![]() Having considered the drawbacks, there are some powerful benefits to using annotations.Maintaining the mapping information as external XML files allows that mapping information to be modified to reflect business changes or schema alterations without forcing us to rebuild the application as a whole.legacy code), we may prefer the use of external XML-based mappings in comparison to the decompilation of class files to obtain Java source code for alteration. If we do not have the source code to our POJOs (because it was generated by an automated tool or something similar e.g.So, If we are migrating from a legacy environment, we may not want to alter the pre-existing POJO source code, in other words, we will not like to change the known good code with possible bugs.Remember, don’t fix it if it isn’t broken. ![]() We would like to stick with mappings because they are still functional and working well. All else being equal, we will not want to re-express these mappings using annotations just for the sake of it. If we are upgrading from a legacy Hibernate environment or working with an existing legacy Hibernate environment, we will already have XML-based mapping files to support our codebase.Let us list down all possible cons one by one. Let’s discuss the drawbacks and benefits of annotations over XML before discussing when to apply them. ![]() Today annotations are the newest way to define mappings but it is not automatically the best way to do so. Various tools from Hibernate and third-party projects allowed part or all of these mappings to be generated from Java source code automatically. As we know that prior to the inline annotations, the only way to create hibernate mappings was through XML files.
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