[jboss-user] [JBossCache] - Re: Configuration problems For PojoCache under JBoss AS

[Naxo]

Hello again,

I really don?t know how to aspectize the objects I want to cache. As I said in my first post, all the examples that I have found are standalone. I want to use it in the Jboss AS, so I am having problems to understand exactly what to do. Please remember that I am newbie in Jboss and JbossCache. I have read all the documentation, and examples and I am quite lost right now, so I hope you can help me. 

According to the documentation, there are two steps needed to instrument or aspectize the POJOs via JBossAop:

1.	Prepare POJO. Via annotation or xml declaration. For annotation either JDK 1.4 or JDK 5.0.
2.	Instrumentation. Instrument the POJO either at compile-time or load-time. Compile-time => use the so-called aop pro-compiler to do bytecode manipulation. Load-time => you need either a special system class loader or in JDK 5.0 you use the javaagent option.

I want to use JDK 5.0 via annotation and also I want to use the load-time mode (I don?t want to do any pre-compilation at all). I think that this way is easy for a beginner like me in JbossCache. No xml files, no pre-compilation? just annotation

I am using JBossCache 1.4.1. GA under Jboss 4.0.5. GA (EJB3).

-- POJO declaration --

For the first step, I am using two classes from example directory (JBossCache-1.4.1.GA\examples\PojoCache\annotated50), Person.java and Address.java. So this is the POJO declaration:

  | package stpd.component.sensors.reads;
  | 
  | /**
  |  * @author Ben Wang
  |  */
  | @org.jboss.cache.aop.annotation.InstanceOfPojoCacheable
  | public class Person {
  |    protected String name;
  |    protected Address address;
  | 
  |    ...
  | 
  | package stpd.component.sensors.reads;
  | 
  | /**
  |  * @author Ben Wang
  |  */
  | @org.jboss.cache.aop.annotation.PojoCacheable
  | public class Address {
  |    protected String city;
  |    protected int zip;
  |    protected String street;
  | 
  |    ...
  | 
-- Instrumentation ?

For the second step I am using file \META-INF\jboss-aop.xml:

  | <?xml version="1.0" encoding="UTF-8"?>
  | 
  | <!--
  |   This is the meta file to declare user's POJO as "aspectized" under
  |   JBossCacheAop. User will need this file when:
  |   1. Run off-line precompier, aopc, to generate the "aspectized" class
  |   2. Run on-line with a special aop class loader.
  | -->
  | <aop>
  | 	<prepare expr="field(* @org.jboss.cache.aop.annotation.PojoCacheable->*)" />
  | 	<prepare expr="field(* $instanceof{@org.jboss.cache.aop.annotation.InstanceOfPojoCacheable}->*)" />
  | </aop>
  | 

There is an example called ?annotated50? that uses JDK50 POJO Cache annotation and that can be run in load-time mode. It uses ant to build and run the example.  This is how you run the example in Load-time mode:

  |    <target name="run.loadtime.example" depends="compile" description="run standalone server replicator.">
  |       <java classname="test.examples.StudentMaintTest" fork="yes">
  |          <jvmarg value="-Djboss.aop.path=${cache_resources}/jboss-aop.xml"/>
  |          <jvmarg value="-javaagent:${cache_lib-50}/jboss-aop-jdk50.jar"/>
  |          <classpath refid="lib.classpath"/>
  |          <classpath path="${output}/etc"/>
  |          <classpath path="${build}"/>
  |       </java>
  |    </target>
  | 
I am not using ant to build my project, and I don?t know how to use javaagent option for JDK 5.0.

Sorry and thank you agian.


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