how to solve “Expected BEGIN_ARRAY but was STRING at line 1 column 1 path $ ” [closed]

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Closed 2 years ago.

I'm facing problem when I run the app on my mobile and when I run the error with stack trace or with debug option there is no error so I don't know what to do Here's the error message

Error:Execution failed for task ':app:transformClassesWithInstantRunForDebug'.

java.lang.IllegalStateException: Expected BEGIN_ARRAY but was STRING at line 1 column 1 path` $

回答1:

This usually happens when your model is expecting a JSON array value but was surprised by a String value so it threw an exception. You can solve this in two different ways:

1- Edit your API response to return an empty JSON array or a JSON array with only one value in it. I mean always wrap your response value in a JSON array.

2- Edit your model to accept all data types, you can use Object as the data type for this value then cast it to an array or to a single value only.

Hope this helps, happy coding!

来源：https://stackoverflow.com/questions/47884928/how-to-solve-expected-begin-array-but-was-string-at-line-1-column-1-path