Andrew Wilcox has released JIP 1.0.4, an interactive open source profiler for Java. Surprisingly JIP is not based on the JVMPI. According to Wilcox, "Most profilers have some native component. This is because most profilers use the JVMPI (Java Virtual Machine Profiling Interface) which requires the use of native components. JIP, however, is pure Java. It takes advantage of the Java5™ feature which allows you to hook the classloader. JIP adds aspects to every method of every class that you want to profile. These aspects allow it to capture performance data."
