一个客户使用的是Oracle BPM 10.3（即：以前的BEA AquaLogic BPM，其前身是Fuego）for WebSphere，最近出现每半小时重启一次的问题，经过分析最终定位是IBM JDK升级造成的，同时找到以下信息：

NOTE: Only for Java 5.0 Service Refresh 4 (build date:February 1st, 2007) and older. When you use delegated class loaders, the JVM can create a large number of ClassLoader objects. On IBM Java 5.0 Service Refresh 4 and older, the number of class loaders that are permitted is limited to 8192 by default and an OutOfMemoryError exception is thrown when this limit is exceeded. Use the -Xmxcl parameter to increase the number of class loaders allowed to avoid this problem, for example to 25000, by setting -Xmxcl25000, until the problem is resolved. Please examine the current thread stack trace to check whether a class loader is being loaded if there is an OutOfMemoryError. For example, the following stack trace indicates that a class loader is being loaded: at com/ibm/oti/vm/VM.initializeClassLoader(Native Method) at java/lang/ClassLoader. (ClassLoader.java:120)

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这里至关重要的一个参数是：-Xmxcl。上面的意思就是Java 5.0 SR4及以前的版本，这个参数默认是8192，如果类加载器加载的类超过这一数值就会报OutofMemoryError。解决办法就是不断的增加些值，直到找到一个合理数值。

注：Oracle BPM 10.3平台认证信息参考：

《Release Notes for Oracle Business Process Management 10gR3》

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