What is JSP compile?
What is JSP compile?
JSP Compilation When a browser asks for a JSP, the JSP engine first checks to see whether it needs to compile the page. If the page has never been compiled, or if the JSP has been modified since it was last compiled, the JSP engine compiles the page. Turning the JSP into a servlet. Compiling the servlet.
Do JSP files need to be compiled?
As long as it is JSP, you dont need to compile/convert. The application server automatically translates your JSP into corresponding servlet, a Java file (on the first hit to the JSP), and then compiles it to class file. JSPs and will compile them to Servlet classes and reload if needed.
Where are compiled JSP?
/work folder
The compiled JSP files are by default available in the /work folder of the Tomcat environment. There should be a subfolder Catalina which in turn has a subfolder representing the domain name which defaults to localhost . There in turn should be the project folder which in turn contains package hierarchy org.
How is a JSP page invoked and compiled?
Pages built using JSP technology are typically implemented using a translation phase that is performed once, the first time the page is called. The page is compiled into a Java Servlet class and remains in server memory, so subsequent calls to the page have very fast response times.
How are JSP files compiled?
Web Server provides the following ways of compiling JSP 2.1-compliant source files into servlets: JSP are automatically compiled at runtime. The jspc command-line tool, described in this section, enables you to precompile JSPs at the command line….Compiling JSPs Using the Command-Line Compiler.
| File Specifier | Description |
|---|---|
| files | One or more JSP files to be compiled. |
Is JSP compiled or interpreted?
JavaScript is an interpreted language, not a compiled language. A program such as C++ or Java needs to be compiled before it is run. In contrast, JavaScript has no compilation step. Instead, an interpreter in the browser reads over the JavaScript code, interprets each line, and runs it.
Where JSP files are stored?
The JSP translated files are stored (in Tomcat) in /work/Catalina/localhost/[your_app_context]/org/apache/jsp/ . Should check in other containers or web servers.
How does Tomcat compile JSP?
The first time a JSP page is requested, Tomcat passes it to Jasper which parses the code and sends it to its Java compiler (JDT, a component borrowed from the Eclipse IDE project) to have the servlet elements compiled into Java bytecode classes.
When JSP page is compiled what is turned into?
So, JSP page is translated into servlet by the help of JSP translator. The JSP translator is a part of web server which is responsible for this translation into servlet. After that, Servlet page is compiled by the compiler and gets converted into the . class file.
What are the events in JSP page?
Life cycle of JSP
- Translation of JSP page to Servlet.
- Compilation of JSP page(Compilation of JSP into test.
- Classloading (test.
- Instantiation(Object of the generated Servlet is created)
- Initialization(jspInit() method is invoked by the container)
- Request processing(_jspService()is invoked by the container)
When a JSP page is called it will be compiled by the JSP engine internally into a Java servlet?
When a JSP page is called, it will be compiled (by the JSP engine) into a Java servlet. At this point the servlet is handled by the servlet engine, just like any other servlet.
Is Pascal interpreted or compiled?
Languages like Assembly Language, C, C++, Fortran, Pascal were almost always compiled into machine code. Languages like Basic, VbScript and JavaScript were usually interpreted.
Where is the JSP class file located?
This .class file usually is located somewhere in the servlet container’s work directory for the application. Once the JSP servlet has compiled the servlet class from the JSP source code, it just forwards the request to this servlet class.
What is a JSP servlet?
If the JSP is not compiled yet, the JSP servlet translates the JSP to some Java source code implementing the Servlet interface. Then it compiles this Java source code to a.class file. This.class file usually is located somewhere in the servlet container’s work directory for the application.
Why can’t I run a JSP file from an application?
As you say JSP files run on the server , so they need a server to run . They can’t be run individually from the application since they might have a application flow (i.e. dependencies with previous files). You might try using the browser tools like Firebug to make UI changes in your pages,
What is the source code of a JSP application?
JSP source code – This is the form the developer actually writes. It exists in a text file with an extension of .jsp, and consists of a mix of HTML template code, Java language statements, and JSP directives and actions that describe how to generate a Web page to service a particular request.
