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java.lang.NullPointerException: 	at nl.b3p.viewer.util.databaseupdate.DatabaseSynchronizerEM.updateApplicationLayersAttributesOrder(DatabaseSynchronizerEM.java:53)	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 nl.b3p.viewer.util.databaseupdate.DatabaseSynchronizer$ScriptWorker.execute(DatabaseSynchronizer.java:374)	at org.hibernate.impl.SessionImpl.doWork(SessionImpl.java:1997)	at nl.b3p.viewer.util.databaseupdate.DatabaseSynchronizer.doInit(DatabaseSynchronizer.java:199)	at nl.b3p.viewer.util.databaseupdate.DatabaseSynchronizer.init(DatabaseSynchronizer.java:402)	at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1241)	at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1154)	at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1041)	at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4944)	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5230)	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:725)	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:701)	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:714)	at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:581)	at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:455)	at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1493)	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.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:300)	at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)	at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)	at org.apache.catalina.manager.ManagerServlet.check(ManagerServlet.java:1432)	at org.apache.catalina.manager.ManagerServlet.deploy(ManagerServlet.java:884)	at org.apache.catalina.manager.ManagerServlet.doGet(ManagerServlet.java:335)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:618)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)	at org.apache.catalina.filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:108)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:613)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:537)	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1085)	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:658)	at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:222)	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1556)	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1513)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)	at java.lang.Thread.run(Thread.java:745)