StubRoutimes::jlong_disjoint_arraycopy

#
# A fatal error has been detected by the Java Runtime Environment:
#
#  SIGBUS (0x7) at pc=0x00007f9a785c2690, pid=1150, tid=140300276668160
#
# JRE version: 6.0_31-b04
# Java VM: Java HotSpot(TM) 64-Bit Server VM (20.6-b01 mixed mode linux-amd64 compressed oops)
# Problematic frame:
# v  ~StubRoutines::jlong_disjoint_arraycopy
#
# If you would like to submit a bug report, please visit:
#   http://java.sun.com/webapps/bugreport/crash.jsp

产生原因：通过代码实现文件下载功能，由于同一时间下载的文件数量过多，超过了服务器带宽，导致了jvm的崩溃。

解决方案：1.控制每次下载的文件数量；

   2.利用线程控制（Thread.sleep()）每个文件之间的下载时间间隔。