我的centos服务器上有tomcat 8，JPDA的配置是（在catalina.sh中）：
export JPDA_OPTS="-agentlib:jdwp=transport=dt_socket,address=8000,server=y,suspend=n"
但是在使用它一分钟后（并连接到这个端口），端口在 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
我的配置好吗？