Arquivo Discussoes de Programacao e Tecnologia ola pessoal…tenho uma aplicação cliente em java que envia um conjunto de dados para o servidor e o servidor por sua vés responde com alguma coisa. já tratei algumas excepções mas quando o cliente conecta com o servidor, envia os dados e por algum motivo o servidor desligar, o programa retorna um erro e não estou conseguindo tratar esse erro de forma a apresentar ao cliente uma mensagem “o servidor desligou”, por exemplo.
gostaria que me ajudassem com isso por favor!!!
ficool, não entendi muito o problema.
Se você já trata os outros erros, não é a mesma idéia?
é que, sei como tratar as seguintes excepções:
caso o servidor estiver desligado antes de eu enviar os dados, consigo mostrar uma mensagem “servidor desligado”;
caso o client inserir endereço errado, mostra a mensagem “endereço desconhecido”;
mas caso o cliente conseguir se conectar, e enviar os seus dados e por algum motivo o servidor desligar antes de responder ao cliente dá um erro que não sei como tratar…
Provavelmente, o erro é de timeout. Dependendo da sua arquitetura, o erro já é lançado e você só precisa capturar do outro lado. Você sabe se lança alguma exceção? Qual?
Caso não seja, uma solução é você contar o tempo no lado servidor (isso é uma boa prática inclusive em outros casos, quando o servidor está demorando). Por exemplo, se o servidor costuma demorar 10 segundos pra responder, a sua aplicação espera até 15 e dá uma mensagem pro usuário (talvez ele possa decidir se continua esperando ou se cancela a operação, ou algo assim).
ela me dá o seguinte erro em JSP:
[color=green][b]type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:460)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:373)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:329)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
root cause
java.lang.NullPointerException
org.apache.jsp.pro.valida_jsp._jspService(valida_jsp.java:76)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:331)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:329)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
note The full stack trace of the root cause is available in the Apache Tomcat/5.5.28 logs.[/b][/color]
e o log do Tomcat?
ai está o log do tomcat:
31/Mai/2010 10:29:47 org.apache.catalina.core.AprLifecycleListener lifecycleEvent
INFO: The Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: C:\Program Files\Apache Software Foundation\Tomcat 5.5\bin;.;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:\oraclexe\app\oracle\product\10.2.0\server\bin;C:\Program Files\Embarcadero\RAD Studio\7.0\bin;C:\Users\Public\Documents\RAD Studio\7.0\Bpl;C:\DevSuiteHome_1\jdk\jre\bin\classic;C:\DevSuiteHome_1\jdk\jre\bin;C:\DevSuiteHome_1\jdk\jre\bin\client;C:\DevSuiteHome_1\jlib;C:\DevSuiteHome_1\bin;C:\DevSuiteHome_1\jre\1.4.2\bin\client;C:\DevSuiteHome_1\jre\1.4.2\bin;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0;
31/Mai/2010 10:29:47 org.apache.coyote.http11.Http11BaseProtocol init
SEVERE: Error initializing endpoint
java.net.SocketException: Unrecognized Windows Sockets error: 0: JVM_Bind
at java.net.PlainSocketImpl.socketBind(Native Method)
at java.net.PlainSocketImpl.bind(Unknown Source)
at java.net.ServerSocket.bind(Unknown Source)
at java.net.ServerSocket.(Unknown Source)
at java.net.ServerSocket.(Unknown Source)
at org.apache.tomcat.util.net.DefaultServerSocketFactory.createSocket(DefaultServerSocketFactory.java:50)
at org.apache.tomcat.util.net.PoolTcpEndpoint.initEndpoint(PoolTcpEndpoint.java:293)
at org.apache.coyote.http11.Http11BaseProtocol.init(Http11BaseProtocol.java:139)
at org.apache.catalina.connector.Connector.initialize(Connector.java:1017)
at org.apache.catalina.core.StandardService.initialize(StandardService.java:578)
at org.apache.catalina.core.StandardServer.initialize(StandardServer.java:782)
at org.apache.catalina.startup.Catalina.load(Catalina.java:504)
at org.apache.catalina.startup.Catalina.load(Catalina.java:524)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:267)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:432)
31/Mai/2010 10:29:47 org.apache.catalina.startup.Catalina load
SEVERE: Catalina.start
LifecycleException: Protocol handler initialization failed: java.net.SocketException: Unrecognized Windows Sockets error: 0: JVM_Bind
at org.apache.catalina.connector.Connector.initialize(Connector.java:1019)
at org.apache.catalina.core.StandardService.initialize(StandardService.java:578)
at org.apache.catalina.core.StandardServer.initialize(StandardServer.java:782)
at org.apache.catalina.startup.Catalina.load(Catalina.java:504)
at org.apache.catalina.startup.Catalina.load(Catalina.java:524)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:267)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:432)
31/Mai/2010 10:29:47 org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 499 ms
31/Mai/2010 10:29:47 org.apache.catalina.core.StandardService start
INFO: Starting service Catalina
31/Mai/2010 10:29:47 org.apache.catalina.core.StandardEngine start
INFO: Starting Servlet Engine: Apache Tomcat/5.5.28
31/Mai/2010 10:29:47 org.apache.catalina.core.StandardHost start
INFO: XML validation disabled
31/Mai/2010 10:29:48 org.apache.coyote.http11.Http11BaseProtocol start
SEVERE: Error starting endpoint
java.net.SocketException: Unrecognized Windows Sockets error: 0: JVM_Bind
at java.net.PlainSocketImpl.socketBind(Native Method)
at java.net.PlainSocketImpl.bind(Unknown Source)
at java.net.ServerSocket.bind(Unknown Source)
at java.net.ServerSocket.(Unknown Source)
at java.net.ServerSocket.(Unknown Source)
at org.apache.tomcat.util.net.DefaultServerSocketFactory.createSocket(DefaultServerSocketFactory.java:50)
at org.apache.tomcat.util.net.PoolTcpEndpoint.initEndpoint(PoolTcpEndpoint.java:293)
at org.apache.tomcat.util.net.PoolTcpEndpoint.startEndpoint(PoolTcpEndpoint.java:313)
at org.apache.coyote.http11.Http11BaseProtocol.start(Http11BaseProtocol.java:151)
at org.apache.coyote.http11.Http11Protocol.start(Http11Protocol.java:76)
at org.apache.catalina.connector.Connector.start(Connector.java:1090)
at org.apache.catalina.core.StandardService.start(StandardService.java:457)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:700)
at org.apache.catalina.startup.Catalina.start(Catalina.java:552)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:295)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:433)
31/Mai/2010 10:29:48 org.apache.catalina.startup.Catalina start
SEVERE: Catalina.start:
LifecycleException: service.getName(): “Catalina”; Protocol handler start failed: java.net.SocketException: Unrecognized Windows Sockets error: 0: JVM_Bind
at org.apache.catalina.connector.Connector.start(Connector.java:1097)
at org.apache.catalina.core.StandardService.start(StandardService.java:457)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:700)
at org.apache.catalina.startup.Catalina.start(Catalina.java:552)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:295)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:433)
31/Mai/2010 10:29:48 org.apache.catalina.startup.Catalina start
INFO: Server startup in 905 ms
31/Mai/2010 10:31:11 org.apache.coyote.http11.Http11BaseProtocol pause
INFO: Pausing Coyote HTTP/1.1 on http-8080
31/Mai/2010 10:31:12 org.apache.catalina.core.StandardService stop
INFO: Stopping service Catalina
31/Mai/2010 10:31:12 org.apache.catalina.connector.MapperListener destroy
WARNING: Error unregistering MBeanServerDelegate
java.lang.NullPointerException
at org.apache.catalina.connector.MapperListener.destroy(MapperListener.java:173)
at org.apache.catalina.connector.Connector.stop(Connector.java:1138)
at org.apache.catalina.core.StandardService.stop(StandardService.java:519)
at org.apache.catalina.core.StandardServer.stop(StandardServer.java:734)
at org.apache.catalina.startup.Catalina.stop(Catalina.java:602)
at org.apache.catalina.startup.Catalina.start(Catalina.java:577)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:295)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:433)
31/Mai/2010 10:31:12 org.apache.coyote.http11.Http11BaseProtocol destroy
INFO: Stopping Coyote HTTP/1.1 on http-8080
31/Mai/2010 10:31:12 org.apache.catalina.connector.Connector stop
SEVERE: Coyote connector has not been started
31/Mai/2010 10:31:12 org.apache.catalina.core.AprLifecycleListener lifecycleEvent
INFO: Failed shutdown of Apache Portable Runtime
31/Mai/2010 10:31:13 org.apache.catalina.core.AprLifecycleListener lifecycleEvent
INFO: The Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: C:\Program Files\Apache Software Foundation\Tomcat 5.5\bin;.;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:\oraclexe\app\oracle\product\10.2.0\server\bin;C:\Program Files\Embarcadero\RAD Studio\7.0\bin;C:\Users\Public\Documents\RAD Studio\7.0\Bpl;C:\DevSuiteHome_1\jdk\jre\bin\classic;C:\DevSuiteHome_1\jdk\jre\bin;C:\DevSuiteHome_1\jdk\jre\bin\client;C:\DevSuiteHome_1\jlib;C:\DevSuiteHome_1\bin;C:\DevSuiteHome_1\jre\1.4.2\bin\client;C:\DevSuiteHome_1\jre\1.4.2\bin;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0;
31/Mai/2010 10:31:13 org.apache.coyote.http11.Http11BaseProtocol init
SEVERE: Error initializing endpoint
java.net.SocketException: Unrecognized Windows Sockets error: 0: JVM_Bind
at java.net.PlainSocketImpl.socketBind(Native Method)
at java.net.PlainSocketImpl.bind(Unknown Source)
at java.net.ServerSocket.bind(Unknown Source)
at java.net.ServerSocket.(Unknown Source)
at java.net.ServerSocket.(Unknown Source)
at org.apache.tomcat.util.net.DefaultServerSocketFactory.createSocket(DefaultServerSocketFactory.java:50)
at org.apache.tomcat.util.net.PoolTcpEndpoint.initEndpoint(PoolTcpEndpoint.java:293)
at org.apache.coyote.http11.Http11BaseProtocol.init(Http11BaseProtocol.java:139)
at org.apache.catalina.connector.Connector.initialize(Connector.java:1017)
at org.apache.catalina.core.StandardService.initialize(StandardService.java:578)
at org.apache.catalina.core.StandardServer.initialize(StandardServer.java:782)
at org.apache.catalina.startup.Catalina.load(Catalina.java:504)
at org.apache.catalina.startup.Catalina.load(Catalina.java:524)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:267)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:432)
31/Mai/2010 10:31:13 org.apache.catalina.startup.Catalina load
SEVERE: Catalina.start
LifecycleException: Protocol handler initialization failed: java.net.SocketException: Unrecognized Windows Sockets error: 0: JVM_Bind
at org.apache.catalina.connector.Connector.initialize(Connector.java:1019)
at org.apache.catalina.core.StandardService.initialize(StandardService.java:578)
at org.apache.catalina.core.StandardServer.initialize(StandardServer.java:782)
at org.apache.catalina.startup.Catalina.load(Catalina.java:504)
at org.apache.catalina.startup.Catalina.load(Catalina.java:524)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:267)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:432)
31/Mai/2010 10:31:13 org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 453 ms
31/Mai/2010 10:31:13 org.apache.catalina.core.StandardService start
INFO: Starting service Catalina
31/Mai/2010 10:31:13 org.apache.catalina.core.StandardEngine start
INFO: Starting Servlet Engine: Apache Tomcat/5.5.28
31/Mai/2010 10:31:13 org.apache.catalina.core.StandardHost start
INFO: XML validation disabled
31/Mai/2010 10:31:14 org.apache.coyote.http11.Http11BaseProtocol start
SEVERE: Error starting endpoint
java.net.SocketException: Unrecognized Windows Sockets error: 0: JVM_Bind
at java.net.PlainSocketImpl.socketBind(Native Method)
at java.net.PlainSocketImpl.bind(Unknown Source)
at java.net.ServerSocket.bind(Unknown Source)
at java.net.ServerSocket.(Unknown Source)
at java.net.ServerSocket.(Unknown Source)
at org.apache.tomcat.util.net.DefaultServerSocketFactory.createSocket(DefaultServerSocketFactory.java:50)
at org.apache.tomcat.util.net.PoolTcpEndpoint.initEndpoint(PoolTcpEndpoint.java:293)
at org.apache.tomcat.util.net.PoolTcpEndpoint.startEndpoint(PoolTcpEndpoint.java:313)
at org.apache.coyote.http11.Http11BaseProtocol.start(Http11BaseProtocol.java:151)
at org.apache.coyote.http11.Http11Protocol.start(Http11Protocol.java:76)
at org.apache.catalina.connector.Connector.start(Connector.java:1090)
at org.apache.catalina.core.StandardService.start(StandardService.java:457)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:700)
at org.apache.catalina.startup.Catalina.start(Catalina.java:552)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:295)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:433)
31/Mai/2010 10:31:14 org.apache.catalina.startup.Catalina start
SEVERE: Catalina.start:
LifecycleException: service.getName(): “Catalina”; Protocol handler start failed: java.net.SocketException: Unrecognized Windows Sockets error: 0: JVM_Bind
at org.apache.catalina.connector.Connector.start(Connector.java:1097)
at org.apache.catalina.core.StandardService.start(StandardService.java:457)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:700)
at org.apache.catalina.startup.Catalina.start(Catalina.java:552)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:295)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:433)
31/Mai/2010 10:31:14 org.apache.catalina.startup.Catalina start
INFO: Server startup in 748 ms
31/Mai/2010 10:36:00 org.apache.coyote.http11.Http11BaseProtocol pause
INFO: Pausing Coyote HTTP/1.1 on http-8080
31/Mai/2010 10:36:01 org.apache.catalina.core.StandardService stop
INFO: Stopping service Catalina
31/Mai/2010 10:36:01 org.apache.catalina.connector.MapperListener destroy
WARNING: Error unregistering MBeanServerDelegate
java.lang.NullPointerException
at org.apache.catalina.connector.MapperListener.destroy(MapperListener.java:173)
at org.apache.catalina.connector.Connector.stop(Connector.java:1138)
at org.apache.catalina.core.StandardService.stop(StandardService.java:519)
at org.apache.catalina.core.StandardServer.stop(StandardServer.java:734)
at org.apache.catalina.startup.Catalina.stop(Catalina.java:602)
at org.apache.catalina.startup.Catalina.start(Catalina.java:577)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:295)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:433)
31/Mai/2010 10:36:01 org.apache.coyote.http11.Http11BaseProtocol destroy
INFO: Stopping Coyote HTTP/1.1 on http-8080
31/Mai/2010 10:36:01 org.apache.catalina.connector.Connector stop
SEVERE: Coyote connector has not been started
31/Mai/2010 10:36:01 org.apache.catalina.core.AprLifecycleListener lifecycleEvent
INFO: Failed shutdown of Apache Portable Runtime
31/Mai/2010 8:41:18 org.apache.catalina.core.AprLifecycleListener lifecycleEvent
INFO: The Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: C:\Program Files\Apache Software Foundation\Tomcat 5.5\bin;.;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:\oraclexe\app\oracle\product\10.2.0\server\bin;C:\Program Files\Embarcadero\RAD Studio\7.0\bin;C:\Users\Public\Documents\RAD Studio\7.0\Bpl;C:\DevSuiteHome_1\jdk\jre\bin\classic;C:\DevSuiteHome_1\jdk\jre\bin;C:\DevSuiteHome_1\jdk\jre\bin\client;C:\DevSuiteHome_1\jlib;C:\DevSuiteHome_1\bin;C:\DevSuiteHome_1\jre\1.4.2\bin\client;C:\DevSuiteHome_1\jre\1.4.2\bin;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0;
31/Mai/2010 8:41:19 org.apache.coyote.http11.Http11BaseProtocol init
INFO: Initializing Coyote HTTP/1.1 on http-8080
31/Mai/2010 8:41:19 org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 3400 ms
31/Mai/2010 8:41:19 org.apache.catalina.core.StandardService start
INFO: Starting service Catalina
31/Mai/2010 8:41:19 org.apache.catalina.core.StandardEngine start
INFO: Starting Servlet Engine: Apache Tomcat/5.5.28
31/Mai/2010 8:41:19 org.apache.catalina.core.StandardHost start
INFO: XML validation disabled
31/Mai/2010 8:41:22 org.apache.coyote.http11.Http11BaseProtocol start
INFO: Starting Coyote HTTP/1.1 on http-8080
31/Mai/2010 8:41:22 org.apache.jk.common.ChannelSocket init
INFO: JK: ajp13 listening on /0.0.0.0:8009
31/Mai/2010 8:41:22 org.apache.jk.server.JkMain start
INFO: Jk running ID=0 time=0/47 config=null
31/Mai/2010 8:41:22 org.apache.catalina.storeconfig.StoreLoader load
INFO: Find registry server-registry.xml at classpath resource
31/Mai/2010 8:41:22 org.apache.catalina.startup.Catalina start
INFO: Server startup in 3417 ms