Jenkins Maven Job fails

gistfile1.txt

copy managed file [MySettings] to file:/srv/webapps/jenkins/jobs/acceptance2/workspace@tmp/config2078458608718971600tmp
Parsing POMs
Established TCP socket on 35612
[workspace] $ java -Xms128m -Xmx2048m -cp /srv/webapps/jenkins/plugins/maven-plugin/WEB-INF/lib/maven3-agent-1.11.jar:/srv/webapps/jenkins/tools/hudson.tasks.Maven_MavenInstallation/Jenkins_maven/boot/plexus-classworlds-2.4.jar org.jvnet.hudson.maven3.agent.Maven3Main /srv/webapps/jenkins/tools/hudson.tasks.Maven_MavenInstallation/Jenkins_maven /var/lib/tomcat7/webapps/jenkins/WEB-INF/lib/remoting-3.7.jar /srv/webapps/jenkins/plugins/maven-plugin/WEB-INF/lib/maven3-interceptor-1.11.jar /srv/webapps/jenkins/plugins/maven-plugin/WEB-INF/lib/maven3-interceptor-commons-1.11.jar 35612
Exception in thread "main" java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.jvnet.hudson.maven3.agent.Maven3Main.main(Maven3Main.java:140)
	at org.jvnet.hudson.maven3.agent.Maven3Main.main(Maven3Main.java:70)
Caused by: java.lang.RuntimeException: Root directory not writable: /usr/share/tomcat7/.jenkins/cache/jars
	at hudson.remoting.FileSystemJarCache.<init>(FileSystemJarCache.java:53)
	at hudson.remoting.Launcher.main(Launcher.java:638)
	at hudson.remoting.Launcher.main(Launcher.java:629)
	at hudson.remoting.Launcher.main(Launcher.java:625)
	... 6 more
ERROR: ================================================================================
ERROR: Invalid project setup: Connection reset
Deleting 1 temporary files
ERROR: Processing failed due to a bug in the code. Please report this to the issue tracker (https://jenkins.io/redirect/report-an-issue).
java.lang.NullPointerException
	at hudson.maven.AbstractMavenProcessFactory.newProcess(AbstractMavenProcessFactory.java:304)
	at hudson.maven.ProcessCache.get(ProcessCache.java:236)
	at hudson.maven.MavenModuleSetBuild$MavenModuleSetBuildExecution.doRun(MavenModuleSetBuild.java:803)
	at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:490)
	at hudson.model.Run.execute(Run.java:1735)
	at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:542)
	at hudson.model.ResourceController.execute(ResourceController.java:97)
	at hudson.model.Executor.run(Executor.java:405)
project=hudson.maven.MavenModuleSet@68100d7f[acceptance2]
project.getModules()=[hudson.maven.MavenModule@1b824c8f[acceptance2/com.itclinical.test:acceptance-cucumber][acceptance2/com.itclinical.test:acceptance-cucumber][relativePath:]]
project.getRootModule()=hudson.maven.MavenModule@1b824c8f[acceptance2/com.itclinical.test:acceptance-cucumber][acceptance2/com.itclinical.test:acceptance-cucumber][relativePath:]
FATAL: null
java.lang.NullPointerException
	at hudson.maven.AbstractMavenProcessFactory.newProcess(AbstractMavenProcessFactory.java:304)
	at hudson.maven.ProcessCache.get(ProcessCache.java:236)
	at hudson.maven.MavenModuleSetBuild$MavenModuleSetBuildExecution.doRun(MavenModuleSetBuild.java:803)
	at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:490)
	at hudson.model.Run.execute(Run.java:1735)
	at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:542)
	at hudson.model.ResourceController.execute(ResourceController.java:97)
	at hudson.model.Executor.run(Executor.java:405)
Finished: FAILURE