Question

我有sendGetREST方法发送一些URL endpoint并获得回复：

@Component
public class HttpURLCommand {
    private static Logger logger = Logger.getLogger(HttpURLCommand.class);

public String sendGetREST(String soapUrl, Object[] parameters) throws IOException{
        final String SOAP_URL = MessageFormat.format(soapUrl, parameters);
        RestTemplate restTemplate = new RestTemplate();
        ResponseEntity<String> response = restTemplate.getForEntity(SOAP_URL, String.class);

    logger.info("status code is: "+response.getStatusCode());
    if(response.getStatusCode().equals(HttpStatus.OK)){
        logger.info("send success");
        return response.getBody();
    }
    else {
        logger.info("send failed");
        return null;
    }

  }
}

哪个效果很好。但是，为了使超时时间可以自定义，我从此tutorial获得了HTTPConfiguration：

@Configuration
public class HTTPConfiguration {

@Bean
public RestTemplate restTemplate() {
    return new RestTemplate(clientHttpRequestFactory());
}

private ClientHttpRequestFactory clientHttpRequestFactory() {
    HttpComponentsClientHttpRequestFactory factory = new HttpComponentsClientHttpRequestFactory();
    factory.setReadTimeout(60000);
    factory.setConnectTimeout(60000);
    return factory;
   }
}

所以这个类会像这样调用restTemplate：

@Component
 public class HttpURLCommand {
    private static Logger logger = Logger.getLogger(HttpURLCommand.class);
    @Autowired
    RestTemplate restTemplate;

public String sendGetREST(String soapUrl, Object[] parameters) throws IOException{
        final String SOAP_URL = MessageFormat.format(soapUrl, parameters);
        ResponseEntity<String> response = restTemplate.getForEntity(SOAP_URL, String.class);

    logger.info("status code is: "+response.getStatusCode());
    if(response.getStatusCode().equals(HttpStatus.OK)){
        logger.info("send success");
        return response.getBody();
    }
    else {
        logger.info("send failed");
        return null;
    }

  }
}

但遗憾的是，在构建spring-boot应用时会返回以下错误：

Caused by: java.lang.NoClassDefFoundError: org/apache/http/protocol/HttpContext
at com.xl.MbbI.config.HTTPConfiguration.clientHttpRequestFactory(HTTPConfiguration.java:25) ~[classes/:na]
at com.xl.MbbI.config.HTTPConfiguration.restTemplate(HTTPConfiguration.java:21) ~[classes/:na]
at com.xl.MbbI.config.HTTPConfiguration$$EnhancerBySpringCGLIB$$191f99f.CGLIB$restTemplate$0(<generated>) ~[na:na]
at com.xl.MbbI.config.HTTPConfiguration$$EnhancerBySpringCGLIB$$191f99f$$FastClassBySpringCGLIB$$8330ce57.invoke(<generated>) ~[na:na]
at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228) ~[spring-core-4.3.0.RC2.jar:4.3.0.RC2]
at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:356) ~[spring-context-4.3.0.RC2.jar:4.3.0.RC2]
at com.xl.MbbI.config.HTTPConfiguration$$EnhancerBySpringCGLIB$$191f99f.restTemplate(<generated>) ~[na:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.7.0_60]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.7.0_60]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.7.0_60]
at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.7.0_60]
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:162) ~[spring-beans-4.3.0.RC2.jar:4.3.0.RC2]
... 24 common frames omitted
Caused by: java.lang.ClassNotFoundException: org.apache.http.protocol.HttpContext
at java.net.URLClassLoader$1.run(Unknown Source) ~[na:1.7.0_60]
at java.net.URLClassLoader$1.run(Unknown Source) ~[na:1.7.0_60]
at java.security.AccessController.doPrivileged(Native Method) ~[na:1.7.0_60]
at java.net.URLClassLoader.findClass(Unknown Source) ~[na:1.7.0_60]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.7.0_60]
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) ~[na:1.7.0_60]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.7.0_60]
... 36 common frames omitted

仅供参考，错误远远超过上面所示。

第一行是：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'restTemplate' defined in class path resource .....

Answer 1

Caused by: java.lang.NoClassDefFoundError: org/apache/http/protocol/HttpContext

错误显示您的类路径存在问题，可能是因为类路径中没有类or.apache.http.protocol.HttpContext。 Spring RestTemplate经常使用这个类。通常我们可以在Apache httpclient库中找到这个类。您应该再次检查您的依赖项。如果找不到，可以考虑添加以下依赖项（如果使用Maven）

 <dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpclient</artifactId>
    <version>4.5.2</version>
</dependency>

创建自定义RestTemplate时，Spring-boot会出错

1 个答案: