关于导入react native项目导致运行异常的那些事

从git上导入公司的项目，在本地运行的时候，项目无法运行。sdk，jdk，node都是使用公司规定的版本，项目中的local.properties文件sdk.dir路径也换成了自己本地的目录，结果就在react-native run-Android的时候，卡着了，等了一个多小时，报错结果如下：

> Task :jpush-react-native:compileDebugJavaWithJavac FAILED

Deprecated Gradle features were used in this build, making it incompatible with Gradle 7.0.
Use '--warning-mode all' to show the individual deprecation warnings.
See https://docs.gradle.org/6.2/userguide/command_line_interface.html#sec:command_line_warnings
158 actionable tasks: 22 executed, 136 up-to-date
D:\test\app-prd2 (1)\app-prd2 (1)\app\node_modules\jpush-react-native\android\src\main\java\cn\jiguang\plugins\push\JPushModule.java:387: ����: �Ҳ�������
            JSONObject notificationExtraJson = new JSONObject(notificationExtra.toHashMap());
                                                                               ^
  ����:   ���� toHashMap()
  λ��: ����ΪReadableMap�ı��� notificationExtra
D:\test\app-prd2 (1)\app-prd2 (1)\app\node_modules\jpush-react-native\android\src\main\java\cn\jiguang\plugins\push\JPushPackage.java:13: ����: JPushPackage���dz����, ����δ����ReactPackage�еij���createJSModules()
public class JPushPackage implements ReactPackage {
       ^
2 ������

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':jpush-react-native:compileDebugJavaWithJavac'.
> Compilation failed; see the compiler error output for details.

Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 1m 17s

error Failed to install the app. Make sure you have the Android development environment set up: https://reactnative.dev/docs/environment-setup. Run CLI with --verbose flag for more details.
D:\test\app-prd2 (1)\app-prd2 (1)\app\node_modules\jpush-react-native\android\src\main\java\cn\jiguang\plugins\push\JPushModule.java:387: ����: �Ҳ�������

出现乱码不用管，一开始觉得是gradle下不下来，就去修改了gradle-wrapper.properties的distributionUrl，改成本地的gradle，结果还是可住一个多小时，卡后报一样的错误。如果有人因为gradle下不下来，可以移步到这个博客:

https://blog.csdn.net/lbb17745169396/article/details/79064394?utm_medium=distribute.pc_relevant.none-task-blog-baidujs_title-0&spm=1001.2101.3001.4242

由于运行卡在：

Resolve dependencies of :app:debugRuntimeClasspath > maven-metadata.xml

想着可能是因为下载依赖的时候，配置的是国外的远程仓库，所以下不下来，所以就去build.gradle文件修改的mavenURL，由于不知道是哪个mavenURL连不上，所以我就把四个URL都改成了阿里的镜像：

maven { url "https://maven.aliyun.com/repository/google"}
maven { url "https://maven.aliyun.com/repository/public" }
maven { url "https://maven.aliyun.com/repository/jcenter" }
maven { url "https://maven.aliyun.com/repository/gradle-plugin" }

配置好之后运行，这次没有卡了，又报了一个错,错误如下：

> Task :app:validateSigningDebug FAILED

Deprecated Gradle features were used in this build, making it incompatible with Gradle 7.0.
Use '--warning-mode all' to show the individual deprecation warnings.
See https://docs.gradle.org/6.2/userguide/command_line_interface.html#sec:command_line_warnings
383 actionable tasks: 2 executed, 381 up-to-date

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:validateSigningDebug'.
> Keystore file 'D:\test\app-prd2 (1)\app-prd2 (1)\app\android\app\hglife.keystore' not found for signing config 'debug'.
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 22s

这次报错原因倒是简单，看“* What went wrong: ”下面的提示：

Keystore file 'D:\test\app-prd2 (1)\app-prd2 (1)\app\android\app\hglife.keystore' not found for signing config 'debug'.

就是说我的android\app目录下没有hglife.keystore文件，这个文件是Android平台签名证书，要么禁用，要么问公司要一个或者生成（一般的项目hglife.keystore都是自定义的，生成无法直接使用），禁用移步百度。要到文件直接，react-native run-Android后项目就运行起来了。

后面自己也总结，特别是运行卡住哪里，我把报原来的mavenURL注释关掉，然后逐一注释四个URL。

   maven {
           // All of React Native (JS, Obj-C sources, Android binaries) is installed from npm
           url("$rootDir/../node_modules/react-native/android")
       }
       maven {
           // Android JSC is installed from npm
           url("$rootDir/../node_modules/jsc-android/dist")
       }
//        // ADD THIS
//原配置
       maven { url 'https://www.jitpack.io' }
       maven { url 'https://maven.google.com' }

等到我把 maven { url 'https://maven.google.com' }这个URL注释掉，其他三个都打开，项目运行没有卡掉，而是运行报错，我就明白的，是 maven { url 'https://maven.google.com' }这个URL无法连接，把这个换成阿里的镜像地址之后，项目运行的时候没有卡了。

结语：

项目重导运行报错，错误原因主要有：

1. 运行环境不支持（jkd，sdk等）
2. 无法下载配置（科学上网或者使用国内镜像）
3. 缺少文件（有些文件证书或者加密文件只有在项目上线才提供，提交到仓库文件会被忽略而导致无法运行）