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    Thrown when an application is trying to use or access an object whose reference equals to null. You are probably trying to use a reference that points to no location in memory as though it were referencing an object.

Solutions on the web

via XWiki.org JIRA by Vincent Massol, 1 year ago
via GitHub by Rekoe
, 2 years ago
This exception has no message.
via grokbase.com by Unknown author, 1 year ago
via Oracle Community by 843833, 1 year ago
This exception has no message.
java.lang.NullPointerException: 	at java.util.Hashtable.put(Hashtable.java:394)	at com.xpn.xwiki.XWikiContext.put(XWikiContext.java:257)	at org.xwiki.component.wiki.WikiComponentInvocationHandler.executeWikiContent(WikiComponentInvocationHandler.java:238)	at org.xwiki.component.wiki.WikiComponentInvocationHandler.invoke(WikiComponentInvocationHandler.java:156)	at undefined.$Proxy43.getDescriptor(Unknown Source)	at org.xwiki.rendering.internal.macro.DefaultMacroCategoryManager.getMacroIdsByCategory(DefaultMacroCategoryManager.java:135)	at org.xwiki.rendering.internal.macro.DefaultMacroCategoryManager.getMacroCategories(DefaultMacroCategoryManager.java:83)	at org.xwiki.wysiwyg.server.internal.plugin.macro.XWikiMacroService.getMacroDescriptors(XWikiMacroService.java:188)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:561)	at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:545)	at org.xwiki.wysiwyg.server.XWikiRemoteServiceServlet.processCall(XWikiRemoteServiceServlet.java:52)	at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:248)	at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:538)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1352)	at org.xwiki.wysiwyg.server.filter.XWikiContextInitializationFilter.doFilter(XWikiContextInitializationFilter.java:85)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1323)	at com.xpn.xwiki.plugin.webdav.XWikiDavFilter.doFilter(XWikiDavFilter.java:66)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1323)	at org.xwiki.container.servlet.filters.internal.SavedRequestRestorerFilter.doFilter(SavedRequestRestorerFilter.java:208)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1323)	at org.xwiki.container.servlet.filters.internal.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:111)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1323)	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:476)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:119)	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:517)	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:225)	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:937)	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:406)	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:183)	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:871)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:117)	at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:247)	at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:149)	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:110)	at org.eclipse.jetty.server.Server.handle(Server.java:346)	at org.eclipse.jetty.server.HttpConnection.handleRequest(HttpConnection.java:589)	at org.eclipse.jetty.server.HttpConnection$RequestHandler.content(HttpConnection.java:1065)	at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:823)	at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:220)	at org.eclipse.jetty.server.HttpConnection.handle(HttpConnection.java:411)	at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:535)	at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:40)	at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:529)	at java.lang.Thread.run(Thread.java:680)