JsonLogEventParser can not parse json log string with extendedStackTrace about logging-log4j2 HOT 5 CLOSED

You are calling BufferedReader#readLine() twice per loop iteration.

Try:

JsonLogEventParser parser = new JsonLogEventParser();
try (BufferedReader br = new BufferedReader(new FileReader(logFilePath))) {
        String line;
	while ((line = br.readLine()) != null) {
	        // Get LOG Event from line
	        try {
			LogEvent logEvent = parser.parseFrom(line);
                        .....
                }
                catch(Exception x) {
			System.out.print("Error parsing log");
			throw x;
		}
       }
}   
catch(Exception e) {
	System.out.println(e.getStackTrace().toString());
	throw new RuntimeException(e);
}

You are also assuming that each log line has one JSON object, which might be wrong.

BTW: we are considering removing the whole o.a.l.l.core.parser package from log4j-core (cf. this thread on dev@logging).

from logging-log4j2.

Thank you for your answer. Yes you are right regarding reading buffered line twice. But error persists. It's related only to the stacktrace part of json. it works fine if stacktrace is not present.
Anyway, if the parser package will be removed from core, i have to implement my own parser json log.
Thank you for you support.

from logging-log4j2.

If the parser package will be removed from core i can close the issue

from logging-log4j2.

@sanova, I recommend you to indeed roll out your own parser.

Back in the days when JsonLayout was the only JSON-formatted layout, it was possible to provide Jackson-annotated DTOs to parse LogEvents. With the introduction of JsonTemplateLayout, the user is given full control over the JSON structure, hence it is not possible to provide a parser, since the structure is not known to Log4j.

@sanova, if I may ask, what is your use case? Why do you need to parse logs back into Log4j LogEvents? What do you do with it?

from logging-log4j2.

For completeness' sake, the parser didn't disappear, it was moved to samples: log4j-samples-parser.

from logging-log4j2.