yuluo-yx opened a new issue, #1760:
URL: https://github.com/apache/rocketmq-dashboard/issues/1760
**BUG REPORT**
1. Please describe the issue you observed:
- What did you do (the steps to reproduce)?
Call `JsonUtil.string2Obj` with a valid pretty-printed JSON document, for
example:
```java
JsonUtil.string2Obj("{\n \"value\": 1\n}", Map.class);
```
The same preprocessing path can be observed by passing a multiline value
with `String.class`.
- What did you expect to see?
Jackson should parse structural JSON whitespace normally, and a requested
String value should be returned without modification.
- What did you see instead?
`JsonUtil` replaces carriage returns and line feeds with literal escape
characters before deserialization. The pretty-printed document becomes invalid
JSON and returns null; multiline String values are silently changed.
2. Please tell us about your environment:
- apache/rocketmq-dashboard master
- baseline commit `770822bbc812bfd0c2a94aa0128ab6f59b50d076`
- JDK 17
3. Other information:
The preprocessing is not needed because Jackson already handles legal JSON
whitespace and escaped newlines. Removing it preserves valid inputs while
continuing to reject non-standard JSON string literals.
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