警告：List< Bean<>>类型的参数1>来自public void org.omnifaces.cdi.eager.EagerBeansRepository.setXxx不能解析为具体类型 [英] WARNING: Parameter 1 of type List<Bean<?>> from public void org.omnifaces.cdi.eager.EagerBeansRepository.setXxx is not resolvable to a concrete type

问题描述

我使用的是Omnifaces 1.8.1，并且每当我将应用程序部署到Glassfish时，我都会收到以下警告，这会在部署过程中造成一些延迟。

 警告：WELD-001519为抽象类org.omnifaces.eventlistener.DefaultHttpSessionListener创建了一个InjectionTarget实现。不可能产生这种类型的实例！ 
警告：WELD-001519为抽象类org.omnifaces.eventlistener.DefaultServletContextListener创建了一个InjectionTarget实现。不可能产生这种类型的实例！ 
警告：WELD-001519为抽象类org.omnifaces.eventlistener.DefaultServletRequestListener创建了一个InjectionTarget实现。不可能产生这种类型的实例！ 
警告：WELD-001519为抽象类org.omnifaces.filter.HttpFilter创建InjectionTarget实现。不可能产生这种类型的实例！ 
 
警告：已检测到以下警告：
 
警告：类型为java.util.List的参数1< javax.enterprise.inject.spi.Bean<？> > from public void org.omnifaces.cdi.eager.EagerBeansRepository.setApplicationScopedBeans（java.util.List< javax.enterprise.inject.spi.Bean<>>）不能解析为具体的类型。 
警告：类型为java.util.Map的参数1< java.lang.String，java.util.List< javax.enterprise.inject.spi.Bean<>>> from public void org.omnifaces.cdi.eager.EagerBeansRepository.setRequestScopedBeansViewId（java.util.Map< java.lang.String，java.util.List< javax.enterprise.inject.spi.Bean<>>> ）不能解析为具体类型。 
警告：类型为java.util.Map的参数1< java.lang.String，java.util.List< javax.enterprise.inject.spi.Bean<>>> from public void org.omnifaces.cdi.eager.EagerBeansRepository.setRequestScopedBeansRequestURI（java.util.Map< java.lang.String，java.util.List< javax.enterprise.inject.spi.Bean<>>> ）不能解析为具体类型。 
警告：类型为java.util.List的参数1< javax.enterprise.inject.spi.Bean<？>> from public void org.omnifaces.cdi.eager.EagerBeansRepository.setSessionScopedBeans（java.util.List< javax.enterprise.inject.spi.Bean<>>）不能解析为具体类型。 
  

我已经升级到Omnifaces 2.0并且仍然得到相同的警告，这在开发过程中非常烦人部署经常被应用。是什么导致这些警告？

PS：开发环境：

• Glassfish 4.1


• Java 8


• JSF 2.2.0（Mojarra）
  
• Primefaces 4.0


• Netbeans 8

解决方案

这些警告是无辜的，实际上并没有显着延迟部署。对于无法解析的参数警告，CDI确实不支持使用通配符参数化参数的代理方法，如 List <？>> 。然而，这些警告的烦恼却被理解了。由于这些方法无论如何都是包私有的，我已经按照这个提交能见度，以便Weld不会试图检查它们。该修补程序可在 OmniFaces 2.1 SNAPSHOT 。

至于抽象类的WELD-001519警告，这确实是完全没有必要的。这已经在Weld 2.1.1 / 2.2.0中修复了。另请参阅重复问题：WELD-001519 An InjectionTarget实现是为抽象类xxx创建的。无法生成此类型的实例。

I'm using Omnifaces 1.8.1 and Whenever I deploy my application to Glassfish I get the following warning which causes some delay in the deploy process.

Warning:   WELD-001519 An InjectionTarget implementation is created for an abstract class org.omnifaces.eventlistener.DefaultHttpSessionListener. It will not be possible to produce instances of this type!
Warning:   WELD-001519 An InjectionTarget implementation is created for an abstract class org.omnifaces.eventlistener.DefaultServletContextListener. It will not be possible to produce instances of this type!
Warning:   WELD-001519 An InjectionTarget implementation is created for an abstract class org.omnifaces.eventlistener.DefaultServletRequestListener. It will not be possible to produce instances of this type!
Warning:   WELD-001519 An InjectionTarget implementation is created for an abstract class org.omnifaces.filter.HttpFilter. It will not be possible to produce instances of this type!

Warning:   The following warnings have been detected: 

WARNING: Parameter 1 of type java.util.List<javax.enterprise.inject.spi.Bean<?>> from public void org.omnifaces.cdi.eager.EagerBeansRepository.setApplicationScopedBeans(java.util.List<javax.enterprise.inject.spi.Bean<?>>) is not resolvable to a concrete type.   
WARNING: Parameter 1 of type java.util.Map<java.lang.String, java.util.List<javax.enterprise.inject.spi.Bean<?>>> from public void org.omnifaces.cdi.eager.EagerBeansRepository.setRequestScopedBeansViewId(java.util.Map<java.lang.String, java.util.List<javax.enterprise.inject.spi.Bean<?>>>) is not resolvable to a concrete type.
WARNING: Parameter 1 of type java.util.Map<java.lang.String, java.util.List<javax.enterprise.inject.spi.Bean<?>>> from public void org.omnifaces.cdi.eager.EagerBeansRepository.setRequestScopedBeansRequestURI(java.util.Map<java.lang.String, java.util.List<javax.enterprise.inject.spi.Bean<?>>>) is not resolvable to a concrete type.
WARNING: Parameter 1 of type java.util.List<javax.enterprise.inject.spi.Bean<?>> from public void org.omnifaces.cdi.eager.EagerBeansRepository.setSessionScopedBeans(java.util.List<javax.enterprise.inject.spi.Bean<?>>) is not resolvable to a concrete type.

I have upgraded to Omnifaces 2.0 and still getting the same warning which is quite annoying in the development process where deployment is applied frequently. What is causing these warnings?

PS: Development environment:

• Glassfish 4.1
• Java 8
• JSF 2.2.0 (Mojarra)
• Primefaces 4.0
• Netbeans 8

解决方案

This is Weld specific. Those warnings are innocent and actually doesn't significantly delay deploy.

As to unresolvable parameter warning, CDI indeed doesn't support proxying methods with wildcard-parameterized arguments like List<?>. The annoyance of those warnings is however understood. As those methods are package-private anyway, I've reduced as per this commit the visibility so that Weld doesn't attempt to inspect them. The fix is available in OmniFaces 2.1 SNAPSHOT.

As to WELD-001519 warning on abstract classes, this is indeed totally unnecessary. This is already fixed in Weld 2.1.1/2.2.0. See also the duplicate question: WELD-001519 An InjectionTarget implementation is created for an abstract class 'xxx'. It will not be possible to produce instances of this type.

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