Graph/95756979-4adb-4f91-9688-d987f212259a

Domainunvalidated

JPA

95756979-4adb-4f91-9688-d987f212259a

JPA

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Public graph metadata

Updated5/1/2026

PageRank0.0005

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45 linked nodes

IMPLEMENTATION_OFComponent

spring boot

IMPLEMENTATION_OFPackage

instancio

PERTAIN_TOProblem

the first relationship is always automatically loaded although it shouldn't — using SQLAlchemy and Pydantic with a Postgres-Database. Tension: The second relationship works as expected. Outcome: I am going to have two different endpoints.

PERTAIN_TOSolution

annotate fields(ex: id) with `sequenceGenerator` not the Entity or class — @Entity @Table(name = "ENTITY") public class ENTITY extends PanacheEntityBase. Tension: those values are inconsistent. Outcome: @Id @SequenceGenerator(name = "ID_SEQ", sequenceName = "ID_SEQ", allocationSize =100) public Integer id;.

PERTAIN_TOProblem

"personal_details_id_no" in my "owner" tables with the @ManyToOne annotations are always null — when I execute my "saveData" runner function. Tension: the @OneToOne field (i.e. address_id_no) in PersonalDetail table is filled properly and doesn't give any issues. Outcome: the issue remains.

PERTAIN_TOSolution

public void setDevicesReceivedList(List devicesReceivedList) — in the runner function. Tension: needs to be explicitly called instead of using the Builder. Outcome: personalDetail.setDevicesReceivedList(detailsResponseDTO.getData().getDevicesReceived());.

PERTAIN_TOProblem

ERROR: relation "aircraft.aircraft" does not exist — When using postman to send a get request to retrieve all aircraft objects. Tension: I believe it stems from my entity design but I am not sure how to go about fixing it. Outcome: you don't have a table/view called 'aircraft' in the schema 'aircraft'.

PERTAIN_TOSolution

set this property in the application.properties file — This can be because the table is not present in your schema in the database. Tension: if the table does not exist then it will create or if the table exists then alter the table. Outcome: spring.jpa.hibernate.ddl-auto= update.

PERTAIN_TOProblem

I'm getting a syntax error with ALTER TABLE — I hooked up H2, but. Tension: It looks like H2 doesn't have the `ALTER TABLE OWNER to ` command. Outcome: Has anyone seen this before or know a clever way to get around this?

PERTAIN_TOSolution

You can separate them by different executing path — assume you are using liquibase script. Tension: The SQL is different between these 2 DBMS. Outcome: there is similar way to separate them.

PERTAIN_TOProblem

delete fails with 404, meaning it can't find the endpoint — My react app successfully gets and posts from/to Spring Boot JPA MySQL db. Tension: delete fails with 404. Outcome: meaning it can't find the endpoint.

PERTAIN_TOProblem

cannot resolve symbol DataJpaTest. Tension: building a small CRUD app to learn about JPA and the H2 database. Outcome: Spring Boot 4 modularizes the codebase so various things are moved to different modules/dependencies.

PERTAIN_TOSolution

Spring Boot 4. Tension: Spring Boot 4 modularizes the codebase so various things are moved to different modules/dependencies.

PERTAIN_TOProblem

I get a duplicate ID error — If I create a Person first and then try to create a PersonExtra with an existing Person's ID. Tension: it tries to persist both Person and PersonExtra.

PERTAIN_TOSolution

Use separate entities with one-to-one relations instead of trying to create PersonExtra and PersonBasic with the same primary key

PERTAIN_TOSolution

Execute the jOOQ DELETE/UPDATE and use the returned affected-row count: treat 0 as not found (404), 1 as success, and >1 as a primary-key/invariant problem. Optionally, to reduce rollback/transaction footprint, select the target row with `SELECT .. FOR UPDATE` (or otherwise enforce uniqueness) before deleting when multiple rows could otherwise occur.

PERTAIN_TOProblem

"No EntityManager with actual transaction available for current thread - cannot reliably process 'remove' call" — when trying to delete using the user email. Tension: When using the @Transactional it works, I've read that JPA uses @Transactional by default. Outcome: My question is, does JPA uses @Transactional by default and I'm doing something wrong or I really should explicitly use it on delete and update?

PERTAIN_TOSolution

you will have to give `@Transactional` explicitly either at Controller, Service or Repository level — since you have added a custom method - `void deleteByEmail(String email);`. Outcome: To run those methods transactionally, use `@Transactional` at the repository interface you define.

PERTAIN_TOSolution

if you use derived queries.

PERTAIN_TOSolution

flashcardSet.getUser().getFlashcardSets().remove(flashcardSet);.

PERTAIN_TOProblem

Outcome: Use `LONGTEXT` to handle large JSON.

PERTAIN_TOSolution

Use `LONGTEXT` to handle large JSON. Tension: Data too long for column 'value'. Outcome: ALTER TABLE your_table MODIFY COLUMN value LONGTEXT.

PERTAIN_TOProblem

Unable to save the model object in the spring boot which is having the enum property — we are using spring boot version 3.4.3 + spring data jpa project hibernate version 6+ AND spring security version 6+. Databae is postgres. Tension: In the database also I have created the column is of type enum. Outcome: Finally i have resolved this issue in the following way.

PERTAIN_TOSolution

in PostgreSQL you should define enum with uppercase — and in java just define entity and enum without any converter. Tension: the column is of type enum. Outcome: and it will be stored in database.

PERTAIN_TOProblem

I was thinking of creating a new constructor in User.java that maps every MapEntry to a field — public void createAccount(Map accountObject) throws Exception { logger.trace("Entering createAccount(). account=" +accountObject); User user = new User( ??? ); userRepository.save(user); }. Tension: but I was wondering if there is a better approach?

PERTAIN_TORootCause

expression is of type character varying — @Convert(converter = StringArrayConverter.class). Tension: column "columnName" is of type text[].

PERTAIN_TOProblem

column "columnName" is of type text[] but expression is of type character varying. Tension: Hint: You will need to rewrite or cast the expression. Outcome: Remove `StringArrayConverter` class. You don't need it.

PERTAIN_TOSolution

Remove `StringArrayConverter` class. — @Convert(converter = StringArrayConverter.class) @Column(name = "columnName", columnDefinition = "text[]"). Tension: You don't need it. Outcome: You don't need it.

PERTAIN_TOProblem

Everytime, I encounter the following error — public OrderView createOrder(PostOrderRequest request). Outcome: Removing `orderId(UUID.randomUUID())` from order Builder works like a charm.

PERTAIN_TOSolution

Removing `orderId(UUID.randomUUID())` from order Builder works like a charm. — The error occurs because the `@Id` field (`orderId`) is annotated with `@GeneratedValue(strategy = GenerationType.AUTO)`. Tension: Hibernate automatically generates the value for this field. Outcome: Removing `orderId(UUID.randomUUID())` from order Builder works like a charm.

PERTAIN_TORootCause

@OneToOne(fetch = FetchType.LAZY, mappedBy = "person", cascade = CascadeType.DETACH). Tension: changing the CascadeTypes or adding @OnDelete(onDeleteAction=SET_NULL), but nothing is working.

PERTAIN_TOProblem

Either the RfidTag will also get deleted (which I do not want) or I get an error like: org.hibernate.TransientObjectException — If I delete a Person that has an RfidTag. Tension: the assigned RfidTag should not get deleted, it should remain in the database, but the value for person_id should be set to NULL.

PERTAIN_TOProblem

Using a single @SequenceGenerator definition in a mapped superclass causes Product and Order entities to share the same database sequence, so ids are generated from the same sequence. The goal is to have separate sequence names per entity without relying on Hibernate-specific generator classes.

PERTAIN_TORootCause

it has to do an extra join under the covers. Tension: will generate SQL that won't match your native SQL. Outcome: JPQL requires from Staff->admin_staff_responses.

PERTAIN_TOProblem

Using what you have, the JPQL will be simply: `"Select sr FROM Staff s join s.adminStaffResponses sr where s.id = :staffId"`. Tension: This will generate SQL that won't match your native SQL - it has to do an extra join under the covers. Outcome: Using an intermediary class can allow you to access the admin_staff_responses table directly in JPQL if you wish to avoid the extra join.

PERTAIN_TOSolution

Using what you have, the JPQL will be simply: `"Select sr FROM Staff s join s.adminStaffResponses sr where s.id = :staffId"` — if you wish to avoid the extra join the JPQL requires from Staff->admin_staff_responses. Tension: might not affect performance enough to be worth changing and complicating your model. Outcome: Using an intermediary class can allow you to access the admin_staff_responses table directly in JPQL.

PERTAIN_TOProblem

Basic collection has element type 'uk.ac.rhul.cs2800.model.Grade' which is not a known basic type

PERTAIN_TOSolution

Place all JPA annotations on the same access level, either field level or method level

PERTAIN_TOProblem

updated from Spring Boot 3.3.6 to version 3.4.0. Tension: musterMetadatenRepository.saveAndFlush(musterEntity); // crashes here. Outcome: org.springframework.orm.ObjectOptimisticLockingFailureException: Row was updated or deleted by another transaction.

PERTAIN_TORootCause

you are providing your custom JPA configuration.

PERTAIN_TOProblem

I have this config bean: — @Configuration public class EclipseLinkJpaConfiguration extends JpaBaseConfiguration.

PERTAIN_TOSolution

for custom JPA configuration. Outcome: Modify to this:.

PERTAIN_TOSolution

You can achieve this by enabling a couple of settings: — Instancio.of(PersonEntity.class). Outcome: withSetting(Keys.BEAN_VALIDATION_ENABLED, true) .withSetting(Keys.JPA_ENABLED, true) .create();.

PERTAIN_TOProblem

Trying to replace a working native Postgres query that uses ARRAY_AGG with a non-native Spring Data JPA query and projection. Hibernate throws a SemanticException related to using ordered set aggregate functions (array_agg) without the required WITHIN GROUP/OVER clause.

PERTAIN_TOSolution

Use the JPQL/HQL variant that adds an OVER clause with partitioning (and ordering) so Hibernate accepts ARRAY_AGG, returning the projection via a constructor expression.

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