Tomcat Vs Weblogic Vs JBOSS

I planned to start developing server application where the number of concurrent request to the container will be high, so which server I can choose. Can anyone diffentiate all J2EE servers.
Thank you

paste from other forum
Tomacat is a webserver that can handels only HTTP protocol,,,while Weblogic is an applicatin server that handels FTP and HTTP both
Weblogic can run EJBs but Tomcat cant
You can do database connection pooling in Weblogic by usinng JNDI inteface but in tomcat you cant do so ,,,some versions of tomcat also supports connection pooling ,but not all
if u want to get your application run having EJBs and servlets as well as JSP
u ave to use both
App server and webserver
Weblogic never get tomcat bundeled in it
but app server Jboss have tomcat bundeled in it

Similar Messages

Tomcat to Weblogic

Hi there,
I really need help here. Trying to deploy a tomcat web application on Weblogic, and didn't work.
What I did:
1, upload the webapp folder of the web application, onto Weblogic / user_projects/ domain / base_domain
2, login into Console, find the webapp folder, and deploy it in the AdminServer
3, try browse the web application, and got all different kind of errors (Unable to open database connection, or Unable to compile the stylesheet, or Sytax errors..)
I have written up a simple mysql test servlet and deploy it and test it and it works......
I also got whole bunch of errors when AdminServer starts up:
Ignoring: unable to load class:java.lang.ClassNotFoundException: com.pageseeder.review.NewReviewExplorer at: weblogic.xml.schema.binding.util.ClassUtil.loadClass(ClassUtil.java:76)
When processing WebService module 'webapp'. Failed to load servlet Class: com.pageseeder.review.ReviewSpace
Really out of my mind, first time using Weblogic, and have no idea where to start debug this issue.
Please any ideas? I can open the server port and give the login/pwd if needed.
Thanks!
cheney

Hi Jay,
This is a great information and really points me to a right direction. However, things are always not going smooth as I imagine, once I put in:
<container-descriptor>
<prefer-web-inf-classes>true</prefer-web-inf-classes>
</container-descriptor>
into weblogic.xml, my application failed to load. Here is what I got from screen:
<May 5, 2010 10:06:16 AM EST> <Error> <HTTP> <BEA-101216> <Servlet: "com.pageseeder.layout.UIMappingServlet" failed to preload on startup in Web application: "webapp".
java.lang.LinkageError: loader constraint violation: loader (instance of weblogic/utils/classloaders/ChangeAwareClassLoader) previously initiated loading for a different type with name "org/xml/sax/XMLReader"
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
at weblogic.utils.classloaders.GenericClassLoader.defineClass(GenericClassLoader.java:344)
at weblogic.utils.classloaders.GenericClassLoader.findLocalClass(GenericClassLoader.java:301)
I have no idea about this error.....

Migration from tomcat to weblogic 10.3.2

Hi,
I am developing a web application, its a servlet which basically acts as a front end for a web service,
and I use CXF for the web service client, tested under a development tomcat instance and worked fine.
I have the spring framework and the rest jars in the lib:
wsdl4j-1.6.1.jar
wss4j-1.5.8.jar
jaxb-api-2.0.jar
cxf-2.2.3.jar
while I try to migrate to weblogic 10.3.2 follow the change as in
http://cxf.apache.org/docs/application-server-specific-configuration-guide.html#ApplicationServerSpecificConfigurationGuide-WebLogic
Then I got the exception:
java.lang.IncompatibleClassChangeError: Class com.ibm.wsdl.DefinitionImpl does not implement the requested interface javax.wsdl.extensions.AttributeExtensible
at org.apache.cxf.wsdl11.WSDLServiceBuilder.copyExtensionAttributes(WSDLServiceBuilder.java:137)
at org.apache.cxf.wsdl11.WSDLServiceBuilder.buildServices(WSDLServiceBuilder.java:277)
I have been research on this problem for a while, found some posts from experts like Dan on Nable...
but I still didn't get it, could anyone help on this.
Joelking

can u let us know how did you resolve this?

Change tomcat default port with JBoss

Hello,
I was looking for the server.xml file for tomcat that's deployed with jboss to change its port but I cannot seem to find that file. Question: how to change the port setting for tomcat that's shipped with jboss 3.2.3?
Thanks in advance!
Alan
09:00:45,554 INFO [SARDeployer] nested deployment: file:/C:/user/product/JBoss/jboss-3.2.
3-src/build/output/jboss-3.2.3/server/default/deploy/jbossweb-tomcat41.sar/tomcat41-servic
e.jar
09:00:46,676 INFO [STDOUT] Apache Tomcat/4.1.29
09:00:46,796 ERROR [Http11Protocol] Error initializing endpoint
java.net.BindException: Address already in use: JVM_Bind:8080
at org.apache.tomcat.util.net.PoolTcpEndpoint.initEndpoint(PoolTcpEndpoint.java:30
2)
at org.apache.coyote.http11.Http11Protocol.init(Http11Protocol.java:184)

sorry, it is in the jboss-service.xml file and here is my modification (8080 to 8088)

<Connector className="org.apache.coyote.tomcat4.CoyoteConnector"
address="${jboss.bind.address}" port="8088" minProcessors="2" maxProcessors="100"
enableLookups="true" acceptCount="10" debug="0"
connectionTimeout="20000" useURIValidationHack="false"/>
JMi

Context.xml for Tomcat using Weblogic JMS

Hello,
          has anyone succeeded in getting Tomcat to use a queue hosted by Weblogic? If so, could you please post a snippet of your context.xml with the <Resource>... sections appropriate? My last attempt drowned in a sea of bizarre security exceptions and hasn't been seen since.
          Thanks,
          Richard

Tom,
          I'll see what happens when I move things about, but really, there's a difference here. One of the issues here is that Tomcat needs a class that implements the ReferenceFactory interface for its configuration. I can't find such a class in the Weblogic docs, but I might have it all wrong or be looking in the wrong place. Hence, my question.
          The weblogic jar is not in the Tomcat classpath, it's in the WEB-INF/lib directory of the war file I'm working with.

Migrating from Weblogic to JBoss

Hello,
I am not sure if this is the right place to post this since I am part of a team that is migrating an application from Weblogic 11g to JBoss Enterprise Platform 5.0.1.CR2. I know that part of this is to change the existing weblogic.xml file over to a jboss.xml file. I have seen some things online about using XLST stylesheets to do this, I believe, at runtime but this really isn't an option for me. I'm looking to see if there is either a methodoligy that I need to use when converting it over from JBoss to Weblogic or if there is some kind of tool that I can use that I give some information and it does the conversion or if I need to use something like the XLST but I only need to use it once and it converts my code. Below is my weblogic.xml file. Any help would be appreciated.
<?xml version="1.0" encoding="UTF-8"?>
<!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>
    <description>
        sensitive
    </description>
    
    <session-descriptor>
         <session-param>
            <param-name>TimeoutSecs</param-name>
            <param-value>120</param-value>            
        </session-param>
        <session-param>
            <param-name>URLRewritingEnabled</param-name>
            <param-value>false</param-value>
        </session-param>
        <session-param>
            <param-name>CookiesEnabled</param-name>
            <param-value>false</param-value>
        </session-param>
    </session-descriptor>
    <jsp-descriptor>
        <jsp-param>
            <param-name>compileFlags</param-name>
            <param-value>-g</param-value>
        </jsp-param>
        <jsp-param>
            <param-name>keepgenerated</param-name>
            <param-value>true</param-value>
        </jsp-param>
    </jsp-descriptor>
    <container-descriptor>
        <prefer-web-inf-classes>true</prefer-web-inf-classes>
    </container-descriptor>
    <context-root>sensitive</context-root>
</weblogic-web-app>I also have a web.xml file that was told needed to be changed.
<?xml version="1.0" encoding="UTF-8"?>



<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
    <display-name>Application</display-name>
    <context-param>
        <param-name>log4jConfigLocation</param-name>
        <param-value>classpath:log4j.properties</param-value>
    </context-param>
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>
            classpath:/foundation-core-context.xml,
            classpath:/integration-context.xml,
            classpath:/integration-core-context.xml,
            classpath:/service-context.xml,
            classpath:/controller-servlet.xml,
            classpath:/controller-support.xml,
            classpath:/override-context.xml
        </param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <servlet>
        <servlet-name>log4j</servlet-name>
        <servlet-class>sensitive.servlet.Log4jServlet</servlet-class>
        <init-param>
            <param-name>config</param-name>
            <param-value>/WEB-INF/classes/log4j.properties</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
      </servlet>
    <servlet>
        <servlet-name>action</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>namespace</param-name>
            <param-value>classes/controller-servlet</param-value>
        </init-param>
        <load-on-startup>2</load-on-startup>
    </servlet>
    <servlet>
        <servlet-name>errorHandlerServlet</servlet-name>
        <servlet-class>sensitive.servlet.ErrorServlet</servlet-class>
        <init-param>
            <param-name>errorPage</param-name>
            <param-value>/WEB-INF/error.jsp</param-value>
        </init-param>
      </servlet>
    <servlet-mapping>
        <servlet-name>log4j</servlet-name>
        <url-pattern>/log4j</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>action</servlet-name>
        <url-pattern>/list/*</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>errorHandlerServlet</servlet-name>
        <url-pattern>/errorHandlerServlet</url-pattern>
    </servlet-mapping>
    
    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>
    <error-page>
        <error-code>400</error-code>
        <location>/WEB-INF/errorPages/400errorPage.jsp</location>
      </error-page>
     <error-page>
        <error-code>403</error-code>
        <location>/WEB-INF/errorPages/403errorPage.jsp</location>
      </error-page>
      <error-page>
        <error-code>404</error-code>
        <location>/WEB-INF/errorPages/404errorPage.jsp</location>
      </error-page>
      <error-page>
        <error-code>408</error-code>
        <location>/WEB-INF/errorPages/408errorPage.jsp</location>
      </error-page>
      <error-page>
        <error-code>500</error-code>
        <location>/WEB-INF/errorPages/500errorPage.jsp</location>
      </error-page>
      <error-page>
        <error-code>503</error-code>
        <location>/WEB-INF/errorPages/503errorPage.jsp</location>
      </error-page>
      <error-page>
        <error-code>504</error-code>
        <location>/WEB-INF/errorPages/504errorPage.jsp</location>
      </error-page>
      <error-page>
        <error-code>505</error-code>
        <location>/WEB-INF/errorPages/505errorPage.jsp</location>
      </error-page>
      <error-page>
          <exception-type>java.lang.Throwable</exception-type>
          <location>/errorHandlerServlet</location>
      </error-page>
      <taglib>
        <taglib-uri>http://java.sun.com/jstl/core</taglib-uri>
        <taglib-location>/WEB-INF/tld/c.tld</taglib-location>
    </taglib>
</web-app>

I'm fairly sure you're not going to get a response on an Oracle forum - but good on you for trying ;)
Shoot me a mail at at rich dot sharples at redhat dot com

# of Connections between Web Server (Tomcat) and Weblogic AppServer

Hi guys,
          does anybody know how many connections are used between a TomCat WebServer and the Weblogic ApplicationServer?
          - One?
          - One per active browser-user?
          - Configurable? (freely, in some ranges, which values are recommandable?)
          Does anybody has some links to related documentation maybe?
          Answers would be very helpful.
          Thanx in advance!
          Markus


Hi,
While not an exact solution to your problem, I seem to recall a similar issue, not with this web server though, but similar still. As far as I recall, the problem was related to the loading order of the library files and overlapping class files within those libraries. I think it was an issue with j2ee.jar/javaee.jar and jbossall-client.jar.
For the standalone test, you have probably checked the following, but check again :)
- Exact same JDK
- Libraries in the web server lib directory
- Libraries in application/WEB-INF/lib
- Loading order
You might also want to check how war file class loading is done in the web server sp6.
Other links of interest:
[javax.xml.soap.SOAPException known versions|http://www.jarfinder.com/index.php/java/info/javax.xml.soap.SOAPException]
Cheers,
Øyvind

Weblogic and JBoss-like "automatic method calls"

As I understand, JBoss has a nice feature where you can tell the
container to call a class (or method?) just before a call to a bean
method is executed.
Example:
You have a bean called FooBean that you want to execute method bar()
on. Then you have a class Authenticate that handles, TADA,
authentication. You call fooBean.bar() (yes, I know you first lookup
the interfaces and so on but this is for simplicity... ;) ). In JBoss
you can tell the container to make a call to class Authenticate before
fooBean.bar() executes. This is really nice.
Does anyone know if Weblogic 6.1/7.0 has this feature?

Check the interceptor example at http://dima.dhs.org/misc/ejbproxy.jsp
"Weasel" <[email protected]> wrote in message
news:[email protected]..
As I understand, JBoss has a nice feature where you can tell the
container to call a class (or method?) just before a call to a bean
method is executed.

Weblogic 91 Jboss Pojo Cache and JConsole Issue

Hi ,
The set up is like this ,
JBoss Pojo Cache is used for caching on Weblogic 9.1, trying to use JConsole (Sun) to connect to the managed server's mbean server to get the Pojo Cache.
Am getting the following exception on the server, Any suggestions/help would be great
<Jul 20, 2006 2:30:54 PM PDT> <Warning> <RMI> <BEA-080003> <RuntimeException thrown by rmi server
javax.management.remote.rmi.RMIConnectionImpl.getAttribute(Ljavax.management.ObjectName;Ljava.lan
String;Ljavax.security.auth.Subject;)
java.lang.ClassCastException: org.jboss.cache.aop.TreeCacheAop.
java.lang.ClassCastException: org.jboss.cache.aop.TreeCacheAop
at weblogic.iiop.IIOPOutputStream.writeAny(IIOPOutputStream.java:1534)
at weblogic.iiop.IIOPOutputStream.writeObject(IIOPOutputStream.java:2172)
at javax.management.remote.rmi.RMIConnectionImpl_WLSkel.invoke(Unknown Source)
at weblogic.rmi.internal.BasicServerRef.invoke(BasicServerRef.java:517)
at weblogic.rmi.internal.BasicServerRef$1.run(BasicServerRef.java:407)
Truncated. see log file for complete stacktrace
>

Shirish Goel <> writes:
Looks like a serialization issue. You should check the definition of TreeCacheAop.
andy
Hi ,
The set up is like this ,
JBoss Pojo Cache is used for caching on Weblogic 9.1, trying to use JConsole (Sun) to connect to the managed server's mbean server to get the Pojo Cache.
Am getting the following exception on the server, Any suggestions/help would be great
<Jul 20, 2006 2:30:54 PM PDT> <Warning> <RMI> <BEA-080003> <RuntimeException thrown by rmi server
javax.management.remote.rmi.RMIConnectionImpl.getAttribute(Ljavax.management.ObjectName;Ljava.lan
String;Ljavax.security.auth.Subject;)
java.lang.ClassCastException: org.jboss.cache.aop.TreeCacheAop.
java.lang.ClassCastException: org.jboss.cache.aop.TreeCacheAop
at weblogic.iiop.IIOPOutputStream.writeAny(IIOPOutputStream.java:1534)
at weblogic.iiop.IIOPOutputStream.writeObject(IIOPOutputStream.java:2172)
at javax.management.remote.rmi.RMIConnectionImpl_WLSkel.invoke(Unknown Source)
at weblogic.rmi.internal.BasicServerRef.invoke(BasicServerRef.java:517)
at weblogic.rmi.internal.BasicServerRef$1.run(BasicServerRef.java:407)
Truncated. see log file for complete stacktrace

Migrating Application from Weblogic to JBOSS

Hi all,
I have an requirement to migrate Application running in Weblogic 8.1 to JBOSS, However my biggest problem is i do not have my JSP files and have only JSP converted Class files which are currently decomplied JAVA files and used in place of JSP. While migating to JBOSS my JSP converted JAVA files are erroring out.
Can any body please help me out. Thanks in advance for the help.

can be any body help me out with this issue

Tomcat Vs Weblogic .. jsp/html file path issue..

Tomcat gurus, please help !!!
Development Env. :
OS: Window NT 4.0 SP6
Web Server: Tomcat 4.1.12
Sun JDK 1.3.1
IDE : Eclipse 2.1
Deployment/Testing/Prod Env:
OS: Sun Solaris 2.8
Web Server: Weblogic 5.1 SP 12
Sun JDK 1.3.1 IDE : N/A
Confession: New to Tomcat world.
Note: Reason why I'm using Tomcat for development though I can use Weblogic, Eclipse IDE with Tomcat plugin provides debuging functionality, thus the problem. I have an enterprise application being built and kind of stepped into a problem. I have a Servlet that marshals all the calls and process them through java beans ( about 50+ ) and content displayed through JSPs.
Here is the directory structure,
/AppContext
| +- src
| +- com.xyz.wfservices
+- jsp
main.jsp
+- WEB-INF
|
+ classes
+ com.xyz.wfservices ( compiled classes )
For Weblogic: It has 2 parameters to specify where the compiled code is and where the docs are,
=> weblogic.httpd.servlet.classpath=c:/wfservices/WEB-INF/classes
=> weblogic.httpd.documentRoot= c:/wfservices/src/html
and to register instance,
weblogic.httpd.register.WfServices=com.xyz.wfservices.WfSvcsController
weblogic.httpd.initArgs.WfServices=\
     main.properties=c:/wfservices/src/properties/wfservices.properties
But, I looked at Tomcat it is quite different.. it has <Context path="/wfs" docBase="L:\app_services\wfservices" workDir="L:\app_services\wfservices\work" /> Servlet def in web.xml
<servlet>
<servlet-name>WfServices</servlet-name>
<servlet-class>com.xyz.wfservices.WfSvcsController</servlet-class>
<init-param>
<param-name>main.properties</param-name>
<param-value>c:\wfservices\properties\config.properties</param-value>
</init-param>
     <servlet-mapping>
          <servlet-name>WfServices</servlet-name>
          <url-pattern>/WfServices</url-pattern>
     </servlet-mapping>
</servlet>
Probem: Accessing JSP/Html ... documents. weblogic accessing / calling jsp ..
     rd = req.getRequestDispatcher("/main.jsp");      //req is HttpRequest
     if (rd != null)
          rd.forward(req, resp);
The same does not work under Tomcat because it can find files relative to the context, thus it fails. I have to change the code like below to make it work.
     rd = req.getRequestDispatcher("/src/jsp/main.jsp");
     if (rd != null)
          rd.forward(req, resp);
It is a nightmare now to maintain two different environments and more over changing all the references and and its internal references is not feasible. The question is, is there a way to configure docBase in tomcat so that I won't need a code change.
Any help or inputs are greatly appreciated.
Thanks
Meher

I ran into this same problem before, so I created a utility class that would map out a URI or URL given a relative path. It's nice because it will detect and include non-standard ports for both the HTTP and HTTPS protocols. If you access a servlet/jsp using HTTP, it will return a URL for the HTTP protocol and the same for HTTPS. So, that means you don't need any code changes to access things through HTTP or HTTPS :) Here it is, hope it helps you out:
import javax.servlet.*;
import javax.servlet.http.*;
public class ContextMapper
    private static final int HTTP_PORT = 80;
    private static final int HTTPS_PORT = 443;
     * This method will return a URI to access a resource given its relative
     * path. Please note that the relative path should start in the directory
     * where the web application is deployed to.
     * @param HttpServletRequest request
     * @param HttpServletResponse response
     * @param String relativePath
     * @return String
    public static String getUri (HttpServletRequest request, HttpServletResponse response, String relativePath)
        return request.getContextPath() + relativePath;
     * This method will return a URL to access a resource given its relative
     * path. Please note that the relative path should start in the directory
     * where the web application is deployed to. Also, the protocol will be
     * automatically detected from the request. Supported protocols include
     * HTTP and HTTPS. For all other protocols, the relative path will be
     * returned unmodified.
     * @param HttpServletRequest request
     * @param HttpServletResponse response
     * @param String relativePath
     * @return String
    public static String getUrl (HttpServletRequest request, HttpServletResponse response, String relativePath)
        if (request.getProtocol().startsWith("HTTP/") == true)
            switch (request.getServerPort())
                case HTTP_PORT:
                    return "http://" + request.getServerName() + request.getContextPath() + relativePath;
                default:
                    return "http://" + request.getServerName() + ":" + request.getServerPort() + request.getContextPath() + relativePath;
        else if (request.getProtocol().startsWith("HTTPS/") == true)
            switch (request.getServerPort())
                case HTTPS_PORT:
                    return "https://" + request.getServerName() + request.getContextPath() + relativePath;
                default:
                    return "https://" + request.getServerName() + ":" + request.getServerPort() + request.getContextPath() + relativePath;
        else
            return relativePath;
}Here are a few examples of using this class:
String uri = ContextMapper.getUri(request, response, "/css/basic.css");
String url = ContextMapper.getUrl(request, response, "/css/basic.css");
String uri = ContextMapper.getUri(request, response, "/images/image.gif");
String url = ContextMapper.getUrl(request, response, "/images/image.gif");
String uri = ContextMapper.getUri(request, response, "/jsp/HelloWorld.jsp");
String url = ContextMapper.getUrl(request, response, "/jsp/HelloWorld.jsp");
String uri = ContextMapper.getUri(request, response, "/servlet/HelloWorld");
String url = ContextMapper.getUrl(request, response, "/servlet/HelloWorld");

Weblogic to JBoss Migration Steps Needed

Hi,
I am migrating from Web-logic 10.0 to JBoss 6.0. What are the migration steps I need to take care?
Any links is highly appreciated. I am looking at the following points:-
Code Organization
Deployment Descriptors
Security
JNDI (DataSource, JMS, etc)
EJB migration
Third Party Libraries
Clustering support
Thanks.

Guys any response for this?

Tomcat calling weblogic applet

Does anyone know how to get by this exception. java.security.AccessControlException:
access denied (java.net.SocketPermission ) I'm running a web app that calls
an applet sitting on weblogic 6.1. Whenever I try to call it, it gives me the
socketPermission error. What do I have to do to get by this?
Thanks

I have managed to do this, but perhaps the way I have done it is a bit long-winded and there may be an easier (better) way. Also, note that this method is for applets on the same web site only.
The answer lies in Javascript, where a Javascript method can call an Applet method. Therefore, if one applet can communicate with the web-page via Javascript, then any other applets on that page can communicate with any other applets there.
This is an example piece of Javascript code to show u what I mean:
function callAppletMethod()
var str = window.parent.VerifyApp.check();
etc...
}Here, the variable 'str' gains the value returned by the method 'check()' in the applet called VerifyApp.
There is other ways to communicate between applets and Javascript, but I think they are for Netscape Navigator browsers only.
Anyway, hope that helps.

What is net step for tomcat? jboss

Hi all,
I have almost two years experience in tomcat, I want to continue developer my skills on j2ee, hope that is not a stupid Ideal.
recently, I try WebLogic by myself . but I am not sure Weblogic is free or not ? some said the licence is one year, I am new in java developer, my next hire, problem still not a big company, for the cost reason, may still need to chose a free software, is jboss is the next step I should try?
right now my server have tomcat + MS sql , can I install jboss in the same server(Windows 2003) without any bad effect on Tomcat? before master jboss, I still need let tomcat work smoontly.
by the way j2ee also a server. which one is best? j2ee server or Jboss?
Thank you

hi,
Weblogic is not free. But, Jboss is avail for free download. You can download it and install in your system and that wont affect your tomcat in anyway. (unless you run the both simultaneously !! )
j2ee server or jboss?
I assume you mean 'Sun application server' by the term 'j2ee server'. But, jboss is very popular, so you can go for it.
Also, recently JbossIDE became very popular, as it provides rich user interface for j2ee application development using jboss.
Good luck! :)

What is the role of J2EE compared with WebLogic and Tomcat?

Now that J2EE play the role of Web Services Container and Logic Services Container
What does WebLogic do?and What does Tomcat do?
Do they collided with each other?

WebLogic (and WebSphere, JBoss, and Sun ONE) are all J2EE application servers. Each of them has an HTTP server and servlet/JSP engines built-in. They can handle HTML pages, JSPs, EJBs, messaging, transactions, two-phase commit to databases, etc.
Tomcat is just a servlet/JSP engine with an HTTP server built in. It can handle HTML pages, servlets, and JSPs, but it can't run EJBs for you. If you want to stick EJBs into a servlet or JSP, you'll have to get them from a J2EE app server.
No, WebLogic is a superset of Tomcat. It has an HTTP server and a servlet/JSP engine, so WebLogic can happily exist without Tomcat.
If you'd like, you can have both Tomcat and WebLogic. Let Tomcat handle the servlet and JSP requests and leave the EJB enterprise stuff to WebLogic. You might use this arrangement when you'd like to have a Tomcat server running in a DMZ and a WebLogic app server inside the second firewall. Tomcat can then do authentication and forward requests back to WebLogic. - MOD

Tomcat Vs Weblogic Vs JBOSS

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