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java.lang.NullPointerException: 	at org.apache.jsp.mail1_jsp.sendDatMail(mail1_jsp.java:99)	at org.apache.jsp.mail1_jsp._jspService(mail1_jsp.java:218)	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:137)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:210)	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295)	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:256)	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)