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  1. JDK
  2. JDK-6656031

SA: jmap -permstat number of classes is off by 1

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    • Subcomponent:
    • Resolved In Build:
      b04
    • CPU:
      generic
    • OS:
      generic

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        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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                • Assignee:
                  jbachorik Jaroslav BachorĂ­k
                  Reporter:
                  nhaustov Nicolay Haustov (Inactive)
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