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Posted to users@tomcat.apache.org by "Roberto Bottoni (Modernviaggi)" <ro...@modernviaggi.com> on 2007/04/04 19:08:26 UTC
Share Bean between two webapps
I spend several hours to do this :
I want to share a javabean between two different webapps .... i want to get
fields and methods of a javabean that is stored in webapp2 from webapps1
I use Tomcat 5.0 and i have read
http://tomcat.apache.org/tomcat-5.0-doc/jndi-resources-howto.html but i get
no success!
Please.. do you have a simple example??.. that is.. code and configurations
(server.xml, web.xml, context.xml...)
follow my codes...
jndiWebShare1 is the folder under tomcat\webapps of webapp1
--------------------------------------------------------------------------
SharedBean1.java .. . under jndiWebShare1\WEB-INF\com\afterbit
---------------------------------------------------------------------------
/*
* SharedBean1.java
*/
package com.afterbit;
/**
*
* @author Admin
*/
public class SharedBean1 {
/** Creates a new instance of SharedBean1 */
public SharedBean1() {
}
private String foo = "Shared Bean 1 : Value of FOO";
private int bar = 0;
public String getFoo() {
return (this.foo);
}
public void setFoo(String foo) {
this.foo = foo;
}
public int getBar() {
return (this.bar);
}
public void setBar(int bar) {
this.bar = bar;
}
}
--------------------------------------------------------------------------
context.xml .. .under jndiWebShare1\META-INF
---------------------------------------------------------------------------
<?xml version="1.0" encoding="UTF-8"?>
<Context path="/jndiWebShare1" docBase="webapps/jndiWebShare1"
crossContext="true" debug="0" reloadable="true">
<Resource name="bean/SharedBean1Factory" auth="Container"
type="com.afterbit.SharedBean1"/>
<ResourceParams name="bean/SharedBean1Factory">
<parameter>
<name>factory</name>
<value>org.apache.naming.factory.BeanFactory</value>
</parameter>
<parameter>
<name>bar</name>
<value>23</value>
</parameter>
</ResourceParams>
</Context>
--------------------------------------------------------------------------
web.xml .. .under jndiWebShare1\WEB-INF
---------------------------------------------------------------------------
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" version="2.4">
<resource-env-ref>
<description>Object factory for SharedBean1 instances.</description>
<resource-env-ref-name>bean/SharedBean1Factory</resource-env-ref-
name>
<resource-env-ref-type>com.afterbit.SharedBean1</resource-env-ref-
type>
</resource-env-ref>
</web-app>
--------------------------------------------------------------------------
index.jsp.. .JSP page with test bean under jndiWebShare1\
---------------------------------------------------------------------------
<%@page contentType="text/html"%>
<%@page pageEncoding="UTF-8"%>
<%@page import = "javax.naming.*" %>
<!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=UTF-8">
<title>JSP Page</title>
</head>
<body>
<h1>JSP Page</h1>
<%
Context initCtx = new InitialContext();
Context envCtx = (Context) initCtx.lookup("java:comp/env");
SharedBean1 bean = (SharedBean1) envCtx.lookup
("bean/SharedBean1Factory");
out.println("foo = " + bean.getFoo() + ", bar = " + bean.getBar());
%>
</body>
</html>
but I get an exception...
org.apache.jasper.JasperException: Unable to compile class for JSP
An error occurred at line: 17 in the jsp file: /index.jsp
Generated servlet error:
C:\jakarta-tomcat-5.0.27\work\Catalina\localhost\jndiWebShare1\org\apache\js
p\index_jsp.java:69: cannot resolve symbol
symbol : class SharedBean1
location: class org.apache.jsp.index_jsp
SharedBean1 bean = (SharedBean1)
envCtx.lookup("bean/SharedBean1Factory");
Of course if i put in my JSP page
<%@page import = "com.afterbit.*" %> it works...but.. SharedBean1 should be
a shared resource.. so no need to import com.afterbit..... no?!!
Thanks!
Roberto
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Re: Share Bean between two webapps
Posted by Martin Gainty <mg...@hotmail.com>.
Hi Roberto-
I think you may be speaking of demand loading multiple hierarchical
container instances in which case I would look at implementing your app with
Spring IOC (Injection of Control) and locate/allocate/init your bean via
ContextSingletonBeanFactoryLocator class
http://www.springframework.org/docs/reference/beans.html
HTH,
Martin --
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----- Original Message -----
From: "Roberto Bottoni (Modernviaggi)" <ro...@modernviaggi.com>
To: <us...@tomcat.apache.org>
Sent: Wednesday, April 04, 2007 1:08 PM
Subject: Share Bean between two webapps
>I spend several hours to do this :
> I want to share a javabean between two different webapps .... i want to
> get
> fields and methods of a javabean that is stored in webapp2 from webapps1
> I use Tomcat 5.0 and i have read
> http://tomcat.apache.org/tomcat-5.0-doc/jndi-resources-howto.html but i
> get
> no success!
> Please.. do you have a simple example??.. that is.. code and
> configurations
> (server.xml, web.xml, context.xml...)
>
> follow my codes...
> jndiWebShare1 is the folder under tomcat\webapps of webapp1
> --------------------------------------------------------------------------
> SharedBean1.java .. . under jndiWebShare1\WEB-INF\com\afterbit
> ---------------------------------------------------------------------------
> /*
> * SharedBean1.java
> */
>
> package com.afterbit;
>
> /**
> *
> * @author Admin
> */
> public class SharedBean1 {
>
> /** Creates a new instance of SharedBean1 */
> public SharedBean1() {
> }
>
> private String foo = "Shared Bean 1 : Value of FOO";
> private int bar = 0;
>
> public String getFoo() {
> return (this.foo);
> }
>
> public void setFoo(String foo) {
> this.foo = foo;
> }
>
> public int getBar() {
> return (this.bar);
> }
>
> public void setBar(int bar) {
> this.bar = bar;
> }
>
>
> }
>
>
> --------------------------------------------------------------------------
> context.xml .. .under jndiWebShare1\META-INF
> ---------------------------------------------------------------------------
> <?xml version="1.0" encoding="UTF-8"?>
> <Context path="/jndiWebShare1" docBase="webapps/jndiWebShare1"
> crossContext="true" debug="0" reloadable="true">
> <Resource name="bean/SharedBean1Factory" auth="Container"
> type="com.afterbit.SharedBean1"/>
> <ResourceParams name="bean/SharedBean1Factory">
> <parameter>
> <name>factory</name>
> <value>org.apache.naming.factory.BeanFactory</value>
> </parameter>
> <parameter>
> <name>bar</name>
> <value>23</value>
> </parameter>
> </ResourceParams>
> </Context>
>
> --------------------------------------------------------------------------
> web.xml .. .under jndiWebShare1\WEB-INF
> ---------------------------------------------------------------------------
> <?xml version="1.0" encoding="UTF-8"?>
> <web-app xmlns="http://java.sun.com/xml/ns/j2ee"
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
> xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
> http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" version="2.4">
> <resource-env-ref>
> <description>Object factory for SharedBean1 instances.</description>
> <resource-env-ref-name>bean/SharedBean1Factory</resource-env-ref-
> name>
> <resource-env-ref-type>com.afterbit.SharedBean1</resource-env-ref-
> type>
> </resource-env-ref>
> </web-app>
>
> --------------------------------------------------------------------------
> index.jsp.. .JSP page with test bean under jndiWebShare1\
> ---------------------------------------------------------------------------
> <%@page contentType="text/html"%>
> <%@page pageEncoding="UTF-8"%>
> <%@page import = "javax.naming.*" %>
>
>
> <!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=UTF-8">
> <title>JSP Page</title>
> </head>
> <body>
> <h1>JSP Page</h1>
>
> <%
>
> Context initCtx = new InitialContext();
> Context envCtx = (Context) initCtx.lookup("java:comp/env");
> SharedBean1 bean = (SharedBean1) envCtx.lookup
> ("bean/SharedBean1Factory");
> out.println("foo = " + bean.getFoo() + ", bar = " + bean.getBar());
>
> %>
> </body>
> </html>
>
>
>
> but I get an exception...
>
> org.apache.jasper.JasperException: Unable to compile class for JSP
>
> An error occurred at line: 17 in the jsp file: /index.jsp
> Generated servlet error:
> C:\jakarta-tomcat-5.0.27\work\Catalina\localhost\jndiWebShare1\org\apache\js
> p\index_jsp.java:69: cannot resolve symbol
> symbol : class SharedBean1
> location: class org.apache.jsp.index_jsp
> SharedBean1 bean = (SharedBean1)
> envCtx.lookup("bean/SharedBean1Factory");
>
> Of course if i put in my JSP page
> <%@page import = "com.afterbit.*" %> it works...but.. SharedBean1 should
> be
> a shared resource.. so no need to import com.afterbit..... no?!!
>
> Thanks!
> Roberto
>
>
> ---------------------------------------------------------------------
> To start a new topic, e-mail: users@tomcat.apache.org
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
>
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