142 CHAPTER 5 PERFORMANCE THROUGH THE APPLICATION (Web server certificate)
142 CHAPTER 5 PERFORMANCE THROUGH THE APPLICATION DEVELOPMENT LIFE CYCLE Note The screen shots in this chapter are from Quest Software s JProbe and PerformaSure products. Figure 5-3. The snapshot difference between the heaps, filtered on my application packages Realize that rarely is a loitering object a single simple object; rather, it is typically a subgraph that maintains its own references. In this case, the SystemSnapShot class is a dummy class that holds a set of primitive type arrays with the names timestamp, memoryInfo, jdbcInfo, and threadDumps, but in a real-world scenario these arrays would be objects that reference other objects and so forth. By opening the second heap snapshot and looking at one of the SystemSnapShot instances, you can see all objects that it references. As shown in Figure 5-4, the SystemSnapShot class references four objects: timestamp, memoryInfo, jdbcInfo, and threadDumps. A loitering object, then, has a far greater impact than the object itself. Next, let s look at the referrer tree. We repeatedly ask the following questions: What class is referencing the SystemSnapShot? What class is referencing that class? Eventually, we finally find one of our classes. Figure 5-5 shows that the SystemSnapShot class is referenced by an Object array that is referenced by an ArrayList that is finally referenced by the AdminLoginAction.
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