Throw NoSuchFieldException when call getInt() method #565
Description
Enviroment Infomation
OS
macOS Monterey
Version 12.3.1
java -version
java version "17.0.3" 2022-04-19 LTS
Java(TM) SE Runtime Environment (build 17.0.3+8-LTS-111)
Java HotSpot(TM) 64-Bit Server VM (build 17.0.3+8-LTS-111, mixed mode, sharing)
btrace version
BTrace v.2.2.2 (c8f81cc)
target
public abstract class HelloWorld extends HelloWorldBase {
protected int field = 0;
public static void main(String[] args) throws Exception {
System.out.println(ProcessHandle.current().pid());
System.out.println("ready when you are ...");
System.in.read();
callA();
}
private static void callA() {
System.out.println("HelloWorld#callA");
HelloWorld instance = new HelloWorldExt();
long x = System.nanoTime();
instance.callA("hello", 13);
System.out.println("dur = " + (System.nanoTime() - x));
}
private void callA(String a, int b) {
field++;
callB(callC(a, b));
field--;
}
private void callB(String s) {
field++;
System.out.println("You want " + s);
field--;
}
protected abstract String callC(String a, int b);
}
final class HelloWorldExt extends HelloWorld {
@Override
protected String callC(String a, int b) {
try {
field++;
String s = a + "-" + b;
for (int i = 0; i < 100; i++) {
s = callD(s);
}
return s;
} finally {
field--;
}
}
}
abstract class HelloWorldBase {
protected final String callD(String s) {
return "# " + s;
}
}script content
import org.openjdk.btrace.core.annotations.BTrace;
import org.openjdk.btrace.core.annotations.Kind;
import org.openjdk.btrace.core.annotations.Location;
import org.openjdk.btrace.core.annotations.OnMethod;
import org.openjdk.btrace.core.annotations.ProbeMethodName;
import org.openjdk.btrace.core.annotations.Self;
import static org.openjdk.btrace.core.BTraceUtils.Reflective.getInt;
import static org.openjdk.btrace.core.BTraceUtils.println;
import static org.openjdk.btrace.core.BTraceUtils.str;
@BTrace
public class HelloWorldTrace {
@OnMethod(clazz="HelloWorld", method="/call.*/", type="void (java.lang.String, int)",location=@Location(Kind.ENTRY))
public static void onMethod(@ProbeMethodName(fqn = true) String pmn, @Self Object thiz) {
println("Hello from method " + pmn);
println("field = " + str(getInt("field", thiz)));
}
}command
btrace ${pid} HelloWorldTrace.javawhat happen
Java HotSpot(TM) 64-Bit Server VM warning: Option AllowRedefinitionToAddDeleteMethods was deprecated in version 13.0 and will likely be removed in a future release.
btrace INFO: Attaching BTrace to PID: 69347
btrace INFO: Successfully started BTrace probe: HelloWorldTrace.java
Hello from method private void HelloWorld#callA(java.lang.String, int)
! ERROR
java.lang.RuntimeException: java.lang.NoSuchFieldException: field
at org.openjdk.btrace.core.BTraceUtils.translate(BTraceUtils.java:3124)
at org.openjdk.btrace.core.BTraceUtils.lambda$getField$0(BTraceUtils.java:3044)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:318)
at org.openjdk.btrace.core.BTraceUtils.getField(BTraceUtils.java:3035)
at org.openjdk.btrace.core.BTraceUtils.access$400(BTraceUtils.java:65)
at org.openjdk.btrace.core.BTraceUtils$Reflective.getInt(BTraceUtils.java:5395)
at HelloWorld.callA(HelloWorld.java)
at HelloWorld.callA(HelloWorld.java:16)
at HelloWorld.main(Unknown Source)
Caused by: java.lang.NoSuchFieldException: field
at java.base/java.lang.Class.getDeclaredField(Class.java:2610)
at org.openjdk.btrace.core.BTraceUtils.lambda$getField$0(BTraceUtils.java:3039)
... 7 more
modify script
import org.openjdk.btrace.core.annotations.BTrace;
import org.openjdk.btrace.core.annotations.Kind;
import org.openjdk.btrace.core.annotations.Location;
import org.openjdk.btrace.core.annotations.OnMethod;
import org.openjdk.btrace.core.annotations.ProbeMethodName;
import org.openjdk.btrace.core.annotations.Self;
import java.lang.Class;
import java.lang.reflect.Field;
import static org.openjdk.btrace.core.BTraceUtils.*;
@BTrace
public class HelloWorldTrace {
@OnMethod(clazz = "HelloWorld", method = "callA", type = "void (java.lang.String,int)", location = @Location(Kind.RETURN))
public static void onMethod(@ProbeMethodName(fqn = true) String pmn, @Self Object thiz) {
println("clazz = " + name(classOf(thiz)));
println("Hello from method " + pmn);
}
}Reprint when I modify the script, the clazz print HelloWorldExt. The complete information is as follows
btrace INFO: Attaching BTrace to PID: 21811
btrace INFO: Successfully started BTrace probe: HelloWorldTrace.java
clazz = HelloWorldExt
Hello from method private void HelloWorld#callA(java.lang.String, int)
confused
- I marked clazz on the annotation of onmethod is
HelloWorldbut clazz printHelloWorldExt - Why is NoSuchFieldException thrown