I have an entity:
@Entity
public class User {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Integer id;
private String login;
private String password;
public User() {
}
public User(String login, String password) {
this.login = login;
this.password = password;
}
public String getLogin() {
return login;
}
public String getPassword() {
return password;
}
}
And i created an interface with annotation @Repository, which looks like:
@Repository
public interface UserRepository extends JpaRepository<User, Integer> {
}
So, i need to save in my database new users. But, if i use @Autowired UserRepository in my @Service class and call "save" method, it throws me an error 505 with description: HTTP Status 500 – Internal Server Error Type Exception Report
Message Cannot invoke "com.example.testservletjsp.repository.UserRepository.save(Object)" because "this.userRepository" is null
Description The server encountered an unexpected condition that prevented it from fulfilling the request.
Exception
java.lang.NullPointerException: Cannot invoke "com.example.testservletjsp.repository.UserRepository.save(Object)" because "this.userRepository" is null com.example.testservletjsp.account.UserService.saveUser(UserService.java:28) com.example.testservletjsp.servlets.ExplorerServlet.doPost(ExplorerServlet.java:68) javax.servlet.http.HttpServlet.service(HttpServlet.java:682) javax.servlet.http.HttpServlet.service(HttpServlet.java:765) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) Note The full stack trace of the root cause is available in the server logs.
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
https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.7.3</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>test-servlet-jsp</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<name>test-servlet-jsp</name>
<description>test-servlet-jsp</description>
<properties>
<java.version>11</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>4.0.1</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.30</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.2.8.RELEASE</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>3.3.1</version>
</plugin>
</plugins>
</build>
