The error message said I should report it here - so, after a couple of google searches failed to turn up anything that looked useful, here I am. Hopefully someone can help; we'd really like to update to the latest version of jenkins.
config file for the project that generates the error (with a few details omitted, as noted in parentheses): <?xml version='1.0' encoding='UTF-8'?> <maven2-moduleset> <actions/> <description></description> <keepDependencies>false</keepDependencies> <properties/> <scm class="hudson.scm.SubversionSCM"> <locations> <hudson.scm.SubversionSCM_-ModuleLocation> <remote>svn+ssh://(URI omitted, but this part seemed to work fine)</remote> <local>studentmon</local> </hudson.scm.SubversionSCM_-ModuleLocation> </locations> <excludedRegions></excludedRegions> <includedRegions></includedRegions> <excludedUsers></excludedUsers> <excludedRevprop></excludedRevprop> <excludedCommitMessages></excludedCommitMessages> <workspaceUpdater class="hudson.scm.subversion.UpdateUpdater"/> </scm> <canRoam>true</canRoam> <disabled>false</disabled> <blockBuildWhenDownstreamBuilding>true</ blockBuildWhenDownstreamBuilding> <blockBuildWhenUpstreamBuilding>true</ blockBuildWhenUpstreamBuilding> <triggers class="vector"> <hudson.triggers.SCMTrigger> <spec>* * * * *</spec> </hudson.triggers.SCMTrigger> </triggers> <concurrentBuild>false</concurrentBuild> <rootModule> <groupId>com.acuitus</groupId> <artifactId>studentmon</artifactId> </rootModule> <goals>clean deploy -e</goals> <aggregatorStyleBuild>true</aggregatorStyleBuild> <incrementalBuild>false</incrementalBuild> <usePrivateRepository>false</usePrivateRepository> <ignoreUpstremChanges>false</ignoreUpstremChanges> <archivingDisabled>false</archivingDisabled> <resolveDependencies>false</resolveDependencies> <processPlugins>false</processPlugins> <mavenValidationLevel>0</mavenValidationLevel> <reporters> <hudson.maven.reporters.MavenMailer> <recipients>(recipients list also omitted)</recipients> <dontNotifyEveryUnstableBuild>true</ dontNotifyEveryUnstableBuild> <sendToIndividuals>true</sendToIndividuals> </hudson.maven.reporters.MavenMailer> </reporters> <publishers/> <buildWrappers/> </maven2-moduleset> Build log: Started by an SCM change Building on master in workspace /usr/share/tomcat6/.hudson/jobs/ studentmon (Maven)/workspace Updating svn+ssh://(URI still omitted) U src/main/java/com/acuitus/studentmon/rtmonitor/gui/ TableColumnMapper.java U src/main/java/com/acuitus/studentmon/rtmonitor/gui/ TableController.java At revision 56904 ERROR: Processing failed due to a bug in the code. Please report this to jenkinsci-users@googlegroups.com ^[[8mha:AAAAWB+LCAAAAAAAAABb85aBtbiIQSmjNKU4P08vOT +vOD8nVc8DzHWtSE4tKMnMz/PLL0ldFVf2c+b/ lb5MDAwVRQxSaBqcITRIIQMEMIIUFgAAckCEiWAAAAA=^[[0mjava.lang.NullPointerException at hudson.tools.ToolInstaller.preferredLocation(ToolInstaller.java:115) at hudson.tools.DownloadFromUrlInstaller.performInstallation(DownloadFromUrlInstaller.java: 61) at hudson.tools.InstallerTranslator.getToolHome(InstallerTranslator.java: 61) at hudson.tools.ToolLocationNodeProperty.getToolHome(ToolLocationNodeProperty.java: 107) at hudson.tools.ToolInstallation.translateFor(ToolInstallation.java:150) at hudson.tasks.Maven$MavenInstallation.forNode(Maven.java: 515) at hudson.maven.MavenModuleSetBuild.getEnvironment(MavenModuleSetBuild.java: 173) at hudson.maven.MavenModuleSetBuild $RunnerImpl.doRun(MavenModuleSetBuild.java:572) at hudson.model.AbstractBuild $AbstractRunner.run(AbstractBuild.java:473) at hudson.model.Run.run(Run.java:1408) at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:481) at hudson.model.ResourceController.execute(ResourceController.java:88) at hudson.model.Executor.run(Executor.java:238) project=hudson.maven.MavenModuleSet@1c515979[studentmon (Maven)] project.getModules()=[hudson.maven.MavenModule@66f34a08[studentmon (Maven)/com.acuitus:studentmon][studentmon (Maven)/ com.acuitus:studentmon][relativePath:]] project.getRootModule()=hudson.maven.MavenModule@66f34a08[studentmon (Maven)/com.acuitus:studentmon][studentmon (Maven)/ com.acuitus:studentmon][relativePath:] FATAL: null ^[[8mha:AAAAWB+LCAAAAAAAAABb85aBtbiIQSmjNKU4P08vOT +vOD8nVc8DzHWtSE4tKMnMz/PLL0ldFVf2c+b/ lb5MDAwVRQxSaBqcITRIIQMEMIIUFgAAckCEiWAAAAA=^[[0mjava.lang.NullPointerException at hudson.tools.ToolInstaller.preferredLocation(ToolInstaller.java:115) at hudson.tools.DownloadFromUrlInstaller.performInstallation(DownloadFromUrlInstaller.java: 61) at hudson.tools.InstallerTranslator.getToolHome(InstallerTranslator.java: 61) at hudson.tools.ToolLocationNodeProperty.getToolHome(ToolLocationNodeProperty.java: 107) at hudson.tools.ToolInstallation.translateFor(ToolInstallation.java:150) at hudson.tasks.Maven$MavenInstallation.forNode(Maven.java: 515) at hudson.maven.MavenModuleSetBuild.getEnvironment(MavenModuleSetBuild.java: 173) at hudson.maven.MavenModuleSetBuild $RunnerImpl.doRun(MavenModuleSetBuild.java:572) at hudson.model.AbstractBuild $AbstractRunner.run(AbstractBuild.java:473) at hudson.model.Run.run(Run.java:1408) at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:481) at hudson.model.ResourceController.execute(ResourceController.java:88) at hudson.model.Executor.run(Executor.java:238)