This modifies the generated bytecode and creates an implementation of the toString () method. The assertion in the last line fails, even though the entity is added to the set just a couple of lines above. We can annotate any class with the Lombok ToString annotation. This means there are no fields we can rely on to calculate the hashCode.įor example, let’s create a test entity: class TestEntity = false)Īnd execute the following code: TestEntity testEntity = new TestEntity() Īssert.isTrue( set.contains(testEntity), "Entity not found in the set") Even the id of an entity is often generated by a database, so it gets changed after the entity is first persisted. If the annotation is added to a static method, then it will lock on a static variable. Broken HashSets (and HashMaps)Įntity classes often get annotated with or The documentation of states:īy default, it'll use all non-static, non-transient fields, but you can modify which fields are used (and even specify that the output of various methods is to be used) by marking type members with or implementation for JPA entities is a sensitive subject. According to Lombok, using this annotation is preferred over using Java’s synchronized keyword because unlike the synchronized keyword which locks on this, the annotation will synchronize the method on an inner variable. This article shows the most common issues you may face using Lombok with JPA entities. By seeing above examples we can notice following differences.
#LOMBOK ANNOTATIONS CODE#
This is why we introduced a number of code inspections for Lombok to JPA Buddy. The Lombok Value and Lombok Data both annotations generate boilerplate code related to POJO items, one key difference is Value annotation is used to make your classes immutable. Analyzing the projects, we see people stumble into the same pitfalls over and over again. It is absolutely fine to use Lombok in your JPA projects, but it has some caveats. Turns out, a lot of them use Lombok for their entities. When annotation processing is driven by maven-compiler-plugin, JDT APT is always used in eclipse Therefore for seamless integration within an IDE annotation processing needs to be enabled 0 Content-Type: multipart/related boundary Annotation Description Test With Maven, declaring Lombok as a provided dependency is not enough you must also. Before writing a single line of code for it, we went through a ton of projects on GitHub to understand how people work with JPA. We develop JPA Buddy – a plugin for IntelliJ IDEA designed to make the use of JPA easier.
#LOMBOK ANNOTATIONS HOW TO#
In this article we’ll look at how the misuse of Lombok can hurt the performance of JPA applications or even crash them, and how to avoid that but still gain the benefits of using Lombok. However, there are a few things to consider when using it with JPA. Lombok is a great tool that makes your Java code concise and clean. Lombok ToString With the use of its ToString annotation, Lombok can automatically generate an implementation of the toString() method for the objects without the need for you to start the debugger to see the value of the fields.