This package contains Java utility classes covering diverse programming areas, including: specialized and primitive collections, networking, stream-based I/O, class and resource loading, JAR files and resources, concurrent processing, distributed processing, security, XML parsing, handling configuration files, Swing GUI, memory management, and garbage collection integration. Details can be found in the Features page. Some of these classes are relatively simple, whereas some are substantial; some introduce new APIs and functionality while others workaround problems found in standard Java APIs.
Quite an old article on JavaWorld: "As part of the Java language, the java.lang package is implicitly imported into every Java program. This package's pitfalls surface often, affecting most programmers. This month, I'll discuss the traps lurking in the Runtime.exec() method."
NativeCall is a Java toolkit that lets you call native methods from Java without JNI code. The current version 0.4.1 supports structs, Strings, primitive types (int and boolean), byte and char arrays and output parameters. NativeCall is implemented for the Windows platform.