field1.setJcrName("ocm:a");
field1.setJcrType("String");
field1.setJcrAutoCreated(true);
field1.setJcrMandatory(true);
field1.setJcrMultiple(true);
classDescriptor.addFieldDescriptor(field1);
FieldDescriptor field2 = new FieldDescriptor();
field2.setFieldName("b");
field2.setJcrName("ocm:b");
field2.setJcrType("Long");