tailieunhanh - WebSphere Studio Application Developer Version 5 Programming Guide part 72

WebSphere Studio Application Developer part 72 provides integrated development tools for all e-business development roles, including Web developers, Java developers, business analysts, architects, and enterprise programmers. The customizable, targeted, role-based approach of WebSphere Studio Application Developer will be characteristic of all new products built on the WebSphere Studio Workbench. It is well integrated with WebSphere Application Server and provides built-in server test environments that can be used for testing and profiling Web applications | Object references The Object References view shows patterns of references in varying detail both to and from a set of objects if such references exist . To display information this view requires profiling data that contains object reference information. You can use this view to locate objects that still have references to them study data structures and find memory leaks. An example of an Object References view is shown in Figure 20-28. Note To interpret this view you need to have a good understanding of how objects are allocated and referenced in your application and how Java handles object referencing. Figure 20-28 Object References view This view displays the following information Base set of objects Appears in the gray area on the left. Each new object resides in this area once but its instances also reside elsewhere. The view shows references to and from this base set of objects. You can select the base set of objects from the Display field. Objects Represented by squares each colored uniquely by class. Squares come in two forms - A single square denotes a single instance - Twin squares represent multiple instances Class objects Represented by diamonds. 684 WebSphere Studio Application Developer Version 5 Programming Guide References between instances Denoted by black arrows between the instances. An arrow points to the objects being referenced. Arrows point right to left. Repetition of an object Represented by a blue upward-pointing arrow. Click this arrow to display a long blue arrow that leads to another place where the same object is displayed. Old objects Denoted by a red font color for the number of objects and the class name both of which appear to the right of each instance. Note Old objects are those created prior to a certain point during the profiling session. You can specify that point as you create a dump of the object references using the Collect Object References icon in the toolbar. Objects that are created after that point in time are rererred