java.lang.NoClassDefFoundError: org/apache/http/conn/params/ConnPerRoute

Question

我收到 java.lang.NoClassDefFoundError: org/apache/http/conn/params/ConnPerRoute

当我尝试使用 Spring、Android REST 框架时发生此错误。代码相当简单，如下所示。

在我看来，这个问题应该是一个依赖问题，但我已经包含了所需的 Spring 依赖和 org.apache.httpcomponents', 'httpclient-android' 依赖问题仍然存在。

我不知道如何继续。下面是问题代码的 sn-p，以及我的 build.gradle 文件和完整的异常打印输出。

谁能帮我解决这个问题？非常感谢。

错误：

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/http/conn/params/ConnPerRoute
    at org.springframework.http.client.support.HttpAccessor.<init>(HttpAccessor.java:71)
    at org.springframework.http.client.support.InterceptingHttpAccessor.<init>(InterceptingHttpAccessor.java:36)
    at org.springframework.web.client.RestTemplate.<init>(RestTemplate.java:156)
    at com.lazeebear.ServerConnector.ServerConnector.signin(ServerConnector.java:27)
    at com.lazeebear.main.main(main.java:12)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)
Caused by: java.lang.ClassNotFoundException: org.apache.http.conn.params.ConnPerRoute
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 10 more

代码： public static boolean signin(String email, String password) {

        // Define endpoint
        String url = baseURL + signinEndpoint;

        // Create parameters for POST request
        String parameters = "?email=" + email + "&password=" + password;

        // Make POST request
        RestTemplate restTemplate = new RestTemplate();
        ResponseEntity<Object> entity = restTemplate.postForEntity(url, getHeaders(), Object.class, parameters);

        // Get and set cookies
        List<String> cookies = entity.getHeaders().get(COOKIES_HEADER);
        setCookies(cookies);

        HttpStatus status = entity.getStatusCode();
        if (status.equals(HttpStatus.OK)) {
            return true;
        }
        else {
            return false;
        }
    }

build.gradle： 应用插件：'com.android.application'

android {
    compileSdkVersion 24
    buildToolsVersion "24.0.3"
    defaultConfig {
        applicationId "com.lazeebear"
        minSdkVersion 19
        targetSdkVersion 24
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    packagingOptions {
        exclude 'META-INF/DEPENDENCIES.txt'
        exclude 'META-INF/LICENSE.txt'
        exclude 'META-INF/NOTICE.txt'
        exclude 'META-INF/NOTICE'
        exclude 'META-INF/LICENSE'
        exclude 'META-INF/DEPENDENCIES'
        exclude 'META-INF/notice.txt'
        exclude 'META-INF/license.txt'
        exclude 'META-INF/dependencies.txt'
        exclude 'META-INF/LGPL2.1'
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:24.2.1'
    testCompile 'junit:junit:4.12'

    // Dependencies for payment
    compile 'com.braintreepayments.api:braintree:2.+'
    compile 'com.braintreepayments.api:drop-in:2.+'

    // Dependencies for Spring
    compile 'org.springframework.android:spring-android-rest-template:2.0.0.M3'
    compile 'com.fasterxml.jackson.core:jackson-databind:2.3.2'

    // Dependencies for GSON
    compile group: 'com.google.code.gson', name: 'gson', version: '2.4'

    // Test
    compile group: 'org.apache.httpcomponents', name: 'httpclient-android', version: '4.3.3'
}

Answer 1

如果您查看 httpclient-android JAR 的内容，则该类不存在。

然而，该类确实存在于：

org.apache.httpcomponents http-client JAR。

http://www.findjar.com/class/org/apache/http/conn/params/ConnPerRoute.html