RE: [wtp-dev] Server Adapter Use Case Question

["Rob Frost" <rfrost@xxxxxxx>]

Hi Rob,

I have not tried out your attached example but can explain why that
warning is generated:

-the classpath entry publish/export support that was added in WTP 2.0
now allows you to tag (using a WTP-specific classpath attribute) entries
on the project classpath for publish/export (see
https://bugs.eclipse.org/bugs/show_bug.cgi?id=185176 for a detailed
description)

-the warning you see is generated for all classpath entries that are
both missing that tag (and therefore won't be included in the
published/exported structure of the module) AND do not match a set of
classpath containers declared via an extention as entries that should be
ignored; here is the default filtered list (defined in
org.eclipse.jst.j2ee):

 <extension point="org.eclipse.jst.j2ee.classpathdep">
  	<filteredClasspathContainer
containerID="org.eclipse.jst.j2ee.internal.module.container"/>
  	<filteredClasspathContainer
containerID="org.eclipse.jst.j2ee.internal.web.container"/>
  	<filteredClasspathContainer
containerID="org.eclipse.jst.server.core.container"/>
  	<filteredClasspathContainer
containerID="org.eclipse.jdt.launching.JRE_CONTAINER"/>
 </extension> 

-I'm not completely clear on the mechanism by which your custom server
adapter is exposing the code exposed by these classpath containers at
runtime but it looks like this is only working for one of the classpath
containers (are these classes already available on the server runtime
classpath or do they needed to be added to the assembled WAR?). If your
server adapter is going to handle packaging these classes or they are
available at runtime and you want to suppress that warning, you can
utilize the "filteredClasspathContainer" element of the
"org.eclipse.jst.j233.classpathdep" extension point, otherwise, you
could leverage the classpath entry publish/export support (see  to get
the JAR(s) resolved that those cp containers packaged inside the
WEB-INF/lib of the published WAR.

-Rob

-----Original Message-----
From: wtp-dev-bounces@xxxxxxxxxxx [mailto:wtp-dev-bounces@xxxxxxxxxxx]
On Behalf Of Rob Stryker
Sent: Thursday, August 23, 2007 10:10 AM
To: General discussion of project-wide or architectural issues.
Subject: [wtp-dev] Server Adapter Use Case Question


Hi All:

I've been having a bit of trouble with a simple use-case, and I wanted 
to know if this was a valid use case or if it's not actually a use-case.

My issue is that the following works 100% for generic adapters, but not 
for the example adapter I'm including.

When you create a dynamic web project, depending on the runtime used, 
different jars may be added to the project's classpath. My use case is 
very simple. Create a dynamic web project with some server adapter (in 
this case, the attached stripped-down server adapter), and then add only

1 class file inside that new project, a JUnit test file, which attempts 
to merely access classes contributed by the facets. The goal is to see 
if the junit test case will be able to access these classes at runtime.

I am confronted with ClassNotFoundExceptions upon doing this. Also, in 
the problems view, is the following message:

Classpath entry example.app.server.classpath.genericInitializer/Example 
Server Runtime/jst.java/5.0 will not be exported or published. Runtime 
ClassNotFoundExceptions may result. 


Step by step reproduction:
1) untar the attached project
2) Open a blank workspace. Import the attached project into the
workspace.
3) Run the attached project as an eclipse plugin.
4) Create a new server of type Example (RS) -> Example Server Type
5) Create a dynamic web project targeting the Example Server Runtime
6) Note the classpath containers added to the project
7) Note the warnings in the Problems View
8) Create a JUnit Test *inside* this dynamic web project with the 
following method:
    public void testShouldNotFail() {
        Start1.class.getName();
        Start.class.getName();
    }
9a) Before running, verify that the classpath container "Example entries

for jst.java" includes a jar "jst.java.jar" which has one class in it, 
Start1.class

9b) Before running, verify that the classpath container "Example entries

for jst.web" includes a jar "jst.web.jar" which has one class in it, 
Start.class

10) right-click on the junit test file, and run it as a junit test.

Result:
   The first line will not fail. Start1.getClass().getName() will 
resolve successfully.
   The second line *will* fail.  Start.getClass().getName() will not 
resolve successfully.

This seems very odd, because both were added to the classpath in the 
same fashion as far as I can tell by looking at my stripped down server 
adapter example. (in 
example.app.server.core.classpath.ProjectRuntimeClasspathProvider in the

method getClasspathEntries(IProjectFacetVersion)  Also, both classpath 
containers receive the warning in the problems view, so it seems odd 
that one of the classes would resolve and the other would not.

I realize this is most likely an error in the enclosed adapter, but I'm 
completely unsure what one would need to do to make this junit test work

properly, to ensure that these jars are exported to the junit's launch.

- Rob Stryker

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