the order of loading class (urgency! urgency! urgency! )

[zhengxi]

I have two ears and two wars. i want to deploy then into one server and share the jars amongst the ears and wars.
so i and this part to the jboss-app.xml and jboss-web.xml.
<loader-repository>
test.classloader:loader=test1.ear
<loader-repository-config>java2ParentDelegation=false</loader-repository-config>
</loader-repository>

now i can share the jars amongst the ears and wars.
my question is about the jar overwriting.
if there are A.jar(includes a.class) in all war's WEB-INF/lib, and a.class in different A.jar are different version.
when I call a.class in jsp file, which one will be used?

who can tell me its rule?

thank you very much.

[peterj]

When a JSP in a particular WAR uses the "a" class, it will get it from the A.jar that is in the same WAR.

In general, code within a WAR will use classes within that WAR (of course, if the class is not there it will look outside the WAR)), and code outside a WAR cannot use classes within the WAR.

[zhengxi]

I did some testing about this.

ear1.ear
|-war1.war
|-WEB-INF\A.jar(includes a.class)
|-test.jsp
war2.war
|-WEB-INF\A.jar(includes a.class)

ear1.ear, war1.war, war2.war use the same repository to share jars.

when test.jsp call a.class, jsp will use a.class in the war2.war, not the war1.war.

I don't know why, can i cannot understand it.
thanks.

[zhengxi]

ear1.ear
|-war1.war
|-WEB-INF\A.jar(includes a.class)
|-test.jsp


war2.war
|-WEB-INF\A.jar(includes a.class)


ear1.ear and war2.war are different file.

[peterj]

Which version of JBossAS are you using? In my testing, test.jsp uses a.class from A.jar in war1.war

[zhengxi]

JBoss4.2.3

did you add this part to jboss-web.xml file?
<loader-repository>
test.classloader:loader=ear1.ear
<loader-repository-config>java2ParentDelegation=false</loader-repository-config>
</loader-repository>


And I found that test.jsp will use the A.jar that is in the application that is deployed firstly.
in this case, war2 will be deployed before ear1.ear, so it use a.class in war2.war.
if I modify the file org.jboss.deployment.MainDeployer-xmbean.xml in D:\jboss-4.2.3\server\default\conf\xmdesc,

==>
we let jboss deploy ear file firstly, then test.jsp will use a.class that is in the ear1.ear\war1.war\WEB-INF\A.jar

[zhengxi]

org.jboss.deployment.MainDeployer-xmbean.xml

value="250:.rar,300:-ds.xml,400:.jar,500:.war,550:.jse,650:.ear,800:.bsh"
==>
value="250:.rar,300:-ds.xml,400:.jar,450:.ear,500:.war,550:.jse,800:.bsh"