Karaf 2.3.0 blueprint static factory bug

[CLEMENT Jean-Philippe <je...@fr.thalesgroup.com>]

Dear Karaf team,

I have a problem with blueprint static factories.

I made a class I use as a static factory:
            <bean id="testfactory" class="test.TestFactory" factory-method="staticFactory"/>

Then I try to inject testfactory to another bean as an argument:
            <bean id="testbean" class="test.TestBean">
                        <argument ref="testfactory"/>
            </bean>

The factory class is like this:

public final class TestFactory implements TestInterface {
            private static final TestInterface FACTORY= new TestFactory();

            private TestFactory() {}

            public TestInterface staticFactory() {
                        return FACTORY;
            }

The TestBean constructor like that:

public final class TestBean {
            public TestBean(final TestInterface test) { ...}
}

This fails stating that no constructor can match. However:
* if I add a TestBean constructor taking an Object as argument, this test succeeds
* if I construct a bean implementing TestInterface, the constructor (taking TestInterface) is found.

I don't know what can be the problem. Is this kind of trouble already known?

PS: TestInterface is in fact using generics

Cheers,
JP

[@@ OPEN @@]

RE: Karaf 2.3.0 blueprint static factory bug

[CLEMENT Jean-Philippe <je...@fr.thalesgroup.com>]

More info,

I succeeded in fixing this issue changing the generic type :S

To be more precise,

The TestBean constructor is like this:
            public TestBean(final TestInterface<? Extends Component> test) { ...}

If the implementation is this way, blueprint find the test bean constructor:
            public TestInterface<Component> staticFactory() { ... }

But, if the implementation is this way, blueprint fails to find test bean constructor:
            public TestInterface<JPanel> staticFactory() { ... }

Note that this bug is not related to the static factory as I reproduced this issue with direct bean construction (i.e. changing private constructor to public removing "factory-method" option from blueprint.

So it seems to be a generics related problem. Any idea?

Cheers,
Jean-Philippe

[@@ OPEN @@]

De : CLEMENT Jean-Philippe [mailto:jean-philippe.clement@fr.thalesgroup.com]
Envoyé : lundi 3 juin 2013 15:34
À : user@karaf.apache.org
Objet : Karaf 2.3.0 blueprint static factory bug

Dear Karaf team,

I have a problem with blueprint static factories.

I made a class I use as a static factory:
            <bean id="testfactory" class="test.TestFactory" factory-method="staticFactory"/>

Then I try to inject testfactory to another bean as an argument:
            <bean id="testbean" class="test.TestBean">
                        <argument ref="testfactory"/>
            </bean>

The factory class is like this:

public final class TestFactory implements TestInterface {
            private static final TestInterface FACTORY= new TestFactory();

            private TestFactory() {}

            public TestInterface staticFactory() {
                        return FACTORY;
            }

The TestBean constructor like that:

public final class TestBean {
            public TestBean(final TestInterface test) { ...}
}

This fails stating that no constructor can match. However:
* if I add a TestBean constructor taking an Object as argument, this test succeeds
* if I construct a bean implementing TestInterface, the constructor (taking TestInterface) is found.

I don't know what can be the problem. Is this kind of trouble already known?

PS: TestInterface is in fact using generics

Cheers,
JP

[@@ OPEN @@]