JDK-6656031 : SA: jmap -permstat number of classes is off by 1
- Type: Bug
- Component: core-svc
- Sub-Component: tools
- Affected Version: 5.0u4,6,8
- Priority: P4
- Status: Resolved
- Resolution: Fixed
- OS: generic
- CPU: generic
- Submitted: 2008-01-28
- Updated: 2018-02-15
- Resolved: 2014-01-30
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Unresolved : Release in which this issue/RFE will be addressed.
Resolved: Release in which this issue/RFE has been resolved.
Fixed : Release in which this issue/RFE has been fixed. The release containing this fix may be available for download as an Early Access Release or a General Availability Release.
To download the current JDK release, click here.
| JDK 8 | JDK 9 |
|---|---|
8u162Fixed  |
9 b04Fixed |
Description
If you load 2 classes with custom classloader, the output of jmap -permstat shows 3 classes for this class loader:
Attaching to process ID 25522, please wait...
Debugger attached successfully.
Client compiler detected.
JVM version is 12.0-b01-fastdebug
586 intern Strings occupying 34032 bytes.
finding class loader instances ..done.
computing per loader stat ..done.
please wait.. computing liveness.................................................done.
class_loader classes bytes parent_loader alive? type
<bootstrap> 317 891720 null live <internal>
0xadb72d18 0 0 null live sun/misc/Launcher$ExtClassLoader@0xb1c97550
0xadb82248 3 3208 0xadb7b320 live java/net/URLClassLoader@0xb1c972a8
0xadb7b320 11 74328 0xadb72d18 live sun/misc/Launcher$AppClassLoader@0xb1ce0610
total = 4 331 969256 N/A alive=4, dead=0 N/A
===
import java.net.*;
import java.io.*;
public class ClassLoading {
public static void main(String[] args) throws Exception {
String dir = new File(".").getCanonicalPath();
URLClassLoader loader = new URLClassLoader(new URL[] { new URL("file://" + dir + "/a.jar") });
Class a = loader.loadClass("A");
Class b = loader.loadClass("B");
Thread.sleep(10000000);
}
}
===
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