请从stacktrace解释“ java frame”的含义吗？

Question

In dump I see following information:

Java frames: (J=compiled Java code, j=interpreted, Vv=VM code)
j  com.barcap.fox.log.Syslog.plog(ILjava/lang/String;)Z+0
j  com.barcap.fox.log.Syslog.log(ILjava/lang/String;)Z+317
j  com.barcap.fox.log.Syslog$BS.flush()V+37
j  java.io.PrintStream.write([BII)V+30
....

Can you explain meaning of Java frame

I tryied to google it but I see only results related with swing(Jframe).

Answer 1

In other languages this would be called a "stack frame", but the Java Virtual Machine Specification uses just the term "frame". It is the segment of the call stack devoted to one invocation of a method, where that method keeps its state (local variables, parameters, etc.).

Answer 2

A frame is essentially the space devoted to a function on a stack.

Picture from here.

The "Java frame" means that the frame is for Java code. There are these kinds of frames:

Native C frame (C), Interpreted Java frame (j), VM frame (V), VM generated stub frame (v), Other frame types, including compiled Java frames (J)

See this.