Loading jsps with jetty that are precompiled still requires jdk?

Question

I'm trying to use jetty with a JRE and not a JDK. I figured if I precompile the jsps, and put the resulting classfiles on the classpath, there should be no need for jetty to try and compile the jsp when the browser requests it, yet I get

org.apache.jasper.JasperException: PWC6345: There is an error in invoking javac. 
A full JDK (not just JRE) is required

no matter what I do when I request the jsp from the browser.

I have these init params in my webdefault.xml and the built class files are definitely on the classpath

   <init-param>
        <param-name>reloading</param-name>
        <param-value>false</param-value>
   </init-param>
   <init-param>
        <param-name>development</param-name>
        <param-value>false</param-value>
   </init-param>
   <init-param>
        <param-name>classpath</param-name>
        <param-value>c:/project/build/classes</param-value>
   </init-param>

How do I get jetty to not try and compile the jsp again so I can run it with a jre and not a jdk?

Answer 1

After wrestling with precompiling JSPs for Jetty running on a JRE I found that precompilation isn't necessary. Jetty (7.5.5 and later) ships with a compiler that can be used to compile JSPs when Jetty is run using a JRE. The details can be found on this page:

https://wiki.eclipse.org/Jetty/Howto/Configure_JSP#Compiling_JSPs

In short, either add the following snippet to jetty.xml:

<Call class="java.lang.System"  name="setProperty">
  <Arg>org.apache.jasper.compiler.disablejsr199</Arg>
  <Arg>true</Arg>
</Call>

or this line into start.ini:

-Dorg.apache.jasper.compiler.disablejsr199=true