4.1 (selected for runtime)
[DEBUG]       commons-logging:commons-logging:jar:1.0.3 (selected for runtime)
[DEBUG]         logkit:logkit:jar:1.0.1 (selected for runtime)
[DEBUG]         log4j:log4j:jar:1.2.6 (selected for runtime)
[DEBUG]       commons-beanutils:commons-beanutils-core:jar:1.7.0 (selected for 
runtime)
[DEBUG]         commons-logging:commons-logging:jar:1.0 (removed - nearer 
found: 1.0.3)
[DEBUG]         commons-collections:commons-collections:jar:2.0 (selected for 
runtime)
[DEBUG]       antlr:antlr:jar:2.7.2 (selected for runtime)
[DEBUG]       commons-collections:commons-collections:jar:2.0 (removed - nearer 
found: 2.1)
[DEBUG]       commons-collections:commons-collections:jar:2.1 (selected for 
runtime)
[DEBUG]   org.codehaus.plexus:plexus-velocity:jar:1.1.2 (selected for runtime)
[DEBUG] Retrieving parent-POM from the repository for project: 
org.codehaus.plexus:plexus-container-default:jar:1.0-alpha-7
[DEBUG] Retrieving parent-POM from the repository for project: 
plexus:plexus-containers:pom:1.0.2
[DEBUG]     org.codehaus.plexus:plexus-container-default:jar:1.0-alpha-7 
(selected for runtime)
[DEBUG]       classworlds:classworlds:jar:1.1-alpha-2 (selected for runtime)
[DEBUG]       junit:junit:jar:3.8.1 (selected for runtime)
[DEBUG]     commons-logging:commons-logging-api:jar:1.0.4 (selected for runtime)
[DEBUG]     commons-collections:commons-collections:jar:2.1 (removed - nearer 
found: 2.0)
[DEBUG]     commons-collections:commons-collections:jar:2.0 (selected for 
runtime)
[DEBUG]     classworlds:classworlds:jar:1.1-alpha-2 (selected for runtime)
[DEBUG]     velocity:velocity:jar:1.4 (selected for runtime)
[DEBUG]       velocity:velocity-dep:jar:1.4 (selected for runtime)
[DEBUG]   log4j:log4j:jar:1.2.6 (removed - nearer found: 1.2.12)
[DEBUG]   log4j:log4j:jar:1.2.12 (selected for runtime)
[DEBUG]   checkstyle:checkstyle:jar:4.1 (selected for runtime)
[DEBUG]     commons-logging:commons-logging:jar:1.0.3 (selected for runtime)
[DEBUG]       logkit:logkit:jar:1.0.1 (selected for runtime)
[DEBUG]       log4j:log4j:jar:1.2.6 (removed - nearer found: 1.2.12)
[DEBUG]     commons-beanutils:commons-beanutils-core:jar:1.7.0 (selected for 
runtime)
[DEBUG]       commons-logging:commons-logging:jar:1.0 (removed - nearer found: 
1.0.3)
[DEBUG]     antlr:antlr:jar:2.7.2 (selected for runtime)
[DEBUG]     commons-collections:commons-collections:jar:2.1 (removed - nearer 
found: 2.0)
[DEBUG] Retrieving parent-POM from the repository for project: 
null:maven-reporting-impl:jar:2.0
[DEBUG] Retrieving parent-POM from the repository for project: 
org.apache.maven.reporting:maven-reporting:pom:2.0
[DEBUG]   org.apache.maven.reporting:maven-reporting-impl:jar:2.0 (selected for 
runtime)
[DEBUG] Retrieving parent-POM from the repository for project: 
null:maven-project:jar:2.0
[DEBUG]     org.apache.maven:maven-project:jar:2.0 (selected for runtime)
[DEBUG]       org.codehaus.plexus:plexus-container-default:jar:1.0-alpha-8 
(removed - nearer found: 1.0-alpha-7)
[DEBUG] Retrieving parent-POM from the repository for project: 
org.apache.maven:maven-artifact:jar:2.0
[DEBUG]       org.apache.maven:maven-artifact:jar:2.0 (selected for runtime)
[DEBUG] Retrieving parent-POM from the repository for project: 
org.apache.maven:maven-model:jar:2.0
[DEBUG]       org.apache.maven:maven-model:jar:2.0 (selected for runtime)
[DEBUG] Retrieving parent-POM from the repository for project: 
org.apache.maven:maven-artifact-manager:jar:2.0
[DEBUG]       org.apache.maven:maven-artifact-manager:jar:2.0 (selected for 
runtime)
[DEBUG]         org.codehaus.plexus:plexus-container-default:jar:1.0-alpha-8 
(removed - nearer found: 1.0-alpha-7)
[DEBUG] Retrieving parent-POM from the repository for project: 
org.apache.maven:maven-repository-metadata:jar:2.0
[DEBUG]         org.apache.maven:maven-repository-metadata:jar:2.0 (selected 
for runtime)
[DEBUG]         org.apache.maven.wagon:wagon-provider-api:jar:1.0-alpha-5 
(selected for runtime)
[DEBUG] Retrieving parent-POM from the repository for project: 
null:maven-profile:jar:2.0
[DEBUG]       org.apache.maven:maven-profile:jar:2.0 (selected for runtime)
[DEBUG]         org.codehaus.plexus:plexus-container-default:jar:1.0-alpha-8 
(removed - nearer found: 1.0-alpha-7)
[DEBUG] Retrieving parent-POM from the repository for project: 
null:maven-reporting-api:jar:2.0
[DEBUG] Retrieving parent-POM from the repository for project: 
org.apache.maven.reporting:maven-reporting:pom:2.0
[DEBUG]     org.apache.maven.reporting:maven-reporting-api:jar:2.0 (selected 
for runtime)
[DEBUG]       doxia:doxia-sink-api:jar:1.0-alpha-4 (selected for runtime)
[DEBUG]     commons-validator:commons-validator:jar:1.1.4 (selected for runtime)
[DEBUG] Retrieving parent-POM from the repository for project: 
org.apache.maven:maven-plugin-api:jar:2.0
[DEBUG]     org.apache.maven:maven-plugin-api:jar:2.0 (removed - nearer found: 
2.0.1)
[DEBUG]     oro:oro:jar:2.0.7 (selected for runtime)
[DEBUG]     doxia:doxia-core:jar:1.0-alpha-4 (selected for runtime)
[INFO] Setting property: classpath.resource.loader.class => 
'org.codehaus.plexus.velocity.ContextClassLoaderResourceLoader'.
[INFO] Setting property: velocimacro.messages.on => 'false'.
[INFO] Setting property: resource.loader => 'classpath'.
[INFO] Setting property: resource.manager.logwhenfound => 'false'.
[INFO] ************************************************************** 
[INFO] Starting Jakarta Velocity v1.4
[INFO] RuntimeInstance initializing.
[INFO] Default Properties File: 
org\apache\velocity\runtime\defaults\velocity.properties
[INFO] Default ResourceManager initializing. (class 
org.apache.velocity.runtime.resource.ResourceManagerImpl)
[INFO] Resource Loader Instantiated: 
org.codehaus.plexus.velocity.ContextClassLoaderResourceLoader
[INFO] ClasspathResourceLoader : initialization starting.
[INFO] ClasspathResourceLoader : initialization complete.
[INFO] ResourceCache : initialized. (class 
org.apache.velocity.runtime.resource.ResourceCacheImpl)
[INFO] Default ResourceManager initialization complete.
[INFO] Loaded System Directive: org.apache.velocity.runtime.directive.Literal
[INFO] Loaded System Directive: org.apache.velocity.runtime.directive.Macro
[INFO] Loaded System Directive: org.apache.velocity.runtime.directive.Parse
[INFO] Loaded System Directive: org.apache.velocity.runtime.directive.Include
[INFO] Loaded System Directive: org.apache.velocity.runtime.directive.Foreach
[INFO] Created: 20 parsers.
[INFO] Velocimacro : initialization starting.
[INFO] Velocimacro : adding VMs from VM library template : VM_global_library.vm
[ERROR] ResourceManager : unable to find resource 'VM_global_library.vm' in any 
resource loader.
[INFO] Velocimacro : error using  VM library template VM_global_library.vm : 
org.apache.velocity.exception.ResourceNotFoundException: Unable to find 
resource 'VM_global_library.vm'
[INFO] Velocimacro :  VM library template macro registration complete.
[INFO] Velocimacro : allowInline = true : VMs can be defined inline in templates
[INFO] Velocimacro : allowInlineToOverride = false : VMs defined inline may NOT 
replace previous VM definitions
[INFO] Velocimacro : allowInlineLocal = false : VMs defined inline will be  
global in scope if allowed.
[INFO] Velocimacro : initialization complete.
[INFO] Velocity successfully started.
[DEBUG] Configuring mojo 
'org.apache.maven.plugins:maven-checkstyle-plugin:2.0-beta-2-SNAPSHOT:checkstyle'
 -->
[DEBUG]   (f) cacheFile = ****
[DEBUG]   (f) configLocation = src/main/config/checkstyle-checker.xml
[DEBUG]   (f) enableFilesSummary = true
[DEBUG]   (f) enableRSS = true
[DEBUG]   (f) enableRulesSummary = true
[DEBUG]   (f) enableSeveritySummary = true
[DEBUG]   (f) failsOnError = false
[DEBUG]   (f) format = sun
[DEBUG]   (f) headerFile = ****
[DEBUG]   (f) headerLocation = LICENSE.txt
[DEBUG]   (f) includes = **/*.java
[DEBUG]   (f) outputDirectory = ****
[DEBUG]   (f) outputFile = ****
[DEBUG]   (f) outputFileFormat = xml
[DEBUG]   (f) project = [EMAIL PROTECTED]
[DEBUG]   (f) sourceDirectory = ****
[DEBUG] -- end configuration --
[INFO] [checkstyle:checkstyle]
[DEBUG] resolveLocation(src/main/config/checkstyle-checker.xml, 
checkstyle-checker.xml)
[DEBUG] Location is not a URL.
[DEBUG] Potential File: 
p:\workspace\eb-ubik-prototyp\aplikacja\src\main\config\checkstyle-checker.xml
[DEBUG] resolveLocation(null, checkstyle-checker.properties)
[DEBUG] resolveLocation(LICENSE.txt, checkstyle-header.txt)
[DEBUG] Location is not a URL.
[DEBUG] Location is not a File.
[DEBUG] Potential Resource: 
jar:file:/c:/app/maven-2.0.2/lib/jsch-0.1.24.jar!/LICENSE.txt
[DEBUG] resolveLocation(null, checkstyle-packages.xml)
[DEBUG] resolveLocation(null, checkstyle-suppressions.xml)
[INFO] Starting audit...
Audit done.

[INFO] 
----------------------------------------------------------------------------
[ERROR] BUILD ERROR
[INFO] 
----------------------------------------------------------------------------
[INFO] An error has occurred in Checkstyle report generation.

[INFO] 
----------------------------------------------------------------------------
[DEBUG] Trace
org.apache.maven.lifecycle.LifecycleExecutionException: An error has occurred 
in Checkstyle report generation.
        at 
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:556)
        at 
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeStandaloneGoal(DefaultLifecycleExecutor.java:485)
        at 
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:455)
        at 
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:303)
        at 
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:270)
        at 
org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:139)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:322)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:115)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:249)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:324)
        at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
        at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
        at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
        at org.codehaus.classworlds.Launcher.main(Launcher.java:375)
Caused by: org.apache.maven.plugin.MojoExecutionException: An error has 
occurred in Checkstyle report generation.
        at 
org.apache.maven.reporting.AbstractMavenReport.execute(AbstractMavenReport.java:79)
        at 
org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:415)
        at 
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:531)
        ... 16 more
Caused by: java.lang.UnsupportedOperationException
        at java.util.AbstractList.remove(AbstractList.java:171)
        at java.util.AbstractList$Itr.remove(AbstractList.java:436)
        at java.util.AbstractCollection.remove(AbstractCollection.java:255)
        at 
org.apache.maven.plugin.checkstyle.CheckstyleReportGenerator.doRuleRow(CheckstyleReportGenerator.java:294)
        at 
org.apache.maven.plugin.checkstyle.CheckstyleReportGenerator.doRuleChildren(CheckstyleReportGenerator.java:282)
        at 
org.apache.maven.plugin.checkstyle.CheckstyleReportGenerator.doRuleChildren(CheckstyleReportGenerator.java:278)
        at 
org.apache.maven.plugin.checkstyle.CheckstyleReportGenerator.doRulesSummary(CheckstyleReportGenerator.java:252)
        at 
org.apache.maven.plugin.checkstyle.CheckstyleReportGenerator.generateReport(CheckstyleReportGenerator.java:107)
        at 
org.apache.maven.plugin.checkstyle.CheckstyleReport.generateMainReport(CheckstyleReport.java:567)
        at 
org.apache.maven.plugin.checkstyle.CheckstyleReport.executeReport(CheckstyleReport.java:474)
        at 
org.apache.maven.reporting.AbstractMavenReport.generate(AbstractMavenReport.java:98)
        at 
org.apache.maven.reporting.AbstractMavenReport.execute(AbstractMavenReport.java:73)
        ... 18 more

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