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From: Jay Kakkad <jay_kakkad@persistent.co.in>
To: "users@tomcat.apache.org" <users@tomcat.apache.org>
CC: Mayank Somani <mayank_somani@persistent.co.in>, Soumya Chattopadhyay
	<soumya_chattopadhyay@persistent.co.in>
Subject: Problem in using multiple clusters in Tomcat 6.0.35
Thread-Topic: Problem in using multiple clusters in Tomcat 6.0.35
Thread-Index: Ac4bLLS1+H658En+QbyXuaM5oSQUew==
Date: Thu, 7 Mar 2013 12:15:25 +0000
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[ version of tomcat : 6.0.35 , os version : RHEL 6.3 , Bit configuration : 6=
4bit ]

Hi,
I am having a requirement where I need to have the same Multicast Ip, but th=
e cluster needs to be differentiated based on domain.For this we are using a=
 domain interceptor DomainFilterInterceptor. So we have configured server.xm=
l as follows:

<Host name=3D"localhost"  appBase=3D"webapps" unpackWARs=3D"true" autoDeploy=
=3D"true"
            xmlValidation=3D"false" xmlNamespaceAware=3D"false">
<Cluster className=3D"org.apache.catalina.ha.tcp.SimpleTcpCluster" channelSe=
ndOptions=3D"8">
<Manager className=3D"org.apache.catalina.ha.session.DeltaManager"
expireSessionsOnShutdown=3D"false"
 notifyListenersOnReplication=3D"true"/>
......................
<Membership className=3D"org.apache.catalina.tribes.membership.McastService"
address=3D"228.0.0.4"
domain=3D"abc.com"
port=3D"45564"
frequency=3D"500"
dropTime=3D"3000" />
.................
<Interceptor className=3D"org.apache.catalina.tribes.group.interceptors.TcpF=
ailureDetector"/>
<Interceptor className=3D"org.apache.catalina.tribes.group.interceptors.Mess=
ageDispatch15Interceptor"/>
<Interceptor className=3D"org.apache.catalina.tribes.group.interceptors.Thro=
ughputInterceptor"/>
<Interceptor classname=3D"org.apache.catalina.tribes.group.interceptors.Doma=
inFilterInterceptor" domain=3D"abc.com"/>
..................
</Channel>
.....................
</Cluster>
</Host>

For this configuration we are getting the following error.

java.lang.NullPointerException
        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at org.apache.tomcat.util.digester.ObjectCreateRule.begin(ObjectCrea=
teRule.java:205)
        at org.apache.tomcat.util.digester.Rule.begin(Rule.java:153)
        at org.apache.tomcat.util.digester.Digester.startElement(Digester.ja=
va:1356)
        at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.star=
tElement(Unknown Source)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScanne=
rImpl.scanStartElement(Unknown Source)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScanne=
rImpl$FragmentContentDriver.next(Unknown Source)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.ne=
xt(Unknown Source)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScanne=
rImpl.scanDocument(Unknown Source)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.par=
se(Unknown Source)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.par=
se(Unknown Source)
        at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknow=
n Source)
        at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.pars=
e(Unknown Source)
        at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXPars=
er.parse(Unknown Source)
        at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1642=
)
        at org.apache.catalina.startup.Catalina.load(Catalina.java:524)
        at org.apache.catalina.startup.Catalina.start(Catalina.java:582)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
        at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
Mar 5, 2013 2:32:32 PM org.apache.catalina.startup.Catalina load
WARNING: Catalina.start using conf/server.xml:
java.lang.NullPointerException
        at org.apache.tomcat.util.digester.Digester.createSAXException(Diges=
ter.java:2806)
        at org.apache.tomcat.util.digester.Digester.createSAXException(Diges=
ter.java:2832)
        at org.apache.tomcat.util.digester.Digester.startElement(Digester.ja=
va:1359)
        at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.star=
tElement(Unknown Source)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScanne=
rImpl.scanStartElement(Unknown Source)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScanne=
rImpl$FragmentContentDriver.next(Unknown Source)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.ne=
xt(Unknown Source)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScanne=
rImpl.scanDocument(Unknown Source)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.par=
se(Unknown Source)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.par=
se(Unknown Source)
        at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknow=
n Source)
        at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.pars=
e(Unknown Source)
        at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXPars=
er.parse(Unknown Source)
        at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1642=
)
        at org.apache.catalina.startup.Catalina.load(Catalina.java:524)
        at org.apache.catalina.startup.Catalina.start(Catalina.java:582)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
        at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
Caused by: java.lang.NullPointerException
        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at org.apache.tomcat.util.digester.ObjectCreateRule.begin(ObjectCrea=
teRule.java:205)
        at org.apache.tomcat.util.digester.Rule.begin(Rule.java:153)
        at org.apache.tomcat.util.digester.Digester.startElement(Digester.ja=
va:1356)
        ... 19 more

Also could you please confirm whether the configuration of server.xml is cor=
rect or need any changes...


Thanks in advance


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