转自: http://expectforever.spaces.live.com/
出现以下错误：
Exception in thread "Thread-2" java.lang.OutOfMemoryError: unable to create new native thread
at java.lang.Thread.start0(Native Method)
at java.lang.Thread.start(Thread.java:574)
at com.verye.nad.framework.communication.SocketListener.run(SocketListener.java:66)
发现：
JVM在启动一个线程的时候，将为线程分配堆栈，在jdk1.4上为每个线程分配256K，在jdk1.5上为每个线程分配1M，
每个JVM中的最大线程数 ：max Thread = (2G-Xmx)/stacksize
JDK1.4
-Xmx750 = 4580 threads.
-Xmx1000 = 3608 threads.
-Xmx1500M = 1663 threads
JDK1.5
-Xmx750M = 1129 threads
-Xmx1000M = 880 threads
-Xmx1500M = 384 threads