Recent questions tagged JPA

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jpa - Hibernate problem - "Use of @OneToMany or @ManyToMany targeting an unmapped class"

I'm finding my feet with Hibernate Annotations and I've hit a problem I hope someone can help with. I have ... guidance would be great, thanks! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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jpa - Hibernate: comparing current & previous record

I want to compare the current value of an in-memory Hibernate entity with the value in the database: HibernateSession ... oldEntity note... :-( See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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jpa - How to use @Where in Hibernate

Searched for a few hours, but I'm stuck in a my learning curve for PlayFramework with JPA. I'm building a ... answer worked for me after all. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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jpa - @OrderColumn annotation in Hibernate 3.5

I'm trying to use the @OrderColumn annotation with Hibernate 3.5 @OneToMany(mappedBy = "parent",fetch=FetchType.EAGER ... save the new order to the database. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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jpa - How to generate Custom Id using hibernate while it must be primary key of table

Here is my pojo class @Entity public class Department { @Id @GeneratedValue(strategy=GenerationType.IDENTITY) @Column( ... must be as DEP0001, DEP0002,DEP0003 Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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jpa - Hibernate: one-to-one lazy loading, optional = false

I faced the problem that one-to-one lazy loading doesn't work in hibernate. I've already solved it, but still ... but I still can't grasp optional=false magic. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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jpa - Transaction is required to perform this operation (either use a transaction or extended persistence context) while persisting Entity

I am trying to develop a class that runs at specific intervals and performs some DB modifications. the code I ... required-to-perform-this-operation-either-use-a-transaction-or-e...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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jpa - WildFly/Hibernate: update an embedded property failed

Currently, I am trying to update the eclipse-ee4j/cargotracker(originally it is a rewritten version of ... /questions/65839254/wildfly-hibernate-update-an-embedded-property-failed...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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jpa - Payara/EclipseLink: count on collection which owner is an Embedable return 0

Currently, I am trying to update the eclipse-ee4j/cargotracker to the latest Jakarta EE 8: https://github.com ... -count-on-collection-which-owner-is-an-embedable-return-0...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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jpa - Liberty class loading issues or problem with hibernate (migrating tomcat app on liberty)?

i have to deploy a multi-module application in ear on Liberty Server 20 in my Eclipse. This application use ... -loading-issues-or-problem-with-hibernate-migrating-tomcat-app-on...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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jpa - Alternative to change configurations of tests via 'Edit configurations'

So I need to run tests with eclipselink.mapping.onetomany.defer-inserts=true to have them being green. ... /alternative-to-change-configurations-of-tests-via-edit-configurations...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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jpa 2.0 - What is the difference between @Inject and @EJB

I'm currently learning the new Java EE 6 component models and am confused with the latest dependency injection ... questions/5889767/what-is-the-difference-between-inject-and-ejb...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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jpa 2.0 - What is the difference between @Inject and @EJB

I'm currently learning the new Java EE 6 component models and am confused with the latest dependency injection ... questions/5889767/what-is-the-difference-between-inject-and-ejb...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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jpa - How to join an entity and a custom select using CriteriaBuilder

I need to convert a certain query to JPA using CriteriaBuilder. The query looks like this: SELECT * FROM ENTITY1 ... how-to-join-an-entity-and-a-custom-select-using-criteriabuilder...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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jpa - EJB3 Transaction REQUIRES_NEW not committed

I'm having some troubles with EJB3/JTA transaction and transaction isolation. I'm using WildFly 17. I have a ... } } Is there something wrong using REQUIRES_NEW like this ?...

asked Feb 19, 2021 in Technique[技术] by 深蓝 (71.8m points)

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jpa - Telosys Timestamp Generation Date problem (missing nanosecond precision)

Telosys generates timestamp columns like that: @Temporal(TemporalType.TIMESTAMP) @Column(name="AKT_TS") private Date aktTs; ... , so that the whole precision can be used?...

asked Feb 19, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

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jpa - My spring-boot application is not connected to the mysql database

Access denied for user 'root //your db user name '@'localhost' (using password: YES) answer In Spring ... .1.jar:2.4.1] at net.javaguides.springboot.SpringbootThymeleafCloudWebAp...

asked Feb 19, 2021 in Technique[技术] by 深蓝 (71.8m points)

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jpa - Hibernate One To One Mapping , how not to insert child but bind to it

Does someone knows a method to use a One To One Mapping where you save the parent but not inserting any children. Maybe the ... table row (with the new PARENT ID as FK). Thanks !...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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2.2k views

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jpa 2.0 - Spring JPA Specification Join Two Tables Only to filter the Query

I have been Trying to generate JPA2 Specification that can filter data by joining another table. The tables are ApplicationUser{ String ... cq, cb) -> { return predicate??? } }...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.5k views

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jpa - storing OffsetDateTime into `TIMESTAMP WITH TIME ZONE` column. Which timezone will be stored into db?

I'm testing how timestamps are stored into Oracle DB using JPA and I'm a little surprised by the result. The oracle ... timezone of app server, it does not seem to make sense....

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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