Hi,
I'm trying to get a demo application to use Resin as embedded container.
The application can be run successfully using Resin the usual way and it
can also be run using Jetty as embedded container, so the application
should be "fine".
However, inside the application some action classes are loaded using
Class.forName and that seems to be cause issues in embedded mode. The
stack trace that is produces looks like this:
*
ADVERTENCIA: java.lang.NoClassDefFoundError:
org/leaf/util/ConnectionManagementHelper$SQLAction
java.lang.NoClassDefFoundError:
org/leaf/util/ConnectionManagementHelper$SQLAction
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at org.leaf.xml.ClassSource.getSource(ClassSource.java:134)
at org.leaf.xml.ClassSource.getXMLSource(ClassSource.java:264)
...
Caused by: java.lang.ClassNotFoundException:
org.leaf.util.ConnectionManagementHelper$SQLAction
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
... 27 more
*
You can see that the class that isn't
found(org/leaf/util/ConnectionManagementHelper) is in the same package
as the loading class(org.leaf.xml.ClassSource) and they all come
included in the same .jar file. Moreover, the error does not happen just
with that specific class, but with any class from that .jar that is
loaded through Class.forName.
The .jar file is just inside WEB-INF/lib and there is just one copy of
it in the classpath.
It looks as if the main classes for the framework (basically, a servlet)
would have been loaded through the system classloader, even if just
present in WEB-INF/lib, and that causes the problem when looking for
classes inside the same .jar file.
On a related note, the caucho maven repository seems to be lacking some
files, resin.jar 3.2.1 declares some files as dependencies that are not
there:
***
[ivy:retrieve] ::
[ivy:retrieve] :: UNRESOLVED DEPENDENCIES ::
[ivy:retrieve] ::
[ivy:retrieve] :: com.caucho#resin-ejb;3.2.1: not found
[ivy:retrieve] :: com.caucho#resin-j2ee-management;3.2.1: not found
[ivy:retrieve] :: com.caucho#resin-jca;3.2.1: not found
[ivy:retrieve] :: com.caucho#resin-jms;3.2.1: not found
[ivy:retrieve] :: com.caucho#resin-jsdk;3.2.1: not found
[ivy:retrieve] :: com.caucho#resin-jstl;3.2.1: not found
[ivy:retrieve] :: com.caucho#resin-jpa;3.2.1: not found
[ivy:retrieve] :: com.caucho#resin-jta;3.2.1: not found
[ivy:retrieve] :: com.caucho#resin-jws;3.2.1: not found
[ivy:retrieve] :: com.caucho#resin-support;3.2.1: not found
[ivy:retrieve] :: com.caucho#resin-webbeans;3.2.1: not found
[ivy:retrieve] ::
***
So, I had to grab the files from a Resin 3.2.1 installation, including
osgi-14.jar and javaee-16.jar which are not listed as dependencies but
are needed to run Resin embedded, at least with the resin.jar from a
normal installation, as it is different from the one you can get from
the Maven repository.
And a tiny detail, the default log level using Resin embedded is kind of
verbose, as it is set to spit the full date, the full classname and the
method for each log line, which makes each log line twice as big. A bit
too much for a default, IMHO.
Cheers!
D.
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