WELD-001519为抽象类'xxx'创建了一个InjectionTarget实现.不可能生成这种类型的实例

Question

我正在以下环境中运行应用程序.

• GlassFish Server 4.0
• Mojarra 2.2.4
• PrimeFaces 4.0决赛
• PrimeFaces Extension 1.1.0
• OmniFaces 1.6.3

添加OmniFaces后,服务器终端上会显示以下警告.

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.filter.HttpFilter. It will not be possible to produce instances of this type!

//WARNING:   Class 'javax.ejb.PostActivate' not found, interception based on it is not enabled
//WARNING:   Class 'javax.ejb.PrePassivate' not found, interception based on it is not enabled
INFO:   Initializing Mojarra 2.2.4 ( 20131003-1354 https://svn.java.net/svn/mojarra~svn/tags/2.2.4@12574) for context '/Project-war'

WARNING:   WELD-001529 An InjectionTarget implementation is created for a class org.omnifaces.application.OmniApplicationFactory which does not have any appropriate constructor.
WARNING:   WELD-001529 An InjectionTarget implementation is created for a class org.primefaces.context.PrimeFacesContextFactory which does not have any appropriate constructor.
WARNING:   WELD-001529 An InjectionTarget implementation is created for a class org.omnifaces.context.OmniPartialViewContextFactory which does not have any appropriate constructor.
WARNING:   WELD-001529 An InjectionTarget implementation is created for a class org.primefaces.context.PrimePartialViewContextFactory which does not have any appropriate constructor.

INFO:   Running on PrimeFaces 4.0
INFO:   Running on PrimeFaces Extensions null
INFO:   Using OmniFaces version null

INFO:   Loading application [Project#Project-war.war] at [Project-war]
INFO:   Project was successfully deployed in 22,734 milliseconds.

OmniFaces在给定环境中有任何问题吗？

Answer 1

不,这些只是警告,而不是错误.Weld无法为没有默认构造函数的抽象类或类创建注入目标.注射目标需要能够Class.forName(className).newInstance()毫无困难地完成.

记录中的这种干扰已经报告为焊接问题1547,因此自Weld 2.1.1/2.2.0起,警告级别降低到DEBUG级别.

注意到应该存在另一个错误,很可能与GlassFish类加载有关.OmniFaces有一个VetoAnnotatedTypeExtension应该排除所有那些OmniFaces类不必要地被扫描为CDI托管bean.当在Tomcat 7和JBoss 6/7/8中使用Weld时,这可以正常工作.也就是说OmniFaces类没有出现这些警告.