Adding Classes at Run-time
by Jason Lee
I have an odd question. I have a situation where I'm manually opening a
JAR and adding its classes to the ClassLoader. What I'd like to be able
to do is have Weld scan these classes for any relevant annotations and
take the proper actions, just as if the JARs were in the classpath when
the application started. I've been staring at the JavaDocs (build
locally, btw, as I can't find them on the web :| ) but I don't see any
way to request that Weld inspect a given class. Is it there and I'm
missing it? Am I going to have cobble together that functionality? Am
I asking for something that can't be done (right now)? Any nudges in
the right direction would be much appreciated. :)
--
Jason Lee, SCJP
President, Oklahoma City Java Users Group
Senior Java Developer, Sun Microsystems
http://blogs.steeplesoft.com
12 years, 2 months
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@Alternative VS multiproject
by Geoffrey De Smet
One promise of @Alternative beans is to make it easier to mock out
things during testing.
In practice there are some problems to make that a reality.
For example, suppose we have this:
- foo-database-layer.jar
-- org/.../ProductionDatabaseSetup.class
--- Description: connects to the database on localhost (which is only
there on production).
-- org/.../TestDatabaseSetup.class
--- @Alternative
--- extends ProductionDatabaseSetup
--- Description: connects to an in-memory database and inserts testdata
in it.
- CustomerDAO
-- @Inject DatabaseSetup databaseSetup;
-- META-INF/beans.xml
--- Filled with other stuff
- foo-server.war
-- WEB-INF/lib/foo-database-layer.jar
-- WEB-INF/beans.xml
--- Filled with other stuff
Now, during the integrations tests of foo-server.war, we want to
replace ProductionDatabaseSetup with TestDatabaseSetup.
How?
1) Add a WEB-INF/beans-test.xml (just like logback-test.xml and logback.xml)
=> Does not work. It's ignored.
2) Change WEB-INF/beans.xml for the tests only.
Duplicate everything from the original.
Add declaration: <alternative>...TestDatabaseSetup</alternative>
=> Does not work. CustomerDAO still gets ProductionDatabaseSetup instead
of TestDatabaseSetup.
3) Change WEB-INF/lib/foo-database-layer.jar!META-INF/beans.xml for the
tests only.
Duplicate everything from the original.
Add declaration: <alternative>...TestDatabaseSetup</alternative>
=> Lots of code and tests are slow because of all the zipping and unzipping.
--
With kind regards,
Geoffrey De Smet
12 years, 7 months
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