[weld-dev] Is an interceptor with @Target(METHOD, CONSTRUCTOR, TYPE) a problem?

[Marius Bogoevici]

Hi Marcin,

Only annotations with @Target({ElementType.METHOD, ElementType.TYPE}) or @Target({ElementType.TYPE}) can be interceptor bindings (chapter 1 of the spec).

CDI interceptors cannot be defined for constructors per se (so there's no around-constructor semantics), but you can have a @PostConstruct method on a @Target({ElementType.TYPE}) interceptor, which effectively executes after the instance has been created and CDI-injected.

Hope this helps,
Marius

On 2010-07-17, at 5:36 PM, Marcin Zajączkowski wrote:

> Hi,
> 
> 
> I'm trying to write mocked unit tests for my interceptor using
> mechanisms given by AbstractWeldTest and jboss-test-harness package.
> 
> My test class extends AbstractWeldTest, had Artifact and WebBeans
> (pointing to beans.xml with my interceptor defined) annotations.
> 
> My interceptor seems normal for me:
> @Target({ElementType.METHOD, ElementType.CONSTRUCTOR, ElementType.TYPE})
> @Retention(RetentionPolicy.RUNTIME)
> @InterceptorBinding
> public @interface Perf4jProfiled {
> }
> 
> When I run a very simple test, I've got:
> 23:06:53.505 [main] DEBUG org.jboss.weld.Reflection - WELD-000602
> interface net.sf.perf4cdi.api.Perf4jProfiled is not declared
> @Target(TYPE, METHOD) or @Target(TYPE)
> org.jboss.weld.exceptions.DeploymentException: WELD-000069 An
> interceptor must have at least one binding, but
> net.sf.perf4cdi.Perf4jProfiledInterceptor has none
> 	at org.jboss.weld.bean.InterceptorImpl.<init>(InterceptorImpl.java:71)
> 	at org.jboss.weld.bean.InterceptorImpl.of(InterceptorImpl.java:55)
> 	at
> org.jboss.weld.bootstrap.AbstractBeanDeployer.createInterceptor(AbstractBeanDeployer.java:255)
> 	at org.jboss.weld.bootstrap.BeanDeployer.createBeans(BeanDeployer.java:106)
> 	at
> org.jboss.weld.bootstrap.BeanDeployment.deployBeans(BeanDeployment.java:151)
> 	at
> org.jboss.weld.bootstrap.WeldBootstrap.deployBeans(WeldBootstrap.java:377)
> 	at
> org.jboss.weld.mock.MockServletLifecycle.beginApplication(MockServletLifecycle.java:121)
> 	at org.jboss.weld.mock.TestContainer.startContainer(TestContainer.java:85)
> 	at
> org.jboss.weld.test.harness.AbstractStandaloneContainersImpl.deploy(AbstractStandaloneContainersImpl.java:40)
> 	at org.jboss.testharness.AbstractTest.deployArtifact(AbstractTest.java:103)
> 	at org.jboss.testharness.AbstractTest.beforeClass(AbstractTest.java:206)
> 	at
> org.jboss.weld.test.AbstractWeldTest.beforeClass(AbstractWeldTest.java:57)
> 
> 
> When I remove CONSTRUCTOR it works better (there is another problem, but
> not related I have to debug it).
> 
> I would like to ask if this is a limitation of CDI that an interceptor
> cannot be put on constructor?
> 
> 
> Regards
> Marcin
> 
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