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JPA QUESTIONS

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