多线程操作一个HashMap,
当size = 2000以后,不断的new 一个新对象 put进HashMap去替换原来的,发现jvm一直不去释放被替换掉的对象的内存，直到有异常抛出：
Exception in thread "wy-2" java.lang.OutOfMemoryError: Java heap space
Exception in thread "wy-9" java.lang.OutOfMemoryError: Java heap space
Exception in thread "wy-4" java.lang.OutOfMemoryError: Java heap space
Exception in thread "wy-7" java.lang.OutOfMemoryError: Java heap space
Exception in thread "wy-5" java.lang.OutOfMemoryError: Java heap space


为什么java在heap space OutOfMemory前不去尝试运行GC?