What is the meaning of ? (question mark) in a URL string?
Its name is query string. After the question mark you can pass key-value pairs and use them server-side.
jsp
How to specify the default error page in web.xml?
On Servlet 3.0 or newer you could just specify But as you’re still on Servlet 2.5, there’s no other way than specifying every common HTTP error individually. You need to figure which HTTP errors the enduser could possibly face. On a barebones webapp with for example the usage of HTTP authentication, having a disabled directory … Read more
How can I view .JSP files
Install Apache on your PC. Put the JSP file in the /htdocs/JSP folder in the Apache installation. You will have to create the JSP folder. Name the JSP file index.jsp. Open Apache and start the web service (the top one. Click Start) To view it, go to your browser and type in the following URL: … Read more
getOutputStream() has already been called for this response
Ok, you should be using a servlet not a JSP but if you really need to… add this directive at the top of your page: Or in the jsp-config section your web.xml Also flush/close the OutputStream and return when done.
Download a file by jQuery.Ajax
2019 modern browsers update This is the approach I’d now recommend with a few caveats: A relatively modern browser is required If the file is expected to be very large you should likely do something similar to the original approach (iframe and cookie) because some of the below operations could likely consume system memory at least as … Read more
org.apache.jasper.JasperException
when i open first time website its show error like this but if i refresh then site will open perfectly but if u leave idle sometime then if u open next then also same error after that if u refresh then site open perfect this is the problem, its applying in entire application in any … Read more
How to loop over something a specified number of times in JSTL?
The <c:forEach> tag is definitely suitable for this. It has begin and end attributes where you can specify the, well, begin and end. It has a varStatus attribute which puts a LoopTagStatus object in the loop tag scope which in turn has several methods like getIndex() and on. Here’s a kickoff example:
Static Final Long serialVersionUID = 1L
The serialVersionUID is a universal version identifier for a Serializable class. Deserialization uses this number to ensure that a loaded class corresponds exactly to a serialized object. If no match is found, then an InvalidClassException is thrown.
What is the difference between JSF, Servlet and JSP?
JSP (JavaServer Pages) JSP is a Java view technology running on the server machine which allows you to write template text in client side languages (like HTML, CSS, JavaScript, ect.). JSP supports taglibs, which are backed by pieces of Java code that let you control the page flow or output dynamically. A well-known taglib is JSTL. JSP also supports Expression … Read more
Response has aready been committed
Firstly, the problem is not in the JSP or JS in your example1. The problem is in what your servlet does when it gets the “…/abcHandler.do?operation=view;” request. The problem is that you are trying to do stuff that would require a change to the HTTP response headers … after the headers have been sent. That … Read more