tag:blogger.com,1999:blog-8962763253387334081.post8485209006854453818..comments2024-03-28T12:05:54.411+01:00Comments on Don't Panic: Recovering from database constraint violations in JavaThijs Vonkhttp://www.blogger.com/profile/12161242264508748111noreply@blogger.comBlogger6125tag:blogger.com,1999:blog-8962763253387334081.post-65390677911635029932021-08-03T02:37:09.515+02:002021-08-03T02:37:09.515+02:00bape hoodie
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Too much is clearly to learn about this. I believe you created good quality items in Functions also. Keep working, congrats! <a href="http://www.codeenforcement.co/" rel="nofollow">Tucson Code Enforcement Violations</a><br />hasnainhttps://www.blogger.com/profile/05845512156979808631noreply@blogger.comtag:blogger.com,1999:blog-8962763253387334081.post-37699526014170344992013-04-09T14:08:43.000+02:002013-04-09T14:08:43.000+02:00Hi,Will it work with JPA.Hi,<br><br>Will it work with JPA.seenukarthihttp://seenukarthi.comnoreply@blogger.comtag:blogger.com,1999:blog-8962763253387334081.post-82336902295125383982013-04-09T16:12:37.000+02:002013-04-09T16:12:37.000+02:00@seenukarthi Yes, it works with JPA. My sample pro...@seenukarthi Yes, it works with JPA. My sample project also uses the full Spring, Hibernate, JPA stack. See: https://github.com/42BV/jarb/tree/master/jarb-sampleJeroen van Schagenhttp://www.jarbframework.orgnoreply@blogger.comtag:blogger.com,1999:blog-8962763253387334081.post-32152451482695328062013-04-10T11:22:38.000+02:002013-04-10T11:22:38.000+02:00Spring offers something like this since the beginn...Spring offers something like this since the beginning (SQLExceptionTranslator) and nowadays even the dreaded java.sql.SqlException comes along with some meaningful sub-classes.<br>Then again, I like to use database constraint to the fullest extent, i.e. trying to express all model invariants as database constraints. Databases are usually better at handling concurrency than homegrown code, too.<br>As a logical extension, an SQLException shouldn't be mapped to a generic exception but to an application-specific one, say CityInAddressMissingException. That's were a pluggable translator comes in handy.<br><br>Is the JaRB mapping pluggable?<br><br>There are two difficulties associated with recovering from constraint violations you didn't mention:<br>1. When you need to act on a violation (i.e. sending a JMS message), you can't rollback the transaction, so you have to roll back the transaction manually, so cleaning up everything you've done so far in the transaction is your job, not the database's one. Explicitly design your code for this.<br>2. Some constraints are deferred, so the exception will be thrown only after the commit of the transaction. Usually, that happens after the business layer call - being the natural UoW - has returned. A dynamic proxy or aspect can deal with this. Now, if the application exceptions are checked, that leads to the somewhat weird situation, that the business layer declares to throw exceptions, which are never thrown by the business code itself, but by the proxy surrounding it.Frisiannoreply@blogger.comtag:blogger.com,1999:blog-8962763253387334081.post-34789241873296546672013-04-11T15:25:09.000+02:002013-04-11T15:25:09.000+02:00@Frisian I totally agree that constraint violation...@Frisian I totally agree that constraint violations should throw application specific exceptions, rather than a generic exception. Specific exceptions are obvious, making the code understandable and they also closely relate to the domain you are programming for.<br><br>JaRB mappings are fully pluggable. We link application specific exceptions to database constraints by annotation, allowing multiple type of matching strategies:<br> - Exact<br> - Exact ignore case<br> - Contains<br> - Starts with<br> - Ends with<br> - Regex<br><br>During startup we scan for annotated exceptions and automatically register them in our mapping.<br><br>I'm also aware of the SQLExceptionTranslator, but the translated DataAccessException still only provide a message and cause. JaRB generic exceptions provide full constraint information by API.Jeroen van Schagenhttp://www.jarbframework.orgnoreply@blogger.com