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java.lang.NullPointerException: 	at java.lang.String.compareTo(Unknown Source)	at vdo.epi.hibernate.Elemaction.compareTo(Elemaction.java:491)	at java.util.TreeMap.compare(Unknown Source)	at java.util.TreeMap.put(Unknown Source)	at java.util.TreeSet.add(Unknown Source)	at org.hibernate.collection.PersistentSet.initializeFromCache(PersistentSet.java:104)	at org.hibernate.cache.entry.CollectionCacheEntry.assemble(CollectionCacheEntry.java:35)	at org.hibernate.event.def.DefaultInitializeCollectionEventListener.initializeCollectionFromCache(DefaultInitializeCollectionEventListener.java:130)	at org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:48)	at org.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:1716)	at org.hibernate.collection.AbstractPersistentCollection.forceInitialization(AbstractPersistentCollection.java:454)	at org.hibernate.engine.StatefulPersistenceContext.initializeNonLazyCollections(StatefulPersistenceContext.java:755)	at org.hibernate.event.def.DefaultLoadEventListener.assembleCacheEntry(DefaultLoadEventListener.java:567)	at org.hibernate.event.def.DefaultLoadEventListener.loadFromSecondLevelCache(DefaultLoadEventListener.java:494)	at org.hibernate.event.def.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:356)	at org.hibernate.event.def.DefaultLoadEventListener.load(DefaultLoadEventListener.java:137)	at org.hibernate.event.def.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:193)	at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:101)	at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:878)	at org.hibernate.impl.SessionImpl.internalLoad(SessionImpl.java:846)	at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:266)	at org.hibernate.type.ManyToOneType.assemble(ManyToOneType.java:196)	at org.hibernate.type.TypeFactory.assemble(TypeFactory.java:404)	at org.hibernate.cache.entry.CacheEntry.assemble(CacheEntry.java:96)	at org.hibernate.cache.entry.CacheEntry.assemble(CacheEntry.java:82)	at org.hibernate.event.def.DefaultLoadEventListener.assembleCacheEntry(DefaultLoadEventListener.java:540)	at org.hibernate.event.def.DefaultLoadEventListener.loadFromSecondLevelCache(DefaultLoadEventListener.java:494)	at org.hibernate.event.def.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:356)	at org.hibernate.event.def.DefaultLoadEventListener.load(DefaultLoadEventListener.java:137)	at org.hibernate.event.def.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:193)	at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:101)	at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:878)	at org.hibernate.impl.SessionImpl.get(SessionImpl.java:815)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at org.hibernate.context.ThreadLocalSessionContext$TransactionProtectionWrapper.invoke(ThreadLocalSessionContext.java:301)	at $Proxy3.get(Unknown Source)	at vdo.epi.hibernate.ElemactionDAO.findById(ElemactionDAO.java:159)	at vdo.epi.page.ActioncreaPage.onEditElem(ActioncreaPage.java:424)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at net.sf.click.util.ClickUtils.invokeListener(ClickUtils.java:1393)	at net.sf.click.control.ActionLink.onProcess(ActionLink.java:498)	at net.sf.click.ClickServlet.processPage(ClickServlet.java:555)	at net.sf.click.ClickServlet.handleRequest(ClickServlet.java:356)	at net.sf.click.ClickServlet.doGet(ClickServlet.java:284)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:174)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:151)	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:874)	at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)	at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)	at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)	at java.lang.Thread.run(Unknown Source)