Hi all,I've read the book (Core J2EE Patterns) mentioned in this forum... and it's really great!!But i have a question about a - from my point of view - important topic when developing web-application.Where and how to store EJB-References?Perhaps i have not read the book carefully enough... ...

I Have sucessfully Installed J2EE server on the Windows 98I use deploytool for the deploymentc:\>deploytoolI start the server usingc:\>J2EE -Verboseit starts the serverBut when i try to call the url it gives exception even when I try http://localhost:8000/ it gives ExceptionError: ...

In my application design I use a servlet controller.Is it wise to make all the connections to the ejbs (lookups) in the init method of the servlet and save it in the ServletContext object so when I need to use it in a jsp view just to extract it from the application object?Thamk you in ...

How can I abstract the implementation of my object persistance.For example, I want to create a layer/service that will return references to persistant objects irrespective of how they are implemented e.g. EJB, Object-Oriented database, or simple Data Access Objects.Otherwise, I will have to ...

Hi I use windows 2000 ,JDK 2,j2EE1.3I use http:localhost:8000 to previewBut it show " no found server or DNS error".Please help meThanks a lotI started j2ee it show like below:J2EE server listen port: 1050Naming service started:1050Binding ...

Hi allAfter installing everything and making all PATH lines needed, i run j2ee :C:\j2ee -verboseand get error messages :"Insufficient environmental space" (16 times)"Syntax error" (3 times)"Insufficient environmental space" (1 time)"invalid command or filename" I would like to know if this ...

Hi All,Here is my doubt regarding optimum design for the web layer in a J2EE architecture.I'm following the mediator pattern (as it is in J2ee blue print - Pet Store application), i,e,. I'm having a mediator servlet which degates the requests to appropriate Controller classes (which are ...

Hi All,Here is my doubt regarding optimum design for the web layer in a J2EE architecture.I'm following the mediator pattern (as it is in J2ee blue print - Pet Store application), i,e,. I'm having a mediator servlet which degates the requests to appropriate Controller classes (which are ...

Hi, I'd just like to get clarification on one thing - if a J2EE module archive contains packages which are duplicates of those provided by the J2EE server (for example the JAXP javax.xml.* packages), which classes should be loaded at runtime? I'm presuming the J2EE server's classes get ...

Hi I want know that J2EE equal J2EE Sever?Or I must development *.ear file by J2EE then issue to webpages folder of JavaServer Web Development Kit ,is not?Please teach meThanks a lotDavid

I am trying to increase the performance of a system that makes calls to about 7 enterprise java beans. I have created a service locator object to help streamline this by putting all the jndi information here. This service locator is a singleton object. I was wondering if I could keep a local ...

I am in the process of implementing a command pattern to abstract ejb access between client and server. In the command pattern I am implementing, I am using a Command object that gets passed through the Proxy/Business Delegate to the Facade, and to the correct ejb. I have written a ...

the model i need have 3layers:JSP+EJB+SocketServer, i know EJB can act as Socket Client(not Server),but the main problem is that i must use a .dll or .lib file(written in c) in EJB to packge the socket data.someone says EJB can use JNI while EJB Spec won't allow it, i dont't want to take the ...

Hi all I received message below when used Http://localhost:8000/ Error: 500Internal Servlet Error:java.lang.NoSuchMethodErrorat com.sun.web.security.SecurityInterceptor.setSSLAttributes(SecurityInterceptor.java:56)at ...

Hi all,1. I download this file ,I found that the size is 14.2 MB,but the size of web page is 14.9 MBI can setup the fileI use windws 2000But I can't see the default page of j2ee after " http://localhost:8000"I want know the size can influence run j2ee?2. J2ee can be intead Tomcat or JSWDK ...

Hi all,What should be a good design technique in order to allow a JSP page to present some list obtained from other layer of my application. I intend to leave only presentation logic in the JSP layer, while all data access will be in other layer. For example, I have a JSP page that will show ...

Hi, I am interested in achieving data cache in Servlet/JSP technology. I understand that javax.util.jcache specifications are being brought out to achieve data cache. Can any one throw more light on javax.util.jcache as to where it is available, methods available etc.RegardsMahesh Karanth ...

Hi there, I am very new to J2ee technology and am trying Account example which comes with Sun j2dskee server.I am using the Cloudscape database.I am able to deploy the application without any problem.But when I run the client I am getting the following error.In the server console:Can't find ...

Hi there,when I run the Account example in j2ee using cloudscape,i get the errorCan't find principle mapping information for the data source with the jindi name jdbc/Cloudscapeand in command prompt: getting rmi.remotexception:couldn't create entity bean.pls helpThanks-Devi ...

1. I have compiled Applications and Applets before with success and am now getting the following error message:C:\>java GuessRandNumberAV.javaException in thread "main" java.lang.NoClassDefFoundError: GuessRandNumberAV/jaaC:\>2. I am using WINDOWS 953. This is my ...

Anyone know of a good and easy to use package that would allow one to read a Java class and manipulate methods,attributes, and class inheritance information?Thanks in advance.

I am the beginner of J2EE, If I access the J2EE server, I need to type http://localhost:8000/the port is 8000, can I use the other port instead of 8000, for example use the common port 80 instead of 8000

Hi All,I am a lover of Java.I reside at TianJin City of china.The city have eight hundred million people,and a lot of people have be very interest at Java Technical and obtained Professional Certification of java.But their study is no convenience & want for infomation of Technical.The ...

Hi, please help me, i turn crazy!! I'm trying to create a cluster with weblogic 6.1. The documentation says that each member of a cluster MUST listen to the same port number.I start the first server and everything is OK.But when i start the second server, a shutdown sequence is initiated ...

In J2SDKEE1.2.1,I can find javax.rmi.PortableRemoteObject.class,but in J2SDKEE1.3,I can not find PortableRemoteObject.class.Who can tell me where is it?In developing EJB,the client code contains:" RemoteHome home=(RemoteHome)javax.rmi.PortableRemoteObject.narrow(obj,RemoteHome.class);"Does the ...

Posted this in the JMS Forum...Probably..I should ask people in this forumAnyone knows why I can't start the j2ee ..which I hope to use it as the JMS provider. I am trying to try the e.g. from JMS tutorial....But it seems that I can't start the j2ee in the first place 'cos error say that I ...

After installing J2EE and making all PATH lines needed in the autoexec.bat, i run j2ee :C:\j2ee -verboseand get error messages :"Insufficient environmental space" (16 times)"Syntax error" (3 times)"Insufficient environmental space" (1 time)"invalid command or filename" Is there anyone who had ...

Hi!I want to use MySQL with EJB. I know that J2EE supports two phase commit.As you might know, MySQL doesn't support transactions fully.I wondering if two phase commit concept in J2EE requires transaction support from database or it can manage transactions even if a database server doesn't ...

what create this error : java.net.SocketException socket write error ( code = 10055 )Thanks

i am newbie to the j2ee and wirte a simple ejb jar file to depoly on jboss with no error message. beside, with a client hope to access test if my ejb jar could work correct, but i do not know how to run the client by typing java HelloClient (the client i worte)in commond line or spesify the ...

I am not sure this is the right forum but I think it is closest. I have some questions regarding the containers of the J2EE AppServer. 1. Is it possible to host multiple containers in AppServer in one JVM?2. Is it possible to develope my own container but follows the J2EE rules.3. What is ...

How is Command Pattern is light weight as compared to session fascade design pattern?

The application which I am developing is a typical client-server app using Java sockets with TCP/IP. I am using bufferedinputstream and a byte array of size-1024. I will be transferring multiple files one after the other. Information regarding the file is send as a header splitted by ...

Greetings:I am attempting to compile an EJB test client using the Sun tools. I am running on a Red Hat Linux environment. My classpath is as follows:CLASSPATH=/home/work/research/jdk1.3.1_01and I am attempting to do the compile using compile.sh, which contains the following ...

Hi all,In one of the beanmanaged entity bean, the ejbStore is not called after ejbCreate. I am using wblogic 6.1 server. I've also coded similar types of entity bean and those are working perfectly.I am getting the following exception message when I call the create method from the ...

I'm trying to create a tag to implement templates. I'm using the PetStore as an example. I get to this point but I do not understand the message! Is not TagSupport implementing the Tag interface? The tag InsertTag extends TagSupport and calls super() in the constuctore?Can anyone help me with ...

Can we use JDO-Java Data Objects, for maintaining objects in session.

Greetings:I am attempting to deploy a CMP bean on the J2EE reference server. Cloudscape is the database I am using.In all of the documentation and books that I have read, when you add such a bean to an application using the deploytool, in the deployment settings window you can create the ...

I have a question about the Observer patterne. I have tried to implement it im my application but without result. First my idea was to save all the client Object references in A linked List in a bean on the server. Then each time a certain event ocurs on my server I will call a method fire() ...

The overhead of reference counting has led to a preference for mark-and-sweep garbage collection. But this has some obvious disadvantages as well. For example, creation of temporary objects chews up memory; this reduces performance due to having to search for unused objects during garbage ...

Java forces software designers to choose between synchronized and unsynchronized access when writing a class. Often, the most general-purpose design requires synchronization, while a number of important uses of the class do not. Synchronized wrapper classes are inconvenient to write and ...

Is there any way, any method, to open a dir in a window and show, in this window, its content, such as I'd clicked on this directory ?I've preferred an O.S. independent way, but it's not so important.Thz

I am new in the J2EE world so I have no feeling which objects should be implemented as EJB objects and which should be notmal objects. Are there any criterions for that? Thanks in advance.

Hi, i'd like to utilize the J2EE capabilities for user management in my web application. I had a look at the Tomcat security sample which provides automatic login whenever a user tries to access a protected resource. This looks promising but the only drawback here is how the list of users is ...

I have been working in the OO world for more than 15 years and am an expert in Smalltalk. I have begun moving into Java and am not entirely thrilled by my experiences to date. I am finding out that what I would treat as simple tasks prove to be inordinately difficult or end up incomplete in ...

is there any way to open any file with its defualt associated application from a java program ?Example:In Windows I have a file example.txt and, from a java program, I would like opening it by the defualt associated application Notepad.Thx

In windows I can open a dir in an explorer window with this java code:For winnt o 2000Runtime.getRuntime().exec("cmd /C start c://db /B");For win9xRuntime.getRuntime().exec("start c://db");For opening a file in win I can use this java code:Runtime.getRuntime().exec("cmd /C start filename ...

Hi, Startup classes are very necessary one in some situations.Support for the startup classes provided by weblogic or orionserver or other appservers are different..I mean that startup classes meant for one appserver can not used in other appserver without much changes made to it.Whether there ...

Hello dear j2ee community !How can I configure the j2ee server such that when someone type http://localhost/~username he is directly redirected to the public_html directory of the username ?I know that we can do this with tomcat (adding something like that in the server.xml file: <Listener ...

After going through the book ,UML Distilled,and some other sites, i struck with some doubts. The major concerns are1. Regarding the steps or sequence of OOAD model .For the OOAD approach,I assume that the steps to be followded are i) Usecase ii) Problem domain identification iii) Sequence ...