服务器启动过程中，函数isAssignableFrom返回false

Z时代
2024-01-10
分类：问答

实施oauth2系统时，以下代码存在一些问题：

import org.springframework.security.oauth2.provider.endpoint.FrameworkEndpointHandlerMapping;
import org.springframework.web.servlet.HandlerMapping;
...
HandlerMapping.class.isAssignableFrom(FrameworkEndpointHandlerMapping.class);

实际上，当类FrameworkEndpointHandlerMapping正在实现接口时HandlerMapping，此函数应始终返回true。在此功能上运行单元测试时就是这种情况。但是，在服务器启动期间，此函数返回false（使用调试器检查）。这是一个很大的问题，因为DispatcherServlet实例化时，它将搜索实现的类，HandlerMapping并且将my

FrameworkEndpointHandlerMapping丢弃，从而导致应用程序中的错误。

我已经搜索了其他类似问题，但其中大多数回答说该isAssignableFrom方法未正确使用（类和函数参数的混合）。因为JUnit在工作，所以这里不是这种情况。

怀疑导入的jar文件是问题，我将它们限制为以下文件：

spring-beans-4.1.4.RELEASE.jar

spring-security-oauth2-2.0.6.RELEASE.jar

spring-webmvc-4.1.4.RELEASE.jar (also tried with the 4.0.9)

spring-core-4.1.4.RELEASE.jar

您对解决方案有什么想法吗？

有关更多信息，请参见以下资源：

我自己的DispatcherServlet（String作为参数的构造函数由JUnit测试调用，而默认构造函数在系统启动期间被调用）

import org.junit.Assert;
import org.springframework.security.oauth2.provider.endpoint.FrameworkEndpointHandlerMapping;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.servlet.DispatcherServlet;
import org.springframework.web.servlet.HandlerMapping;
import org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping;
public class MobileDispatcherServlet extends DispatcherServlet
{
    private static final long serialVersionUID = 1L;
    public MobileDispatcherServlet()
    {
        super();
        HandlerMapping.class.isAssignableFrom(FrameworkEndpointHandlerMapping.class);
    }
    public MobileDispatcherServlet(final WebApplicationContext webApplicationContext)
    {
        super(webApplicationContext);
        final FrameworkEndpointHandlerMapping handlerMapping = webApplicationContext.getBean(FrameworkEndpointHandlerMapping.class);
        HandlerMapping.class.isAssignableFrom(handlerMapping.getClass());
    }
    public MobileDispatcherServlet(final String test)
    {
        Assert.assertTrue(HandlerMapping.class.isAssignableFrom(FrameworkEndpointHandlerMapping.class));
    }
}

该oauth配置文件：

<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:security="http://www.springframework.org/schema/security" xmlns:oauth="http://www.springframework.org/schema/security/oauth2" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/security http://www.springframework.org/schema/security/spring-security.xsd http://www.springframework.org/schema/security/oauth2 http://www.springframework.org/schema/security/spring-security-oauth2.xsd">   <oauth:authorization-server client-details-service-ref="clientDetails" token-services-ref="tokenServices" user-approval-handler-ref="userApprovalHandler" authorization-endpoint-url="/oauth/authorize.action" token-endpoint-url="/oauth/token.action" > <oauth:authorization-code authorization-code-services-ref="authorizationCodeServices" disabled="false" /> <oauth:refresh-token /> </oauth:authorization-server> ... </beans>

的web.xml：

<web-app id="sitestorefront" version="3.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app.xsd"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app.xsd" 
         metadata-complete="true">
...
    <context-param>
        <description>
            The 'contextConfigLocation' param specifies where your configuration files are located.
            The 'WEB-INF/config/web-application-config.xml' file includes several other XML config
            files to build up the configuration for the application.
        </description>
        <param-name>contextConfigLocation</param-name>
        <param-value>WEB-INF/config/web-application-config.xml</param-value>
    </context-param>
    <context-param>
        <param-name>tagpoolMaxSize</param-name>
        <param-value>50</param-value>
    </context-param>
<servlet>
        <description>
            DispatcherServlet
        </description>
        <servlet-name>DispatcherServlet</servlet-name>
        <servlet-class>be.sbh.site.storefront.oauth2.MobileDispatcherServlet</servlet-class>
        <init-param>
            <description>
                Specifies the location for Spring MVC to load an additional XML configuration file.
                Because hybris is already configured with the XML spring configuration files to load
                we must set this param value to EMPTY in order to prevent loading of the default
                /WEB-INF/applicationContext.xml file.
            </description>
            <param-name>contextConfigLocation</param-name>
            <param-value></param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>DispatcherServlet</servlet-name>
        <!-- Map all requests to the DispatcherServlet -->
        <url-pattern>/</url-pattern>
    </servlet-mapping>
...
</web-app>