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Date: Wed, 25 Feb 2004 10:46:32 +0100
From: Adam Hardy <ahardy.struts@cyberspaceroad.com>
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To: Tomcat Users List <tomcat-user@jakarta.apache.org>
Subject: Re: Tomcat 4.1.29 CoyoteAdapter Exception
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Randall,
I've often had issues that cause major problems, and my experience is 
that user groups and mailing lists are normally unable to help without 
there being an easily reproducible error.

For instance, are you able to nail it down to a particular page or 
servlet? Does it happen regularly or at random? Can you make a test case?

Sorry I can't be any help, but good luck finding it.

Adam

On 02/25/2004 12:03 AM Randall Svancara wrote:
> What would cause the coyote connector to return a null pointer
> exception.  Every time this happens, mod_jk is unable to communicate
> with tomcat and as a result our web service is unusable. Is this a
> tomcat bug, or a problem with running tomcat on Windows XP.....
> 
> Anyway, I have looked through this user group and found some other
> people with this problem on Solaris, but no real answers.
> 
> Thanks.
> 
> 
> 
> 
> I am running tomcat 4.1.29, apache 2.0.48, with mod_jk configured on
> Windows XP.  Occasionally, I will receive the following error:
> 
> 2004-02-23 15:40:07 CoyoteAdapter  Requested cookie session id is
> A02AD09BF242D0D916799B2EBB0FCC92.worker1 2004-02-23 15:40:07
> CoyoteAdapter An exception or error occurred in the container during
> the request processing java.lang.NullPointerException at
> org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:164)
>  at
> org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
>  at
> org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
>  at
> org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
>  at
> org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:193)
>  at
> org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:309)
>  at
> org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:387) 
> at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:673) 
> at
> org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:615)
>  at
> org.apache.jk.common.SocketConnection.runIt(ChannelSocket.java:786) 
> at
> org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:666)
>  at java.lang.Thread.run(Thread.java:534)
> 
> 
> 
> 
> 
> 
> -----Original Message----- From: Randall Svancara Sent: Tuesday,
> February 24, 2004 11:34 AM To: Tomcat Users List Subject: RE: Tomcat
> 4.1.29 CoyoteAdapter Exception
> 
> 
> Here is my server.xml in full for anyone interested.  It is at the
> end of this email.
> 
> 
> 
> -----Original Message----- From: Randall Svancara Sent: Tuesday,
> February 24, 2004 11:14 AM To: Tomcat Users List Subject: RE: Tomcat
> 4.1.29 CoyoteAdapter Exception
> 
> 
> Hmm...I am unable to find anything in google regarding this error.
> 
> -----Original Message----- From: Randall Svancara Sent: Tuesday,
> February 24, 2004 8:48 AM To: tomcat-user@jakarta.apache.org Subject:
> Tomcat 4.1.29 CoyoteAdapter Exception
> 
> 
> Hi,
> 
> I am running tomcat 4.1.29, apache 2.0.48, with mod_jk configured on
> Windows XP.  Occasionally, I will receive the following error:
> 
> 2004-02-23 15:40:07 CoyoteAdapter  Requested cookie session id is
> A02AD09BF242D0D916799B2EBB0FCC92.worker1 2004-02-23 15:40:07
> CoyoteAdapter An exception or error occurred in the container during
> the request processing java.lang.NullPointerException at
> org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:164)
>  at
> org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
>  at
> org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
>  at
> org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
>  at
> org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:193)
>  at
> org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:309)
>  at
> org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:387) 
> at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:673) 
> at
> org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:615)
>  at
> org.apache.jk.common.SocketConnection.runIt(ChannelSocket.java:786) 
> at
> org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:666)
>  at java.lang.Thread.run(Thread.java:534)
> 
> At which point the web service becomes UNAVAILABLE on port 80 through
> apache which forwards the requests via mod_jk to the tomcat 4.1.29
> servlet engine.  I am including some snippets from my server.xml
> below for the coyote connector.
> 
> <Connector className="org.apache.coyote.tomcat4.CoyoteConnector" 
> port="8019" minProcessors="100" maxProcessors="600" 
> enableLookups="false" redirectPort="8443" acceptCount="10" debug="10"
> connectionTimeout="60000" useURIValidationHack="false" 
> protocolHandlerClassName="org.apache.jk.server.JkCoyoteHandler"/>
> 
> 
> I have also configured apache with 600 max threads, see snippet
> below.
> 
> # WinNT MPM # ThreadsPerChild: constant number of worker threads in
> the server process # MaxRequestsPerChild: maximum  number of requests
> a server process serves <IfModule mpm_winnt.c> ThreadsPerChild 600 
> MaxRequestsPerChild  0 </IfModule>
> 
> If someone has any idea what I have misconfigured or if you need more
> information, let me know. I am desperate at this point to find the
> root of this problem that has been plaguing our website since its 
> release January.
> 
> Thank you,
> 
> Randall Svancara
> 
> ---------------------------------------------------------------------
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> For additional commands, e-mail: tomcat-user-help@jakarta.apache.org
> 
> 
> ---------------------------------------------------------------------
>  To unsubscribe, e-mail: tomcat-user-unsubscribe@jakarta.apache.org 
> For additional commands, e-mail: tomcat-user-help@jakarta.apache.org
> 
> 
> <!-- Example Server Configuration File --> <!-- Note that component
> elements are nested corresponding to their parent-child relationships
> with each other -->
> 
> <!-- A "Server" is a singleton element that represents the entire
> JVM, which may contain one or more "Service" instances.  The Server 
> listens for a shutdown command on the indicated port.
> 
> Note:  A "Server" is not itself a "Container", so you may not define
> subcomponents such as "Valves" or "Loggers" at this level. -->
> 
> <Server port="8005" shutdown="SHUTDOWN" debug="0">
> 
> 
> <!-- Uncomment these entries to enable JMX MBeans support --> 
> <Listener
> className="org.apache.catalina.mbeans.ServerLifecycleListener" 
> debug="0"/> <Listener
> className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener"
>  debug="0"/>
> 
> <!-- Global JNDI resources --> <GlobalNamingResources>
> 
> <!-- Test entry for demonstration purposes --> <Environment
> name="simpleValue" type="java.lang.Integer" value="30"/>
> 
> <!-- Editable user database that can also be used by 
> UserDatabaseRealm to authenticate users --> <Resource
> name="UserDatabase" auth="Container" 
> type="org.apache.catalina.UserDatabase" description="User database
> that can be updated and saved"> </Resource> <ResourceParams
> name="UserDatabase"> <parameter> <name>factory</name> 
> <value>org.apache.catalina.users.MemoryUserDatabaseFactory</value> 
> </parameter> <parameter> <name>pathname</name> 
> <value>conf/tomcat-users.xml</value> </parameter> </ResourceParams>
> 
> </GlobalNamingResources>
> 
> <!-- A "Service" is a collection of one or more "Connectors" that
> share a single "Container" (and therefore the web applications
> visible within that Container).  Normally, that Container is an
> "Engine", but this is not required.
> 
> Note:  A "Service" is not itself a "Container", so you may not define
> subcomponents such as "Valves" or "Loggers" at this level. -->
> 
> <!-- Define the Tomcat Stand-Alone Service --> <Service
> name="Tomcat-Standalone">
> 
> <!-- A "Connector" represents an endpoint by which requests are
> received and responses are returned.  Each Connector passes requests
> on to the associated "Container" (normally an Engine) for processing.
> 
> 
> By default, a non-SSL HTTP/1.1 Connector is established on port 8080.
>  You can also enable an SSL HTTP/1.1 Connector on port 8443 by 
> following the instructions below and uncommenting the second
> Connector entry.  SSL support requires the following steps (see the
> SSL Config HOWTO in the Tomcat 4.0 documentation bundle for more
> detailed instructions): * Download and install JSSE 1.0.2 or later,
> and put the JAR files into "$JAVA_HOME/jre/lib/ext". * Execute: 
> %JAVA_HOME%\bin\keytool -genkey -alias tomcat -keyalg RSA (Windows) 
> $JAVA_HOME/bin/keytool -genkey -alias tomcat -keyalg RSA  (Unix) with
> a password value of "changeit" for both the certificate and the
> keystore itself.
> 
> By default, DNS lookups are enabled when a web application calls 
> request.getRemoteHost().  This can have an adverse impact on 
> performance, so you can disable it by setting the "enableLookups"
> attribute to "false".  When DNS lookups are disabled, 
> request.getRemoteHost() will return the String version of the IP
> address of the remote client. -->
> 
> <!-- Define a non-SSL Coyote HTTP/1.1 Connector on port 8081 --> 
> <Connector className="org.apache.coyote.tomcat4.CoyoteConnector" 
> port="8080"  minProcessors="5" maxProcessors="75" 
> enableLookups="true" redirectPort="8443" acceptCount="100" debug="0"
> connectionTimeout="20000" useURIValidationHack="false"
> disableUploadTimeout="true" /> <!-- Note : To disable connection
> timeouts, set connectionTimeout value to -1 -->
> 
> <!-- Define a SSL Coyote HTTP/1.1 Connector on port 8443 --> <!-- 
> <Connector className="org.apache.coyote.tomcat4.CoyoteConnector" 
> port="8443" minProcessors="80" maxProcessors="400" 
> enableLookups="true" acceptCount="100" debug="0" scheme="https"
> secure="true" useURIValidationHack="false"
> disableUploadTimeout="true"> <Factory
> className="org.apache.coyote.tomcat4.CoyoteServerSocketFactory" 
> clientAuth="false" protocol="TLS" /> </Connector> -->
> 
> <!-- Define a Coyote/JK2 AJP 1.3 Connector on port 8009 --> <!--
> Changed by Randall Svancara January 16, 2004 --> <!-- Changed by
> Randall Svancara January 22, 2004, added more min and max processes
> -->
> 
> 
> <Connector className="org.apache.coyote.tomcat4.CoyoteConnector" 
> port="8019" minProcessors="100" maxProcessors="600" 
> enableLookups="false" redirectPort="8443" acceptCount="10" debug="99"
> connectionTimeout="60000" useURIValidationHack="false" 
> protocolHandlerClassName="org.apache.jk.server.JkCoyoteHandler"/>
> 
> <!-- Define an AJP 1.3 Connector on port 8009 -->
> 
> <!--<Connector className="org.apache.ajp.tomcat4.Ajp13Connector" 
> port="8019" minProcessors="200" maxProcessors="600" acceptCount="10"
> connectionTimeout="60000" debug="10"/>-->
> 
> 
> <!-- Define a Proxied HTTP/1.1 Connector on port 8082 --> <!-- See
> proxy documentation for more information about using this. --> <!-- 
> <Connector className="org.apache.coyote.tomcat4.CoyoteConnector" 
> port="8082" minProcessors="5" maxProcessors="75" enableLookups="true"
> disableUploadTimeout="true" acceptCount="100" debug="0"
> connectionTimeout="20000" proxyPort="80" useURIValidationHack="false"
> /> -->
> 
> <!-- Define a non-SSL legacy HTTP/1.1 Test Connector on port 8083 -->
>  <!-- <Connector
> className="org.apache.catalina.connector.http.HttpConnector" 
> port="8083" minProcessors="5" maxProcessors="75" enableLookups="true"
> redirectPort="8443" acceptCount="10" debug="0" /> -->
> 
> <!-- Define a non-SSL HTTP/1.0 Test Connector on port 8084 --> <!-- 
> <Connector
> className="org.apache.catalina.connector.http10.HttpConnector" 
> port="8084" minProcessors="5" maxProcessors="75" enableLookups="true"
> redirectPort="8443" acceptCount="10" debug="0" /> -->
> 
> <!-- An Engine represents the entry point (within Catalina) that
> processes every request.  The Engine implementation for Tomcat stand
> alone analyzes the HTTP headers included with the request, and passes
> them on to the appropriate Host (virtual host). -->
> 
> <!-- Define the top level container in our container hierarchy --> 
> <Engine name="Standalone" defaultHost="localhost" debug="0"
> jvmRoute="worker1">
> 
> <!-- The request dumper valve dumps useful debugging information
> about the request headers and cookies that were received, and the
> response headers and cookies that were sent, for all requests
> received by this instance of Tomcat.  If you care only about requests
> to a particular virtual host, or a particular application, nest this 
> element inside the corresponding <Host> or <Context> entry instead.
> 
> For a similar mechanism that is portable to all Servlet 2.3 
> containers, check out the "RequestDumperFilter" Filter in the example
> application (the source for this filter may be found in 
> "$CATALINA_HOME/webapps/examples/WEB-INF/classes/filters").
> 
> Request dumping is disabled by default.  Uncomment the following 
> element to enable it. --> <!-- <Valve
> className="org.apache.catalina.valves.RequestDumperValve"/> -->
> 
> <!-- Global logger unless overridden at lower levels --> <Logger
> className="org.apache.catalina.logger.FileLogger" 
> prefix="catalina_log." suffix=".txt" timestamp="true"/>
> 
> <!-- Because this Realm is here, an instance will be shared globally
> -->
> 
> <!-- This Realm uses the UserDatabase configured in the global JNDI 
> resources under the key "UserDatabase".  Any edits that are performed
> against this UserDatabase are immediately available for use by the
> Realm.  --> <Realm
> className="org.apache.catalina.realm.UserDatabaseRealm" debug="0"
> resourceName="UserDatabase"/>
> 
> <!-- Comment out the old realm but leave here for now in case we need
> to go back quickly --> <!-- <Realm
> className="org.apache.catalina.realm.MemoryRealm" /> -->
> 
> <!-- Replace the above Realm with one of the following to get a Realm
>  stored in a database and accessed via JDBC -->
> 
> <!-- <Realm  className="org.apache.catalina.realm.JDBCRealm"
> debug="99" driverName="org.gjt.mm.mysql.Driver" 
> connectionURL="jdbc:mysql://localhost/authority" 
> connectionName="test" connectionPassword="test" userTable="users"
> userNameCol="user_name" userCredCol="user_pass" 
> userRoleTable="user_roles" roleNameCol="role_name" /> -->
> 
> <!-- <Realm  className="org.apache.catalina.realm.JDBCRealm"
> debug="99" driverName="oracle.jdbc.driver.OracleDriver" 
> connectionURL="jdbc:oracle:thin:@ntserver:1521:ORCL" 
> connectionName="scott" connectionPassword="tiger" userTable="users"
> userNameCol="user_name" userCredCol="user_pass" 
> userRoleTable="user_roles" roleNameCol="role_name" /> -->
> 
> <!-- <Realm  className="org.apache.catalina.realm.JDBCRealm"
> debug="99" driverName="sun.jdbc.odbc.JdbcOdbcDriver" 
> connectionURL="jdbc:odbc:CATALINA" userTable="users"
> userNameCol="user_name" userCredCol="user_pass" 
> userRoleTable="user_roles" roleNameCol="role_name" /> -->
> 
> <!-- Define the default virtual host --> <Host name="localhost"
> debug="0" appBase="webapps" unpackWARs="true" autoDeploy="true">
> 
> <!-- Normally, users must authenticate themselves to each web app 
> individually.  Uncomment the following entry if you would like a user
> to be authenticated the first time they encounter a resource
> protected by a security constraint, and then have that user identity
> maintained across *all* web applications contained in this virtual
> host. --> <!-- <Valve
> className="org.apache.catalina.authenticator.SingleSignOn" 
> debug="0"/> -->
> 
> <!-- Access log processes all requests for this virtual host.  By 
> default, log files are created in the "logs" directory relative to 
> $CATALINA_HOME.  If you wish, you can specify a different directory
> with the "directory" attribute.  Specify either a relative (to
> $CATALINA_HOME) or absolute path to the desired directory. --> <!-- 
> <Valve className="org.apache.catalina.valves.AccessLogValve" 
> directory="logs"  prefix="localhost_access_log." suffix=".txt" 
> pattern="common" resolveHosts="false"/> -->
> 
> <!-- Logger shared by all Contexts related to this virtual host.  By 
> default (when using FileLogger), log files are created in the "logs" 
> directory relative to $CATALINA_HOME.  If you wish, you can specify a
> different directory with the "directory" attribute.  Specify either a
>  relative (to $CATALINA_HOME) or absolute path to the desired 
> directory.--> <Logger
> className="org.apache.catalina.logger.FileLogger" directory="logs"
> prefix="localhost_log." suffix=".txt" timestamp="true"/>
> 
> <!-- Define properties for each web application.  This is only needed
>  if you want to set non-default properties, or have web application 
> document roots in places other than the virtual host's appBase 
> directory.  -->
> 
> <!-- Tomcat Root Context --> <!-- <Context path="" docBase="ROOT"
> debug="0"/> -->
> 
> <!-- Tomcat Examples Context --> <Context path="/examples"
> docBase="examples" debug="0" reloadable="true" crossContext="true"> 
> <Logger className="org.apache.catalina.logger.FileLogger" 
> prefix="localhost_examples_log." suffix=".txt" timestamp="true"/> 
> <Ejb   name="ejb/EmplRecord" type="Entity" 
> home="com.wombat.empl.EmployeeRecordHome" 
> remote="com.wombat.empl.EmployeeRecord"/>
> 
> <!-- If you wanted the examples app to be able to edit the user
> database, you would uncomment the following entry. Of course, you
> would want to enable security on the application as well, so this is
> not done by default! The database object could be accessed like this:
> 
> 
> Context initCtx = new InitialContext(); Context envCtx = (Context)
> initCtx.lookup("java:comp/env"); UserDatabase database = 
> (UserDatabase) envCtx.lookup("userDatabase"); --> <!-- <ResourceLink
> name="userDatabase" global="UserDatabase" 
> type="org.apache.catalina.UserDatabase"/> -->
> 
> 
> <!-- PersistentManager: Uncomment the section below to test
> Persistent Sessions.
> 
> saveOnRestart: If true, all active sessions will be saved to the
> Store when Catalina is shutdown, regardless of other settings. All
> Sessions found in the Store will be loaded on startup. Sessions past
> their expiration are ignored in both cases. maxActiveSessions: If 0
> or greater, having too many active sessions will result in some being
> swapped out. minIdleSwap limits this. -1 means unlimited sessions are
> allowed. 0 means sessions will almost always be swapped out after use
> - this will be noticeably slow for your users. minIdleSwap: Sessions
> must be idle for at least this long (in seconds) before they will be
> swapped out due to maxActiveSessions. This avoids thrashing when the
> site is highly active. -1 or 0 means there is no minimum - sessions 
> can be swapped out at any time. maxIdleSwap: Sessions will be swapped
> out if idle for this long (in seconds). If minIdleSwap is higher,
> then it will override this. This isn't exact: it is checked
> periodically. -1 means sessions won't be swapped out for this reason,
>  although they may be swapped out for maxActiveSessions. If set to >=
> 0, guarantees that all sessions found in the Store will be loaded on
> startup. maxIdleBackup: Sessions will be backed up (saved to the
> Store, but left in active memory) if idle for this long (in seconds),
>  and all sessions found in the Store will be loaded on startup. If
> set to -1 sessions will not be backed up, 0 means they should be
> backed up shortly after being used.
> 
> To clear sessions from the Store, set maxActiveSessions, maxIdleSwap,
>  and minIdleBackup all to -1, saveOnRestart to false, then restart 
> Catalina. --> <!-- <Manager
> className="org.apache.catalina.session.PersistentManager" debug="0" 
> saveOnRestart="true" maxActiveSessions="-1" minIdleSwap="-1" 
> maxIdleSwap="-1" maxIdleBackup="-1"> <Store
> className="org.apache.catalina.session.FileStore"/> </Manager> --> 
> <Environment name="maxExemptions" type="java.lang.Integer" 
> value="15"/> <Parameter name="context.param.name"
> value="context.param.value" override="false"/> <Resource
> name="jdbc/EmployeeAppDb" auth="SERVLET" 
> type="javax.sql.DataSource"/> <ResourceParams
> name="jdbc/EmployeeAppDb"> 
> <parameter><name>user</name><value>sa</value></parameter> 
> <parameter><name>password</name><value></value></parameter> 
> <parameter><name>driverClassName</name> 
> <value>org.hsql.jdbcDriver</value></parameter> 
> <parameter><name>driverName</name> 
> <value>jdbc:HypersonicSQL:database</value></parameter> 
> </ResourceParams> <Resource name="mail/Session" auth="Container" 
> type="javax.mail.Session"/> <ResourceParams name="mail/Session"> 
> <parameter> <name>mail.smtp.host</name> <value>localhost</value> 
> </parameter> </ResourceParams> <ResourceLink
> name="linkToGlobalResource" global="simpleValue" 
> type="java.lang.Integer"/> </Context>
> 
> </Host>
> 
> </Engine>
> 
> </Service>
> 
> <!-- The MOD_WEBAPP connector is used to connect Apache 1.3 with
> Tomcat 4.0 as its servlet container. Please read the README.txt file
> coming with the WebApp Module distribution on how to build it. (Or
> check out the "jakarta-tomcat-connectors/webapp" CVS repository)
> 
> To configure the Apache side, you must ensure that you have the 
> "ServerName" and "Port" directives defined in "httpd.conf".  Then, 
> lines like these to the bottom of your "httpd.conf" file:
> 
> LoadModule webapp_module libexec/mod_webapp.so WebAppConnection
> warpConnection warp localhost:8008 WebAppDeploy examples
> warpConnection /examples/
> 
> The next time you restart Apache (after restarting Tomcat, if needed)
>  the connection will be established, and all applications you make 
> visible via "WebAppDeploy" directives can be accessed through Apache.
>  -->
> 
> <!-- Define an Apache-Connector Service --> <!-- <Service
> name="Tomcat-Apache">
> 
> <Connector
> className="org.apache.catalina.connector.warp.WarpConnector" 
> port="8008" minProcessors="5" maxProcessors="75" enableLookups="true"
> appBase="webapps" acceptCount="10" debug="0"/>
> 
> <Engine className="org.apache.catalina.connector.warp.WarpEngine" 
> name="Apache" debug="0">
> 
> <Logger className="org.apache.catalina.logger.FileLogger" 
> prefix="apache_log." suffix=".txt" timestamp="true"/>
> 
> <Realm className="org.apache.catalina.realm.MemoryRealm" />
> 
> </Engine>
> 
> </Service> -->
> 
> </Server>


-- 
struts 1.1 + tomcat 5.0.16 + java 1.4.2
Linux 2.4.20 Debian




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