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java.lang.NullPointerException: 	at EmailFormatServlet.destroy(EmailFormatServlet.java:27)	at org.apache.catalina.core.StandardWrapper.unload(StandardWrapper.java:1394)	at org.apache.catalina.core.StandardWrapper.stop(StandardWrapper.java:1739)	at org.apache.catalina.core.StandardContext.stop(StandardContext.java:4601)	at org.apache.catalina.core.StandardContext.reload(StandardContext.java:3222)	at org.apache.catalina.manager.ManagerServlet.reload(ManagerServlet.java:943)	at org.apache.catalina.manager.ManagerServlet.doGet(ManagerServlet.java:361)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)	at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:199)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:558)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)	at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:859)	at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:579)	at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1555)	at java.lang.Thread.run(Thread.java:662)