Build failed in Jenkins: Hama-Nightly #258

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See <https://builds.apache.org/job/Hama-Nightly/258/>

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Started by timer
Building remotely on solaris2
Reverting <https://builds.apache.org/job/Hama-Nightly/ws/trunk>
Updating http://svn.apache.org/repos/asf/incubator/hama/trunk
At revision 1147718
no change for http://svn.apache.org/repos/asf/incubator/hama/trunk since the 
previous build
FATAL: A JSONObject text must begin with '{' at character 0 of 
net.sf.json.JSONException: A JSONObject text must begin with '{' at character 0 
of 
        at net.sf.json.util.JSONTokener.syntaxError(JSONTokener.java:512)
        at net.sf.json.JSONObject._fromJSONTokener(JSONObject.java:839)
        at net.sf.json.JSONObject._fromString(JSONObject.java:1060)
        at net.sf.json.JSONObject.fromObject(JSONObject.java:176)
        at net.sf.json.JSONObject.fromObject(JSONObject.java:147)
        at 
hudson.model.DownloadService$Downloadable.getData(DownloadService.java:196)
        at 
hudson.tools.DownloadFromUrlInstaller$DescriptorImpl.getInstallables(DownloadFromUrlInstaller.java:149)
        at 
hudson.tools.DownloadFromUrlInstaller.getInstallable(DownloadFromUrlInstaller.java:54)
        at 
hudson.tools.DownloadFromUrlInstaller.performInstallation(DownloadFromUrlInstaller.java:63)
        at 
hudson.tools.InstallerTranslator.getToolHome(InstallerTranslator.java:61)
        at 
hudson.tools.ToolLocationNodeProperty.getToolHome(ToolLocationNodeProperty.java:106)
        at hudson.tools.ToolInstallation.translateFor(ToolInstallation.java:149)
        at hudson.tasks.Maven$MavenInstallation.forNode(Maven.java:510)
        at hudson.tasks.Maven.perform(Maven.java:234)
        at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:19)
        at 
hudson.model.AbstractBuild$AbstractRunner.perform(AbstractBuild.java:662)
        at hudson.model.Build$RunnerImpl.build(Build.java:177)
        at hudson.model.Build$RunnerImpl.doRun(Build.java:139)
        at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:429)
        at hudson.model.Run.run(Run.java:1374)
        at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
        at hudson.model.ResourceController.execute(ResourceController.java:88)
        at hudson.model.Executor.run(Executor.java:145)