One solution can be to make User.orders an eagerly fetched collection by @OneToMany(cascade=CascadeType.ALL, fetch = FetchType.EAGER) private Set<Order> orders = new HashSet<Order>(); Entity associations are lazily loaded by default. This means that the orders Set is actually just a proxy object that won’t get initialized until you invoke a method on it. This is good, … Read more
From the javadocs, it means: (Optional) The foreign key columns of the join table which reference the primary table of the entity that does not own the association In layman’s terms, it is the column of Category that will be used as a part of the JoinTable relationship between the current entity and Category. If … Read more
Consider the situation where the owned entity type can also be owned by another parent entity type. Do you put foreign key references in the owned table to both parent tables? What if you have three parent types? It just doesn’t scale to large designs. A join-table decouples the join, so that the owned table … Read more
As said We have a distinct layer for business logic (usually called Service layer) Domain-Driven-Design (DDD) states you should put business logic inside your domain model. And, believe me, it is really good. As said by POJO in Action book about Service layer It is Use Case driven It can define Transaction boundaries Before @Service … Read more
Can someone please answer how to disable caching in persistence.xml. The second-level cache and query cache are disabled by default (and queries are not cached unless you explicitly cache them). The first-level cache can’t be disabled. I tried to disable by changing properties (…) This would disable the second-level cache and query cache, if they … Read more
Thanks Vlad Mihalcea we have such opportunity! ) He created hibernate-types lib: <dependency> <groupId>com.vladmihalcea</groupId> <artifactId>hibernate-types-52</artifactId> <version>2.1.1</version> </dependency> which adds a support of ‘json’, ‘jsonb’ and other types to Hibernate: @Data @NoArgsConstructor @Entity @Table(name = “parents”) @TypeDefs({ @TypeDef(name = “string-array”, typeClass = StringArrayType.class), @TypeDef(name = “int-array”, typeClass = IntArrayType.class), @TypeDef(name = “json”, typeClass = JsonStringType.class), @TypeDef(name … Read more
What’s wrong is the following: @OneToMany(fetch = FetchType.LAZY) @JoinColumn(name=”idEmployees”) public List<Task> getTasks() { return tasks; } And it’s wrong for two reasons. @JoinColumn(name=”idEmployees”) means: this OneToMany is mapped using a join column (i.e. a foreign key) named idEmployees. But the join column is not named idEmployees. idEmployees is the primary key of the Employee table. … Read more
The equivalent to the nvl command in HQL is the coalesce command. coalesce(a,b) will return a if a is not null, otherwise b. So you would want something on the lines of: from Table where col1 = coalesce(:par1, ‘asdf’)
We recently had this issue, but the Connection Pool Error message was eventually just baiting. The real problem was a third-party system that did not accept more messages, thus blocking each thread. The connection never returned to the Pool if the thread had previously acquired a Connection from HikariCP. Hence, we had as many successful … Read more
As per the best of my knowledge, your configuration is not proper for current session. Instead of <property name=”hibernate.current_session_context_class”>org.hibernate.context.ThreadLocal‌​SessionContext</property> use <property name=”hibernate.current_session_context_class”>thread</property> For more information on this, please visit this link: http://docs.jboss.org/hibernate/orm/3.3/reference/en/html/architecture.html#architecture-current-session Specially, read the last lines of last paragraph. For those who’re using Hibernate 4.1, <property name=”hibernate.current_session_context_class”>org.hibernate.context.internal.ThreadLocalSessionContext</property> Reference: https://docs.jboss.org/hibernate/orm/4.1/javadocs/org/hibernate/context/internal/ThreadLocalSessionContext.html