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Looking at the message carefully, you can find several clues about the nature of the error First, it reports the location of the JSP page This tells you Tomcat was able to find the JSP source code Next, the message text says Jasper (the Tomcat JSP translator) was unable to compile a JSP servlet class and gives the name of the generated java source file This means translation from jsp to java completed and the java compiler was invoked, but failed So you know this isn t a run-time error This isn t due to a problem with the JDBC-ODBC driver, so it must be a compilation error with the generated servlet source code Having isolated the failing component, you can understand the rest of the error message The generated servlet on line 70 creates an instance of TimerTag() and stores it in the _jspx_th_debug_timer_0 variable This is the line that gets the error message Class Chap_00031_00037examplesTimerTag not found So the java compiler (not the JSP translator or the servlet engine) was unable to find a class If you can figure out why, you re done The compiler might not find a class for several reasons The class may not have been compiled or its class file may not exist in the classpath But a careful examination of the error message points to a different reason Notice exactly which class the compiler is looking for: Chap_00031_00037examplesTimerTag Where did that package name come from Looking back at the tag handler source code, you can see no package statement and, in the TLD, the fully qualified class name is simply TimerTag This accounts for why the class isn t found the compiler isn t looking for it under the correct name But why is the compiler looking for a class with that package name Because this is a compile issue, you need to look at the java file to determine the source of the problem The location of this file is servlet engine-dependent, but you can tell from the error message it s under the work subdirectory of the Tomcat root Working your way down through the Web application subdirectories, you find the servlet source file The first few lines show what the problem is.

package Chap_00031_00037examples; import import import import import javaxservlet*; javaxservlethttp*; javaxservletjsp*; orgapachejasperJasperException; javasql*;

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:

// Generated by JRun, do not edit import import import import import import javaxservlet*; javaxservlethttp*; javaxservletjsp*; javaxservletjsptagext*; allairejrunjspJRunJSPStaticHelpers; javasql*;

public class jrun__Chap17__examples__Timer2ejsp1a extends allairejrunjspHttpJSPServlet implements allairejrunjspJRunJspPage { }

Figure 12-1

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:

TimerTag timer__4_1 = (TimerTag) JRunJSPStaticHelperscreateTagHandler (pageContext, "TimerTag");

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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