“SecurityException:密封违规"启动 Derby 连接时

I need do start the derby server from my java application using "org.apache.derby.drda.NetworkServerControl" class.
When I try to start the server it throws an exception.

代码:

NetworkServerControl server = null; 
server=new NetworkServerControl(InetAddress.getLocalHost(),1527,"user","123")
server.start(new PrintWriter(System.out));

错误:

Caused by: java.lang.SecurityException: sealing violation: package org.apache.derby.impl.store.raw.xact is sealed

谁能告诉我这个错误的原因?