btrace java agent

btrace-java-agent.sh

# -------------- trace script Java source  ---------------- #
import com.sun.btrace.annotations.*;
import static com.sun.btrace.BTraceUtils.*;
import com.sun.btrace.AnyType;

@BTrace // (trusted=true)
public class Test {
        @OnMethod(
                clazz="java.net.ServerSocket",
                method="bind"
                )
        public static void m(AnyType[] args){
        println("port " + str(args[0]));
        jstack();
        }

       public static Object getField(Object self, String fld){
           return get(field(classOf(self), fld), self);
       }
}

# -------- Compile source to .class script ------------ #
bin/btracec Test.java # produced Test.class

# --------- add Application start's cmdline javaagent use btrace-agent.jar ---------- #
java -javaagent:btrace-agent.jar=script=/vol/log/Test.class

# --------- See Log ---------------------------------- #
the log will located in : /vol/log/Test.class.xxxxxx

# eg : Test.class-.default.1587978055966.btrace