JPPF 4.2.1 发布，此版本是个维护版本，包括了重要的 bug 修复和改进。
Bug 修复
JPPF-297 Synchronization Deadlock in Queue/Job Processing
JPPF-299 DriverJobManagementMBean.getAllJobIds() reports an incorrect number of jobs
JPPF-300 Node default connection strategy does not retrieve the recovery port
JPPF-301 Deadlock in the adminstration console upon startup
JPPF-302 Server reports negative number of tasks when job is cancelled upon client disconnect
JPPF-304 Node default connection strategy uses incorrect default server port with manual settings
JPPF-308 Low performance of node/driver when the allocated heap is small
JPPF-309 Jobs with non-serializable task is still executed remotely
JPPF-311 Incorrect JMX remote classpath in wrapper-driver.conf and wrapper-node.conf
改进
JPPF-305 JPPFClient.submitJob() has a useless throws clause
更多问题请查看 issues 列表：http://www.jppf.org/tracker/tbg/jppf/issues/JPPF-<issue_number>
JPPF 相关链接
Web Site: http://www.jppf.org
Downloads: http://www.jppf.org/downloads.php
Documentation: http://www.jppf.org/doc/v4
User forums: http://www.jppf.org/forums
Issue tracker: http://www.jppf.org/tracker/tbg/jppf
SF.net project page: http://sourceforge.net/projects/jppf-project/
JPPF是一个开放源码的网格计算框架,它可以在一个分布执行环境中 同时运行多个java应用。JPPF框架使用一个兼容JCA 1.5规范的资源适配器与J2EE应用服务器进行集成，这个适配器为服务器提供了到原始网格服务的访问。
JPPF的突出特性
JPPF框架使用一个兼容JCA 1.5规范的资源适配器与J2EE应用服务器进行集成，这个适配器为服务器提供了到原始网格服务的访问。适配器通过实现异步任务提交从而避免了JTA事务超时的风险。
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