Error en servlet

[leidy_03]

Hola amigos del foro, por favor he estado lidiando con este proyecto y nada que doy
me sale el siguiente error en uno de los manager del servidor tomcat.

Código:

2/11/2012 08:37:06 AM org.apache.catalina.core.ApplicationContext log
INFO: HTMLManager: list: Listing contexts for virtual host 'localhost'
2/11/2012 08:37:08 AM org.apache.catalina.core.ApplicationContext log
INFO: HTMLManager: sessions: Session action 'null' for web application at '/pro_evadoc'
2/11/2012 08:37:24 AM org.apache.catalina.core.ApplicationContext log
INFO: HTMLManager: list: Listing contexts for virtual host 'localhost'
2/11/2012 08:37:26 AM org.apache.catalina.core.ApplicationContext log
INFO: HTMLManager: sessions: Session information for web application at '/pro_evadoc'
2/11/2012 08:37:26 AM org.apache.catalina.core.ApplicationContext log
INFO: HTMLManager: sessions: Session expiration for 30 minutes '/pro_evadoc'
2/11/2012 08:37:26 AM org.apache.catalina.core.ApplicationContext log
INFO: HTMLManager: list: Listing contexts for virtual host 'localhost'
2/11/2012 08:38:34 AM org.apache.catalina.core.ApplicationContext log
INFO: HTMLManager: sessions: Session action 'null' for web application at '/pro_evadoc'
2/11/2012 08:38:47 AM org.apache.catalina.core.ApplicationContext log
INFO: HTMLManager: sessions: Session action 'sessionDetail' for web application at '/pro_evadoc'
2/11/2012 08:38:47 AM org.apache.catalina.core.ApplicationDispatcher invoke
GRAVE: El Servlet.service() para servlet jsp lanzó una excepción
java.lang.NullPointerException
	at org.apache.jsp.WEB_002dINF.jsp.sessionDetail_jsp._jspService(sessionDetail_jsp.java:70)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:386)

Gracias de antemano por su ayuda y colaboración.

[Fuzzylog]

Revisa el web.xml a ver si tienes un tiempo de timeout de sesión muy bajo (ten en cuenta que hay que indicarlo en milisegundos), o algún parámetro de sesión sin activar.

[leidy_03]

Gracias Fuzzylog, ya solucione ese problema efectivamente era por la sesiones; ahora me sale el siguiente error:

com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception:

** BEGIN NESTED EXCEPTION **

java.io.IOException
MESSAGE: Stream closed

STACKTRACE:

java.io.IOException: Stream closed
at com.mysql.jdbc.util.ReadAheadInputStream.checkClos ed(ReadAheadInputStream.java:238)
at com.mysql.jdbc.util.ReadAheadInputStream.read(Read AheadInputStream.java:178)
at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:1994 )
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO. java:2411)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.ja va:2916)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:16 31)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java :1723)
at com.mysql.jdbc.Connection.execSQL(Connection.java: 3256)
at com.mysql.jdbc.PreparedStatement.executeInternal(P reparedStatement.java:1313)
at com.mysql.jdbc.PreparedStatement.executeQuery(Prep aredStatement.java:1448)
at Sente.dao.SenteCuestDao.ingresarresdo(SenteCuestDa o.java:635)
at servlets.rsptacuestdoc.processRequest(rsptacuestdo c.java:193)
at servlets.rsptacuestdoc.doPost(rsptacuestdoc.java:2 78)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:717)
at org.apache.catalina.core.ApplicationFilterChain.in ternalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.do Filter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invo ke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invo ke(StandardContextValve.java:191)
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.invok e(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.servic e(CoyoteAdapter.java:298)
at org.apache.coyote.http11.Http11Processor.process(H ttp11Processor.java:859)
at org.apache.coyote.http11.Http11Protocol$Http11Conn ectionHandler.process(Http11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run( JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:662)

He buscado y la verdad no se porque me sale este error, asumo que es conexión, pero no se que sera.

[Xerelo]

Tienes que empezar a probar cosas.

Examinar la excepción (las de SQL pueden llegar encapsuladas), hacer un ping desde código a la BBDD, usar otra query que no tenga que ver, probar esa misma query directamente en mysql, si usas una PreparedStatement probar con Statement...

http://stackoverflow.com/questions/2...tions-link-fai

If you get a SQLException: Connection refused or Connection timed out or a MySQL specific CommunicationsException: Communications link failure, then it means that the DB isn't reachable at all. This can have one or more of the following causes:

IP address or hostname in JDBC URL is wrong.
Hostname in JDBC URL is not recognized by local DNS server.
Port number is missing or wrong in JDBC URL.
DB server is down.
DB server doesn't accept TCP/IP connections.
DB server has run out of connections.
Something in between Java and DB is blocking connections, e.g. a firewall or proxy.

[leidy_03]

Gracias Xerelo, voy a revisar.