spring 处理程序异常没有适配器
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No adapter for handler exception
提问by Harish
I'm developing a web application using spring mvc framework. I want to to both annotation and beanName based url mappings.
我正在使用 spring mvc 框架开发 Web 应用程序。我想要基于注释和 beanName 的 url 映射。
I've the following configurations in my context file
我的上下文文件中有以下配置
<mvc:annotation-driven />
<bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"></bean>
My annotation based controllers are working fine but beanNamed based url mapping are throwing the exception "No adapter for handler".
我的基于注释的控制器工作正常，但基于 beanNamed 的 url 映射抛出异常“没有处理程序的适配器”。
What am I doing wrong here?
我在这里做错了什么？
Thank you
谢谢
回答by Arun P Johny
By default the spring mvc defines 3 different request handler adapters, they are
默认情况下，spring mvc 定义了 3 个不同的请求处理程序适配器，它们是
org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter
org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter
So you need not have to define them in your context file, but if you define at least one handler adapter in your context files, spring will not create the default adapters.
所以你不需要在你的上下文文件中定义它们，但是如果你在你的上下文文件中定义了至少一个处理程序适配器，spring 将不会创建默认适配器。
In your configuraion you are using <mvc:annotation-driven />, according to thisspring documentation this will cause the context to define both DefaultAnnotationHandlerMappingand AnnotationMethodHandlerAdapter. Since we are creating the AnnotationMethodHandlerAdapterin our context definition spring will not create the other two handlerAdapters. That is why you are getting the said exception.
在您使用的配置中<mvc:annotation-driven />，根据这个spring 文档，这将导致上下文同时定义DefaultAnnotationHandlerMapping和AnnotationMethodHandlerAdapter。由于我们AnnotationMethodHandlerAdapter在上下文定义中创建了spring，因此不会创建其他两个 handlerAdapter。这就是为什么您会收到上述异常。
The beanNameUrlMapping needs the handlerAdapter SimpleControllerHandlerAdapter.
beanNameUrlMapping 需要 handlerAdapter SimpleControllerHandlerAdapter。
To resolve this exception you can simply create a new bean of type "SimpleControllerHandlerAdapter" in your context.
要解决此异常，您只需在您的上下文中创建一个类型为“SimpleControllerHandlerAdapter”的新 bean。
<bean
class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter">
</bean>
回答by Ankit
The same thing happened to me when I was trying to integrate spring MVC 2.5 with spring web flow. For webflow I have given FlowHandlerdAdapter in the configuration file but none for MVC. Thereby as said above we need to define a BEAN of type simplecontrollerhandleradapter in this case which will solve the problem.
当我尝试将 spring MVC 2.5 与 spring web flow 集成时，同样的事情发生在我身上。对于 webflow，我在配置文件中提供了 FlowHandlerdAdapter，但没有为 MVC 提供。因此，如上所述，在这种情况下，我们需要定义一个 simplecontrollerhandleradapter 类型的 BEAN，这将解决问题。
