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In a recent project on Alfresco, I had to setup a Clustering environment. It all went smoothly but I did face one single issue with the setup of the Clustering on the Alfresco Share layer. That’s something I never faced before and you will understand why below.

Initially, to setup the Alfresco Share Clustering, I used the sample file packaged in the distribution zip (E.g.: alfresco-content-services-distribution-6.1.0.5.zip):

<?xml version='1.0' encoding='UTF-8'?>
<beans 
       xmlns_xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns_hz="http://www.hazelcast.com/schema/spring"
       xsi_schemaLocation="http://www.springframework.org/schema/beans
                http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
                http://www.hazelcast.com/schema/spring
                https://hazelcast.com/schema/spring/hazelcast-spring-2.4.xsd">

   <!--
        Hazelcast distributed messaging configuration - Share web-tier cluster config
        - see http://www.hazelcast.com/docs.jsp
        - and specifically http://docs.hazelcast.org/docs/2.4/manual/html-single/#SpringIntegration
   -->
   <!-- Configure cluster to use either Multicast or direct TCP-IP messaging - multicast is default -->
   <!-- Optionally specify network interfaces - server machines likely to have more than one interface -->
   <!-- The messaging topic - the "name" is also used by the persister config below -->
   <!--
   <hz:topic id="topic" instance-ref="webframework.cluster.slingshot" name="slingshot-topic"/>
   <hz:hazelcast id="webframework.cluster.slingshot">
      <hz:config>
         <hz:group name="slingshot" password="alfresco"/>
         <hz:network port="5801" port-auto-increment="true">
            <hz:join>
               <hz:multicast enabled="true"
                     multicast-group="224.2.2.5"
                     multicast-port="54327"/>
               <hz:tcp-ip enabled="false">
                  <hz:members></hz:members>
               </hz:tcp-ip>
            </hz:join>
            <hz:interfaces enabled="false">
               <hz:interface>192.168.1.*</hz:interface>
            </hz:interfaces>
         </hz:network>
      </hz:config>
   </hz:hazelcast>

   <bean id="webframework.cluster.clusterservice" class="org.alfresco.web.site.ClusterTopicService" init-method="init">
      <property name="hazelcastInstance" ref="webframework.cluster.slingshot" />
      <property name="hazelcastTopicName"><value>slingshot-topic</value></property>
   </bean>
   -->

</beans>

I obviously uncommented the whole section and configured it properly for the Share Clustering. The above content is only the default/sample content, nothing more.

Once configured, I restarted Alfresco but it failed with the following messages:

24-Aug-2019 14:35:12.974 INFO [main] org.apache.catalina.core.StandardService.startInternal Starting service [Catalina]
24-Aug-2019 14:35:12.974 INFO [main] org.apache.catalina.core.StandardEngine.startInternal Starting Servlet Engine: Apache Tomcat/8.5.34
24-Aug-2019 14:35:12.988 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDescriptor Deploying configuration descriptor [/opt/tomcat/conf/Catalina/localhost/share.xml]
Aug 24, 2019 2:35:15 PM org.apache.jasper.servlet.TldScanner scanJars
INFO: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
Aug 24, 2019 2:35:15 PM org.apache.catalina.core.ApplicationContext log
INFO: No Spring WebApplicationInitializer types detected on classpath
Aug 24, 2019 2:35:15 PM org.apache.catalina.core.ApplicationContext log
INFO: Initializing Spring root WebApplicationContext
2019-08-23 14:35:16,052  WARN  [factory.xml.XmlBeanDefinitionReader] [localhost-startStop-1] Ignored XML validation warning
 org.xml.sax.SAXParseException; lineNumber: 18; columnNumber: 92; schema_reference.4: Failed to read schema document 'https://hazelcast.com/schema/spring/hazelcast-spring-2.4.xsd', because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>.
	at java.xml/com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:204)
	at java.xml/com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.warning(ErrorHandlerWrapper.java:100)
	at java.xml/com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:392)
	at java.xml/com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:306)
	at java.xml/com.sun.org.apache.xerces.internal.impl.xs.traversers.XSDHandler.reportSchemaErr(XSDHandler.java:4218)
  ... 69 more
Caused by: java.net.ConnectException: Connection refused (Connection refused)
	at java.base/java.net.PlainSocketImpl.socketConnect(Native Method)
	at java.base/java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:399)
	at java.base/java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:242)
	... 89 more
...
2019-08-23 14:35:16,067  ERROR [web.context.ContextLoader] [localhost-startStop-1] Context initialization failed
 org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: Failed to import bean definitions from relative location [surf-config.xml]
Offending resource: class path resource [web-application-config.xml]; nested exception is org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: Failed to import bean definitions from URL location [classpath*:alfresco/web-extension/*-context.xml]
Offending resource: class path resource [surf-config.xml]; nested exception is org.springframework.beans.factory.xml.XmlBeanDefinitionStoreException: Line 18 in XML document from file [/opt/tomcat/shared/classes/alfresco/web-extension/custom-slingshot-application-context.xml] is invalid; nested exception is org.xml.sax.SAXParseException; lineNumber: 18; columnNumber: 92; cvc-complex-type.2.4.c: The matching wildcard is strict, but no declaration can be found for element 'hz:topic'.
	at org.springframework.beans.factory.parsing.FailFastProblemReporter.error(FailFastProblemReporter.java:68)
	at org.springframework.beans.factory.parsing.ReaderContext.error(ReaderContext.java:85)
	at org.springframework.beans.factory.parsing.ReaderContext.error(ReaderContext.java:76)
  ... 33 more
Caused by: org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: Failed to import bean definitions from URL location [classpath*:alfresco/web-extension/*-context.xml]
Offending resource: class path resource [surf-config.xml]; nested exception is org.springframework.beans.factory.xml.XmlBeanDefinitionStoreException: Line 18 in XML document from file [/opt/tomcat/shared/classes/alfresco/web-extension/custom-slingshot-application-context.xml] is invalid; nested exception is org.xml.sax.SAXParseException; lineNumber: 18; columnNumber: 92; cvc-complex-type.2.4.c: The matching wildcard is strict, but no declaration can be found for element 'hz:topic'.
	at org.springframework.beans.factory.parsing.FailFastProblemReporter.error(FailFastProblemReporter.java:68)
	at org.springframework.beans.factory.parsing.ReaderContext.error(ReaderContext.java:85)
	at org.springframework.beans.factory.parsing.ReaderContext.error(ReaderContext.java:76)
	... 42 more
Caused by: org.springframework.beans.factory.xml.XmlBeanDefinitionStoreException: Line 18 in XML document from file [/opt/tomcat/shared/classes/alfresco/web-extension/custom-slingshot-application-context.xml] is invalid; nested exception is org.xml.sax.SAXParseException; lineNumber: 18; columnNumber: 92; cvc-complex-type.2.4.c: The matching wildcard is strict, but no declaration can be found for element 'hz:topic'.
	at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:397)
	at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:335)
	at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:303)
	... 44 more
Caused by: org.xml.sax.SAXParseException; lineNumber: 18; columnNumber: 92; cvc-complex-type.2.4.c: The matching wildcard is strict, but no declaration can be found for element 'hz:topic'.
	at java.xml/com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:204)
	at java.xml/com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.error(ErrorHandlerWrapper.java:135)
	at java.xml/com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:396)
	... 64 more
...
24-Aug-2019 14:35:16.196 SEVERE [localhost-startStop-1] org.apache.catalina.core.StandardContext.startInternal One or more listeners failed to start. Full details will be found in the appropriate container log file
24-Aug-2019 14:35:16.198 SEVERE [localhost-startStop-1] org.apache.catalina.core.StandardContext.startInternal Context [/share] startup failed due to previous errors
Aug 24, 2019 2:35:16 PM org.apache.catalina.core.ApplicationContext log
...

As you can see above, the message is pretty clear: there is a problem within the file “/opt/tomcat/shared/classes/alfresco/web-extension/custom-slingshot-application-context.xml” which is causing Share to fail to start properly. The first warning message points you directly to the issue: “Failed to read schema document ‘https://hazelcast.com/schema/spring/hazelcast-spring-2.4.xsd’”

After checking the content of the sample file and comparing it with a working one, I found out what was wrong. To solve this specific issue, you can simply replace “https://hazelcast.com/schema/spring/hazelcast-spring-2.4.xsd” with “http://www.hazelcast.com/schema/spring/hazelcast-spring-2.4.xsd“. Please note the two differences in the URL:

Switch from “https” to “http“
Switch from “hazelcast.com” to “www.hazelcast.com“

The issue was actually caused by the fact that this installation was completely offline, with no access to internet. Because of that, Spring wasn’t able to check for the XSD file to validate the definition in the context file. The solution is therefore to switch the URL to http with www.hazelcast.com so that the Spring internal resolution can understand and use the local file to do the validation and not look for it online.

As mentioned previously, I never faced this issue before for two main reasons:

I usually don’t use the sample files provided by Alfresco, I always prefer to build my own
I mainly install Alfresco on servers which have internet access (outgoing communications allowed)

Once the URL is corrected, Alfresco Share is able to start and the Clustering is configured properly:

24-Aug-2019 14:37:22.558 INFO [main] org.apache.catalina.core.StandardService.startInternal Starting service [Catalina]
24-Aug-2019 14:37:22.558 INFO [main] org.apache.catalina.core.StandardEngine.startInternal Starting Servlet Engine: Apache Tomcat/8.5.34
24-Aug-2019 14:37:22.573 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDescriptor Deploying configuration descriptor [/opt/tomcat/conf/Catalina/localhost/share.xml]
Aug 24, 2019 2:37:24 PM org.apache.jasper.servlet.TldScanner scanJars
INFO: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
Aug 24, 2019 2:37:25 PM org.apache.catalina.core.ApplicationContext log
INFO: No Spring WebApplicationInitializer types detected on classpath
Aug 24, 2019 2:37:25 PM org.apache.catalina.core.ApplicationContext log
INFO: Initializing Spring root WebApplicationContext
Aug 24, 2019 2:37:28 PM com.hazelcast.impl.AddressPicker
INFO: Resolving domain name 'share_n1.domain' to address(es): [10.10.10.10]
Aug 24, 2019 2:37:28 PM com.hazelcast.impl.AddressPicker
INFO: Resolving domain name 'share_n2.domain' to address(es): [127.0.0.1, 10.10.10.11]
Aug 24, 2019 2:37:28 PM com.hazelcast.impl.AddressPicker
INFO: Interfaces is disabled, trying to pick one address from TCP-IP config addresses: [share_n1.domain/10.10.10.10, share_n2.domain/10.10.10.11, share_n2.domain/127.0.0.1]
Aug 24, 2019 2:37:28 PM com.hazelcast.impl.AddressPicker
INFO: Prefer IPv4 stack is true.
Aug 24, 2019 2:37:28 PM com.hazelcast.impl.AddressPicker
INFO: Picked Address[share_n2.domain]:5801, using socket ServerSocket[addr=/0:0:0:0:0:0:0:0,localport=5801], bind any local is true
Aug 24, 2019 2:37:28 PM com.hazelcast.system
INFO: [share_n2.domain]:5801 [slingshot] Hazelcast Community Edition 2.4 (20121017) starting at Address[share_n2.domain]:5801
Aug 24, 2019 2:37:28 PM com.hazelcast.system
INFO: [share_n2.domain]:5801 [slingshot] Copyright (C) 2008-2012 Hazelcast.com
Aug 24, 2019 2:37:28 PM com.hazelcast.impl.LifecycleServiceImpl
INFO: [share_n2.domain]:5801 [slingshot] Address[share_n2.domain]:5801 is STARTING
Aug 24, 2019 2:37:28 PM com.hazelcast.impl.TcpIpJoiner
INFO: [share_n2.domain]:5801 [slingshot] Connecting to possible member: Address[share_n1.domain]:5801
Aug 24, 2019 2:37:28 PM com.hazelcast.nio.ConnectionManager
INFO: [share_n2.domain]:5801 [slingshot] 54991 accepted socket connection from share_n1.domain/10.10.10.10:5801
Aug 24, 2019 2:37:29 PM com.hazelcast.impl.Node
INFO: [share_n2.domain]:5801 [slingshot] ** setting master address to Address[share_n1.domain]:5801
Aug 24, 2019 2:37:35 PM com.hazelcast.cluster.ClusterManager
INFO: [share_n2.domain]:5801 [slingshot]

Members [2] {
	Member [share_n1.domain]:5801
	Member [share_n2.domain]:5801 this
}

Aug 24, 2019 2:37:37 PM com.hazelcast.impl.LifecycleServiceImpl
INFO: [share_n2.domain]:5801 [slingshot] Address[share_n2.domain]:5801 is STARTED
2019-08-23 14:37:37,664  INFO  [web.site.ClusterTopicService] [localhost-startStop-1] Init complete for Hazelcast cluster - listening on topic: share_hz_test
...

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Alfresco – Share Clustering fail with ‘Ignored XML validation warning’

Morgan Patou

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