Why Am I Getting a \"Expected BEGIN_ARRAY but was BEGIN_OBJECT\" Error When Parsing JSON in Java?

JSON Parsing Error: "Expected BEGIN_ARRAY but was BEGIN_OBJECT"

In Java, you're encountering the error "Expected BEGIN_ARRAY but was BEGIN_OBJECT" due to a mismatch between the expected and actual JSON structure while parsing using Gson.

JSON Structure

The provided JSON response from the server is not an array but a single object:

<code class="json">{
  "dstOffset" : 3600,
  "rawOffset" : 36000,
  "status" : "OK",
  "timeZoneId" : "Australia/Hobart",
  "timeZoneName" : "Australian Eastern Daylight Time"
}</code>

Gson Parsing Code

However, in your code, you're incorrectly assuming that the JSON response is an array of Post objects:

<code class="java">List<Post> postsList = Arrays.asList(gson.fromJson(reader, Post[].class));</code>

Gson is expecting an array, so it throws the error when it encounters the BEGIN_OBJECT character in the JSON response.

Solution

To resolve the error, modify your code to expect a single Post object:

<code class="java">Post post = gson.fromJson(reader, Post.class);</code>

This change will align with the actual JSON structure and eliminate the parsing error.

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