Generics And Aries Blueprint

[Gareth Collins]

Hello,

Is injection using java 5 generics allowed?

My scenario - I am creating two generic classes:

public class MyClass1<V extends MyBaseClass> implements Runnable {
    public MyClass1(long myArgument) {
    }
}

-----
public class MyClass2<E extends MyBaseClass> implements MyInterface<E> {
// just using default constructor
}

which I want to insert into another class:

public class MyClass3 {
        public MyClass3(MyClass1<MyImplementationClass> myClass1,
MyInterface<MyImplementationClass> myInterface) {
}
}

In my blueprint file I have:

        <bean id="myClass1" class="com.mycompany.MyClass1"
init-method="start" destroy-method="stop">
                <argument value="5000" />
        </bean>
        
        <bean id="myClass2" class="com.mycompany.MyClass2" />
        
        <bean id="myClass3" class="com.mycompany.MyClass3" >
                <argument ref="myClass1"/>
                <argument ref="myClass2"/>
        </bean>

If I run this as is, blueprint will throw the following exception:

org.osgi.service.blueprint.container.ComponentDefinitionException:
Unable to find a matching constructor on class com.myCompany.myClass3
for arguments [com.mycompany.MyClass1@787f7957,
com.mycompany.MyClass2@66525531] when instanciating bean myClass3
        at 
org.apache.aries.blueprint.container.BeanRecipe.getInstance(BeanRecipe.java:272)[31:org.apache.aries.blueprint:0.3.1]
        at 
org.apache.aries.blueprint.container.BeanRecipe.internalCreate(BeanRecipe.java:706)[31:org.apache.aries.blueprint:0.3.1]
        at 
org.apache.aries.blueprint.di.AbstractRecipe.create(AbstractRecipe.java:64)[31:org.apache.aries.blueprint:0.3.1]
        at 
org.apache.aries.blueprint.container.BlueprintRepository.createInstances(BlueprintRepository.java:219)[31:org.apache.aries.blueprint:0.3.1]
        at 
org.apache.aries.blueprint.container.BlueprintRepository.createAll(BlueprintRepository.java:147)[31:org.apache.aries.blueprint:0.3.1]
        at 
org.apache.aries.blueprint.container.BlueprintContainerImpl.instantiateEagerComponents(BlueprintContainerImpl.java:640)[31:org.apache.aries.blueprint:0.3.1]
        at 
org.apache.aries.blueprint.container.BlueprintContainerImpl.doRun(BlueprintContainerImpl.java:331)[31:org.apache.aries.blueprint:0.3.1]
        at 
org.apache.aries.blueprint.container.BlueprintContainerImpl.run(BlueprintContainerImpl.java:227)[31:org.apache.aries.blueprint:0.3.1]
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)[:1.6.0_26]
        at 
java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)[:1.6.0_26]
        at java.util.concurrent.FutureTask.run(FutureTask.java:138)[:1.6.0_26]
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:98)[:1.6.0_26]
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:206)[:1.6.0_26]
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)[:1.6.0_26]
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)[:1.6.0_26]
        at java.lang.Thread.run(Thread.java:680)[:1.6.0_26]

If I remove the generic specification from the MyClass3 constructor,
everything works OK:

public class MyClass3 {
        public MyClass3(MyClass1 myClass1, MyInterface myInterface) {
}
}

Is that what is supposed to happen? Am I not allowed to use generics
in constructor arguments?

thanks in advance,
Gareth