Suppose you have an Order and an OrderLine. You can choose to have a unidirectional OneToMany between Order and OrderLine (Order would have a collection of OrderLines). Or you can choose to have a ManyToOne association between OrderLine and Order (OrderLine would have a reference to its Order). Or you can choose to have both, … Read more
It’s a bug, it seems that you can leave it that way and will cause no problem, but if you don’t want to see the message here are some solutions: (Edit: Option 2 seems to work better (see comments in this post)) 1.- singleSession configuration from DataSource.groovy https://jira.grails.org/browse/GRAILS-11198 2.- overriding the H2 dialect: public class … Read more
Ah, right after I posted this question a section of the spring data docs caught my eye: 73.5 Configure JPA properties In addition all properties in spring.jpa.properties.* are passed through as normal JPA properties (with the prefix stripped) when the local EntityManagerFactory is created. So, to answer my own question: prefix the javax.persistence properties with … Read more
With recent versions of Spring Boot this is much easier. Any beans of type com.fasterxml.jackson.databind.Module will be automatically registered with the auto-configured Jackson2ObjectMapperBuilder and applied to any ObjectMapper instances that it creates. This provides a global mechanism for contributing custom modules when you add new features to your application. 74.3 Customize the Jackson ObjectMapper First … Read more
If I understand well, you want to Join ScheduleRequest with User and apply the in clause to the userName property of the entity User. I’d need to work a bit on this schema. But you can try with this trick, that is much more readable than the code you posted, and avoids the Join part … Read more
You didn’t provide many relevant details so I will guess that you called getInvoice and then you used result object to set some values and call save with assumption that your object changes will be saved. However, persist operation is intended for brand new transient objects and it fails if id is already assigned. In … Read more
Taking a look at jsr always works! 8.2.1.6.3 Jar Files One or more JAR files may be specified using the jar-file elements instead of, or in addition to the mapping files specified in the mapping-file elements. If specified, these JAR files will >be searched for managed persistence classes, and any mapping metadata annotations found on … Read more
maybe because you are using MYSQL5DIALECT there’s a Postgres Dialect just used post it like this and for the improved naming strategy use EJB3 like Spring boot JPA insert in TABLE with uppercase name with Hibernate spring.jpa.database-platform=org.hibernate.dialect.PostgreSQLDialect hope it works for you
Annotations are a better choice for a new application, since it makes the application free from XML files. It is also less code and maintenance is easy. It also helps for refactoring the application (with IDE like Eclipse/NetBeans, etc.), which is the problem with XML since you need to change it manually. Answers: No issues, … Read more
A cursory search of Google for ‘hibernate custom id generator tutorial’ turned up the following possibilities. I’ve excluded those that don’t look useful and summarized the content of each. http://www.devx.com/Java/Article/30396 – covers the issues of generating an ID before the data is persisted (and hence does not yet have a business key). http://docs.jboss.org/hibernate/core/3.6/reference/en-US/html_single/#mapping-declaration – the … Read more