合同保存不了

一直在加载，然后加载没了，还在操作中。
日志如下
2018-01-29 09:18:05 ERROR [con.err-Thread 430] Exception in thread "AWT-EventQueue-0"
2018-01-29 09:18:05 ERROR [con.err-Thread 430] java.lang.ClassCastException: sun.java2d.HeadlessGraphicsEnvironment cannot be cast to sun.awt.Win32GraphicsEnvironment
2018-01-29 09:18:05 ERROR [con.err-Thread 430] at sun.awt.windows.WToolkit$5.run(WToolkit.java:771)
2018-01-29 09:18:05 ERROR [con.err-Thread 430] at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:312)
2018-01-29 09:18:05 ERROR [con.err-Thread 430] at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:745)
2018-01-29 09:18:05 ERROR [con.err-Thread 430] at java.awt.EventQueue.access$300(EventQueue.java:103)
2018-01-29 09:18:05 ERROR [con.err-Thread 430] at java.awt.EventQueue$3.run(EventQueue.java:706)
2018-01-29 09:18:05 ERROR [con.err-Thread 430] at java.awt.EventQueue$3.run(EventQueue.java:704)
2018-01-29 09:18:05 ERROR [con.err-Thread 430] at java.security.AccessController.doPrivileged(Native Method)
2018-01-29 09:18:05 ERROR [con.err-Thread 430] at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
2018-01-29 09:18:05 ERROR [con.err-Thread 430] at java.awt.EventQueue.dis