15. Failed to resolve: junit:junit:4.12，Failed to resolve: javax.inject:javax.inject:1......

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问题：

在帮别人配置AS时，用的gradle编译是最新版本3.3，在离线（Office Mode）的状态下新建一个项目时出现以下错误：

Error: Failed to resolve: junit:junit:4.12Failed to resolve: javax.inject:javax.inject:1Failed to resolve: javax.annotation:javax.annotation-api:1.2Failed to resolve: com.google.code.findbugs:jsr305:2.0.1Failed to resolve: org.hamcrest:hamcrest-library:1.3Failed to resolve: org.hamcrest:hamcrest-integration:1.3Failed to resolve: com.squareup:javawriter:2.1.1

app中build.gradle文件：

apply plugin: 'com.android.application'android {    compileSdkVersion 24    buildToolsVersion "24.0.3"    defaultConfig {        applicationId "test.app.stannah.com.uk"        minSdkVersion 15        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'        }    }}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'}

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原因及解决方法：

原因很简单，单纯的网络连接问题。解决办法就是将不需要的library去掉，将以下代码展示的库依赖去掉，重新编译即可。

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'})testCompile 'junit:junit:4.12'

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在 stackoverflow中找到相应的解答：
http://stackoverflow.com/questions/40396765/android-studio-v2-2-2-error27-17-failed-to-resolve-junitjunit4-12

所以啊，遇到错误千万莫方，Android如今发展的太成熟了，你遇到的错误别人肯定遇到过，百度谷歌一下，你就get。