Severity of log messages is ordered, from highest to lowest: fatal – Consider logging to console and system log. error – Consider logging to console and system log. warn – Consider logging to console and system log. info – Consider logging to console and system log. debug – Log to system log, if enabled....
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DTD – The Document Type Definition The first method used to provide this definition was the DTD, or Document Type Definition. This defines the elements that may be included in your document, what attributes these elements have, and the ordering and nesting of the elements. XML Schemas XML Schemas provide a much more powerful...
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The most important decision you’ll make at the start of an XML project is the application programming interface (API) you’ll use. Many APIs are implemented by multiple vendors, so if the specific parser gives you trouble you can swap in an alternative, often without even recompiling your code. However, if you choose the wrong...
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Issuing HTTP GET Requests The key class here is HttpURLConnection, obtained by invoking openConnection on a URL object. Sadly, openConnection method’s signature specifies that it returns the superclass type, URLConnection, and we have to downcast the result. The following method issues a request and returns the entire response as one long string: public static...
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Web Services are the key point of Integration for different applications belonging to different Platforms, Languages, systems. It wouldn’t be wrong if you call Web-services as the “Rendezvous point of the Business”. I’ve been using HTTP and SOAP since several years new. REST is rather new. SOAP revolutionized RPC and loose coupling beyond the...
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I am seeing a lot of new web services are implemented using a REST style architecture these days rather than a SOAP one. Lets step back a second and explain what REST is. What is a REST Web Service The acronym REST stands for Representational State Transfer, this basically means that each unique URL...
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