NetBeans Profiler is a project to provide a full-featured profiling functionality for the NetBeans IDE. The profiling functions include CPU, memory and threads profiling as well as basic JVM monitoring, allowing developers to be more productive in solving memory or performance-related issues. The basis of NetBeans Profiler is the JFluid profiling technology, a project that has been originally developed in Sun Laboratories. JFluid uses dynamic bytecode instrumentation to allow for profiling with a dramatically lower overhead, giving the ability to obtain results in situations where the use of other profilers becomes unpractical or impossible. The aim of this project is to provide a powerful and flexible profiling solution that is tightly integrated into the IDE workflow. As the size and complexity of Java applications grow, keeping their performance at the required level becomes progressively difficult.

AppStats is a lightweight, open source framework developed and used by Grand Central Communications, Inc. to capture, analyze, and publicize health, performance, and monitoring statistics for Java applications. P6Spy - P6Spy is an open source framework for applications that intercept and optionally modify database statements. P6Log intercepts and logs the database statements of any application that uses JDBC. P6Outage detects long-running statements that may be indicative of a database outage proble and will log any statement that surpasses the configurable time boundary during its execution. P6Outage was designed to minimize any logging performance penalty by logging only long running statements.

JMemProf is a live Java memory profiler suitable for deployment in web containers such as JBoss, Tomcat and others. JMemProf allows you to retrieve memory profile information while your application is running. JMemProf aims to add dynamic visibility to memory usage in Java web applications; memory profile information can be viewed easily through a Servlet based web interface while the application is running. It is much more dynamic and easily understandable than that of the hprof heap profiler bundled with the J2SDK.

JMP is a profiler for java that can be used to trace objects usage and method timings. JMP uses the JVMPI interface to gather statistics and interact with the JVM. JMP uses a GTK+ interface to show the status. Extensible Java Profiler - Extensible Java Profiler (EJP) is a profiling tool for Java with a scalable and extensible architecture, allowing its usage for exotic programming languages that use a Java backend. EJP is based on the Java Virtual Machine Profiler Interface (JVMPI). It can be used to trace the execution of small parts of Java programs and display it in hierarchical trees with some elements hidden or highlighted.

This is a plugin for the Eclipse platform which allows java code profiling.

The Heap Analysis Tool (HAT) helps to debug unnecessary object retention (sometimes called "memory leaks") by providing a convenient means to browse the object topology in a heap snapshot, which is generated by the Java VM. HAT reads a hprof file, then sets itself up as a web server--therefore allowing you to run queries against a heap dump contained within the hprof file.

JVMPI based visualization using a TreeMap.

A zero-overhead JVMPI plugin for finding first indications of memory leaks in production environments. Where commercial tools kill the performance of your application by collecting uninteresting performance data (such as 'who allocated this object'), this plugin stays inactive during runtime and simply dumps a very simple image of the Java heap on request.

The AdaptJ Agent allows to collect event trace data from a Java program running in a Java Virtual Machine. The AdaptJ Analysis Tool allows to read and analyze the traces generated by the agent, using either the built-in analyses or custom ones.

jMechanic is an Eclipse Java IDE plugin providing Java Profiling tools. Tools such as CPU Sampling and Heap Summary allow the Java developer to tune up the performance of their Java programs all within the comfort of the Eclipse IDE.

The Cougaar memory profiler is a tool for debugging memory usage and leaks in any Java application. It features a scalable 100% Java design that is lighter weight than existing JVMPI-based profilers. The profiler tracks memory usage within the application by using tables of WeakReferences.

This is a GUI client tool that provides access to the HotSwap functionality. Using this tool, you can dramatically improve the time of the usual "test - find a bug - stop the program - change - recompile - restart the program" development cycle by removing the "stop" and "restart" elements from it. Furthermore, you can use it to patch "on-the-fly" deployed applications that need to run uninterrupted.

FProfiler is a Java Profiler using BCEL and log4j. Its very fast because it inserts the needed instructions into the Bytecode of the classes. It can be used to find Hotspots in Java programs, libs and servlet environments simply every Java class.

Extsnible Program Trace Encoding. STEP providins a standard method for encoding general program trace data in a flexible and compact format. The system consists of a trace data definition language along with a compiler for the language and an encoding architecture that implements a number of common trace reduction techniques. The system simplifies the development and interoperability of trace clients by encapsulating the encoding process and presenting the data as an abstract object stream.

The Glassbox Inspector project combines AspectJ and JMX for a flexible, modular approach to monitoring performance for enterprise systems. It provides correlated information to allow you to identify specific problems, but with low enough overhead to be used in production environments. It lets you capture statistics such as total counts, total time, and worst-case performance for requests, and will also let let you drill down into that information for database calls within a request.

InfraRED is a tool for monitoring performance of a J2EE application and diagnosing performance problems. It collects metrics about various aspects of an application’s performance and makes it available for quantitative analysis of the application. InfraRED uses AOP to weave the performance monitoring code into the application.

JIP is a code profiling tool much like the hprof tool that ships with the JDK. JIP allows you to turn the profiler on and off while the JVM is running. JIP is pure Java. It takes advantage of the Java5™ feature which allows you to hook the classloader. When the profiler is turned off, there is almost no overhead associated with using JIP. JIP allows real world timings for every class in your code.