Mojo The Maven exec plugin dropped/broke support for configuration an output file. It should be fixed: http://jira.codehaus.org/browse/MEXEC-86 JBoss Hibernate 4 supports auto type registration. This is a pretty powerful feature and makes using JodaTime in your entities a whole lot easier. Unfortunately, hbm2ddl doesn’t support that yet which means that you can’t remove the @Type […]
While debugging a Spring/Hibernate-based web application I found this in the logs. Pre-bound JDBC Connection found! HibernateTransactionManager does not support running within DataSourceTransactionManager if told to manage the DataSource itself. It is recommended to use a single HibernateTransactionManager for all transactions on a single DataSource, no matter whether Hibernate or JDBC access. Sounds as something […]
JPA batch inserts (aka bulk inserts) may seem trivial at first. However, if you’re not careful you won’t see the performance gains you expect even though your application works “just fine”. If you follow the below guidelines your JPA batch inserts should be blazingly fast, though. JPA batch inserts with Hibernate All the material presented […]
Creating a DDL in the Maven build with the hibernate3-maven-plugin fails if you explicitly configure an array of javax.persistence.CascadeType values in your JPA annotations. The stacktrace is similar to javax.persistence.PersistenceException: [PersistenceUnit: spontacts] Unable to configure EntityManagerFactory at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:265) at org.codehaus.mojo.hibernate3.configuration.JPAComponentConfiguration.createConfiguration(JPAComponentConfiguration.java:28) … Caused by: java.lang.ArrayStoreException: sun.reflect.annotation.EnumConstantNotPresentExceptionProxy at sun.reflect.annotation.AnnotationParser.parseEnumArray(AnnotationParser.java:673) at sun.reflect.annotation.AnnotationParser.parseArray(AnnotationParser.java:462) Once I realized what the actual […]
Assume entity A has a one-to-many relationship to B. So, you’d have a method like A#getBs(). However, sometimes you might/will only need the number of Bs and not the entities themselves i.e. you need the count. However, if you called A#getBs()#getSize() you’d effectively initialize the collection and thereby loading entities into memory for no reason. […]