unable to use jmap utility on Java runtime environment(j2re1.4.2_09)
JDK Version:
------------
bash-2.03$ pwd
/export/updates/jdks/j2sdk1.4.2_09/bin
bash-2.03$ ./java -version
java version "1.4.2_09-ea"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_09-ea-b01)
Java HotSpot(TM) Client VM (build 1.4.2_09-ea-b01, mixed mode)

NoClassDefFoundError throwing when i try to execute jmap command under
bash-2.03$ pwd
/export/updates/jdks/j2re1.4.2_09/bin
bash-2.03$ ./jmap
Exception in thread "main" java.lang.NoClassDefFoundError: sun/jvm/hotspot/tools/JMap

i observed the same behaviour if i try to execute jmap in
<j2sdk-home>/jre/bin
bash-2.03$ pwd
/export/updates/jdks/j2sdk1.4.2_09/jre/bin
bash-2.03$ ./jmap -h
Exception in thread "main" java.lang.NoClassDefFoundError: sun/jvm/hotspot/tools/JMap

bash-2.03$ ./jmap
Exception in thread "main" java.lang.NoClassDefFoundError: sun/jvm/hotspot/tools/JMap

When i execute the jmap command under
<j2se-home>/bin its working fine

bash-2.03$ pwd
/export/updates/jdks/j2sdk1.4.2_09/bin
----------------------------------------------
bash-2.03$ ./jmap -h
Usage: jmap [option] <pid>
                (to connect to a live java process)
   or jmap [option] <executable> <core>
                (to connect to a core file)
   or jmap [option] [server_id@]<remote server IP or hostname
                (to connect to a remote debug server)

where option must be one of:
    <no option> to print same info as Solaris pmap
    -heap to print java heap summary
    -heap:format=b to dump java heap in hprof binary format
    -histo to print histogram of java object heap
    -permstat to print classloader-wise perm gen statistics
    -h | -help to print this help message
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