JsonReader is not thread safe

[NLxAROSA]

The code below parellizes the processing across the number of supplied keys. But StringBuilder is not thread-safe. Causes random ArrayIndexOutOfBoundsExceptions in reactive/multi-threaded environments.

spring-ai/spring-ai-core/src/main/java/org/springframework/ai/reader/JsonReader.java

Lines 95 to 99 in 5a35213

	StringBuilder sb = new StringBuilder();
	jsonKeysToUse.parallelStream().filter(item::containsKey).forEach(key -> {
	sb.append(key).append(": ").append(item.get(key)).append(System.lineSeparator());
	});

Most notable with large collections of JSON documents and keys and in reactive environments.

[tzolov]

Thanks @NLxAROSA , just caught the same issue.
The fix is coming shortly.