WebLogic Cluster

Before You Start

You have to configure the following setting for ZK and Weblogic.

zk.xml

Turn on Serializable UI Factory for ZK, please refer to this documentation.

<zk>
    <system-config>
        <ui-factory-class>org.zkoss.zk.ui.http.SerializableUiFactory</ui-factory-class>
    </system-config>
    <!-- clustering environment, since ZK 5.0.8-->
    <listener>
        <listener-class>org.zkoss.zkplus.cluster.ClusterSessionPatch</listener-class>
    </listener>
</zk>

weblogic.xml

Add a weblogic.xml under XXX/WEB-INF folder(XXX is like ZKsandbox in the war file)

For example,

<!DOCTYPE weblogic-web-app PUBLIC "-//BEA Systems, Inc.//DTD Web Application 8.1//EN"
 "http://www.bea.com/servers/wls810/dtd/weblogic810-web-jar.dtd">

<weblogic-web-app>
  <session-descriptor>
    <session-param>
      <param-name>PersistentStoreType</param-name>
      <param-value>replicated</param-value>
    </session-param>
  </session-descriptor>
</weblogic-web-app>

For Weblogic version 12c

<?xml version="1.0" encoding="UTF-8"?>
<wls:weblogic-web-app
    xmlns:wls="http://xmlns.oracle.com/weblogic/weblogic-web-app"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd http://xmlns.oracle.com/weblogic/weblogic-web-app http://xmlns.oracle.com/weblogic/weblogic-web-app/1.5/weblogic-web-app.xsd">
    <wls:session-descriptor>
        <wls:persistent-store-type>replicated</wls:persistent-store-type>
    </wls:session-descriptor>
</wls:weblogic-web-app>

As mentioned in Weblogic’s document

replicated — Same as memory, but session data is replicated across the clustered servers.

Setting up Weblogic Clusters

After those things done above, please follow the official document to set up a Weblogic Cluster Server here.

Including zul in JSP in Weblogic

Weblogic JSP writer implementation uses response#getOutputStream for JSP blocks. Using the

<jsp:include src="foo/bar/mypage.zul">

tag in weblogic will cause the ZK layout servlet to write the zul file to response#getWriter.

This will cause an error “Cannot call outputStream because getWriter was already called”

Instead, use

<%@ taglib uri = "http://java.sun.com/jsp/jstl/core" prefix = "c" %>
<c:import var = "data" url = "foo/bar/mypage.zul"/><c:import>​

in web.xml is not used by WebLogic Server 12c. (https://docs.oracle.com/cd/E24329_01/web.1211/e21049/web_xml.htm#WBAPP510)

Version History

Version	Date	Content
5.0.8	June 2011	Add ClusterSessionPatch listener to zk.xml for enforce Weblogic to write session.

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