Extra content after end of an array is ignored

[marekkrk]

Describe the bug
Extra content after a square bracket that ends an array is ignored. Example:
[]abc

Version information
2.15.2

To Reproduce
Run the following code:

import com.fasterxml.jackson.databind.ObjectMapper;

public class ParseArray {

public static void main(String[] args) throws Exception {
    var mapper = new ObjectMapper();
    var obj = mapper.readValue("[]abc", Object.class);
    System.out.println(obj);
}

}

Expected behavior
A parse exception is thrown.

Additional context
No exception, an empty list is printed to standard out.

[marekkrk]

This also applies to curly brackets. Example:
{}y

[JooHyukKim]

@marekkrk thank you for reporting! 🙏🏼 I think either this should not be allowed, or at least have configuration to enable/disable.

One question though. does your stated Expected behahior come from previous Jackson version, or out of convention? For example like this wasn't the case in Jackson 2.14.0.

[yawkat]

this is intended, you can enable FAIL_ON_TRAILING_TOKENS if you want

[marekkrk]

this is intended, you can enable FAIL_ON_TRAILING_TOKENS if you want

Thanks, this solves the problem. But why is this not enabled by default?

[yawkat]

see #3406 and the linked discussion