added jpa entity generator

templates/jpa-entity.java.mustache

@@ -47,11 +47,12 @@ public class {{name}} {
     @GenericGenerator(name = "{{name}}", strategy = "{{.}}"){{/strategy}}{{#id_type}}
     @Type(type = "{{.}}"){{/id_type}}{{/id_generator}}{{/isPkey}}{{#type.isCollection}}
     @ManyToMany{{/type.isCollection}}
+    {{^oneToOne}}
     @Column(
         nullable = {{nullable}}, 
         unique = {{unique}}, 
         columnDefinition = "{{columnType}}"
-    ){{#isEnum}}
+    ){{/oneToOne}}{{#isEnum}}
     @Enumerated(EnumType.STRING){{/isEnum}}{{#updateTimestamp}}
     @UpdateTimestamp{{/updateTimestamp}}{{#creationTimestamp}}
     @CreationTimestamp{{/creationTimestamp}}{{#oneToMany}}