I have added the directory ../default\jboss-ejb3\lib to the class path. I think simple add the jar files should be enough. The compiler cannot interpret the annotations.
[echo] Compiling sources
[javac] Compiling 2 source files to C:\Dokumente und Einstellungen\jboss\workspace\onlinestore\build\classes
[javac] C:\Dokumente und Einstellungen\jboss\workspace\onlinestore\src\org\onlinestore\ejb\Customer.java:3: cannot find symbol
[javac] symbol: class Entity
[javac] @Entity
[javac] ^
[javac] C:\Dokumente und Einstellungen\jboss\workspace\onlinestore\src\org\onlinestore\ejb\Customer.java:12: cannot find symbol
[javac] symbol : class Id
[javac] location: class org.onlinestore.ejb.Customer
[javac] @Id(generate = GeneratorType.AUTO)
[javac] ^
[javac] C:\Dokumente und Einstellungen\jboss\workspace\onlinestore\src\org\onlinestore\ejb\Customer.java:23: cannot find symbol
[javac] symbol : class Column
[javac] location: class org.onlinestore.ejb.Customer
[javac] @Column(name = "firstname", length = 60, nullable = false)
[javac] ^
