Question

我现在正在努力构建一个休息服务，但是使用默认的connectionManager（SimpleHttpConnectionManager），我只能在长期事务处理方法中维持一个连接。所以我尝试使用MultiThreadedHttpConnectionManager初始化bean

我的pom：

<properties>
    <resteasy.version>2.1.0.GA</resteasy.version>
    <spring.version>3.0.5.RELEASE</spring.version>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-beans</artifactId>
        <version>3.0.5.RELEASE</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>3.0.5.RELEASE</version>
        <scope>provided</scope>
    </dependency>
<dependency>
        <groupId>org.jboss.resteasy</groupId>
        <artifactId>resteasy-spring</artifactId>
        <version>${resteasy.version}</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>org.jboss.resteasy</groupId>
        <artifactId>resteasy-jackson-provider</artifactId>
        <version>${resteasy.version}</version>
        <scope>provided</scope>
    </dependency>

我的applicationContext.xml

<bean id="httpClient" class="org.apache.commons.httpclient.HttpClient">
    <constructor-arg>
        <bean class="org.apache.commons.httpclient.MultiThreadedHttpConnectionManager"
            p:maxConnectionsPerHost="10"
            p:maxTotalConnections="20"/>
    </constructor-arg>
</bean>
<bean id="myRestService"
    class="org.jboss.resteasy.client.spring.RestClientProxyFactoryBean"
    p:serviceInterface="com.me.service.myRestService"
    p:baseUri="${serviceNameUrl}" 
    p:httpClient-ref="restHttpClient"/>

但是当我启动jboss 6服务器时，我遇到以下异常：

09:37:44,774 ERROR [ContextLoader] Context initialization failed: org.springframework.beans.factory.BeanCreationException:nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No matching bean of type [com.me.service.myRestService] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
Related cause: org.springframework.beans.factory.BeanCreationException: 
Error creating bean with name 'myRestService' defined in ServletContext resource [/WEB-INF/applicationContext.xml]: 
Initialization of bean failed; nested exception is org.springframework.beans.ConversionNotSupportedException: 
Failed to convert property value of type 'org.apache.commons.httpclient.HttpClient' to required type 'org.apache.commons.httpclient.HttpClient' for property 'httpClient'; 
nested exception is java.lang.IllegalStateException: Cannot convert value of type [org.apache.commons.httpclient.HttpClient] to required type [org.apache.commons.httpclient.HttpClient] for property 'httpClient': 
no matching editors or conversion strategy found

我尝试搜索resteasy包的依赖版本。但是必需的commons-httpclient是相同的（版本3.1）。那么为什么“HttpClient”无法转换为“HttpClient”？

Answer 1

最后得到这个工作，问题是我添加了第三方依赖：

    <dependency>
     <groupId>net.java.dev.jets3t</groupId>
     <artifactId>jets3t</artifactId>
      <version>0.8.0</version>
</dependency>

但我没有说明：

    <scope>provided</scope>

这将导致commons-httpclient-3.1.jar将在最终的war文件中得到遵守。

同时，我在{jboss_home} / server / default / lib目录中添加了commons-httpclient-3.1.jar。因此jboss classloader将在启动时加载httpclient，并且在加载这些bean时，将从包中加载httpclient，这将导致上述异常。

所以总是要注意那些第三方依赖，我认为90％的那些不能从同一个Object转换为相同的Object异常是由于这个重复的加载器问题引起的。

MultiThreadedHttpConnectionManager无法注入服务

1 个答案: