Problem Description : The following 5 java/lang/management test cases fail due to compilation error

Tested_Java_Release : 1.6.0
Tested_Build : 1.6.0-beta-b59d
Operating System : ALL
Machine Name : wowamd
Test suite : MM_REGRESSION
Test cases :
    XXX/java/lang/management/ManagementFactory/ThreadMXBeanProxy.java
    XXX/java/lang/management/ThreadMXBean/FindMonitorDeadlock.java
    XXX/java/lang/management/ThreadMXBean/LockedMonitors.java
    XXX/java/lang/management/ThreadMXBean/LockedSynchronizers.java
    XXX/java/lang/management/ThreadMXBean/MyOwnSynchronizer.java

Results : http://vmsqe.sfbay/weekly/mustang/results/1.6.0-beta-b59d/ServerVM/64BITRHAS4.0AMD/mixed/VM4/MM_REGRESSION-WEEKLYmtg-VM4-ServerVM-mixed-64BITRHAS4.0AMD-2006-01-13-20-46-40/analysis_new.html#New_Failures


Error : /net/vmsqe.sfbay/export/backup/UNIFIED-DTF/DTWS/suites/MM_REGRESSION/testbase/test/java/lang/management/ManagementFactory/ThreadMXBeanProxy.java:137: cannot find symbol
symbol : method getLockedSynchronizers()
location: class java.lang.management.ThreadInfo
            LockInfo[] syncs = info.getLockedSynchronizers();
                                   ^
5 errors
result: Failed. Compilation failed


test result: Failed. Compilation failed