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A facility to keep a history of context information during runtime and then dumping it in a separate file when a problem occurs (similar to core dump).
JCola is a file tailing application written in Java Swing. This multithreaded application can tail an unlimited amount of logfiles concurrently and simulates "tail -f" with much more functionality.
A simple heap profiler for Java, based on JVMPI. The profiler
can be attached to a non-interactive JVM, creating heap
statistics from time to time. In case of OutOfMemoryExceptions
you simply verify your log file for the number of created
objects and
A small suite of classes designed to examine objects through the Java reflection API. Analysis is package neutral and output can be written to log file or as HTML tables. The project focus is in debugging the state of a servlet or JSP.
araSpect is a server side object inspector for web applications. Through a web interface you can drill down in your server side java beans. It is very easy to install and can be added to a deployed application. There is special support for Struts.
Cricket Cage automatically creates JUnit TestCases for repeatable bugs and test scenarios. Include Cricket Cage's AspectJ code to install a code generator, then run the program to generate the TestCase. Finally, add the test case to your build.xml.
AG101 is a java-based visual XSL editor/debugger built on the Pollo XML editor (pollo.sourceforge.net). It has extensions to a regular expression library. It also has the ability to pipe XSL transforms one to another and store and reuse those pipes.
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xsldb is a fully featured xslt debugger that can easily be linked into every xslt-development environment that uses Apache XALAN or the Sun JDK implementations. xsldb is interactive, console based and offers an intuitive, easy to learn debugging language
ALF, The Automated Logging Framework, is a native logging framework for Java with the unique advantage of supporting automated method tracing. This platform-independent library allows developers to debug their applications quickly without adding code
Orome is a tool for automating System or Acceptance tests (also Unit test though this is not the focus) for web-based systems. Orome takes a set of static HTML pages defining a walkthrough of (part of) the systems and tests it against the running system.
A suite of Java ClassLoaders that use "load-time reflection" (the modification of bytecodes upon class loading) to extend existing Java classes. It uses the excellent BCEL library (http://bcel.sf.net).
Java Console is a Java Command promt tool intended for Software Developers, System Administrators and as a plug in to other applications. It is a very powerful console client just run it and have fun
HUP is a heap-profiling tool that allows the exploration and reduction of heap space consumption in Java applications. The HUP tool allows a programmer to locate and remove memory bottlenecks, which are caused by unused objects.
Allows JDBC resources to be monitored. You can see when java.sql objects are being opened and closed and can see the line of code where a resource that is still open was originally opened.
Jylog is a (JPDA) Java Platform Debugger Architecture based logger, Jylog eliminates the need for writing any log statement in the program. one can define the logging information using Jylog swing GUI and Jylog extracts the information from JVM at runtime
Bean Bowl is the a fun and useful Java lab, allowing you to play around with Java classes and objects using direct manipulation techniques instead of writing long main() methods. Use it either as an application or as a GUI component framework for you own
Java-program to read, modify and execute class-files. a real java VM written in java or a decompiler for class-files is possible (and partially working)
xdProf is a tool that captures and analyzes stack traces sent at a fixed interval from Java Virtual Machines in a distributed system. The xdProf client uses a C/C++ Java Virtual Machine Profiling Interface (JVMPI) library and works on many platforms.
httptrace - TCP/HTTP trace utility (for Java or Win32/jview.exe)
Listens on a TCP/IP port, redirects data to another port and writes traces.
Several options (search for patterns, ...).