Hier gibt es einige Stücke Software, die ich - teilweise alleine, teilweise zusammen mit Anderen - geschrieben habe und kostenlos zum Downlaod anbiete. Im Gegenzug übernehme ich naheliegender Weise keinerlei Gewährleistung für sie.

The AHC library is a collection of utility classes that emerged over time and have proved useful in different contexts. Some of the classes are useful by themselves, others form little sub-libraries.

The following list contains some of the features:

• generic toString: The library contains a highly configurable yet simple to use class that uses reflection to create a string representation of arbitrary object graphs.
• collections: The library contains a rather more powerful set of collection classes than the JDK library - and is 100% backward interface compatible! There are sets, lists, maps, multisets, multimaps, queues, and stacks. The underlying storage algorithm (array, linked list, hashed, ...) is configurable, as well as the sorting behaviour and the comparison operation (equals, identity, ...). Introducing reified algorithms is planned for a future release.
• Logging JDBC driver: The library contains a JDBC driver that acts as a wrapper around an arbitrary other JDBC driver and logs every method that is called on the JDBC driver. Highly useful for understanding strange behaviour and identifying bugs in big persistence frameworks or JDBC drivers.
• Object graph navigation: The library contains a small set of classes that allow generic navigation on an object graph ("o.getThis().getThat().getName()"). There are several implementations for this, one of them using a custom classloader that generates bytecode at runtime, boosting performance by a factor of 10 compared to optimized reflection.
• A lot of useful classes, e.g. DateDay to represent a date (as opposed to a timestamp, which is what java.util.Date is).

JAnalyze is a tool for analyzing Java projects. It reads in class files and then helps to give an overview of structure and dependencies at the package, class and method level; it also provides a number of metrics for methods, classes and packages.

One of the main features is the detection of static dependency cycles for classes and packages.

The tool features extraordinary performance which allows using it interactively; on a P-III/850, reading in a project of several thousand classes with all libraries it uses takes about 45 seconds if the classes are not in the operating system cache (otherwise about 15 seconds), and detecting cycles usually takes no noticable time.

SafeJdbc ist ein Framework, das JDBC kapselt und eine echte objekt-orientierte Schnittstelle zur Datenbank zur Verfügung stellt. Ressourcenlecks werden dadurch vermieden, dass alle Datenbankoperationen in Callbacks ausgeführt werden. (zip)
Dieses Framework haben Jan Hermanns und ich zusammen entwickelt.

JWhich ist ein kleines Programm, das den Classpath nach einer Klasse durchsucht und alle Einträge im Classpath ausgibt, die die Klasse enthalten. (zip)