PMD doesn't support JDK 1.1 parameter

Stacktrace from the commons-lang project :

[INFO] ------------------------------------------------------------------------
[INFO] Building Commons Lang
[INFO] task-segment: [org.apache.maven.plugins:maven-pmd-plugin:2.3:pmd]
[INFO] ------------------------------------------------------------------------
[INFO] [pmd:pmd]
[ERROR] Cannot execute the command org.apache.maven.plugins:maven-pmd-plugin:2.3:pmd
org.apache.maven.lifecycle.LifecycleExecutionException: An error has occurred in Rapport PMD report generation.
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:564)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeStandaloneGoal(DefaultLifecycleExecutor.java:493)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:463)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:311)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:278)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:143)
at ch.hortis.sonar.mvn.SonarMavenEmbedder.execute(SonarMavenEmbedder.java:157)
at ch.hortis.sonar.mvn.SonarMavenEmbedder.execute(SonarMavenEmbedder.java:121)
at ch.hortis.sonar.mvn.SonarMojo.executeMaven(SonarMojo.java:234)
at ch.hortis.sonar.mvn.SonarMojo.executeGoals(SonarMojo.java:198)
at ch.hortis.sonar.mvn.SonarMojo.execute(SonarMojo.java:102)
at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:447)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:539)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeStandaloneGoal(DefaultLifecycleExecutor.java:493)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:463)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:311)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:224)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:143)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:333)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:126)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:282)
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:597)
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 Rapport PMD report generation.
at org.apache.maven.reporting.AbstractMavenReport.execute(AbstractMavenReport.java:79)
at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:447)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:539)
... 28 more
Caused by: org.apache.maven.reporting.MavenReportException: Unsupported targetJdk value '1.1'.
at org.apache.maven.plugin.pmd.PmdReport.getPMD(PmdReport.java:344)
at org.apache.maven.plugin.pmd.PmdReport.executeReport(PmdReport.java:157)
at org.apache.maven.reporting.AbstractMavenReport.generate(AbstractMavenReport.java:98)
at org.apache.maven.reporting.AbstractMavenReport.execute(AbstractMavenReport.java:73)
... 30 more
[INFO] ------------------------------------------------------------------------
[ERROR] BUILD ERROR
[INFO] ------------------------------------------------------------------------
[INFO] Cannot execute the command org.apache.maven.plugins:maven-pmd-plugin:2.3:pmd

Embedded error: An error has occurred in Rapport PMD report generation.
Unsupported targetJdk value '1.1'.
[INFO] ------------------------------------------------------------------------
[INFO] For more information, run Maven with the -e switch
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1 minute 25 seconds
[INFO] Finished at: Mon Feb 11 10:32:36 CET 2008
[INFO] Final Memory: 8M/35M
[INFO] ------------------------------------------------------------------------