JPA QUESTIONS

JPA/eclipselink errors when migrating from java 8 to java 11

wish help you to fix your issue That is an odd exception. I don't know whether it will fix it, but your @OneToMany mappings should be using mappedBy attributes and not specify @JoinColumns. For example Table3.table2 should be mapped like this:

TAG : jpa

Date : January 02 2021, 06:48 AM , By : Sher Singh

How do I transition an entity to an enum in JPA?

may help you . The same table can be used with the following mapping in the user entity class:

TAG : jpa

Date : January 02 2021, 06:48 AM , By : krishna

JPA entity modified by reflection not merged by entity manager

seems to work fine Just find some good information about such behaviour at this :

TAG : jpa

Date : January 02 2021, 06:48 AM , By : opeled

one-to-one relationship using JPA

I wish did fix the issue. Simply add a column in the table "owning" the relation with a FK constraint. For example:

TAG : jpa

Date : January 02 2021, 06:48 AM , By : Rojin George

Error in Netbeans(?): attribute column name (length) is a reserved Java Persistence QL keyword

Any of those help If I'm not mistaken, escaping the column name in double quotes should work.

TAG : jpa

Date : January 02 2021, 06:48 AM , By : sushant

Is there such a thing as a wildcard for boolean value?

wish helps you How about using the IN operator instead? (TRUE, FALSE) will then be your wildcard. Alternatively, you should be able to use WHERE :balanced IS NULL OR invoice.balanced=:balanced. In that case, change boolean to Boolean and null becomes

TAG : jpa

Date : December 27 2020, 03:30 PM , By : user3083389

Micronaut Data: create and save new entity

I hope this helps you . You passed ID 0 to BookEntity constructor to indicate that it is a new entity. It works with JDBC, but when you are using JPA, 0 must be relaced with null. The following works as expected:

TAG : jpa

Date : December 25 2020, 09:30 PM , By : user3079355

EclipseLink PreUpdate on OneToOne Relationship not persisted

To fix this issue The JPA Spec states that:

TAG : jpa

Date : December 01 2020, 04:45 PM , By : user3044082

@Inject a @Stateless-bean into @Singleton/@ApplicationScoped-bean

should help you out I inject a Java EE @Stateless-bean into a @Singleton/@ApplicationScoped-bean: , From the JPA specs (version 2.1, chapter 7.2):

TAG : jpa

Date : November 24 2020, 05:49 AM , By : user3038426

JPA Exception : No externally managed transaction is currently active for this thread

With these it helps The executeUpdate() method requires for the EntityManager to be enlisted with a transaction - a global transaction in this case since you have defined a JTA-type persistence unit. You have chosen to use JPA's JSE bootstrapping app

TAG : jpa

Date : November 17 2020, 03:01 PM , By : LiuYong

How to use MERGE and PERSIST cascade types on many to one save or update operation?

this one helps. It turned out to be a transaction problem instead of cascade type. I was creating a new tnx after saving the scrMsgLine object. So it was becoming detached when i pass it to the new tnx. As a work around i read it from db in the begin

TAG : jpa

Date : November 16 2020, 06:27 AM , By : Daljit Singh Chaudha

Can't store OneToMany relationsship in my Database

This might help you I have a problem with the relationsship @OneToMany in JPA. I want to save a relationsship between a Customer and a Message Object but i got a NullPointerException. I don't know why, because i thought that the follwoing code will w

TAG : jpa

Date : November 12 2020, 03:00 PM , By : Synnennennen