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java.lang.NullPointerException: 	at javax.mail.internet.MimeUtility.checkAscii(MimeUtility.java:915)	at javax.mail.internet.MimeUtility.encodeWord(MimeUtility.java:539)	at javax.mail.internet.MimeUtility.encodeText(MimeUtility.java:373)	at javax.mail.internet.MimeMessage.setSubject(MimeMessage.java:694)	at javax.mail.internet.MimeMessage.setSubject(MimeMessage.java:660)	at SendMail.doPost(SendMail.java:57)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:521)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:588)	at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:405)	at org.apache.tomcat.core.Handler.service(Handler.java:287)	at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)	at org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:812)	at org.apache.tomcat.core.ContextManager.service(ContextManager.java:758)	at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:213)	at org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)	at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:501)	at java.lang.Thread.run(Thread.java:484)