RFR: JDK-8163272: jhsdb jinfo cannot show system properties

[Yasumasa Suenaga]

Hi all,

I tried to get system properties via "jhsdb jinfo".
However, it did not work as below:

----------------
$ /usr/local/jdk-9/bin/jhsdb jinfo --pid 1002
Attaching to process ID 1002, please wait...
Debugger attached successfully.
Server compiler detected.
JVM version is 9-ea+129
Java System Properties:

java.lang.NullPointerException
         at sun.jvm.hotspot.utilities.ObjectReader.getHashtable(jdk.hotspot.agent at 9-ea/ObjectReader.java:217)
         at sun.jvm.hotspot.utilities.ObjectReader.readInstance(jdk.hotspot.agent at 9-ea/ObjectReader.java:247)
         at sun.jvm.hotspot.utilities.ObjectReader.readObject(jdk.hotspot.agent at 9-ea/ObjectReader.java:105)
         at sun.jvm.hotspot.runtime.VM$2.doOop(jdk.hotspot.agent at 9-ea/VM.java:940)
         at sun.jvm.hotspot.oops.InstanceKlass.visitField(jdk.hotspot.agent at 9-ea/InstanceKlass.java:872)
         at sun.jvm.hotspot.oops.InstanceKlass.iterateStaticFieldsInternal(jdk.hotspot.agent at 9-ea/InstanceKlass.java:572)
         at sun.jvm.hotspot.oops.InstanceKlass.iterateStaticFields(jdk.hotspot.agent at 9-ea/InstanceKlass.java:560)
         at sun.jvm.hotspot.runtime.VM.readSystemProperties(jdk.hotspot.agent at 9-ea/VM.java:935)
                :
System Properties info not available!
----------------
* If you want to see all stack, please see JBS.


I think this is caused by JDK-8029891.
JDK-8029891 changes that j.u.Properties stores properties to j.u.c.ConcurrentHashMap.
ObjectReader should be adapted to this change.

I uploaded webrev. Could you review it?

   http://cr.openjdk.java.net/~ysuenaga/JDK-8163272/webrev.00/

I'm jdk 9 commiter, but I cannot access JPRT.
So I need a sponsor.


Thanks,

Yasumasa