I have a JSP page that contains a scriplet where i instantiate an object. I would like to pass that object into the JSP tag without using any cache. For example i would like to accomplish this: <%@ taglib prefix="wf" uri="JspCustomTag" %> <% Object myObject = new Object(); %> <wf:my-tag obj=myObject /> I'm trying to avoid dir...
What is a good way to render data produced by a Java process in the browser? I've made extensive use of JSP and the various associated frameworks (JSTL, Struts, Tapestry, etc), as well as more comprehensive frameworks not related to JSP (GWT, OpenLaszlo). None of the solutions have ever been entirely satisfactory - in most cases the fr...
Has anyone found a usable JSP/Servlet hosting provider? Lunarpages offers JSP as an option, but the server they use (Resin 2.1) is poorly implemented, out of date, cantankerous, and is always running out of memory. There's javaservlethosting.com, but they apparently have a rather negative reputation for poor service. Myjavaserver.com is ...
I keep running into this problem when debugging JSP pages in OpenNMS. The Jetty wiki talks about keepGenerated (http://docs.codehaus.org/display/JETTY/KeepGenerated) in webdefault.xml but it seems unclear how this works in embedded setups. ...
Can anyone recommend a framework for templating/formatting messages in a standalone application along the lines of the JSP EL (Expression Language)? I would expect to be able to instantiate a an object of some sort, give it a template along the lines of Dear ${customer.firstName}. You order will be dispatched on ${order.estimatedDispat...
Hi, I saw some code like the following in a JSP <c:if test="<%=request.isUserInRole(RoleEnum.USER.getCode())%>"> <li>user</li> </c:if> My confusion is over the "=" that appears in the value of the test attribute. My understanding was that anything included within <%= %> is printed to the output, but surely the value assigned to t...
I'm using the following code to query a database from my jsp, but I'd like to know more about what's happening behind the scenes. These are my two primary questions. Does the tag access the ResultSet directly, or is the query result being stored in a datastructure in memory? When is the connection closed? <%@ taglib prefix="sql" uri=...
I have an application that sends the customer to another site to handle the payments. The other site, outside of the customer, calls a page on our server to let us know what the status is of the payment. The called page checks the parameters that are given by the payment application and checks to see whether the transaction is known to u...
Hi, I have a java bean like this: class Person { int age; String name; } I'd like to iterate over a collection of these beans in a JSP, showing each person in a HTML table row, and in the last row of the table I'd like to show the total of all the ages. The code to generate the table rows will look something like this: <c:forEa...
Our project uses Cruise Control to both build and hot deploy a web application to a remote server (via FTP) running Tomcat in the form of a .war file. Unfortunately, "hot" deploys don't appear to work properly, causing us to reboot Tomcat in response to each deployment. We would really like to do this auto-magically, much like the buil...
I am planning to extend the basic html input tag provided by Spring to incorporate more features into it. I did similar kind of exercise in past for Struts too. At that point of time I had to create a tld file with the attributes that I introduced plus all the attributes available in the parent tag. This is bit tiresome and repetitive s...
Hi, I have a class that defines the names of various session attributes, e.g. class Constants { public static final String ATTR_CURRENT_USER = "current.user"; } I would like to use these constants within a JSP to test for the presence of these attributes, something like: <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/co...
Hi, Is it possible to throw an exception in a JSP without using scriptlet code? Cheers, Don ...
Hi, Does anyone know of a good tool for debugging JSPs from within Eclipse? I'd like to be able to set and watch breakpoints, step through the Java code/tags, etc within Eclipse while the app is running (under JBoss in my case). Presumably it's reasonably straightforward to debug the servlet class that's generated from a JSP, but it's ...
I have an Enum called Status defined as such: public enum Status { VALID("valid"), OLD("old"); private final String val; Status(String val) { this.val = val; } public String getStatus() { return val; } } I would like to access the value of VALID from a JSTL tag. Specifically the test attri...
In Java, web apps are bundled in to WARs. By default, many servlet containers will use the WAR name as the context name for the application. Thus myapp.war gets deployed to http://example.com/myapp. The problem is that the webapp considers its "root" to be, well, "root", or simply "/", whereas HTML would consider the root of your appli...
Hi, I have a class that defines the names of various constants, e.g. class Constants { public static final String ATTR_CURRENT_USER = "current.user"; } I would like to use these constants within a JSP without using Scriptlet code such as: <%@ page import="com.example.Constants" %> <%= Constants.ATTR_CURRENT_USER %> There appea...
I need to display the log entries from a database. Of course the log data is huge, so I have to show the results on several pages, and that **without** getting **all** the log data at once, but as the user navigates through the pages. I know about DisplayTag and TableTags, but it seems to me that they both fetch all the data before appl...
I deploy a webapp on two different containers (Tomcat and Jetty), but their default servlets for serving the static content have a different way of handling the URL structure I want to use (details). I am therefore looking to include a small servlet in the webapp to serve its own static content (images, CSS, etc.). The servlet should ha...
I have a bunch of JSP files and backend in Tomcat. I have 3 different versions of JSP with same logic inside but with different layouts. So if I change some logic I have three JSP file to fix. What is the proper soution for such a scenario? I thought of some XML and XSLT stack: backend gives only data in XML and than for each layout I h...