java.lang.NullPointerException: null
        at java.util.TreeSet.addAll(TreeSet.java:300) ~[na:1.7.0_111]
        at java.util.TreeSet.<init>(TreeSet.java:160) ~[na:1.7.0_111]
        at com.univ.utils.ContexteUniv.initialiserInfosUtilisateur(ContexteUniv.java:729) ~[ContexteUniv.class:na]
        at com.univ.utils.ContexteUtil.setContexteUniv(ContexteUtil.java:60) ~[ContexteUtil.class:na]
        at com.univ.utils.filter.ContexteFilter.doFilter(ContexteFilter.java:50) ~[ContexteFilter.class:na]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) ~[tomcat8-catalina-8.0.14.jar:8.0.14]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) ~[tomcat8-catalina-8.0.14.jar:8.0.14]
        at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:721) [tomcat8-catalina-8.0.14.jar:8.0.14]
        at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:468) [tomcat8-catalina-8.0.14.jar:8.0.14]
        at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:391) [tomcat8-catalina-8.0.14.jar:8.0.14]
        at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:318) [tomcat8-catalina-8.0.14.jar:8.0.14]
        at org.apache.catalina.core.StandardHostValve.custom(StandardHostValve.java:433) [tomcat8-catalina-8.0.14.jar:8.0.14]
        at org.apache.catalina.core.StandardHostValve.status(StandardHostValve.java:299) [tomcat8-catalina-8.0.14.jar:8.0.14]
        at org.apache.catalina.core.StandardHostValve.throwable(StandardHostValve.java:393) [tomcat8-catalina-8.0.14.jar:8.0.14]
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:174) [tomcat8-catalina-8.0.14.jar:8.0.14]
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) [tomcat8-catalina-8.0.14.jar:8.0.14]
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) [tomcat8-catalina-8.0.14.jar:8.0.14]
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:537) [tomcat8-catalina-8.0.14.jar:8.0.14]
        at org.apache.coyote.ajp.AbstractAjpProcessor.process(AbstractAjpProcessor.java:827) [tomcat8-coyote-8.0.14.jar:8.0.14]
        at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:658) [tomcat8-coyote-8.0.14.jar:8.0.14]
        at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1566) [tomcat8-coyote-8.0.14.jar:8.0.14]
        at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1523) [tomcat8-coyote-8.0.14.jar:8.0.14]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [na:1.7.0_111]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [na:1.7.0_111]
        at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat8-util-8.0.14.jar:8.0.14]
        at java.lang.Thread.run(Thread.java:745) [na:1.7.0_111]