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I shall be home soon. She shook her head. But an important thing to remember here is that when the JSP engine generates the Java code for a JSP page, it also inserts the contents of the included pages into the servlet that it generates.
The set of pages that is translated into a single servlet class is called a translation unit. Some of the JSP tags affect the whole translation unit and not just the page in which they are declared.
Keep in mind these other points regarding a translation unit: The page directives explained in section A variable declaration cannot occur more than once in a single translation unit. For example, we cannot declare a variable in an included page using the include directive if it is already declared in the including page since the two pages constitute a single translation unit. We examine the jsp:usebean action further in chapter JSP life-cycle phases You might have observed that when a JSP page is accessed for the first time, the server is slower in responding than it is in the second, third, and subsequent accesses.
This is because, as we mentioned previously, every JSP page must be converted into an instance of a servlet class before it can be used to service client requests. For each request, the JSP engine checks the timestamps of the source JSP page and the corresponding servlet class file to determine if the JSP page is new or if it has already been converted into a class file.
This process consists of seven phases, and you need to understand their order and significance for the exam.
The Java file is compiled. The compiled class is loaded. An instance of the servlet is created. This method is called before any other method to allow initialization. This method is called for each request. This method is called when the servlet container decides to take the servlet out of service. The same JavaBean name is not used more than once in a translation unit. If we are using a custom tag library, the library is valid. The usage of custom tags is valid. Once the validations are completed, the engine creates a Java file containing a public servlet class.
Compilation In the compilation phase, the Java file generated in the previous step is compiled using the normal Java compiler javac or using a vendor-provided compiler or even a userspecified compiler 2.
All the Java code that we write in declarations, scriptlets, and expressions is validated during this phase. For example, if we want to compile the counter. This can be quite useful during the development phase if we have complex JSP pages that create database connections or access other J2EE 2 This varies from container to container.
Please consult the servlet container documentation for more information. Also, it is always a good idea to precompile all the pages.
In this way, we check for syntax errors and keep the pages ready to be served, thus reducing the response time for the first request to each page. If the value is false, the precompilation will not occur.
The parameter can also be specified without any value, in which case the default is true: In either case, true or false, the page will not be executed. Also, this would be a good place to point out that all of the request parameter names that include the prefix jsp are reserved and must not be used for user-defined values. Thus, the following usage is not recommended and may result in unexpected behavior: Loading and instantiation After successful compilation, the container loads the servlet class into memory and instantiates it.
The HttpJspPage interface extends the JspPage interface of the same package, which in turn extends the Servlet interface of the javax. The generated servlet class thus implements all the methods of these three interfaces and is also known as the page s implementation class.
The JspPage interface declares only two methods jspinit and jsp- Destroy that must be implemented by all JSP pages regardless of the clientserver protocol. This base class provides the default implementations of all the methods of the Servlet interface and the default implementations of both methods of the JspPage interface: jspinit and jspdestroy.
It is called before any other method, and is called only once for a servlet instance. We discuss the details of this method in chapter This is the last method that is called on the servlet instance, and it is used to clean up the resources acquired in the jspinit method.
We are not required to implement the jspinit and jspdestroy methods, since they have already been implemented by the base class. Use jspdestroy to save the final value to the file when the server shuts down.
The file acts like a database. When the page is first loaded into the servlet container, the engine will call the jspinit method. Finally, when the page is about to be destroyed, the container will call the jspdestroy method. In this method, we open the resource database file again, and save the latest value of the variable count into it.
Because the JSP page is converted into a servlet, we can call all the methods in a JSP page that we can call on a servlet. Hence we can get the ServletContext object via getservletconfig. Also, the base class of the page s generated class extends javax.
In Tomcat and many other containers, the base class of the page s generated class also implements the ServletConfig interface.
Thus, in both methods, jspinit and jspdestroy , we get the Servlet- Context object by using the method getservletcontext , which is actually defined in the javax. The returned Servlet- Context object can then be used in a JSP page exactly the way we use it in normal servlets.
In our example, we are using the ServletContext object to convert the relative path of a resource into its real path. When the server is started the very first time and the page is first accessed, the file counter. We can catch the exception and log the error message with this method. When the server is started the second time and the JSP page is loaded, the jspinit method will find the file and initialize the count variable to its previously saved value. This directive applies to the entire translation unit and not just to the page in which it is declared.
A Boolean literal specifying whether the current JSP page is capable of handling errors. Any scripting language supported by the JSP engine. Any valid Java class that implements javax. Specifies the size of the output buffer. If a buffer size is specified, it must be in kilobytes kb. If buffering is not required, specify the string none. A Boolean literal indicating whether the buffer should be flushed when it is full.
For example, if we want to use the Date class of the package java. At the time of translation, the JSP engine inserts an import statement into the generated servlet for each of the packages declared using this attribute.
A JSP engine always imports the java. NOTE import is the only attribute of the page directive that can occur multiple times in a translation unit. The default value is true, in which case the JSP engine declares the implicit variable session. We will learn more about implicit variables in chapter Just as in normal Java programs, we can handle the exceptions in JSP pages using try-catch blocks.
However, the JSP specification defines a better approach, which separates the error-handling code from the main page and thus promotes reusability of the exception-handling mechanism. In listing Instead, with the help of the errorpage attribute, it instructs the JSP engine to delegate the error handling to errorhandler.
The iserrorpage attribute conveys whether the current page can act as an error handler for any other JSP page. The default value of the iserrorpage attribute is false.
For example, the errorhandler. Because it does not implement any business logic, it can be reused for different JSP pages. It is not necessary that the errorpage value be a JSP page.
This prevents unanticipated error messages from being displayed on the client s browser The language and extends attributes The language attribute specifies the language used by a page in declarations, scriptlets, and expressions. The default value is java, which is also the only value allowed by the JSP Specification 2.
This is useful only if we want to customize the behavior of the generated servlet class. The default base class is vendor specific and is designed to work efficiently with the rest of the framework. Consequently, this attribute is seldom used. The default size of the buffer is JSP engine implementation dependent, but the specification mandates it to be at least 8kb.