RFR: 8259008: ArithmeticException was thrown at "Monitor Cache Dump" on HSDB [v2]

[Yasumasa Suenaga]

> I saw the exception as following when I chose "Monitor Cache Dump" menu on HSDB:
> 
> Exception in thread "AWT-EventQueue-0" java.lang.ExceptionInInitializerError
>         at jdk.hotspot.agent/sun.jvm.hotspot.ui.MonitorCacheDumpPanel.dumpOn(MonitorCacheDumpPanel.java:92)
>         at jdk.hotspot.agent/sun.jvm.hotspot.ui.MonitorCacheDumpPanel.<init>(MonitorCacheDumpPanel.java:59)
>         at jdk.hotspot.agent/sun.jvm.hotspot.HSDB.showMonitorCacheDumpPanel(HSDB.java:1556)
>         at jdk.hotspot.agent/sun.jvm.hotspot.HSDB$16.actionPerformed(HSDB.java:338)
>         at java.desktop/javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1972)
>         at java.desktop/javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2313)
>         at java.desktop/javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:405)
>         at java.desktop/javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:262)
>         at java.desktop/javax.swing.AbstractButton.doClick(AbstractButton.java:374)
>         at java.desktop/javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1022)
>         at java.desktop/javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:1066)
>         at java.desktop/java.awt.Component.processMouseEvent(Component.java:6617)
>         at java.desktop/javax.swing.JComponent.processMouseEvent(JComponent.java:3342)
>         at java.desktop/java.awt.Component.processEvent(Component.java:6382)
>         at java.desktop/java.awt.Container.processEvent(Container.java:2264)
>         at java.desktop/java.awt.Component.dispatchEventImpl(Component.java:4993)
>         at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2322)
>         at java.desktop/java.awt.Component.dispatchEvent(Component.java:4825)
>         at java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4934)
>         at java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Container.java:4563)
>         at java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Container.java:4504)
>         at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2308)
>         at java.desktop/java.awt.Window.dispatchEventImpl(Window.java:2773)
>         at java.desktop/java.awt.Component.dispatchEvent(Component.java:4825)
>         at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:772)
>         at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
>         at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715)
>         at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
>         at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
>         at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:95)
>         at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:745)
>         at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:743)
>         at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
>         at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
>         at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:742)
>         at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
>         at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
>         at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
>         at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
>         at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
>         at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
> Caused by: java.lang.ArithmeticException: / by zero
>         at jdk.hotspot.agent/sun.jvm.hotspot.runtime.ObjectSynchronizer.initialize(ObjectSynchronizer.java:55)
>         at jdk.hotspot.agent/sun.jvm.hotspot.runtime.ObjectSynchronizer$1.update(ObjectSynchronizer.java:40)
>         at jdk.hotspot.agent/sun.jvm.hotspot.runtime.VM.registerVMInitializedObserver(VM.java:578)
>         at jdk.hotspot.agent/sun.jvm.hotspot.runtime.ObjectSynchronizer.<clinit>(ObjectSynchronizer.java:38)
>         ... 41 more
> 
> This exception seems to be caused by [JDK-8253064](https://bugs.openjdk.java.net/browse/JDK-8253064). It has changed `ObjectSynchronizer`, but it has not changed SA code.

Yasumasa Suenaga has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains three commits:

 - Fix comments
 - Merge
 - 8259008: ArithmeticException was thrown at "Monitor Cache Dump" on HSDB

-------------

Changes: https://git.openjdk.java.net/jdk/pull/1910/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1910&range=01
  Stats: 183 lines in 5 files changed: 129 ins; 38 del; 16 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1910.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1910/head:pull/1910

PR: https://git.openjdk.java.net/jdk/pull/1910