本人在写发送html格式的邮件的时候出现了以下错误，各位高手指教

C:\bea\jdk131_06\bin\javaw -classpath "C:\bea\weblogic700\server\lib\weblogic.jar" -ms64m -mx64m -Djava.library.path="C:/bea/weblogic700/server/bin" -Dbea.home="C:/bea" -Dweblogic.Name=myserver -Djava.security.policy=="C:/bea/weblogic700/server/lib/weblogic.policy" -Dweblogic.management.discover=false -Dweblogic.ProductionModeEnabled=false -Dweblogic.management.username=javaboy -Dweblogic.management.password=81101010 weblogic.Server
Starting WebLogic Server...
<2004-9-7 上午11时32分18秒> <Notice> <Management> <140005> <Loading configuration C:\bea\user_projects\mydomain\.\config.xml>
<2004-9-7 上午11时32分25秒> <Notice> <Security> <090082> <Security initializing using realm myrealm.>
<2004-9-7 上午11时32分26秒> <Notice> <WebLogicServer> <000327> <Starting WebLogic Admin Server "myserver" for domain "mydomain">
<2004-9-7 上午11时32分38秒> <Notice> <Management> <141052> <Application Poller started for development server.>
<2004-9-7 上午11时32分40秒> <Notice> <WebLogicServer> <000354> <Thread "ListenThread.Default" listening on port 7001>
<2004-9-7 上午11时32分40秒> <Notice> <WebLogicServer> <000354> <Thread "SSLListenThread.Default" listening on port 7002>
<2004-9-7 上午11时32分40秒> <Notice> <WebLogicServer> <000331> <Started WebLogic Admin Server "myserver" for domain "mydomain" running in Development Mode>
<2004-9-7 上午11时32分41秒> <Error> <HTTP> <101018> <[ServletContext(id=541465,name=sendmailpro,context-path=/sendmailpro)] Servlet failed with ServletException
javax.servlet.UnavailableException: ServletContext(id=541465,name=sendmailpro,context-path=/sendmailpro): The server myserver is temporarily suspended
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3096)
at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2588)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:213)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:189)
>
<2004-9-7 上午11时32分41秒> <Notice> <WebLogicServer> <000365> <Server state changed to RUNNING>
<2004-9-7 上午11时32分41秒> <Notice> <WebLogicServer> <000360> <Server started in RUNNING mode>
<2004-9-7 上午11时33分47秒> <Error> <HTTP> <101017> <[ServletContext(id=541465,name=sendmailpro,context-path=/sendmailpro)] Root cause of ServletException
java.lang.NullPointerException
at SendMail.doPost(SendMail.java:42)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:1058)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:401)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:306)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:5445)
at weblogic.security.service.SecurityServiceManager.runAs(SecurityServiceManager.java:780)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3105)
at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2588)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:213)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:189)
>