在tomcat 8中配置JPDA

Question

我的centos服务器上有tomcat 8，并且JPDA的配置是（在catalina.sh中）：

export JPDA_OPTS="-agentlib:jdwp=transport=dt_socket,address=8000,server=y,suspend=n"

但是在使用了几分钟（并连接到该端口）后，该端口已关闭，并且在catalina.out上出现以下错误

Listening for transport dt_socket at address: 8000
Debugger failed to attach: recv failed during handshake: Resource temporarily unavailable
Debugger failed to attach: timeout during handshake

我的配置可以吗？