Why am I getting a \"JSON Syntax Error: Expected BEGIN_ARRAY But Was BEGIN_OBJECT\" error when parsing JSON data?

JSON Syntax Error: Expected BEGIN_ARRAY But Was BEGIN_OBJECT

The JSON parser is encountering an error when parsing JSON data, indicating a mismatch between the expected and actual structure.

Problem:

The error message "Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 2" implies that the parser was expecting an array structure (BEGIN_ARRAY) in the JSON data, but instead it encountered an object structure (BEGIN_OBJECT). This mismatch can cause the parser to fail and raise an exception.

Server URL and Request:

The provided code snippet performs an HTTP POST request to a URL and retrieves its response. The URL is configured to retrieve JSON data from a remote server.

Post Class:

The Post class defines the structure of each object within the expected array of data. However, as indicated by the error message, the server is not returning an array of objects but rather a single object.

Solution:

The code expects an array of Post objects but receives a single object. To resolve this issue, modify the code to interpret the response as a single Post object instead of an array:

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

By replacing

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

with the above line, the code correctly interprets the JSON response as a single Post object, resolving the "Expected BEGIN_ARRAY but was BEGIN_OBJECT" error.

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