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public class extends HttpJspBase { }
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The generated servlet has a package statement and a number of import statements From your general Java knowledge, you know classes can be referred to without their fully qualified package name if an import statement supplies the rest of the name If none of the imported packages contain a referenced class name, the compiler assumes it s in the same package as the class being compiled Therefore, the TimerTag class referred to on line 70 of the generated servlet (remember the error message ) is looked up in each of the imported packages, where it isn t found, and is then treated as if it were a class in the servlet s own package: Chap_00031_00037examples End of mystery But this leaves two questions: I Why does this work in JRun I How can you fix the problem The first question is easy to answer if you look at JRun s version of the generated servlet:
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// Generated by JRun, do not edit import import import import import import javaxservlet*; javaxservlethttp*; javaxservletjsp*; javaxservletjsptagext*; allairejrunjspJRunJSPStaticHelpers; javasql*;
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public class jrun__Chap17__examples__Timer2ejsp1a extends allairejrunjspHttpJSPServlet implements allairejrunjspJRunJspPage { }
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The JRun JSP translator doesn t generate a package statement, so the generated servlet is in the default unnamed package This is the same package the tag handler is in, so there s no conflict when the servlet uses the unadorned class name:
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TimerTag timer__4_1 = (TimerTag) JRunJSPStaticHelperscreateTagHandler (pageContext, "TimerTag");
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Now, how can you fix the error under Tomcat One way is to supply an import statement for TimerTag, so the java compiler knows not to try to associate it with any
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other package You don t have access to the generated servlet, only to the JSP source, which means you could place this statement in your JSP:
<%@ page import= TimerTag %>
While this would work, it s an unsatisfactory solution because it would have to be done in every JSP page that uses the tag Apart from the problem of remembering to do this, it isn t even clear to the maintenance programmer why this class is being imported no visible references exist to it A better solution is to assign a package name to the tag handler If the full class name is jspcrdebugTimerTag, then line 70 becomes
jspcrdebugTimerTag _jspx_th_debug_timer_0 = new jspcrdebugTimerTag();
and no ambiguity occurs A helpful way to separate compilation and run-time errors is to precompile the JSP page The JSP 11 specification requires compliant JSP containers to do this when a page is invoked with a request parameter named jsp_precompile The JSP container translates the JSP page into servlet source code and compiles the servlet, but won t cause it to service the request This needn t be done from a browser; it can be done from a batch Java application that simply creates a URL for the request (including the jsp_precompile parameter) and calling its openStream() method
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Testing in Isolation
Given that isolating the failing component is the key to debugging, making this easy to do is important Walking through the mental flowchart and identifying both what should be happening and what is actually happening should be possible When the problem area is isolated, it should be possible to test the failing component by itself, verifying each step of its operation To do this, you need to start from a known state If you ve changed several sections of code, recompiled some beans, and modified a deployment descriptor, you may well find the solution, but you may not see different results because of partial initializations and leftover classes To avoid this, you can do the following: I Delete old copies of translated JSP servlets and classes A JSP file is only translated when it s newer than its corresponding servlet and class file, but modules it depends on may change without triggering its retranslation Changes to files included with the <%@ include %> directive, for example,
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