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From "Alexey Varlamov (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HARMONY-2037) [drlvm][kernel] Unable to replace system class loader via cmd-line
Date Wed, 01 Nov 2006 13:38:17 GMT
    [ http://issues.apache.org/jira/browse/HARMONY-2037?page=comments#action_12446240 ] 
            
Alexey Varlamov commented on HARMONY-2037:
------------------------------------------

Investigation shows that ExceptionInInitializerError happens:
Exception occured: java/lang/NullPointerException
exit method org/apache/harmony/luni/internal/net/www/protocol/jar/JarURLConnection <clinit>
()V
Stack looks like this:

si_goto_previous to ip = 0134E1FA (<init>(Ljava/lang/ThreadGroup;Ljava/lang/Runnable;Ljava/lang/String;J)V)
si_goto_previous from ip = 0134E1FA (<init>(Ljava/lang/ThreadGroup;Ljava/lang/Runnable;Ljava/lang/String;J)V)
si_goto_previous to ip = 0134DFF9 (<init>(Ljava/lang/Runnable;)V)
si_goto_previous from ip = 0134DFF9 (<init>(Ljava/lang/Runnable;)V)
si_goto_previous to ip = 0134DE3A (closeJars()V)
si_goto_previous from ip = 0134DE3A (closeJars()V)
si_goto_previous to ip = 0134D472 (<clinit>()V)
si_goto_previous from ip = 0134D472 (<clinit>()V)
si_goto_previous to ip = 0057D440 (M2N)
si_goto_previous from ip = 0057D440 (M2N)
si_unwind_from_m2n, ip = 0134D17D
si_goto_previous to ip = 0134D17D (openConnection(Ljava/net/URL;)Ljava/net/URLConnection;)
si_goto_previous from ip = 0134D17D (openConnection(Ljava/net/URL;)Ljava/net/URLConnection;)
si_goto_previous to ip = 0134CFBC (openConnection()Ljava/net/URLConnection;)
si_goto_previous from ip = 0134CFBC (openConnection()Ljava/net/URLConnection;)
si_goto_previous to ip = 0134B1D2 (findClassImpl([Ljava/net/URL;Ljava/lang/String;)Ljava/lang/Class;)
si_goto_previous from ip = 0134B1D2 (findClassImpl([Ljava/net/URL;Ljava/lang/String;)Ljava/lang/Class;)
si_goto_previous to ip = 0134A35C (run()Ljava/lang/Class;)
si_goto_previous from ip = 0134A35C (run()Ljava/lang/Class;)
si_goto_previous to ip = 0134A2A5 (run()Ljava/lang/Object;)
si_goto_previous from ip = 0134A2A5 (run()Ljava/lang/Object;)
si_goto_previous to ip = 012E7211 (doPrivilegedImpl(Ljava/security/PrivilegedAction;Ljava/security/AccessControlContext;)Ljava/lang/Object;)
si_goto_previous from ip = 012E7211 (doPrivilegedImpl(Ljava/security/PrivilegedAction;Ljava/security/AccessControlContext;)Ljava/lang/Object;)
si_goto_previous to ip = 0134A1FF (doPrivileged(Ljava/security/PrivilegedAction;Ljava/security/AccessControlContext;)Ljava/lang/Object;)
si_goto_previous from ip = 0134A1FF (doPrivileged(Ljava/security/PrivilegedAction;Ljava/security/AccessControlContext;)Ljava/lang/Object;)
si_goto_previous to ip = 01349F4B (findClass(Ljava/lang/String;)Ljava/lang/Class;)
si_goto_previous from ip = 01349F4B (findClass(Ljava/lang/String;)Ljava/lang/Class;)
si_goto_previous to ip = 0134989D (loadClass(Ljava/lang/String;Z)Ljava/lang/Class;)
si_goto_previous from ip = 0134989D (loadClass(Ljava/lang/String;Z)Ljava/lang/Class;)
si_goto_previous to ip = 013496F9 (loadClass(Ljava/lang/String;Z)Ljava/lang/Class;)
si_goto_previous from ip = 013496F9 (loadClass(Ljava/lang/String;Z)Ljava/lang/Class;)
si_goto_previous to ip = 0134951E (loadClass(Ljava/lang/String;)Ljava/lang/Class;)
si_goto_previous from ip = 0134951E (loadClass(Ljava/lang/String;)Ljava/lang/Class;)
si_goto_previous to ip = 012EB2F6 (initSystemClassLoader()V)
si_goto_previous from ip = 012EB2F6 (initSystemClassLoader()V)
si_goto_previous to ip = 012EADE3 (getSystemClassLoader()Ljava/lang/ClassLoader;)
si_goto_previous from ip = 012EADE3 (getSystemClassLoader()Ljava/lang/ClassLoader;)
si_goto_previous to ip = 012D73BF (<init>(Ljava/lang/ThreadGroup;Ljava/lang/String;JJIZ)V)
si_goto_previous from ip = 012D73BF (<init>(Ljava/lang/ThreadGroup;Ljava/lang/String;JJIZ)V)


> [drlvm][kernel] Unable to replace system class loader via cmd-line
> ------------------------------------------------------------------
>
>                 Key: HARMONY-2037
>                 URL: http://issues.apache.org/jira/browse/HARMONY-2037
>             Project: Harmony
>          Issue Type: Bug
>          Components: DRLVM
>            Reporter: Alexey Varlamov
>            Priority: Minor
>
> The javadoc for ClassLoader.getSystemClassLoader() states that it should be possible
to replace default system classloader via "java.system.class.loader" property value.
> However this functionality is broken in DRLVM (since HARMONY-1582).
> To reproduce:
> public class CustomSysLoader extends ClassLoader {
>     public static void main(String[] args) {
>         ClassLoader scl = ClassLoader.getSystemClassLoader();
>         System.out.println(scl);
>         if (CustomSysLoader.class == scl.getClass()) {
>             System.out.println("PASSED");
>         } else {
>             System.out.println("FAILED");
>         }
>     }
>     public CustomSysLoader(ClassLoader parent) {
>         super(parent);
>     }
> }
> java -Djava.system.class.loader=CustomSysLoader CustomSysLoader
> HMYEXEL062E Internal VM error: Failed to create Java VM
> FAILED to invoke JVM.

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