Go to: http://my.oschina.net/cimu/blog/278724
This is one of the GUG in eclipse:
Bug 386171-jpa Java Change Event Handler (Waiting)
Workaround:
1.) Exit MyEclipse (or Eclipse);
2.) Enter the installation directory of MyEclipse (or eclipse);
In Linux:
mkdir disabledmkdir disabled/features disabled/pluginsmv plugins/org.eclipse.jpt.* disabled/pluginsmv features/org.eclipse.jpt.* disabled/features
In Windows:
Create a folder named disabled;
Create two folders under the Disabled folder with names of features, plugins, respectively;
Cut the jar file starting with ORG.ECLIPSE.JPT into the Disabled\plugins directory under the plugins directory;
In the features directory, the J folder starting with Org.eclipse.jpt is clipped to the Disabled\features directory;
Re-myeclipse (or Eclipse);
The first time after reboot will remind you to reconfigure content-assist;
You can perform the following command in place of the above actions:
mkdir disabledmkdir disabled\features mkdir disabled\pluginsmove plugins\org.eclipse.jpt.* disabled\pluginsmove features\org.eclipse.jpt.* disabled\features
After uninstalling the Eclipse plugin for dali/jpt, there is no longer a question of waiting a few seconds for the UI to stutter and save the file.
JPA Project Change Event handler problem resolution [GO]