Hi Yasumasa, On 5/08/2016 9:59 PM, Yasumasa Suenaga wrote:
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@9-ea/ObjectReader.java:217) at sun.jvm.hotspot.utilities.ObjectReader.readInstance(jdk.hotspot.agent@9-ea/ObjectReader.java:247) at sun.jvm.hotspot.utilities.ObjectReader.readObject(jdk.hotspot.agent@9-ea/ObjectReader.java:105) at sun.jvm.hotspot.runtime.VM$2.doOop(jdk.hotspot.agent@9-ea/VM.java:940) at sun.jvm.hotspot.oops.InstanceKlass.visitField(jdk.hotspot.agent@9-ea/InstanceKlass.java:872) at sun.jvm.hotspot.oops.InstanceKlass.iterateStaticFieldsInternal(jdk.hotspot.agent@9-ea/InstanceKlass.java:572) at sun.jvm.hotspot.oops.InstanceKlass.iterateStaticFields(jdk.hotspot.agent@9-ea/InstanceKlass.java:560) at sun.jvm.hotspot.runtime.VM.readSystemProperties(jdk.hotspot.agent@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 not very familiar with how SA operates here so this could be a stupid question, but why do we need to know exactly how Properties are implemented instead of just using the public API to access them and read/write them ??
Thanks, David
I'm jdk 9 commiter, but I cannot access JPRT. So I need a sponsor. Thanks, Yasumasa
