Skip to Main Content
Java Enterprise Best Practices
book

Java Enterprise Best Practices

by O'Reilly Java Authors
December 2002
Intermediate to advanced content levelIntermediate to advanced
288 pages
9h 46m
English
O'Reilly Media, Inc.
Content preview from Java Enterprise Best Practices

Consider Precompilation

An alternative to deploying JSP pages directly is to precompile them into the corresponding JSP page implementation classes and deploy only the class files. The main advantage is that the container invokes the class file immediately instead of going through the JSP container and checking if the source file has changed, resulting in slightly better performance. If you deliver applications to third parties, the fact that the JSP pages cannot be modified can be an advantage, but it can also be a disadvantage because the customer might want to adjust the look and feel of the application.

The class files for the JSP pages can be packaged in a JAR file and dropped in the WEB-INF/lib directory. In addition, the web.xml file must include mappings for all JSP page URLs to the corresponding class files:

<web-app>
   . . . 
  <servlet>
    <servlet-name>mypage</servlet-name>
    <servlet-class>org.apache.jsp.mypage$jsp</servlet-class>
  </servlet>
   . . . 
  <servlet-mapping>
    <servlet-name>mypage</servlet-name>
    <url-pattern>mypage.jsp</url-pattern>
  </servlet-mapping>
   . . . 
</web-app>

Most containers include a tool for precompiling the JSP pages in a web application. Tomcat 4, for instance, comes with a command-line tool called JspC, which can be used to compile all JSP pages and generate the required web.xml declarations, like this:

[tomcat@frontier tomcat]$ cd /usr/local/jakarta-tomcat-4.0.4/bin
[tomcat@frontier bin]$ jspc -d ~/jspsrc -webinc ~/jspsrc/web.inc 
               -webapp ../webapps/ora

The command ...

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Start your free trial

You might also like

Moving to Java 9: Better Design and Simpler Code

Moving to Java 9: Better Design and Simpler Code

Trisha Gee
Java EE 8 High Performance

Java EE 8 High Performance

Romain Manni-Bucau

Publisher Resources

ISBN: 0596003846Supplemental ContentErrata Page