Re: executor does not work with AJP connector

[Filip Hanik - Dev Lists]

an executor would not have helped you in your scenario.
on the apache side do a
JkOptions +DisableReuse

this will turn off the keep alive of those connections, hence free up 
those threads

filip

Joe Reger, Jr. wrote:
I upgraded to Tomcat 6.0.18 and am now getting a warning instead of an NPE:

org.apache.catalina.startup.ConnectorCreateRule _setExecutor
WARNING: Connector [EMAIL PROTECTED] does not
support external executors. Method
setExecutor(java.util.concurrent.Executor) not found.

So it looks like external executors won't work with the AJP connector.

The problem I'm having is on highly loaded members of an app tier. They end
up with a bunch of stuck AJP threads.  I wanted to use the maxIdleTime
property of the Executor to kill them off.

How should I deal with stuck/idle AJP threads?  I'm load balancing with
Apache 2.2 and mod_jk.

Thanks,

Joe

On Sun, Oct 26, 2008 at 9:42 PM, Joe Reger, Jr. <[EMAIL PROTECTED]> wrote:

  
Kinda late to this party but I've gotten the same NPE issue when adding an
Executor to an AJP Connector on 6.0.14 (Win2000Server).  But, I've also
gotten it to work on 6.0.14 on a different machine (Windows XP)... same
server.xml.  Experimenting with the problem server I found that I could keep
the Executor defined but simply not reference it from the Connector and the
server started up (probably not much news there.)

Questions:

1) Could this have something to do with a native OS feature somewhere in
Tomcat?

2) You mentioned that it worked on 6.0.16... anybody know if there was a
fix or if it's just an intermittent issue?

3) Should the Executor work with AJP?  I saw a post from earlier last year
that said Executors don't support AJP.

Thanks all!

Joe


On Wed, Feb 27, 2008 at 10:23 AM, Filip Hanik - Dev Lists <
[EMAIL PROTECTED]> wrote:

    
just tried that with 6.0.16, and it worked

Filip


nitin dubey wrote:

      
Nope.. here is the top portion of server.xml

=====================================================
 <Service name="Catalina">
     <!--The connectors can use a shared executor, you can define one or
more named thread pools-->
   <Executor name="tomcatThreadPool" namePrefix="catalina-exec-"
 maxThreads="150" minSpareThreads="4"/>
           <!-- A "Connector" represents an endpoint by which requests
are received
        and responses are returned. Documentation at :
        Java HTTP Connector: /docs/config/http.html (blocking &
non-blocking)
        Java AJP  Connector: /docs/config/ajp.html
        APR (HTTP/AJP) Connector: /docs/apr.html
        Define a non-SSL HTTP/1.1 Connector on port 8080
   -->
   <Connector port="8080" protocol="HTTP/1.1"
connectionTimeout="20000"               redirectPort="8443" />
   <!-- A "Connector" using the shared thread pool-->
   <!--
   <Connector executor="tomcatThreadPool"
              port="8080" protocol="HTTP/1.1"
connectionTimeout="20000"               redirectPort="8443" />
   -->              <!-- Define a SSL HTTP/1.1 Connector on port 8443
        This connector uses the JSSE configuration, when using APR, the
      connector should be using the OpenSSL style configuration
        described in the APR documentation -->
   <!--
   <Connector port="8443" protocol="HTTP/1.1" SSLEnabled="true"
              maxThreads="150" scheme="https" secure="true"
              clientAuth="false" sslProtocol="TLS" />
   -->

   <!-- Define an AJP 1.3 Connector on port 8009 -->
   <Connector port="8009" protocol="AJP/1.3" redirectPort="8443"
allowTrace="false"        executor="tomcatThreadPool"
connectionTimeout="20000" />

=====================================================

--- On Wed, 27/2/08, Filip Hanik - Dev Lists <[EMAIL PROTECTED]> wrote:



        
From: Filip Hanik - Dev Lists <[EMAIL PROTECTED]>
Subject: Re: executor does not work with AJP connector
To: "Tomcat Users List" <users@tomcat.apache.org>
Date: Wednesday, 27 February, 2008, 5:00 AM
you might have forgotten to uncomment or configure that
actual executor, hence the NPE

Filip

nitin dubey wrote:


          
Hi,

I tried configuring executor in tomcat 6.0.14 for AJP


            
Connector like following:


          
<!-- Define an AJP 1.3 Connector on port 8009


            
-->


          
<Connector port="8009"


            
protocol="AJP/1.3" redirectPort="8443"
allowTrace="false"

          
       executor="tomcatThreadPool"


            
connectionTimeout="20000" />


          
While starting tomcat it gives this error.  Any


            
problem with the configuration OR this is a bug?


          
Feb 26, 2008 1:42:36 PM


            
org.apache.tomcat.util.digester.Digester startElement


          
SEVERE: Begin event threw exception
java.lang.NullPointerException
       at


            
org.apache.catalina.startup.ConnectorCreateRule._setExecutor(ConnectorCreateRule.java:61)


          
       at


            
org.apache.catalina.startup.ConnectorCreateRule.begin(ConnectorCreateRule.java:54)


          
       at


            
org.apache.tomcat.util.digester.Rule.begin(Rule.java:153)


          
       at


            
org.apache.tomcat.util.digester.Digester.startElement(Digester.java:1276)


          
       at


            
com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(AbstractSAXParser.java:533)


          
       at


            
com.sun.org.apache.xerces.internal.parsers.AbstractXMLDocumentParser.emptyElement(AbstractXMLDocumentParser.java:220)


          
       at


            
com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanStartElement(XMLDocumentFragmentScannerImpl.java:872)


          
       at


            
com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(XMLDocumentFragmentScannerImpl.java:1693)


          
       at


            
com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:368)


          
       at


            
com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:834)


          
       at


            
com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:764)


          
       at


            
com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:148)


          
       at


            
com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1242)


          
       at


            
org.apache.tomcat.util.digester.Digester.parse(Digester.java:1562)


          
       at


            
org.apache.catalina.startup.Catalina.load(Catalina.java:504)


          
       at


            
org.apache.catalina.startup.Catalina.load(Catalina.java:538)


          
       at


            
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)


          
       at


            
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)


          
       at


            
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)


          
       at java.lang.reflect.Method.invoke(Method.java:585)
       at


            
org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:260)


          
       at


            
org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:412)


          
Feb 26, 2008 1:42:36 PM


            
org.apache.catalina.startup.Catalina load


          
WARNING: Catalina.start using


            
C:\java\apache-tomcat-6.0.14\conf\server.xml:



          
java.lang.NullPointerException
       at


            
org.apache.tomcat.util.digester.Digester.createSAXException(Digester.java:2726)


          
       at


            
org.apache.tomcat.util.digester.Digester.createSAXException(Digester.java:2752)


          
       at


            
org.apache.tomcat.util.digester.Digester.startElement(Digester.java:1279)


          
       at


            
com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(AbstractSAXParser.java:533)


          
       at


            
com.sun.org.apache.xerces.internal.parsers.AbstractXMLDocumentParser.emptyElement(AbstractXMLDocumentParser.java:220)


          
       at


            
com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanStartElement(XMLDocumentFragmentScannerImpl.java:872)


          
       at


            
com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(XMLDocumentFragmentScannerImpl.java:1693)


          
       at


            
com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:368)


          
       at


            
com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:834)


          
       at


            
com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:764)


          
       at


            
com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:148)


          
       at


            
com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1242)


          
       at


            
org.apache.tomcat.util.digester.Digester.parse(Digester.java:1562)


          
       at


            
org.apache.catalina.startup.Catalina.load(Catalina.java:504)


          
       at


            
org.apache.catalina.startup.Catalina.load(Catalina.java:538)


          
       at


            
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)


          
       at


            
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)


          
       at


            
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)


          
       at java.lang.reflect.Method.invoke(Method.java:585)
       at


            
org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:260)


          
       at


            
org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:412)


          
Feb 26, 2008 1:42:36 PM


            
org.apache.tomcat.util.digester.Digester startElement


          
SEVERE: Begin event threw exception
java.lang.NullPointerException
       at


            
org.apache.catalina.startup.ConnectorCreateRule._setExecutor(ConnectorCreateRule.java:61)


          
       at


            
org.apache.catalina.startup.ConnectorCreateRule.begin(ConnectorCreateRule.java:54)


          
       at


            
org.apache.tomcat.util.digester.Rule.begin(Rule.java:153)


          
       at


            
org.apache.tomcat.util.digester.Digester.startElement(Digester.java:1276)


          
       at


            
com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(AbstractSAXParser.java:533)


          
       at


            
com.sun.org.apache.xerces.internal.parsers.AbstractXMLDocumentParser.emptyElement(AbstractXMLDocumentParser.java:220)


          
       at


            
com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanStartElement(XMLDocumentFragmentScannerImpl.java:872)


          
       at


            
com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(XMLDocumentFragmentScannerImpl.java:1693)


          
       at


            
com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:368)


          
       at


            
com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:834)


          
       at


            
com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:764)


          
       at


            
com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:148)


          
       at


            
com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1242)


          
       at


            
org.apache.tomcat.util.digester.Digester.parse(Digester.java:1562)


          
       at


            
org.apache.catalina.startup.Catalina.load(Catalina.java:504)


          
       at


            
org.apache.catalina.startup.Catalina.start(Catalina.java:558)


          
       at


            
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)


          
       at


            
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)


          
       at


            
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)


          
       at java.lang.reflect.Method.invoke(Method.java:585)
       at


            
org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288)


          
       at


            
org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)


          
Feb 26, 2008 1:42:36 PM


            
org.apache.catalina.startup.Catalina load


          
WARNING: Catalina.start using


            
C:\java\apache-tomcat-6.0.14\conf\server.xml:



          
java.lang.NullPointerException
       at


            
org.apache.tomcat.util.digester.Digester.createSAXException(Digester.java:2726)


          
       at


            
org.apache.tomcat.util.digester.Digester.createSAXException(Digester.java:2752)


          
       at


            
org.apache.tomcat.util.digester.Digester.startElement(Digester.java:1279)


          
       at


            
com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(AbstractSAXParser.java:533)


          
       at


            
com.sun.org.apache.xerces.internal.parsers.AbstractXMLDocumentParser.emptyElement(AbstractXMLDocumentParser.java:220)


          
       at


            
com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanStartElement(XMLDocumentFragmentScannerImpl.java:872)


          
       at


            
com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(XMLDocumentFragmentScannerImpl.java:1693)


          
       at


            
com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:368)


          
       at


            
com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:834)


          
       at


            
com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:764)


          
       at


            
com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:148)


          
       at


            
com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1242)


          
       at


            
org.apache.tomcat.util.digester.Digester.parse(Digester.java:1562)


          
       at


            
org.apache.catalina.startup.Catalina.load(Catalina.java:504)


          
       at


            
org.apache.catalina.startup.Catalina.start(Catalina.java:558)


          
       at


            
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)


          
       at


            
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)


          
       at


            
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)


          
       at java.lang.reflect.Method.invoke(Method.java:585)
       at


            
org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288)


          
       at


            
org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)


          
Feb 26, 2008 1:42:36 PM


            
org.apache.catalina.startup.Catalina start


          
INFO: Server startup in 0 ms
java.lang.reflect.InvocationTargetException
       at


            
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)


          
       at


            
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)


          
       at


            
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)


          
       at java.lang.reflect.Method.invoke(Method.java:585)
       at


            
org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288)


          
       at


            
org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)


          
Caused by: java.lang.NullPointerException
       at


            
org.apache.catalina.startup.Catalina.await(Catalina.java:630)


          
       at


            
org.apache.catalina.startup.Catalina.start(Catalina.java:590)


          
       ... 6 more



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