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Hibernate - Many to Many Mapping via Join-Table

by Han Bo Sun

Detailed description of how many-to-many association works with Hibernate, using MySQL and Spring

JAXB – A Newcomer’s Perspective, Part 2

by Keyhole Software

In Part 1 of this series, I discussed the basics of loading data from an XML file into a database using JAXB and JPA. (If JSON is called for instead of XML, then the same idea should translate to a tool like Jackson.) The approach is to use shared domain objects – i.e. a single […]

Implement a Distributed Database to Your Java Application

by Sam B. Brown

Interference open cluster is a simple Java framework that enables you to run a distributed database service within your Java application

Latest Articles

Implement a Distributed Database to Your Java Application

by Sam B. Brown

Interference open cluster is a simple Java framework that enables you to run a distributed database service within your Java application

Hibernate - Many to Many Mapping via Join-Table

by Han Bo Sun

Detailed description of how many-to-many association works with Hibernate, using MySQL and Spring

JAXB – A Newcomer’s Perspective, Part 2

by Keyhole Software

In Part 1 of this series, I discussed the basics of loading data from an XML file into a database using JAXB and JPA. (If JSON is called for instead of XML, then the same idea should translate to a tool like Jackson.) The approach is to use shared domain objects – i.e. a single […]

All Articles

JPA

Hibernate - Many to Many Mapping via Join-Table

4 Jan 2016 by Han Bo Sun

Detailed description of how many-to-many association works with Hibernate, using MySQL and Spring

JAXB – A Newcomer’s Perspective, Part 2

26 Aug 2014 by Keyhole Software

In Part 1 of this series, I discussed the basics of loading data from an XML file into a database using JAXB and JPA. (If JSON is called for instead of XML, then the same idea should translate to a tool like Jackson.) The approach is to use shared domain objects – i.e. a single […]

Implement a Distributed Database to Your Java Application

7 Oct 2021 by Sam B. Brown

Interference open cluster is a simple Java framework that enables you to run a distributed database service within your Java application

Hibernate, spring boot data JPA, relationships

7 Dec 2021 by Afzaal Ahmad Zeeshan

Quote: create relationships between entities in a project that is being written from scratch, or specify what relationships to have between them? That's the best part about an ORM. You don't need to think about it yourself (apart from some index,...

Check date between two other dates spring data jpa

14 Jul 2023 by Andre Oosthuizen

There are a few issues you can check that might cause a no return on your date request. I have added comments in your code where you can check. I have also added the 'System.out.println' to debug all returned parameters in your controller, check...

Maven JPA integration: processor not found

19 Mar 2024 by Pete O'Hanlon

The beauty of annotation processing is that it doesn't require you to explicitly pick a type in the @SupportedAnnotationTypes. Change that line to @SupportedAnnotationTypes("*") and this should pick up any annotations that you have in the project.

Scala forms Issue

7 May 2014 by salah_abughalyon

I am working on playframework and I have problem with scala forms when i apply the .get() methode to the form to create object i got all the object attributes are null.here is my code:import play.data.*;import static play.data.Form.*;public static Result save() {Form...

java hibernate error “could not execute statement” in Session.save()

10 Aug 2014 by Vishal Jain @ TurtleTec Inc.

/** * Description of bankbranchcontactdetailsBean * * @author Vishal Jain */package com.beans;import javax.persistence.Entity;import javax.persistence.Table;import javax.persistence.TableGenerator;import javax.persistence.Id;import javax.persistence.Column;import...

java hibernate error “could not execute statement” in Session.save()

12 Aug 2014 by Vishal Jain @ TurtleTec Inc.

Please try implementing Serializable interface for your entity (although this is not imposed by Hibernate). Also rename _BankBranchContactId to id. And enable hibernate_sql logging to see the sql query fired.This is what is suggested to me and it worked. No Error or so.But Still Table not...

java hibernate the table not created even with <property name=“hibernate.hbm2ddl.auto”>update</property>

12 Aug 2014 by Vishal Jain @ TurtleTec Inc.

/** * Description of bankbranchcontactdetailsBean * * @author Vishal Jain */package com.beans;import javax.persistence.Entity;import javax.persistence.Table;import javax.persistence.TableGenerator;import javax.persistence.Id;import javax.persistence.Column;import...

Apache +tomcat clustering with mod_jk connector generates duplicate numbers

4 Mar 2015 by Sairam39

I recently established load balancing using apache 2.4 +mod_jk 1.2.37 +tomcat 6 environment.Everything working perfectly but I am having a scenario where a unique sequential no has to generate based on some conditions.But after deploying the application in all 3 (clusters) tomcats, my...

Sorting capped mongodb collection in spring boot

24 Nov 2019 by Member 12310790

I am trying to sort capped collection in descending order. what I have tried: @Query(sort = "{$natural:-1}") Flux findAllByConversationId(String conversationId); it gives: Query failed with error code 2 and error message cannot use tailable option with a sort other than...

Right approach for aggregating data from multiple tables in spring JPA

4 Jan 2020 by Member 14707219

I have a Q&A section where each question and answer has a user profile card associated with it. Which displays username, points etc. Data that makes up this user profile card is spread across multiple tables. I am fetching one or two columns from each of these tables. Now I am not sure what...

Right approach for aggregating data from multiple tables in spring JPA

4 Jan 2020 by Christian Graus

The id of the user should go against the question or answer, that seems obvious. If you need data across many tables to display this, create views

Get count of decedents of a selected ID in mysql , using JPA

15 Sep 2020 by Kasthuri Gunabalasingam

I have a table in DB as below.It accessing through JAVA(JPA) I have a table in DB as below.It accessing through JAVA(JPA) ID | Name | Parent_id 1 | Ann | NULL 2 | Mary | 1 3 | John | 2 4 | Joshep| 2 5 | Peter | NULL 6 |...

Get count of decedents of a selected ID in mysql , using JPA

15 Sep 2020 by Gerry Schmitz

This is what MS says about it: Quote: This executeUpdate method is specified by the executeUpdate method in the java.sql.Statement interface. If executing a stored procedure results in an update count that is greater than one, or that generates...

How to select max id after join using JPA criteria?

18 Feb 2021 by Swapnil722

I'm selecting max id of Dosage entity after join Farmers entity: cq.select(cb.max(root.get("id"))) .where(cb.equal(root.join("farmers").get("id"), id)); It doesn't return uniqueResult(); but all Farmers instead. What I have tried: ...

No property id found for type, but not a naming error

1 Aug 2021 by Andre Ridho

I am trying to learn SpringBoot and Thymeleaf and I am getting a PropertyReferenceException. Most of the answers online have to do with naming errors, yet I have no naming errors; everything is in perfect camel case. Any ideas? Relevant Code: ...

How can I understand the JPA user manual more easily?

27 Jul 2021 by Richard MacCutchan

See Java persistence API - Tutorial[^]

No property id found for type, but not a naming error

1 Aug 2021 by Member 15309186

change your model class to look like this @Id @GeneratedValue(strategy = GenerationType.SEQUENCE) @Column(name = "name_of_table_column", unique = true) String id;

Hibernate, spring boot data JPA, relationships

7 Dec 2021 by Member 15435322

I was wondering, what is the best way to create relationships between entities in a project that is being written from scratch, or specify what relationships to have between them? For example, as we can directly understand the relationship...

Spring boot data JPA @manytomany relationship referencedcolumnname couldn't associated

30 Jan 2022 by salam_verdim_alana_panyatkasi_olana

I have to Entity and relationship type between them ManyToMany. @SuppressWarnings("JpaDataSourceORMInspection") @Data @Entity public class Student { @Id private Long id; private Integer anotherId; @ToString.Exclude ...

How to replace JPA repository in my project ? I want to write custom queries

13 Apr 2022 by osemdeveloper

I have started to learn spring-boot framework with JPA and CRUD repositories . Also, I have completed a project using JPA where it is so easy to do crud operations . But, This is making me to miss how to write custom queries and understand the...

How to replace JPA repository in my project ? I want to write custom queries

13 Apr 2022 by Richard MacCutchan

Take a look at Lesson: JDBC Introduction (The Java™ Tutorials > JDBC Database Access)[^].

Confused by JPA / hibernate behaviour

25 Oct 2022 by Mohit Tomar

I'm new to Spring Boot and still learning concepts such as JPA and Hibernate. I was practicing CRUD operations and got an error that totally confused me. I have a project with 4 entities, Admin, Customer, Product, and Saleorder. There is an one...

Confused by JPA / hibernate behaviour

25 Oct 2022 by Richard MacCutchan

I would suggest going to https://www.baeldung.com/learn-jpa-hibernate[^] for some good learning resources.

I got error in save() method in spring-boot

19 Aug 2023 by jaikrishna310

I am trying to make a project in spring-boot! But in the controller, I am getting an error in the save() method as follows: The method save(S) in the type CrudRepository is not applicable for the arguments...

How to select all distinct records as entities - hibernate - JPA?

18 Mar 2023 by Swapnil722

I want to select all distinct records not a specific one and as entities. I'm using Hibernate 5.6.15, JPA 2.2 and JDK 11 LTS I tried to select transid as an Orders' entity but getting: Caused by: java.lang.ClassCastException: class...

How to select all distinct records as entities - hibernate - JPA?

13 Jan 2024 by Swapnil722

Here's the answer : public List custOrder() { try ( Session session = HibernateUtil.getSessionFactory().openSession()) { CriteriaBuilder cb = session.getCriteriaBuilder(); CriteriaQuery cq =...

Maven JPA integration: processor not found

15 Mar 2024 by Tyler Bakeman

Personal Project: I am new to Maven and have spent a few weeks troubleshooting pom errors with chatGPT. Tutorials are hard to come by online, because annotation-processing in Java is more complicated than the sources I've found. Issue in summary:...

Exception namedquery of name jpql.namedquery of name: odcalls.incomingnot found.

28 Apr 2016 by Prakhar Shrivastava

i found exception while creating a named query.its say NamedQuery:odcall.incoming not found. odcall.incoming is my entity name.What I have tried:@NamedQuery(name="odcalls.call", query="SELECT C.count(id)," + "C.date(CalllocalTime)," ...

JAVA: hibernate + hashmap

28 Mar 2018 by Asyraf Patt

How should i store the data into the object and calling it by using the hashmap ? means is : how should i get the data JPA extraction and call it at mymethod class ? ListCustomer.put(Long.valueOf(1), new Customer("","","","")); What I have tried: SelectCustomer private int...

How can I understand the JPA user manual more easily?

27 Jul 2021 by User 15041314

I'm new to JPA and generally understand what ORM technologies do. I'm having a serious problem, I want to understand the use of JPA from beginning to end in a comfortable way, instead of memorizing it. So, can you explain what was done here in...

Check date between two other dates spring data jpa

14 Jul 2023 by Thang Đai

I am writing a search function from date to date. But when I click search it doesn't return any results and it doesn't give me any error. file handover.html

I got error in save() method in spring-boot

17 Aug 2023 by Muhammad Anas 2023

The issue is with spring-data-jpa version, try changing to another version in pom.xml(if its maven) or you may use the below mentioned version if it works for your spring boot project version: ...