okhttp异常处理

在使用OKhttp，创建OkHttpClient请求网络时，会抛出异常

java.lang.BootstrapMethodError: Exception from call site #5 bootstrap method
    at okhttp3.internal.Util.(Util.java:87)
    at okhttp3.internal.Util.immutableList(Util.java:234)
    at okhttp3.OkHttpClient.(OkHttpClient.java:127)
    at com.amazonaws.transcribestreaminghttpclient.MainActivity.(MainActivity.java:28)
    at java.lang.Class.newInstance(Native Method)
    at android.app.AppComponentFactory.instantiateActivity(AppComponentFactory.java:69)
    at android.support.v4.app.CoreComponentFactory.instantiateActivity(CoreComponentFactory.java:43)
    at android.app.Instrumentation.newActivity(Instrumentation.java:1215)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2831)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048)

对于这中问题处理，JakeWharton大神给出了答案，就是在build.gradle文件里添加

android {
    compileOptions {
        targetCompatibility = "8"
        sourceCompatibility = "8"
    }
}

重新运行就ok了

参考https://github.com/square/okhttp/issues/4597