Common Properties Of Monitor Views

## Common Properties Of Monitor Views |

| Monitor views show a table where every row corresponds to a waiting or blocking event on a monitor. There are two monitor views: current monitors view The current monitors view shows monitors that are currently involved in a waiting or blocking operation. monitor history view The monitor history view shows the sequence of waiting and blocking operations on monitors.

| The monitor views show the following 6 columns: sortable. Time The start time of the event. Duration The duration of the event. The event may still be in progress. Type The type of the event, one of "waiting" or "blocked". Monitor ID The ID of the monitor for identifying multiple events on a particular monitor instance. Monitor class The class of the monitor. If no Java object is associated with this monitor `[raw monitor]` is displayed. Waiting thread The thread that is or was waiting during the event. Owning thread The thread holding the monitor which is blocking the waiting thread is displayed. The owning thread is only relevant for the "blocked" event type. This column is not available if you profile with Java <=1.4 (JVMPI).

| In the lower part of the split pane, the stack traces of the waiting thread and - if applicable - of the owning thread are displayed. Stack traces can only be displayed if CPU data is being recorded.

| You can show any monitor in the heap walker by selecting the table row and choosing Show Selection In Heap Walker from the context menu. If a heap dump was already taken, you can choose to select the object in the current heap dump, otherwise a new heap dump will be taken. Note that the selected monitor might not exist in the heap dump because the heap dump might have been taken before the monitor was allocated or after the monitor was garbage collected.

| If you profile with Java <=1.4 (JVMPI), the monitor class names can only be displayed if they are recorded objects. You can enable "Record allocations on startup" in the session startup dialog to record all objects.