Common bugs of Android OkHttp Retrofit RxJava integration

I encountered some inexplicable bugs while using OkHttp Retrofit RxAndroid. as follows:

1. ArrayIndexOutOfBoundsException

   Throwing new exception ‘length=6; index=7’ with unexpected pending exception:java.lang.ArrayIndexOutOfBoundsException: length=6; index=6

   Solution: Many people on the Internet say that you uncheck Instant Run and recompile each time you run it. But this feature was abandoned after Android Studio 3.5.

   I tried this but it didn't solve the problem, and then I found that it was caused by the mismatch between the versions of Retrofit, RxAndroid and adapter-rxjava. RxAndroid is 3.0, and the version used by the original adapter-rxjava is 2.

   The changed dependency is like this

   	// okHttp 3.14
       implementation 'com.squareup.okhttp3:okhttp:3.14.9'
       // Retrofit 2.9
       implementation 'com.squareup.retrofit2:retrofit:2.9.0'
       // Convert Google Json（Convert the result to Model）
       implementation 'com.squareup.retrofit2:converter-gson:2.3.0'
       // Retrofit CallAdapter convert to RxJava
       implementation 'com.squareup.retrofit2:adapter-rxjava3:2.9.0'
       // RxAndroid 3.0
       implementation 'io.reactivex.rxjava3:rxandroid:3.0.0'
   

2. BootstrapMethodError

   java.lang.BootstrapMethodError: Exception from call site #1 bootstrap method…

   Solution: This is because Retrofit uses new features in JDK8, Lamdba, etc., so we need to add support in the app's build.gradle.

   	// Support new features of JDK1.8
       compileOptions {
         
         
           sourceCompatibility JavaVersion.VERSION_1_8
           targetCompatibility JavaVersion.VERSION_1_8
       }
   

   This can be solved.
   The above two issues are not easy to locate, post them and hope that they can be helpful. In short, we still need to be careful.