tadedon is a set of utilities that form a foundation for applications written with one of the many Java frameworks, such as GWT, GIN, Guice, Google App Engine, commons-configuration, and many others. It lets you specify the default configuration of your application and upgrade it automatically on each new release. It can redirect all java.util.logging to slf4j and easily configure logback. It can bind application configuration in a Guice module. It supports @PostConstruct and @PreDestroy annotations (JSR 250) in Guice applications. It lets you annotate your methods with @Transactional annotation. It supports Guice injector stage in your Web application. It lets you test your Guice managed servlets and filters without needing a real servlet container. It lets you use Guice Matchers for matching super class, interface, and type literal annotations. It can inject event bus to your GWT applications with the help of GIN.
Transmorph is a Java library used to convert a Java object of one type into an object of another type (with another signature, possibly parameterized). It supports conversion for primitives and objects, conversion to multidimensional arrays, conversion to parameterized collections and types, and jars for JDK 1.4 and JDK 1.5. It has no dependencies. It is easy to add more converters. It can convert to a type given either its Java type (class) or signature.
vCard4J is a complete toolkit to manipulate vCards (RFC 2426) in Java. It contains a parser to read vCard files. It also includes a compiler to extend the library. vCard types are defined in a XML file, making it easy to add custom types. It also contains XSLTs to convert the internal DOM structure into vCards 3.0, xHTML, or other formats.