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Servlet Interview Questions and Answers, job interview questions, interview questions, Servlet interview faqs!
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December 1, 2008-LEJB 3.1: EJB New and Improved!
The EJB 3.0 specification was a huge improvement from what you were used to in the early versions of EJB. Available as an early draft, EJB 3.1 has many more features and is even easier to use.
December 1, 2008-Should Java Assert that Network I/O Can't Occur on the UI Thread?
Doing network I/O on the user interface (UI) thread is bad. Most developers know that and can tell you why; unfortunately, it's still done.
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Java Servlet Interview Questions
What is Response Headers?
A response from a Web server normally consists of a status line, one or more response headers, a blank line, and the document. Setting the HTTP response headers often goes hand in hand with setting the status codes in the status line. For example, several of the "document moved" status codes have an accompanying Location header, and a 401 (Unauthorized) code must include an accompanying WWW-Authenticate header.
What are the Common Response Headers?
Content-Encoding - What method was used to encode the document? You need to decode it to get the type specified by the Content-Type header. Using gzip to compress the document can dramatically reduce download times for HTML files, but it is only supported by Netscape on Unix and IE 4 and 5 on Windows.
Content-Length - How many bytes are being sent? This information is only needed if the browser is using a persistent (keep-alive) HTTP connection. If you want your servlet to take advantage of this when the browser supports it, your servlet should write the document into a ByteArrayOutputStream, look up its size when done, put that into the Content-Length field, then send the content via byteArrayStream.writeTo(response.getOutputStream()).
Content-Type - Default for servlets is text/plain, but they usually explicitly specify text/html. Setting this header is so common that there is a special method in HttpServletResponse for it: setContentType.
