An idea related to Location.

[tcmot]

StackTraceElement[] stacks, At runtime, the call is fixed and not modified.

for example:

Examples .java

public class Examples {
  private static Logger logger = LogManager.getLogger(Examples .class);
  public static void main(final String[] args) throws Exception {
     logger.info("info.");// current lineNumber=16
  }
}

sourceClass Examples .class

public class Examples {
  public Examples() {
  }

  private static Logger logger = LogManager.getLogger(Examples .class);
  public static void main(final String[] args) throws Exception {
     logger.info("info.");
  }
}

---

1.Find a way to cache it instead of calling it every time.
Manually add a parameter for the current line number.

logger.info(16,"info.");//lineNumber=16
logger.info(17,"info.");;//lineNumber=17

//Mapping of Line Numbers and Stacks.
private Map<Integer, StackTraceElement[]> stackTraces = new HashMap<>(4800);

// 
StackTraceElement[] stackTraceElements = this.stackTraces.get(lineNumber);
   if (stackTraceElements == null) {
  Throwable t = new Throwable();
   this.stackTraces.put(lineNumber, t.getStackTrace());
  stackTraceElements = this.stackTraces.get(index);
}

---

2.Convert class files using bytecode tools

BytecodeUtil.convert(sourceClass,destClass);

destClass Examples .class

public class Examples {
  public Examples() {
  }

  private static Logger logger = LogManager.getLogger(Examples .class);
  public static void main(final String[] args) throws Exception {
     // Dynamically obtain the class, method, and line number of the logger. info() method in the source Class.
     // 
     logger.log("info.", Examples.class, "main", 16);
  }
}

[rgoers]

Please see https://logging.apache.org/log4j/transform/latest/.

[ppkarwasz]

@tcmot,

We plan to expand the features of Log4j Transformer Plugin later this year. If you have some ideas of features, please submit them to the logging-log4j-transform repository.