The following constellation leads to an NPE-Exception which aborts the startup process:
- A CDI-Bean inherits from an generic abstract class and
- overwrites their abstract method.
- The abstract method must return a typeparameter.
- The method of the CDI-Bean must have an InterceptorBinding-Annotation
Code-Snippets (full Implementation can be found in the Example.zip)
{code:java}
@ApplicationScoped
public class CarRepairer extends Repairer<Car> {
@Override
// Without the transactional annotation the bean would be loaded.
@Transactional
public Car repair() {
return new Car();
}
}
// Without generic, the bean would be loaded
public abstract class Repairer<T> {
// If this method would not be abstract, everything would be fine
public abstract T repair();
}
{code}
Code-Snippets using generic inheritance(full Implementation can be found in the GenericInheritance.zip)
{code:java}
@ApplicationScoped
public class CarRepairer extends Repairer<Car> {
@Override
// Without the transactional annotation the bean would be loaded.
@Transactional
public Car repair() {
return new Car();
}
}
// Without generic, the bean would be loaded
// Pullrequest https://github.com/weld/core/pull/1801
// does not help if generic inherits from another class.
public abstract class Repairer<T extends Vehicle> {
// If this method would not be abstract, everything would be fine
public abstract T repair();
}
{code}
Exception:
{code:java}
Caused by: org.jboss.weld.exceptions.WeldException: WELD-001524: Unable to load proxy class for bean Managed Bean [class weldtest.CarRepairer] with qualifiers [@Any @Default] with class class weldtest.CarRepairer using classloader WebappClassLoader
context: app#tcorder
delegate: false
at org.jboss.weld.bean.proxy.ProxyFactory.getProxyClass(ProxyFactory.java:398)
at org.jboss.weld.injection.producer.SubclassedComponentInstantiator.createEnhancedSubclass(SubclassedComponentInstantiator.java:113)
at org.jboss.weld.injection.producer.SubclassedComponentInstantiator.initEnhancedSubclass(SubclassedComponentInstantiator.java:86)
at org.jboss.weld.injection.producer.SubclassedComponentInstantiator.<init>(SubclassedComponentInstantiator.java:79)
at org.jboss.weld.injection.producer.SubclassedComponentInstantiator.forInterceptedDecoratedBean(SubclassedComponentInstantiator.java:63)
at org.jboss.weld.injection.producer.BeanInjectionTarget.initializeAfterBeanDiscovery(BeanInjectionTarget.java:121)
at org.jboss.weld.injection.producer.InjectionTargetInitializationContext.initialize(InjectionTargetInitializationContext.java:42)
at org.jboss.weld.injection.producer.InjectionTargetService.initialize(InjectionTargetService.java:63)
at org.jboss.weld.bootstrap.WeldStartup.deployBeans(WeldStartup.java:465)
at org.jboss.weld.bootstrap.WeldBootstrap.deployBeans(WeldBootstrap.java:83)
at org.jboss.weld.environment.servlet.WeldServletLifecycle.initialize(WeldServletLifecycle.java:236)
at org.jboss.weld.environment.servlet.EnhancedListener.onStartup(EnhancedListener.java:62)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5302)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
... 14 more
Caused by: org.jboss.weld.exceptions.WeldException
at org.jboss.weld.bean.proxy.InterceptedSubclassFactory.addMethodsFromClass(InterceptedSubclassFactory.java:236)
at org.jboss.weld.bean.proxy.InterceptedSubclassFactory.addMethods(InterceptedSubclassFactory.java:119)
at org.jboss.weld.bean.proxy.ProxyFactory.createProxyClass(ProxyFactory.java:477)
at org.jboss.weld.bean.proxy.ProxyFactory.getProxyClass(ProxyFactory.java:390)
... 27 more
Caused by: java.lang.NullPointerException
at org.jboss.weld.bean.proxy.InterceptedSubclassFactory.createDelegateToSuper(InterceptedSubclassFactory.java:281)
at org.jboss.weld.bean.proxy.InterceptedSubclassFactory.createDelegateToSuper(InterceptedSubclassFactory.java:275)
at org.jboss.weld.bean.proxy.InterceptedSubclassFactory.createDelegateMethod(InterceptedSubclassFactory.java:459)
at org.jboss.weld.bean.proxy.InterceptedSubclassFactory.addMethodsFromClass(InterceptedSubclassFactory.java:148)
... 30 more
{code}
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