RE: HELP - "Illegal target of jump or branch"
Marc, This may be related to the size of you resulting jspservice method. If that is the case you need to break it up into multiple includes - as recommended to someone else earlier today. lar -Original Message- From: Marc Ellison [mailto:[EMAIL PROTECTED]] Sent: Tuesday, March 20, 2001 3:07 PM To: '[EMAIL PROTECTED]' Cc: Kyle Robinson Subject: HELP - "Illegal target of jump or branch" Hi, I have been getting a very interesting error folks ;-) I have constructed a jsp file that uses ALOT of struts-defined tags, and which I have running with Tomcat. Initially the page would not work so I commented out a lot of the code. The page now works to an extent, but as soon as I try to uncomment any of the other struts tags it throws this error message. javax.servlet.ServletException: (class: _0002fdemographicDetails_0002ejspdemographicDetails_jsp_73, method: _jspService signature: (Ljavax/servlet/http/HttpServletRequest;Ljavax/servlet/http/HttpServletRespo nse;)V) I have looked in the mail archive and one guy suggested changing the values of the stack/memory allocation pools to a higher value as it couldn't cope with the number of tags. However, I still get the same error. Has anybody encountered a similar problemif so please HELP!! Kind regards Marc
RE: Sample Servlet Controller
nagesh, I am not sure what you are asking for. You are able to write a vendor neutral app using the bluestone servlet engine. If you elaborate a bit I can offer some advice. You can get to a Trail Map on the gallery website for further information http://gallery.bluestone.com/scripts/SaISAPI.dll/Gallery.class/demos/trailMa ps/index.jsp thanks, Larry -Original Message- From: Nageshwar Charka [mailto:[EMAIL PROTECTED]] Sent: Tuesday, February 27, 2001 10:47 AM To: '[EMAIL PROTECTED]' Subject: Sample Servlet Controller Hi there, Can somebody help me in getting some sample code snippet for Struts Servlet Controller(Struts Application startup Servlet). Currently I am using SaServletEngine.class as the controller from Bluestone Software(HP). It just works fine, but I want to make a vender neutral app. Thanks in advance -nagesh
RE: Template tags?
The 1.0 release will be officially released very shortly. In the mean time I suggest you use the latest nightly builds as they are very nearly what the final 1.0 release will be. As far as the template tags I am not familiar enough with them to comment. But, with jsp:include you can easily add your navigation bar. -Original Message- From: John Nikolai To: [EMAIL PROTECTED] Sent: 2/20/01 7:31 PM Subject: Template tags? Hi all! I'm defiantly new to the struts and taglibs so please bear with my questions: We are writing a proof of concept to see if struts will meet our needs for a non-profit customer we are working with. Several questions have come up during this process. First off, the web pages we will be creating will have a common navigation bar used across the whole web site. It would be great if we can create one HTML file called navigation.jsp which all pages use. It seems that the struts template taglibs might be the solution, unfortunately the 0.5 version of struts we downloaded does not contain these taglibs. The template taglibs are in CVS and easily accessed but I'm wondering if these are going to be distributed in the next release of struts. Also I'm wondering if the template taglibs will suit our needs. Any other solutions to the above problem would be greatly appreciated. OK, this was only one question. I'm sure as we move along with the proof of concept more will pop up. Thanks for all your help, - John
RE: struts portability.
Backward compatibility is an ongoing priority from 1.0 out. The idea, as I have understood it, has been to make as many non-backward compatible changes as possible before the 1.0 release to help alleviate the need for them later. -Original Message-From: Peri Srinivas [mailto:[EMAIL PROTECTED]]Sent: Tuesday, February 20, 2001 1:41 PMTo: [EMAIL PROTECTED]Subject: struts portability. Hi , I just bumped on to project where I had a code base working with 0.5 version of Struts. After replacing with 1.0 i discovered there were quite a bunch of chages like. 1)ValidatingActionForm --changed from Interface to class. 2)Methods of ActionBase changed thier signatures. eg: 1)getResources 2)saveErrors. Can we assume the backWord compatiblity of 1.0 when we have future versions. T, Peri
RE: GenericDataSource Enhancement
My vote would be to hold off until 1.0 is released to add enahancements. Let's concentrate on the outstanding documentation and any critical bugs. thanks, larry -Original Message- From: Craig R. McClanahan [mailto:[EMAIL PROTECTED]] Sent: Thursday, January 04, 2001 6:46 PM To: [EMAIL PROTECTED] Subject: Re: GenericDataSource Enhancement David Winterfeldt wrote: > I don't see GenericDataSource checking to see if a > connection is dead/closed before it returns it from > the pool. I think my ISP shuts down the database at > night for backups and it kills the connection pool. > > Could checking to see if the connection is live > (reconect if dead) be added? > It certainly could, along with other stuff like implementing the getConnection(username, password) call correctly. Does it need to be fixed within the next few days (i.e. before a 1.0 release), or are these enhancements we can worry about after 1.0 is released? > > David Winterfeldt > Craig
RE: Proposal: RetroFit Struts with the Delegation Event Model
I agree - I would like to see the inclusion of events for any and all interesting events. I think the following article link may be of some interest as well: http://www.sys-con.com/java/archives/0601/grant/ It includes an interesting implementation of events for template based processing - for pre and post processing of jsp includes. I like the concepts of a Document class and ModelContext. Personally, I would like to see a View class/interface and ViewContext and Controller class/interface and Controller Context as well. Coupled with appropriate event subscriptions and notifications Struts would more closely resemble the original MVC model. It would be interesting to use this notification mechanism to allow for multiple Views to be notified of Model Change Events. This would open the door ( a little wider at least ) for other types of application development such as B2B. The controller seems the appropriate place from which to fire events. * Single ActionEvent class, or subclasses for various types of events that have different properties (some events care about the current ActionMapping and some don't). Subclasses * SIngle registrations of ActionListeners that receive all types of events, or separate registrations for separate event families? Seperate event listener registrations for event families seems the cleanest implementation and would eliminate event-storm like activity. * An ActionEvent, or the ActionListener that receives it, should have knowledge of the ActionServlet it is associated with, to provide access to underlying resources provided by the servlet. (The whole event listener model is intimately tied to Struts anyway, so this does not seem onerous). This would be a good place for the Controller class/interface and ControllerContext. Just my 2 cents. Thanks, Larry -Original Message- From: Craig R. McClanahan To: [EMAIL PROTECTED] Cc: [EMAIL PROTECTED] Sent: 12/26/00 9:57 PM Subject: Re: Proposal: RetroFit Struts with the Delegation Event Model I like the basic idea of event listeners for Struts events. About the particular proposal, though, I've got some comments and questions I would like feedback on. * As fleshed out, the only events reported with this model so far are before and after an Action's perform() method is called. The abstract talks about building listeners for all "interesting" events. If we're going to do a listeners model, I think we should extend it to basically all of the processXxx methods, not just processPerform(). * If we go with generalized events, putting the firing logic inside Action seems wrong -- general purpose support classes, or public methods inside ActionServlet, seem more appropriate. * Given that there will be many more events, we've got some representation choices: * Single ActionEvent class, or subclasses for various types of events that have different properties (some events care about the current ActionMapping and some don't). * SIngle registrations of ActionListeners that receive all types of events, or separate registrations for separate event families? * I also have a couple of nit-picky type thoughts: * Event type codes inside the ActionEvent seem redundant, given that the type is implicitly defined by which listener method you call. * An ActionEvent, or the ActionListener that receives it, should have knowledge of the ActionServlet it is associated with, to provide access to underlying resources provided by the servlet. (The whole event listener model is intimately tied to Struts anyway, so this does not seem onerous). * We need to use collection classes (with an implementation I'm currently working on) that do not require lots of synchronization locks or new object creations when processing event notifications, since they happen on every request. Thoughts? Craig David Geary wrote: > ABSTRACT > > It's often convenient, and sometimes necessary, to handle Struts events, > such as when an action has its locale set, or when the action servlet > processes an action's form. This document proposes retrofitting Struts > with the delegation event model. That model, which is used by the AWT > and > Swing, makes event handling simple, flexible, and scalable. > > CREDITS > > Delegation and Event Model for Struts? -- posted to struts-dev by > Robert Leland > > INTRODUCTION > > Currently, you can use inheritance to handle Struts events like those > described above. Typically, that means extending ActionServlet and > overriding a protected method, such as > ActionServlet.processActionPerform. > > Inheritance-based event handling is inflexible and does not scale well > because event sources and listeners are tightly coupled at compile time. > This was evident to AWT engineers, who replaced the AWT's original > inher
RE: Urgent help !!
Title: Urgent help !! Check that your web.xml file has load-on-startup set for ActionServlet as below: - <servlet> <servlet-name>actionservlet-name> <servlet-class>org.apache.struts.action.ActionServletservlet-class> - <init-param> <param-name>applicationparam-name> <param-value>trialtest.HelloWorldResourcesparam-value> </init-param> <load-on-startup>1load-on-startup> servlet> [McCay, Larry] -Original Message-From: Laufer, Michael [mailto:[EMAIL PROTECTED]]Sent: Thursday, December 21, 2000 11:30 AMTo: 'Struts'Subject: Urgent help !! Hi there, today I've set up a new webapplication with Struts. Now I'm facing the following exception when I'm trying to start the application. Error: 500 Location: /diplomMILA/index.jsp Internal Servlet Error: javax.servlet.ServletException: Missing resources attribute org.apache.struts.action.MESSAGE at org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:386) at _0002findex_0002ejspindex_jsp_2._jspService(_0002findex_0002ejspindex_jsp_2.java, Compiled Code) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:126) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at org.apache.jasper.runtime.JspServlet$JspServletWrapper.service(JspServlet.java:174) at org.apache.jasper.runtime.JspServlet.serviceJspFile(JspServlet.java:261) at org.apache.jasper.runtime.JspServlet.service(JspServlet.java, Compiled Code) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java, Compiled Code) at org.apache.tomcat.core.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:163) at org.apache.tomcat.servlets.DefaultServlet.doGet(DefaultServlet.java:187) at javax.servlet.http.HttpServlet.service(HttpServlet.java:740) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java, Compiled Code) at org.apache.tomcat.core.ContextManager.service(ContextManager.java:559) at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:160) at org.apache.tomcat.service.TcpConnectionThread.run(SimpleTcpEndpoint.java, Compiled Code) at java.lang.Thread.run(Thread.java:479) Root cause: javax.servlet.jsp.JspException: Missing resources attribute org.apache.struts.action.MESSAGE at org.apache.struts.taglib.MessageTag.doStartTag(MessageTag.java:360) at _0002findex_0002ejspindex_jsp_2._jspService(_0002findex_0002ejspindex_jsp_2.java, Compiled Code) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:126) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at org.apache.jasper.runtime.JspServlet$JspServletWrapper.service(JspServlet.java:174) at org.apache.jasper.runtime.JspServlet.serviceJspFile(JspServlet.java:261) at org.apache.jasper.runtime.JspServlet.service(JspServlet.java, Compiled Code) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java, Compiled Code) at org.apache.tomcat.core.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:163) at org.apache.tomcat.servlets.DefaultServlet.doGet(DefaultServlet.java:187) at javax.servlet.http.HttpServlet.service(HttpServlet.java:740) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java, Compiled Code) at org.apache.tomcat.core.ContextManager.service(ContextManager.java:559) at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:160) at org.apache.tomcat.service.TcpConnectionThread.run(SimpleTcpEndpoint.java, Compiled Code) at java.lang.Thread.run(Thread.java:479) I'm totally confused. something must be terribly wrong with classpath or so. but don't ask me, I'm trying to fix it now for two hours without any success. Maybe somebody out there finds the error immediately. By the way I'm using Tomcat 3.1. The strange thing is, that I've set a couple of applications with Struts before. Maybe it's really time for holiday :-)) Any help would be appreciated. Thanks in advance, Miek
RE: What about this model?
This concept is something that I have been contemplating for sometime. I have been recently working on a framework for Horizontal Application Services - these application services are to Federated and Collaborative. This framework would allow for interface based programming from the jsp pages and within the tag handlers. By providing a centrally available ServiceManager that is responsible for the lifecycle of each of its managed services, the jsp and tag handler developer can request the registered service for a particular interface. Services collaborate by having access to the properties of one another as well as being able to register as property change listeners of one another. Each service needs to be configured to be run within an appropriate scope for the application. Some services can run within application scope, some need to be at session and still others would probably be best at request ( such as your stateManager idea ). One of the services I plan to implement is a PresentationService for exactly the reasons you state - plus the ability to provide presentation related resources such as Type Table information to fill drop down boxes, Localized Content through logical content resolution and etc. This functionality can be provided by collaborating with other services such as the I18N Service for internationalization and localization and ContentDeliveryService for logical content. This service would need to be run within the request scope so that you don't end up with state from previous requests cluttering up the service or the need to garbage collect it manually. A word of caution - you need to to take care in providing any state machine functionality within a servlet ( controlling servlet or not ) due to the fact that there is only one servlet instance running per web app. So, you will have multiple requests being processed by the same servlet instance - you therefore have serious concurrency issues. It is good practice to not have any instance variables in a servlet - especially any that need to be updated at the session or request levels. Any thoughts on the application services framework? thanks, larry -Original Message- From: Dan Cancro [mailto:[EMAIL PROTECTED]] Sent: Friday, December 15, 2000 5:42 PM To: [EMAIL PROTECTED] Subject: RE: What about this model? That would work too. I made it a separate object because the concepts of flow control and data holding seemed separable enough to me that they should go in different classes. I can imagine a scenario where you want one kind of flow controller, but you would want state managed in one of a few different ways depending on the client's capacity for holding it. If I implemented this, I would make the StateManager an instance property of the ActionServlet. -Original Message- From: Ian.Swett [mailto:[EMAIL PROTECTED]] Sent: Friday, December 15, 2000 2:34 PM To: [EMAIL PROTECTED] Subject: Re: What about this model? I don't have much experience with struts either, but what about having the controlling servlet do the state management, rather than adding another component to do so. The concept of a StateManager of some sort for data storage, etc seems important. Besides that, I really like it, but I'd like to hear what others think. Ian Swett
RE: newbie question regarding performance
Scott, Scalability can be handled by the load-balancing techniques that you apply to your site. These mechanisms may be web farm configurations or application server deployment options. For example Bluestone Software's Total-e-Server (UBS) is typically deployed across multiple application hosts running multiple vm's. The Load Balance Broker (LBB) determines the optimal vm on the most appropriate application host to dispatch the request to. These types of approaches resolve high volume scalability before it actually reaches the web application itself. Having a single controlling servlet provides a single entry point to the application which becomes a convienient place to do many things that would otherwise be distributed accross your whole application - for instance form validation and repopulation of for elements in the event of input errors, authenticated a user, personalizing the application look and feel or collection of clickstream information. I hope this was helpful. Larry -Original Message- From: Sayles, Scott SAXONHQ [mailto:[EMAIL PROTECTED]] Sent: Thursday, October 26, 2000 5:29 PM To: '[EMAIL PROTECTED]' Subject: newbie question regarding performance I'm relatively new to Struts and MVC based architecture for Web applications. What are the implications to using a single controlling servlet for a high volume site? i.e. do I have to worry about performace in regards to using a single ActionServlet for all our requests? Thanks Scott
interfaces vs base classes
Greetings, I may have missed a previous discussion on this topic - if so I apologize. I am wondering if someone could explain why we have changed to base classes from interfaces for the Action and FormAction files. Typically, I provide an interface an abstract implementation and sometimes a default implementation of that. I have thought that this provided the greatest level of flexibility. A couple things strike me as odd: 1. We are now limited to extending a single base class instead of implementing the appropriate interface in a class which extends the most meaningful base 2. We have also broken any existing customer code that implements them directly - we won't want to make changes like this after 1.0 release Thanks in advance, Larry
