When using the Memory Leak Detector, nothing happens in the growth column of the trend table. Why?

The trend analysis needs at least three data points to start, and the data is collected as part of the old space garbage collection. If you see no data, the JVM has probably not performed enough garbage collections yet. To speed up the process, try clicking the garbage can in the tool bar of the Memory Leak Detector to force three successive garbage collections, with a brief pause in between each garbage collection.