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I have to debug some legacy code. There are lot of servlets, jsp, compiled jsp, jspf, JavaScript etc. The hardest part is that JSP pages are precompiled and deployed in JBoss so all I can do is to remotely debug compiled not source pages. I have a source, but of course eclipse debugger is stepping through this_and_that_jsp.java. <br />
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The problem is that there is lot of HTML and even worse JavaScript code generated in those JSP pages. The only way to find where it breaks is to observe response (HttpServletResponse) CharArrayWriter step by step as it generates HTML page. <br />
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The problem is that it writes (of course) every 8192 characters. So, I can see the page (HTML with JavaScript) just before error and after it, but I can't catch exact moment. What would be solution to this? Should I decrease buffer size to 1 or so? I can't put 'flush' because I don't not where it breaks, I have to step through code line by line (or at least block by block). Where should I change buffer size for HttpServletResponse?<br />
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<a href="https://filedb.experts-exchange.com/incoming/2015/06_w27/920956/Screen-Shot-06-29-15-at-10.54-AM.PNG" target="_blank" title="eclipse debugger (243 KB)"><img alt="eclipse debugger" class="file-block lazyload" style="max-width: 800px;" data-src="https://filedb.experts-exchange.com/incoming/2015/06_w27/800_920956/Screen-Shot-06-29-15-at-10.54-AM.PNG" /></a>
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Screen-Shot-06-29-15-at-10.54-AM.PNG

I have to debug some legacy code. There are lot of servlets, jsp, compiled jsp, jspf, JavaScript etc. The hardest part is that JSP pages are precompiled and deployed in JBoss so all I can do is to remotely debug compiled not source pages. I have a source, but of course eclipse debugger is stepping through this_and_that_jsp.java. 

The problem is that there is lot of HTML and even worse JavaScript code generated in those JSP pages. The only way to find where it breaks is to observe response (HttpServletResponse) CharArrayWriter step by step as it generates HTML page. 

The problem is that it writes (of course) every 8192 characters. So, I can see the page (HTML with JavaScript) just before error and after it, but I can't catch exact moment. What would be solution to this? Should I decrease buffer size to 1 or so? I can't put 'flush' because I don't not where it breaks, I have to step through code line by line (or at least block by block). Where should I change buffer size for HttpServletResponse?



change size of out.write buffer

JavaServer Pages (JSP) allow the development of dynamically generated web pages. It uses the Java programming language; JSP pages are translated into servlets at runtime, with each servlet being cached and reused until the JSP is modified. JSP allows Java code to be interleaved with static web markup content, so the resulting page can be compiled and executed on the server to deliver the content.

JavaScript is a dynamic, object-based language commonly used for client-side scripting in web browsers. Recently, server side JavaScript frameworks have also emerged. JavaScript runs on nearly every operating system and  in almost every mainstream web browser.

JavaScript

Java is a platform-independent, object-oriented programming language and run-time environment, designed to have as few implementation dependencies as possible such that developers can write one set of code across all platforms using libraries. Most devices will not run Java natively, and require a run-time component to be installed in order to execute a Java program.