Lothar & Joakim: thanks much for your responces.
Joakim:
>Per the JSP spec the Java support level is Java 6 (and it still is, even
today).
>Notice that Jetty 6 doesn't use Java itself to compile JSPs?
>Jetty 6 is using the Eclipse JDT compiler.
>Breaking spec to support Java 8 is handled by configuring to use Java and
JavaC itself.
Does this mean that I can continue using jetty 6, so long as I configure it
to not use JDT but instead to use my JDK 8's javac?
I would love for that to be true, as it should be the quickest way for me
to resolve the conflict between jetty 6 and JDK 8.
Assuming that, how do you so configure jetty 6 to use javac? A web search
came up empty. The codehaus website is defunct, and does not seem to be
archived anywhere.
I tried some guesses. The most important being:
1) as per your github page, I added a call to
System.setProperty("org.apache.jasper.compiler.disablejsr199", "false");
before I create a Server instance, but that fails--I still see
2015-08-26T18:21:12.783-0400 WARN [842741472@qtp-1002021887-0] -
Compilation error
org.eclipse.jdt.internal.compiler.classfmt.ClassFormatException: null
at
org.eclipse.jdt.internal.compiler.classfmt.ClassFileReader.<init>(ClassFileReader.java:298)
~[core-3.1.1.jar:na]
at
org.apache.jasper.compiler.JDTJavaCompiler$1.findType(JDTJavaCompiler.java:351)
[jsp-2.1.jar:6.1.11]
...
I guess that property must be for newer jetty (e.g. jetty 7+)?
2) I tried removing the core-3.1.1.jar file from my lib directory, as that
jar contains the JDT classes, but that caused a different error:
2015-08-26T18:42:46.485-0400 ERROR [1712943792@qtp-1202683709-0] -
/errors.jsp
java.lang.NoClassDefFoundError: org/apache/tools/ant/BuildListener
at
org.apache.jasper.compiler.Compiler.initJavaCompiler(Compiler.java:716)
~[jsp-2.1.jar:6.1.11]
at org.apache.jasper.compiler.Compiler.<init>(Compiler.java:116)
~[jsp-2.1.jar:6.1.11]
...
>You really should use some sort of build system.
The decision is not 100% mine to make, and involves as many political
factors as technical.
I can use whatever I want when playing around on my own workstation (e.g.
to determine dependent jars), but forcing other users our or prd servers to
use, say maven, may be impossible.
>>Doing a more focused web search found:
>> --this link, which reports what looks like the same problem (but has
no solution):
>>
http://jspl598.blogspot.com/2015/03/while-accessing-jsps-in-jetty_13.html
>This looks like your blog.
No it is not!
>Its identical to what you are describing.
>Why they didn't use this forum, or stackoverflow, i cannot comprehend.
Agreed.
I think that our use of jetty 6 is very similar to what is described here:
https://stackoverflow.com/questions/15282678/how-does-jetty-compile-jsps
Perhaps it will help if I post the code we use to embed jetty.
Our application has a Main class that is its entry point. The sole jetty
code is entirely in these 3 methods of Main:
private static void startWebServer() throws Exception {
Server server = new Server();
server.setConnectors(makeJettyConnectors());
server.setHandler(makeJettyHandler());
server.start();
}
private static Connector[] makeJettyConnectors() {
Connector connector = new SelectChannelConnector();
connector.setPort(Integer.parseInt(PropMgr.getProperty("http.port")));
return new Connector[] {connector};
}
private static Handler makeJettyHandler() {
WebAppContext context = new WebAppContext();
context.setContextPath("/");
context.setResourceBase(urlOfWebDir());
context.setDefaultsDescriptor(urlOfFile("/webdefault.xml")); //
the / prefix means to start the search at the class path root
return context;
}
Main's static initializer calls startWebServer.
In addition to that code in Main, there is also:
1) a web directory, containing the .jsp files and a bunch of other stuff
2) a .../config/webdefault.xml file
3) these jars, which I think are all jars we use for jetty/JSP:
core-3.1.1.jar
direct-client.jar
jetty-6.1.12.jar
jetty-util-6.1.12.jar
jsp-2.1.jar
jsp-api-2.1.jar
servlet-api-2.5-6.1.11.jar
I mentioned above that I tried using
System.setProperty("org.apache.jasper.compiler.disablejsr199", "false");
to disable JDT; I put that call as the first line in startWebServer.
I also tried adding this line
context.setClassLoader(getUrlClassLoader());
as the 2nd line of makeJettyHandler, since your github page also mentions
it; that too made no difference (probably for the same reason).
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