After we add an entity say Movie,the next stpe is to add colums..
When we click add column we have the option to specify 
1)name(this will be used as apart the api name)
2)Db column name
3)Datatype


The issue is the Db colum name is not used in the generated service.xml instead it uses the name in 1)
So when i add something like
1)cast
2)c2
3)String

results in "<column name='cast' db-name='cast' type='String'>
		</column>"

As aresult table is not created bcoz "cast" is keyword in DB like Mysql..