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All,
I'm trying to get a simple webapp up and running with Velocity. Here are
the steps I've taken so far:
1. Obtained the current trunk source from svn (I'm attempting to submit
a patch, which is why I'm going through svn instead of grabbing
the latest release)
2. $ cd struts2/trunk/apps/blank
3. $ mvn
4. Installed the target/struts2-blank webapp into Tomcat 5.5.26
5. Ran the webapp to make sure it was working by browsing to /index.html
which redirects me to examples/HelloWorld.action -> HelloWorld.jsp
Everything seems to be in order.
Now, I translated the .jsp file into a Velocity template (it may not be
correct, but I haven't gotten to any Velocity errors, yet):
<html>
<head>
<title>#stext('name=HelloWorld.message')</title>
</head>
<body>
<h2>#sproperty('value="message"')</h2>
<h3>Languages</h3>
<ul>
<li>
#surl('id=url' "action=HelloWorld")
#sparam('name=request_locale')en#end
#end
#sa("href=%{url}")English#end
</li>
<li>
#surl('id=url' 'action=HelloWorld')
#sparam('name=request_locale')es#end
#end
#sa("href=%{url}")Espanol#end
</li>
</ul>
</body>
</html>
I changed example.xml to use the Velocity template instead of the JSP:
<action name="HelloWorld" class="example.HelloWorld">
<result type="velocity">/example/HelloWorld.vm</result>
</action>
After restarting the webapp, I found that I was missing some libraries
(notably velocity.jar and velocity-tools.jar, but also the deps for
Velocity: commons-collections, commons-lang). At this point, I'm not
sure what else I need. I have a currently-working webapp that has been
using Velocity and velocity-tools (both v1.4) for years, and that's
where I've been copying my libraries from. Here's what I currently have:
./WEB-INF/lib/struts2-core-2.1.7-SNAPSHOT.jar
./WEB-INF/lib/commons-fileupload-1.2.1.jar
./WEB-INF/lib/freemarker-2.3.13.jar
./WEB-INF/lib/commons-io-1.3.2.jar
./WEB-INF/lib/xwork-2.1.3.jar
./WEB-INF/lib/ognl-2.6.11.jar
./WEB-INF/lib/velocity-1.4.jar *
./WEB-INF/lib/velocity-tools-1.4.jar *
./WEB-INF/lib/commons-collections-3.2.jar *
./WEB-INF/lib/commons-lang-2.2.jar *
./WEB-INF/lib/commons-logging-1.1.1.jar *
* - indicates that I installed the JAR myself.
So, here's the problem I get. When attempting to access
HelloWorld.action, I get the following exception:
java.lang.NoClassDefFoundError: org/apache/log/format/Formatter
org.apache.velocity.runtime.log.LogManager.createLogSystem(LogManager.java:162)
org.apache.velocity.runtime.RuntimeInstance.initializeLogger(RuntimeInstance.java:553)
org.apache.velocity.runtime.RuntimeInstance.init(RuntimeInstance.java:226)
org.apache.velocity.runtime.RuntimeInstance.init(RuntimeInstance.java:461)
org.apache.velocity.app.VelocityEngine.init(VelocityEngine.java:106)
Seems pretty obvious, right? Velocity needs the
org.apache.log.format.Formatter class. Well, I don't have this class
anywhere in my (working) project, so I'm wondering what's going on? The
class in question seems to be part of Apache Avalon which is defunct. Is
it possible that Struts is configuring Velocity to use a logging system
that I wasn't using before? If so, how do I change that?
I can see that this was partially logged as a bug in one of the s2
examples (http://issues.apache.org/struts/browse/WW-1538) but I can't
understand what the resolution was.
I've read http://struts.apache.org/2.0.14/docs/velocity.html but it
basically says "make sure you have all the proper dependencies". It
really /should/ say "you need velocity.jar and velocity-tools.jar plus
all /their/ dependencies". It's not obvious at all that velocity-tools
is required. Also, you don't mention any version requirements, which
would be nice (are there any such requirements?).
Any help would be appreciated.
Thanks,
- -chris
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