retrofit convertor factory can not access GsonConverterFactory

Question

I have included these dependencies to my project:

compile \'com.squareup.retrofit:retrofit:2.0.0-beta2\'
compile \'com.squareup.retrofit:convert

Answer 1

With latest Beta 2.0.3 release you need to add :

compile 'com.squareup.retrofit2:retrofit:2.0.0-beta3'
compile 'com.squareup.retrofit2:converter-gson:2.0.0-beta3'

Make sure to match the retrofit library version with gson converter version.

Answer 2

Try to use same version for retrofit and converter-gson - 2.0.0-beta2. You are using beta2 for retrofit and beta1 for converter.

implementation 'com.squareup.retrofit:retrofit:2.0.0-beta2'
implementation 'com.squareup.retrofit:converter-gson:2.0.0-beta2'

Important note!

Retrofit change its package name since 2.0.0-beta3 version. Now you should use com.squareup.retrofit2. Here is example:

implementation 'com.squareup.retrofit2:retrofit:2.2.0'
implementation 'com.squareup.retrofit2:converter-gson:2.2.0'

Answer 3

  error: method addConverterFactory in class Builder cannot be applied to given types;
    required: Factory
    found: GsonConverterFactory
    reason: actual argument GsonConverterFactory cannot be converted to Factory by method invocation conversion

If you are getting this error, The reason is wrong dependancy included.

Add/ change dependency in application build.gradle file as

compile 'com.squareup.retrofit:retrofit:2.0.0-beta2'  
compile 'com.squareup.retrofit:converter-gson:2.0.0-beta2'

make sure that converter version is 2.0.0-beta2 not 2.0.0-beta1.

Answer 4

In build.gradle (app) instead of:

implementation 'com.google.code.gson:gson:2.8.2'

write:

implementation 'com.squareup.retrofit2:converter-gson:2.3.0'

Answer 5

This is the latest:

compile 'com.squareup.retrofit2:retrofit:2.0.0'
compile 'com.squareup.retrofit2:converter-gson:2.0.0'
compile 'com.squareup.retrofit2:adapter-rxjava:2.0.0'

If you use beta version:

compile 'com.squareup.retrofit:retrofit:2.0.0-beta2'
compile 'com.squareup.retrofit:converter-gson:2.0.0-beta2'
compile 'com.squareup.retrofit:adapter-rxjava:2.0.0-beta2'