Product Version: NetBeans IDE Dev (Build 201111130600)
Java: 1.7.0; Java HotSpot(TM) Client VM 21.0-b17
System: Windows 7 version 6.1 running on x86; Cp1252; en_US (nb)
User directory: C:\Users\tester\.netbeans\dev
Cache directory: C:\Users\tester\.netbeans\dev\var\cache

Steps:
1. Choose File | New Project and select the Web Application template from the Java Web category.
2. Click Next in Name and Location page.
3. Click Next in Server and Settings page.
4. Click Finish
5. Invoke New | Other and choose Persistence | Entity Class
6. As Package enter value "entity" and push Next
7. Invoke drop down menu on Database Connection and select jdbc:derby://localhost:1527/sample[app on APP]
8. Push Finish

There will be entity:
@Entitypublic class NewEntity implements Serializable {
...
// Problem is that missing new line after annotation @Entity...