已解决(class file version 53.0), this version of the Java Runtime only recognizes class file

Posted 2021-05-17 up up!

运行testngxml文件报错

org.openqa.selenium.SessionNotCreatedException: Unable to create a new remote session. Please check the server log for more details. Original error: An unknown server-side error occurred while processing the command. Original error: Cannot verify the signature of ‘/Applications/Appium.app/Contents/Resources/app/node_modules/appium/node_modules/appium-uiautomator2-server/apks/appium-uiautomator2-server-v4.17.4.apk’. Original error: Error: A JNI error has occurred, please check your installation and try again
Exception in thread “main” java.lang.UnsupportedClassVersionError: com/android/apksigner/ApkSignerTool has been compiled by a more recent version of the Java Runtime (class file version 53.0), this version of the Java Runtime only recognizes class file versions up to 52.0

排查步骤：

1. 查看本机安装的jdk是否有多个
2. 检查环境版本是否一致（java -version、javac -version）
3. 检查编译器设置的jdk和jre是否和环境变量一致
4. Android SDK Build-tools版本过高(我卸载30，重新安装了26的，再重启appium就可以了)