cache4j is a cache for java objects. Simple API and fast implementation.

Cache4j Features

• in memory caching
• design for multithread environment
• two implementation: synchronized, blocking
• eviction algorithm LFU, LRU, FIFO
• for store object can use strong or soft reference
• available under the BSD license

Ehcache is a widely used java distributed cache for general purpose caching, Java EE and light-weight containers.It features memory and disk stores, replicate by copy and invalidate, listeners, cache loaders, cache extensions, cache exception handlers, a gzip caching servlet filter. Ehcache is available under an Apache open source license and is actively developed, maintained and supported.

JBoss Cache is a product designed to cache frequently accessed Java objects in order to dramatically improve the performance of e-business applications. By eliminating unnecessary database access, JBoss Cache decreases network traffic and increases the scalability of applications.

JBoss Cache is much more than a simple cache. JBoss Cache provides fully transactional features as well as a highly configurable set of options to deal with concurrent data access in the most efficient manner possible for your application. In addition, it is a clustered cache that replicates contents to other cache instances running on separate JVMs, servers or even entire networks, making JBoss Cache a highly efficient library used by application server developers to implement clustering features.

JBoss Cache provides two caching APIs to suit your needs. The JBoss Cache API offers a traditional, tree-structured, node-based cache and the Pojo Cache API, which builds on the JBoss Cache API, provides the ability to perform object-based, fine-grained replication of Java objects, resulting in maximum performance benefits.

OSCache is a caching solution that includes a JSP tag library and set of classes to perform fine grained dynamic caching of JSP content, servlet responses or arbitrary objects. oscache provides both in memory and persistent on disk caches, and can allow your site to have graceful error tolerance, oscache is a project of opensymphony group