Jpa Questions

I want to make an entity that has an autogenerated primary key, but also a unique compound key made up of two other fields. how do i do this in

A java ee project using spring framework (spring-boot).

In my code i have two entities busdetails and user. the user and the busdetails has many to many relationship. whenever i try to book bus, the

I need to write a "reverse" like condition with jpa predicate over oracle dbms. the example query i need to build is:

On succesfull authentication i'd like to make a call to db to retrieve some additional info but i get:

I could prototype this and see what happens, but i am being lazy. i want to be able to inject an ejb3 into my jpa entity listener so that it can

Does anybody know if hibernate's static initialize() method, which populates a proxy object, will attempt to hit the second-level

What are the steps required to enable hibernate's second-level cache, when using the java persistence api (annotated entities)? how do i check

I have java springboot project with repository that included boolean custom query. but the system run to null pointer exception apart from return

My repository interfaces: songsrepository: public

I have the following entities class productunitofmessure @manytoone @joincolumn(name="product_id") private product

I have order entity that has orderitems list. @onetomany(mappedby ="order") list<orderitem>

I'm trying to create a webservice but when i try to get records from database(mariadb), the response is being shown as {} and does not show the

I want my ids to be uuid and there should be many-to-one relationship between student and course. i am getting incompitable types referencing

Let me start by saying i'm fairly new to spring boot so apologies if i'm making a silly mistake somewhere. i am trying to retrieve the value of my

I try to configure sort column using the rout.ts file of my entity. in the "data" tag i put defaultsort:

We have a batch job that needs to update millions of rows (not all rows) of a table with a particular value. we have the following

I'm developing a service and currently working on 2 of its entities (section and gradelevel) while i'm still developing,

I am working on a spring boot project using spring data jpa and i am wondering if exist a nice and elegant solution to the following use case.

I am working on a spring boot application using spring data jpa and i have the following problem. i have this eventlog

I want to get data from my entity with 1-m relationships. users have an entity for cv information.with jparepo, cv class : @entity

I need to delete an entity using its id, tried using jpa repository delete by id method productrepository.deletebyid(id);

I have that relationships (spring boot jpa implementation): one person have multiples addresses one address contains one country

I have an entity that has many fields mapped to columns in my database using the @entity and @column annotations. columns might include something

I need to load the post entities along with the postvote entity that represents the vote cast by a specific user (the

I having troubles to get the object in javascript expression thymeleaf, how can i resolved? i m trying to fill a select option with the

Deep diving into spring jpa and i have troubles to understand whats going on here. this is the code: entity

Analogous to the built-in method existsbyid i'd like to hava an existsallbyid method with spring data jpa. to achieve

These are the entities defined in my project: post @entity public class post implements serializable { public enum

When i try to fetch the child entity, it also gets the parent entity because of one to many bidirectional mapping but the parent entity inside the

I have two entities that looks like this (simplified for reading purposes). @entity public class machine { @primarykey

With this code: city.java @entity @table(name = "cities") public class city extends auditmodel { @id

I have troubles on grouping my query by date. i need to consolidate some data in daily manner in querydsl 4.1.4. there is almost none

I have an @entity with three fields a, b, c out of which a and b act as composite primary key. i created an @embeddedid

I want to apply parameter binding to the dynamic native query where the column name which i am fetching i will be passing that dynamically from

I am trying to use h2 database to test my quartz application which is running using spring boot. my application.properties looks like this :

I have an entity which is annotated with @entitylistener(mylistener.class) in the class mylistener, i have an

I am trying to paginate results with the jpa criteria api. after looking through this answer:

Currently in my spring boot application.properties file, i am specifying following lines to connect to mssql server.

I have added below query dsl plugin in eclipse to generate qdsl classes. while using dsl classes in my repository its giving complication

I am doing a service that get data from a source and fetch them into my database by using jpa. the id is generated by using sequence. i have

I am stuck in a tricky situation while writing a jpql query, following are my tables:- order_ order_id

Hy all, i would like to know what is wrong with my custum query using spring data jpa. if i use

I'm trying to make a simple hello world app that changes a jpanel's background color to a random color when you click a button. here is my

It is possible to use constructor of varargs in @query (org.springframework.data.jpa.repository). what i mean is class like this:

I have the simplest of spring configuration cases so i don't know why i don't find how this is done. i have an interface

The sequence in oracle db is getting updated by cache size+lastnumber value, when app server(tomcat) gets restart. my application is using

I'm studying hibernate and jpa, and i am finding this term all the time. could someone explain me in a practical and didactic way, what is this

I use spring-data-jpa with spring-boot(v2.0.0.release), i just wrote a crud demo on mysql, but an exception occurs

Consider the following two entities: @entity public class hostmachine { @manytomany(fetch = fetchtype.lazy, targetentity =

I have the following domain object: public class quizz { private long id; private date when; private long userid; }

Using jpa optimistic locking we can control via a @version field if a database table has been updated by another transaction at the same time,

I have created a consumer on vert.x eventbus: @autowired private vertx vertx; public void registerconsumer() { eventbus eb =

I have a mapping problem with hibernate. in a @onetoone relationship, i don't want to cascade the update to the partner. this is my

E.g., will the below code run properly? or do i have to define a separate entity listener for each and every entity class? @entity

I am writing an update method in spring service and it says the getone() is deprecated, i have reviewed alternatives and the

Say i have a relationship like figure 1 (@onetoone between customer

I've a database structure built with jpa. to give a little bit context - the user is shown a datatable and some (many...) filters with which he

I need your help with the following problem: there is a spring boot project, it has two entities: bank and creditdetails, the bank refers to the

I am trying to build an expense tracker application using spring boot rest api. the following are the entity classes i have created. user

I have looked around and found various bits and pieces of information that have helped me so far but i am currently stuck with the following

I want to create jpa repository for spring authorization server using this code:

I have 2 entities, one for a tasklist and the other for users. the users can create tasks for themselves or their friends, so in the tasks entity

I'm failing at documenting my spring data rest api with openapi. nothing show in swagger-ui's homepage (and /v3/api-docs obviously). here

I want to insert an object into database in a transaction and after that object is saved in the database, i'd like to delete that it once a

I am using spring data to manage a rest api. all tables in my postgresql database has a primary key of type uuid. i am able to persist this data

First, here are my entities. player : @entity

I'm experimenting with mapstruct and follow this tutorial:

I tried but i couldn't find a better title so it looks weird but the question is actually very simple... i have a jpa query which uses a

I am using spring boot repository with native query. while i am trying to update few fields by query and supply wrong values it is not throwing

I'm trying to post a text from home.html template <form th:action="@{/process_addtext}"

I have defined customer entity @entity @table(name = "customer") public class customer { @id @generatedvalue(strategy =

I'm trying to use jpa pagination with custom query. pagination is working if match with 2 cases. case 1 : if data

I know that i can create an index for both a single column and a composite one. a also i can make an

So, i've been trying for many days to run my project, without success. spring boot + hibernate + jpa. oracle database. can anybody help me?

Try to implement data into my spring boot application at the start up. as i researched it should be working like this: user_role

I have an entity with some nested entities like this public class myentity { @manytoone

I am working on a java play project and trying to create a time tracker for users on projects. i have the following class for tracking time:

In my application there is an entity: @entity @table(schema = "hr", name = "personal_data") public class personaldata { }

I have these postgres tables: create table deals_new ( id bigserial primary key, slip_id text,

I have a @manytomany relationship table between user and diet classes. the table (userisonadiet) has 2 additional columns: fromdate (starting the

I have a model class like the following: package com.example.model; import java.util.map; import javax.persistence.column; import

I was setting up a basic crud web app with jpa in plain spring (no spring boot or spring data jpa) for educational purposes and faced a strange

Here is my product class @entity public class product { @manytoone(fetch=fetchtype.eager)

I am studying spring sts and trying to connect db with jpa. i am unfamiliar with spring so i have problem in connecting db.

I am making a webshop in java and i am currently working on the stock of the product. everything is working fine, however i seem to get this

I am working on a spring boot application. into a service class i have this service method: @override public user

Controller package com.bird.bird.controllers; import com.bird.bird.entity.manager; import

This is the json-response of a get-reqeust: { ... "_links": { "self": { "href":

So i have 2 jpanels, stopwatchdial, which are basically just circles with their constructor being (topleftx, toplefty, diameter, and last

I am still a beginner in hibernate.i have started reading the user guide in which i found this

I have created a basic spring boot application from spring initializr with the web, mongodb and jpa dependencies. when i

I am working on a spring boot project using spring data jpa and hibernate mapping. in my repository classes i am using a query by method

I am new at jpa , i use glassfish 4.1.1, when i try to create an entitymanagerfactory it shows this exception message:

I am trying to write a jpql query for subqueries. the query is as follows. select fos_name, count(allocation_bucket) as

My question is when an null ability occur in one to one relation even my child class primary key same like parent class primary key so when

When i try to get data from db about user, i get the following error: request processing failed; nested exception is

Employee class @entity @table(name = "employees") public class employee { @id @generatedvalue(strategy =

I am building a spring-boot application where i am using spring data jpa feature. please find below my dao layer code

I joined two tables and get different columns from both tables to load them into datatable. i want to order the columns by using datatable but how