Jerome MICHEL created ARIES-1957:
------------------------------------
Summary: Using Generic types throws Unknown type exception
Key: ARIES-1957
URL: https://issues.apache.org/jira/browse/ARIES-1957
Project: Aries
Issue Type: Bug
Components: Blueprint
Affects Versions: blueprint-core-1.8.0
Environment: Karaf 4.2.6
JDK 11.5
Reporter: Jerome MICHEL
We are currently trying to migrate from Karaf 4.1.1 which uses Apache Aries
Blueprint v1.8.0 to Karaf 4.2.6 which uses Aries Blueprint v1.10.2
While we were able to handle beans with Generic constructors in the previous
version, any usage of Generics now throws a RuntimeException saying the type is
not known.
With this definition in Blueprint :
{code:java}
<bean id="sharedModel" class="javafx.beans.property.SimpleObjectProperty>
<argument>
<bean class="com.example.MySuperModel" />
</argument>
</bean>{code}
The definition of the javaFX class is like :
{code:java}
public class SimpleObjectProperty<T> extends ObjectPropertyBase<T> {
[...]
public SimpleObjectProperty() {
...
}
public SimpleObjectProperty(T var) {
...
}
}{code}
The instanciation of this bean result in :
{code:java}
2019-12-05T09:35:44,162 | ERROR | Blueprint Extender: 3 |
org.apache.aries.blueprint.container.BlueprintContainerImpl | 102 -
org.apache.aries.blueprint.core - 1.10.2 | Unable to start container for
blueprint bundle com.tus.hci.project.flf.hmi/1.4.0.SNAPSHOT
org.osgi.service.blueprint.container.ComponentDefinitionException: Unable to
instantiate components
at
org.apache.aries.blueprint.container.BlueprintContainerImpl.instantiateEagerComponents(BlueprintContainerImpl.java:741)
~[102:org.apache.aries.blueprint.core:1.10.2]
at
org.apache.aries.blueprint.container.BlueprintContainerImpl.doRun(BlueprintContainerImpl.java:433)
[102:org.apache.aries.blueprint.core:1.10.2]
at
org.apache.aries.blueprint.container.BlueprintContainerImpl.run(BlueprintContainerImpl.java:298)
[102:org.apache.aries.blueprint.core:1.10.2]
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) [?:?]
at java.util.concurrent.FutureTask.run(FutureTask.java:264) [?:?]
at
org.apache.aries.blueprint.container.ExecutorServiceWrapper.run(ExecutorServiceWrapper.java:106)
[102:org.apache.aries.blueprint.core:1.10.2]
at
org.apache.aries.blueprint.utils.threading.impl.DiscardableRunnable.run(DiscardableRunnable.java:45)
[102:org.apache.aries.blueprint.core:1.10.2]
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) [?:?]
at java.util.concurrent.FutureTask.run(FutureTask.java:264) [?:?]
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304)
[?:?]
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
[?:?]
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
[?:?]
at java.lang.Thread.run(Thread.java:834) [?:?]
Caused by: java.lang.RuntimeException: Unknown type T
at
org.apache.aries.blueprint.utils.generics.TypeInference.getParameters(TypeInference.java:449)
~[?:?]
at
org.apache.aries.blueprint.utils.generics.TypeInference.match(TypeInference.java:262)
~[?:?]
at
org.apache.aries.blueprint.utils.generics.TypeInference.findMatching(TypeInference.java:231)
~[?:?]
at
org.apache.aries.blueprint.utils.generics.TypeInference.findMatchingConstructors(TypeInference.java:125)
~[?:?]
at
org.apache.aries.blueprint.container.BeanRecipe.findMatchingConstructors(BeanRecipe.java:373)
~[?:?]
at
org.apache.aries.blueprint.container.BeanRecipe.getInstanceFromType(BeanRecipe.java:346)
~[?:?]
at
org.apache.aries.blueprint.container.BeanRecipe.getInstance(BeanRecipe.java:283)
~[?:?]
at
org.apache.aries.blueprint.container.BeanRecipe.internalCreate2(BeanRecipe.java:685)
~[?:?]
at
org.apache.aries.blueprint.container.BeanRecipe.internalCreate(BeanRecipe.java:666)
~[?:?]
at
org.apache.aries.blueprint.di.AbstractRecipe$1.call(AbstractRecipe.java:81)
~[?:?]
at java.util.concurrent.FutureTask.run(FutureTask.java:264) ~[?:?]
at
org.apache.aries.blueprint.di.AbstractRecipe.create(AbstractRecipe.java:90)
~[?:?]
at
org.apache.aries.blueprint.container.BlueprintRepository.createInstances(BlueprintRepository.java:360)
~[?:?]
at
org.apache.aries.blueprint.container.BlueprintRepository.createAll(BlueprintRepository.java:190)
~[?:?]
at
org.apache.aries.blueprint.container.BlueprintContainerImpl.instantiateEagerComponents(BlueprintContainerImpl.java:737)
~[?:?]
... 12 more
{code}
We tried to investigate around this error trying to know if we made a mistake
on our side.
As far as we tested and tried to debug in the blueprint's classes, we found
that when blueprint is matching constructors from what the class has and the
parameters he received only _Class_ and _ParametrizedType_ are handled in
_TypeInference#getParameters(Type)_. But due to genericity, we arrived with a
_TypeVariable,_ which is of type T with Object as generic bound.
So maybe this type can also be handled like other cases ?
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