CODEWITHSUNDEEP
springjpaspring-boot
CrazySynthax
CrazySynthax

Reputation: 14988

Spring Boot: does @Entity Annotation exist?

I watched this Spring Boot tutorial: https://javabrains.io/courses/spring_bootquickstart/lessons/Creating-a-Spring-Data-JPA-Repository

and it puts an @Entity annotation before a class name. When I tried to do it in my code, I got an Error saying "can't resolve @Entity".

Here is my pom.xml file: 

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>
    <name>demo</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.3.RELEASE</version>
        <relativePath/><!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>


    <dependencies>

        <dependency>
            <groupId>org.eclipse.persistence</groupId>
            <artifactId>javax.persistence</artifactId>
            <version>2.1.0</version>
            <scope>compile</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.apache.derby</groupId>
            <artifactId>derby</artifactId>
            <scope>runtime</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

Do you know what is the problem?

Upvotes: 15

Views: 79719

Answers (19)

Feryohan
Feryohan

Reputation: 9

Using NetBeans IDE (Version 22), after adding the dependency in the pom.xml file:

<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>

Is necesary to do Build for your project to download the jar files and they can appear inside the library Dependencies:

Example of Jar file downloaded

After this, the IDE can find the dependency and the @Entity annotation works.

Upvotes: 0

user257902
user257902

Reputation: 11

I added the javax.persistence in the pom.xml file as a dependency, but it still required the version, so I grabbed a version from mvn repositories, this is what my dependency looks like, this was using eclipse editor. And it worked.

<dependency>
    <groupId>javax.persistence</groupId>
    <artifactId>javax.persistence-api</artifactId>
    <version>2.2</version>
</dependency>

Upvotes: 0

Vaishnavi
Vaishnavi

Reputation: 16

I had the same issues recently and i resolved it using adding this dependency that given below. I think the version change in spring boot made this error, now javax.persistence is not available instead we can use jakarta.persistence

        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-core</artifactId>
        <version>6.1.6.Final</version>
        <type>pom</type>
        </dependency>

Upvotes: 0

Himanshu Sharma
Himanshu Sharma

Reputation: 11

What Worked For Me In Last:-

  1. Go To File -> Project Structure -> Modules -> Click On Your Project Name
  2. Then Go To Dependencies click "+" and Then -> Library -> From Maven
  3. Then Search For javax.persistence.api Then Click Ok And Apply Changes

Upvotes: 1

Gihan Jayakuru
Gihan Jayakuru

Reputation: 101

i faced same issue, after add this dependencies fixed my issue

<dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>

    <dependency>
        <groupId>javax.persistence</groupId>
        <artifactId>javax.persistence-api</artifactId>
    </dependency>

Upvotes: 0

u0406081
u0406081

Reputation: 1

  1. go to File -> Project Structure -> Project Settings -> Facets in Intellij Idea
  2. click "+" and add "JPA" module

Upvotes: 0

Caffeine Coder
Caffeine Coder

Reputation: 1146

Most of the answers here are hit and try types which doesn't explain why @Entity annotation was not working and why it started working after adding certain dependencies.

Here's how it works-

For using persistence annotations you need to add relevant dependencies with their version, let's say we add spring-boot-starter-data-jpa as follows-

  <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-data-jpa</artifactId>
         <version>2.6.6</version>
      </dependency>

Now when you are using Intellij Idea as your IDE, you need to reload your maven project to re read the dependencies from your pom.xml.

Once you do that, @Entity annotation would be available for use.

Upvotes: 1

Anna U
Anna U

Reputation: 21

Click on the red bulb next to the @Entity annotation. Choose "Add dependency" - choose "javax.persistence.api" (NOT jakarta)

Upvotes: 0

Satish Varma
Satish Varma

Reputation: 266

Seems you are working with EclipseLink JPA implementation,

 <dependency>
            <groupId>org.eclipse.persistence</groupId>
            <artifactId>javax.persistence</artifactId>
            <version>2.1.0</version>
            <scope>compile</scope>
        </dependency>

Spring Data JPA works with Hibernate implementation by default. We need to exclude unnecessary Hibernate dependencies from spring-boot-starter-data-jpawhen working with other JPA implementations.

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
            <version>${spring.version}</version>
            <exclusions>
                <exclusion>
                    <groupId>org.hibernate</groupId>
                    <artifactId>hibernate-entitymanager</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>org.hibernate</groupId>
                    <artifactId>hibernate-core</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

If you are working with Hibernate, just spring-boot-starter-data-jpa is enough in your case.

I also seen "can't resolve @Entity" issue because of my IDE. In eclipse, click Project option -> Clean the project. This is solved my issue when project dependencies out of sync with IDE.

Upvotes: 0

Kuldeep Palia
Kuldeep Palia

Reputation: 11

Do a force update mvn clean install -U or you can right click on your project -->maven--> update if you are using eclipse/STS. this synchronizes the IDE with pom dependencies.

Upvotes: 0

Aaban Tariq Murtaza
Aaban Tariq Murtaza

Reputation: 1252

I added this dependency

        <dependency>
            <groupId>javax.persistence</groupId>
            <artifactId>javax.persistence-api</artifactId>
        </dependency>

Add this and enjoy.

Upvotes: 4

Minh Hai Vu
Minh Hai Vu

Reputation: 11

I had the same problem. After I configured the new dependency on pom.xml file, the @Entity annotation is not found because these dependencies is not found. To solve it, the IntelliJ IDE then suggested me to load the Maven changes. On the pom.xml screen, click on the icon to reload Maven.

Upvotes: 1

Sikandar Ali Awan
Sikandar Ali Awan

Reputation: 129

Use spring-boot-starter-data-jpa

<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-data-jpa</artifactId> 
</dependency>

It works for me ... :)

Do not use the following one

 <dependency>
    <groupId>org.springframework.data</groupId>
    <artifactId>spring-data-jpa</artifactId>
 </dependency>

Upvotes: 12

himani parikh
himani parikh

Reputation: 11

In my case, by adding the spring-boot-starter-data-jpa dependency to the classpath it worked.

Upvotes: 1

Atreya Nataraj
Atreya Nataraj

Reputation: 21

Spring STS usually shows this error when the set up isn't correct.

  1. Go to the line containing the error
  2. Click on the alert bulb so that it can suggest possible fixes
  3. From the options, choose the "Fix project setup"

Follow the rest so that the project then re-aligns the import order.

Upvotes: 2

James P.
James P.

Reputation: 16

put this in your file at the top as an import statement 

import javax.persistence.*;

Upvotes: -2

Arena Hernandez
Arena Hernandez

Reputation: 51

Make sure you Maven projects are imported successfully.

In the lower right corner of your IntelliJ there will a prompt asking you if you want to import the changes. It will also ask you if you want to enable Auto-Import.

Upvotes: 0

sanskarsharma
sanskarsharma

Reputation: 373

I also faced this problem recently. For me, the spring-boot-starter-data-jpa dependency was the issue. Although it was in the pom.xml file without any errors, but the jars were not there in classpath - even after syncing maven and importing dependencies multiple times in different ways ( mvn clean/update/install).

<dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>

The IDE I was using was IntelliJ Idea.

What worked for me at last : I just put this dependency over all other dependencies inside the <dependencies> ... </dependencies> tag, i.e just changed the order of dependencies and synced. That worked in my case, not sure why.

Below is my pom.xml file contents for reference.

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>

<groupId>dev.sanskar.courses</groupId>
<artifactId>course-api</artifactId>
<version>1.0-SNAPSHOT</version>

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.0.3.RELEASE</version>
</parent>

<dependencies>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>


    <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
    </dependency>


    <!-- https://mvnrepository.com/artifact/javax.persistence/javax.persistence-api -->
    <dependency>
        <groupId>javax.persistence</groupId>
        <artifactId>javax.persistence-api</artifactId>
        <version>2.2</version>
    </dependency>


    <!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-validator -->
    <!-- https://mvnrepository.com/artifact/org.hibernate.javax.persistence/hibernate-jpa-2.1-api -->
    <!-- https://mvnrepository.com/artifact/org.hibernate.javax.persistence/hibernate-jpa-2.1-api -->
    <!-- https://mvnrepository.com/artifact/javax.persistence/persistence-api -->


</dependencies>

<properties> 
    <java.version>1.8</java.version>
</properties>


<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
    </plugins>
</build>

Upvotes: 20

Rajith Pemabandu
Rajith Pemabandu

Reputation: 616

suppose you have missed a dependency.

<build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

There are useful sample spring boot projects in this github page.it will be helpful to have a look.

Upvotes: 1

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