After installing jasperserver-datasources-file-ce on a jasperserver pro 3.7.1 or 3.7.0 ( i tried both) the console gives a nullpoint exception and the server is not reachable anymore. Without the patch everything is working. I need this for a demo which is using a excel xls file as input for a report. the report is working within ireports The serverconsole log: 2010-12-09 17:07:37,745 ERROR [/jasperserver-pro],main:3767 - Exception sending context initialized event to listener in stance of class com.jaspersoft.ji.war.common.FusionConfigListener java.lang.NullPointerException at java.util.Hashtable.put(Hashtable.java:396) at java.util.Properties.setProperty(Properties.java:128) at net.sf.jasperreports.engine.util.JRProperties.setProperty(JRProperties.java:412) at com.jaspersoft.ji.war.common.FusionConfigListener.contextInitialized(FusionConfigListener.java:51) at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3763) at org.apache.catalina.core.StandardContext.start(StandardContext.java:4211) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:759) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:739) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:524) at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:904) at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:867) at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:474) at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1122) at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:310) at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1021) at org.apache.catalina.core.StandardHost.start(StandardHost.java:718) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1013) at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:442) at org.apache.catalina.core.StandardService.start(StandardService.java:450) at org.apache.catalina.core.StandardServer.start(StandardServer.java:709) at org.apache.catalina.startup.Catalina.start(Catalina.java:551) 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:585) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:294) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:432) 9-dec-2010 17:07:37 org.apache.catalina.core.StandardContext start SEVERE: Error listenerStart 9-dec-2010 17:07:37 org.apache.catalina.core.StandardContext start SEVERE: Context [/jasperserver-pro] startup failed due to previous errors 9-dec-2010 17:07:38 org.apache.coyote.http11.Http11BaseProtocol start INFO: Starting Coyote HTTP/1.1 on http-8080 9-dec-2010 17:07:38 org.apache.jk.common.ChannelSocket init INFO: JK: ajp13 listening on /0.0.0.0:8009 9-dec-2010 17:07:38 org.apache.jk.server.JkMain start INFO: Jk running ID=0 time=0/15 config=null 9-dec-2010 17:07:38 org.apache.catalina.storeconfig.StoreLoader load INFO: Find registry server-registry.xml at classpath resource 9-dec-2010 17:07:38 org.apache.catalina.startup.Catalina start INFO: Server startup in 10031 ms