Below are the three typical scenarios of sharing of session data by web applications.
Scenario 1) Sharing of session data and attributes by two web applications (.war) deployed across WebLogic application servers.
Scenario 2) Sharing of session data and attributes by two web applications (.war) contained in two separate Enterprise application (.ear)
Scenario 3) Sharing of session data and attributes by two web applications (.war) contained in a single Enterprise application (.ear)
The following steps provide an example for each of the above scenario.
Before executing the examples below, prepare your environment
1) Download coherence 3.6.x from
http://www.oracle.com/technetwork/middleware/coherence/downloads/index.html
2) Extract the downloaded zip to say c:\cohrence361
3) Create startcoherence.cmd file under c:\cohrence361 and copy the contents between "CUT" into it.
--------CUT-----
setlocal
if (%COHERENCE_HOME%)==() (
set COHERENCE_HOME=C:\coherence361
)
set COH_OPTS=%COH_OPTS% -server -cp C:\coherence361\lib\coherence.jar;C:\coherence361\lib\coherence-web-spi.war;
set COH_OPTS=%COH_OPTS% -Dtangosol.coherence.management.remote=true -Dtangosol.coherence.cacheconfig=/WEB-INF/classes/session-cache-config.xml -Dtangosol.coherence.session.localstorage=true
java %COH_OPTS% -Xms512m -Xmx512m com.tangosol.net.DefaultCacheServer
:exit
--------CUT-----4) from windows cmd> startcoherence.cmd. This starts the cohrence cache server.
5) Install Oracle WebLogic Server 10.3.3 by downloading from here
http://www.oracle.com/technetwork/middleware/weblogic/overview/index.html
6) Using WebLogic Domain config wizard (<W_HOME>\wlserver_10.3\common\bin\config.cmd, create a domain with three servers
a. AdminServer (listening on port 7001)
b. ManagedServer1 (listening on port 7003)
c. ManagedServer2 (listening on port 7005)
7) Deploy C:\coherence361\lib\coherence-web-spi.jar as a Shared module to the above domain and target it to ManagedServer1, ManagedServer2
8) Using Oracle Enterprise pack for Eclipse IDE (OEPE), create two dynamic web projects with the following contents.
webproject1
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name>webproject1</display-name>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name>webproject1</display-name>
<context-param>
<param-name>coherence-scopecontroller-class</param-name>
<param-value>com.tangosol.coherence.servlet.AbstractHttpSessionCollection$GlobalScopeController</param-value>
</context-param>
</web-app>
<param-name>coherence-scopecontroller-class</param-name>
<param-value>com.tangosol.coherence.servlet.AbstractHttpSessionCollection$GlobalScopeController</param-value>
</context-param>
</web-app>
weblogic.xml
<?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/1.0/weblogic-web-app.xsd">
<wls:weblogic-version>10.3.2</wls:weblogic-version>
<wls:context-root>webproject1</wls:context-root>
<wls:library-ref>
<wls:library-name>coherence-web-spi</wls:library-name>
<wls:specification-version>1.0.0.0</wls:specification-version>
<wls:implementation-version>1.0.0.0</wls:implementation-version>
<wls:exact-match>true</wls:exact-match>
</wls:library-ref>
</wls:weblogic-web-app>
WebContent/counter.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<h3>
Counter :
<%
Integer counter = new Integer(1);
HttpSession httpsession = request.getSession(true);
if (httpsession.isNew()) {
httpsession.setAttribute("count", counter);
out.println(counter);
} else {
int count = ((Integer) httpsession.getAttribute("count")).intValue();
httpsession.setAttribute("count", new Integer(++count));
out.println(count);
}
%>
</h3>
</body>
</html>
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<h3>
Counter :
<%
Integer counter = new Integer(1);
HttpSession httpsession = request.getSession(true);
if (httpsession.isNew()) {
httpsession.setAttribute("count", counter);
out.println(counter);
} else {
int count = ((Integer) httpsession.getAttribute("count")).intValue();
httpsession.setAttribute("count", new Integer(++count));
out.println(count);
}
%>
</h3>
</body>
</html>
webproject2
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name>webproject2</display-name>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name>webproject2</display-name>
<context-param>
<param-name>coherence-scopecontroller-class</param-name>
<param-value>com.tangosol.coherence.servlet.AbstractHttpSessionCollection$GlobalScopeController</param-value>
</context-param>
</web-app>
<param-name>coherence-scopecontroller-class</param-name>
<param-value>com.tangosol.coherence.servlet.AbstractHttpSessionCollection$GlobalScopeController</param-value>
</context-param>
</web-app>
<?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/1.0/weblogic-web-app.xsd">
<wls:weblogic-version>10.3.2</wls:weblogic-version>
<wls:context-root>webproject2</wls:context-root>
<wls:library-ref>
<wls:library-name>coherence-web-spi</wls:library-name>
<wls:specification-version>1.0.0.0</wls:specification-version>
<wls:implementation-version>1.0.0.0</wls:implementation-version>
<wls:exact-match>true</wls:exact-match>
</wls:library-ref>
</wls:weblogic-web-app>
WebContent/counter.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<h3>
Counter :
<%
Integer counter = new Integer(1);
HttpSession httpsession = request.getSession(true);
if (httpsession.isNew()) {
httpsession.setAttribute("count", counter);
out.println(counter);
} else {
int count = ((Integer) httpsession.getAttribute("count")).intValue();
httpsession.setAttribute("count", new Integer(++count));
out.println(count);
}
%>
</h3>
</body>
</html>
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<h3>
Counter :
<%
Integer counter = new Integer(1);
HttpSession httpsession = request.getSession(true);
if (httpsession.isNew()) {
httpsession.setAttribute("count", counter);
out.println(counter);
} else {
int count = ((Integer) httpsession.getAttribute("count")).intValue();
httpsession.setAttribute("count", new Integer(++count));
out.println(count);
}
%>
</h3>
</body>
</html>
9) From OEPE export the projects created in step #8 as webproject1.war and webproject2.war
Example for Scenario 1
1) Shut down all the weblogic server instances of the weblogic domain if they are running.
2) Copy C:\coherence361\lib\coherence.jar to under <weblogic domain>/lib directory or configure in the WebLogic system classpath. The placement of coherence.jar under <weblogic domain>/lib is really important when web projects deployed across WebLogic Aplication Server (Separate JMV instances) need to share session objects
3) Start all the three weblogic server instances
4) Deploy webproject1.war and webproject2.war and target the deployment to ManagedServer1 and ManagedServer2
5) Execute the following test case and observe that the session attribute "count" is shared between webproject1 and webproject2
Scenario 1 Test case:
1) open IE and access the url http://localhost:7003/webproject1/counter.jsp
Count =1
2) open another browser (firefox) and access the url http://localhost:7005/webproject2/counter.jsp
Count =2 (count is 2 as webproject2 adds 1 to the counter value set by webproject2
3) Try opening multiple sessions by changing the port numbers and browsers and observe that the session attribute count is getting shared between two webprojects using Coherence *Web SPI
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