Issue

Many threads in thread pool were busy sending email, so there were no availiable threads to serve user's request. We know the mail server had problems at the time, how do we minimize the impact on JBoss, and it's ability to service web request. An example of the thread that was busy sending email is below:

"ajp-192.168.203.25-8009-47" daemon prio=1 tid=0x00002aaab4a9e110 nid=0xe59 runnable [0x00000000513e2000..0x00000000513e3b10]
        at java.net.SocketInputStream.socketRead0(Native Method)
        at java.net.SocketInputStream.read(SocketInputStream.java:129)
        at com.sun.mail.util.TraceInputStream.read(TraceInputStream.java:110)
        at java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
        at java.io.BufferedInputStream.read(BufferedInputStream.java:235)
        - locked <0x00000000b95284d8> (a java.io.BufferedInputStream)
        at com.sun.mail.util.LineInputStream.readLine(LineInputStream.java:88)
        at com.sun.mail.smtp.SMTPTransport.readServerResponse(SMTPTransport.java:1589)
        at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1369)
        at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:412)
        at javax.mail.Service.connect(Service.java:288)
        - locked <0x00000000b7b63a10> (a com.sun.mail.smtp.SMTPTransport)
        at javax.mail.Service.connect(Service.java:169)
        at javax.mail.Service.connect(Service.java:118)
        at javax.mail.Transport.send0(Transport.java:188)
        at javax.mail.Transport.send(Transport.java:118)
        at com.mycompany.util.mail.Mailer.send(Mailer.java:136)
        at com.mycompany.web.proxy.MailProxy.send(MailProxy.java:108)
        at com.mycompany.web.proxy.SalesReportProxy.sendReport(SalesReportProxy.java:587)
        at com.mycompany.web.action.wss.report.SalesReportSubscribeAction.service(SalesReportSubscribeAction.java:92)
        at com.mycompany.web.action.Action.service(Action.java:95)
        at com.mycompany.web.MainServlet.callAction(MainServlet.java:423)
        at com.mycompany.web.MainServlet.doService(MainServlet.java:407)
        at com.mycompany.web.MainServlet.service(MainServlet.java:231)
        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 com.mycompany.web.util.XSSFilter.doFilter(XSSFilter.java:77)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
        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:230)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:173)
        at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:182)
        at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
        at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
        at org.apache.catalina.authenticator.SingleSignOn.invoke(SingleSignOn.java:393)
        at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:543)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:241)
        at org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:437)
        at org.apache.coyote.ajp.AjpProtocol$AjpConnectionHandler.process(AjpProtocol.java:381)
        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
        at java.lang.Thread.run(Thread.java:595)