JPA
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Enterprise Java
Resolving the “Validation Failed for Query for Method” Error in Spring Data JPA
This article explains how to diagnose and resolve the error “Validation failed for query for method” in Spring Data JPA.…
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Enterprise Java
Spring Data JPA save() Method Explained
In Spring Data JPA, the save() method is commonly used to persist or update entities. A frequent misconception is that…
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Core Java
Joining Unrelated Tables with JPA Criteria API
In real-world enterprise applications, it is common to encounter database tables that do not have explicit JPA relationships (such as…
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Core Java
How to Fix Hibernate’s token ‘*’ SyntaxException
Hibernate’s JPQL (Java Persistence Query Language) provides an object-oriented abstraction over SQL, allowing us to query entities instead of database…
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Core Java
Handling JPA NoResultException When No Entity Is Found
In JPA or Hibernate, the runtime error javax.persistence.NoResultException: No entity found for query occurs when Query.getSingleResult() or TypedQuery.getSingleResult() expects exactly one result,…
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Core Java
Query JPA LocalDateTime Using LocalDate Example
Working with Java’s date and time API can be tricky, especially when your database column uses LocalDateTime but the query…
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Core Java
Using UNION Logic in Hibernate Applications
Hibernate is a Java ORM tool that allows interaction with relational databases using entity objects. However, it lacks native support…
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Enterprise Java
Hibernate Dirty Checking Explained: How Entity State Changes Are Detected
Hibernate is a powerful ORM (Object-Relational Mapping) tool that simplifies database interaction in Java applications. One of its most useful…
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Core Java
Working with Sequences in H2 Database
When developing Java applications with databases, auto-generating primary keys is a common requirement. Sequences are a reliable way to generate…
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