Tomcat Compiler From JSP to classes

[Berlin Brown]

Does anybody know off hand which API tomcat uses to Compile JSP pages
to .classes. I want to implement a similar mechanism where I parse a
script file, then it outputs to java and then to .class java bytecode.
I will look through the source, but I was just curious. It is probably
the default java compiler, but of course the jakarta people probably
put some special wrappers over it?

 

[Ryan Stewart]

Does anybody know off hand which API tomcat uses to Compile JSP pages
to .classes. I want to implement a similar mechanism where I parse a
script file, then it outputs to java and then to .class java bytecode.
I will look through the source, but I was just curious. It is probably
the default java compiler, but of course the jakarta people probably
put some special wrappers over it?

Jasper translates JSPs to servlets, javac compiles it. See
http://jakarta.apache.org/tomcat/tomcat-5.5-doc/jasper-howto.html

 

[gimme_this_gimme_that]

Look in the tomcat docs for JikesJavaCompiler.html
and JavaCompiler.html.

To make tomcat use jikes, for example, you'd need a dot profile entry
of

export JIKESPATH=.:$JAVA_HOME/jre/lib/rt.jar

your web.xml would has to have an entry like :

<servlet>
<servlet-name>jsp</servlet-name>
<servlet-class>org.apache.jasper.servlet.JspServlet</servlet-class>
<init-param>
<param-name>logVerbosityLevel</param-name>
<param-value>WARNING</param-value>
</init-param>
<init-param>
<param-name>jspCompilerPlugin</param-name>

<param-value>org.apache.jasper.compiler.JikesJavaCompiler</param-value>
</init-param>
<init-param>
<param-name>classpath</param-name>
<param-value>/usr/j2sdk1_3_1_07/jre/lib/rt.jar</param-value>
</init-param>
<load-on-startup>3</load-on-startup>
</servlet>