springboot. Compilation error, what's the problem?

Question

Spring

I am doing a project at the rate of angular 8 and spring boot. There are no source codes for the course, I rewrote everything for the author, it works for him, I don’t. What is the problem?

Spring boot application maven
web, rest, mysql, jpa, liquibase, security, lombok

structure
src
-main
--java
---com
----hello
-----serverside
------model

4 Course model classes .java, CourseStudent.java, Role.java, User.java

Course.java

package com.hello.serverside.model;

import lombok.Data;
import javax.persistence.*;
import java.io.Serializable;

@Data
@Entity
@Table(name="course")
public class Course implements Serializable {
    
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @Column(name="name")
    private String name;

    @ManyToOne(fetch = FetchType.EAGER)
    @JoinColumn(name="instructor_id", referencedColumnName = "id")
    private User instructor;

}

CourseStudent.java

package com.hello.serverside.model;

import javax.persistence.*;

import lombok.Data;

import java.io.Serializable;

@Data
@Entity
@Table(name="course_student")
public class CourseStudent implements Serializable {
    
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @ManyToOne(fetch = FetchType.EAGER)
    @JoinColumn(name="student_id", referencedColumnName = "id")
    private User student;

    @ManyToOne(fetch = FetchType.EAGER)
    @JoinColumn(name="course_id", referencedColumnName = "id")
    private Course course;
}

Role.java

package com.hello.serverside.model;

public enum Role {
    STUDENT,
    TEACHER,
    MANAGER
}

User.java

package com.hello.serverside.model;

import lombok.Data;
import javax.persistence.*;
import java.io.Serializable;

@Data
@Entity
@Table(name="user")
public class User implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;


    @Column(name="name")
    private String name;

    @Column(name="username")
    private String username;

    @Column(name="password")
    private String password;

    @Enumerated(EnumType.STRING)
    @Column(name="role")
    private Role role;
}

src
-main
--resources

application.properties

spring.application.name=server-side

spring.datasource.url=jdbc:mysql://localhost:3306/dbschool?useSSL=false&useUnicode=true&useLegacyDatetimeCode=false&serverTimezone\
=UTC&createDatabaseIfNotExist=true&allowPublicKeyRetrieval=true&useSSL=true
spring.datasource.username=root
spring.datasource.password=sun
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

spring.jpa.hibernate.ddl-auto=none

spring.liquibase.change-log=classpath:/db/changelog/db.changelog-master.xml

src
-main
--resources
---db
----changelog

2 files db.changelog-1.0.xml, db.changelog-master.xml

db.changelog-1.0.xml

<?xml version="1.0" encoding="UTF-8"?>  

<databaseChangeLog  
        xmlns="http://www.liquibase.org/xml/ns/dbchangelog"  
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
        xmlns:ext="http://www.liquibase.org/xml/ns/dbchangelog-ext"  
        xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-4.3.xsd
        http://www.liquibase.org/xml/ns/dbchangelog-ext http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-ext.xsd http://www.liquibase.org/xml/ns/pro http://www.liquibase.org/xml/ns/dbchangelog http://www.liquibase.org/xml/ns/pro/liquibase-pro-4.3.xsd">  


<changeSet  id="1"  author="hello">  
    <sql>
    create table user (
        id bigint not null auto_increment,
        username varchar(255) not null,
        name varchar(255) not null,
        password varchar(255) not null,
        role varchar(255) not null,
        constraint pk_id primary key (id)
    );
    </sql>
    <rollback>
    drop table user;
    
    </rollback> 
    </changeSet> 

</databaseChangeLog>

db.changelog-master.xml

<?xml version="1.0" encoding="UTF-8"?>  

<databaseChangeLog  
        xmlns="http://www.liquibase.org/xml/ns/dbchangelog"  
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
        xmlns:ext="http://www.liquibase.org/xml/ns/dbchangelog-ext"  
        xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-4.3.xsd
        http://www.liquibase.org/xml/ns/dbchangelog-ext http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-ext.xsd http://www.liquibase.org/xml/ns/pro http://www.liquibase.org/xml/ns/dbchangelog http://www.liquibase.org/xml/ns/pro/liquibase-pro-4.3.xsd">  
<include file="db/changelog/db.changelog-1.0.xml"/>
</databaseChangeLog>

pom.xml

<?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>2.4.3</version>
    <relativePath/> <!-- lookup parent from repository -->
  </parent>
  <groupId>com.hello</groupId>
  <artifactId>server-side</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <name>server-side</name>
  <description>Demo project for Spring Boot</description>
  <properties>
    <java.version>1.8</java.version>
  </properties>
  <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-data-rest</artifactId>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-security</artifactId>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
      <groupId>org.liquibase</groupId>
      <artifactId>liquibase-core</artifactId>
    </dependency>

    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <scope>runtime</scope>
    </dependency>
    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <optional>true</optional>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-test</artifactId>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework.security</groupId>
      <artifactId>spring-security-test</artifactId>
      <scope>test</scope>
    </dependency>
  </dependencies>

  <build>
    <plugins>
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
        <configuration>
          <excludes>
            <exclude>
              <groupId>org.projectlombok</groupId>
              <artifactId>lombok</artifactId>
            </exclude>
          </excludes>
        </configuration>
      </plugin>
    </plugins>
  </build>

</project>

throws an error on startup

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2021-03-05 16:30:49.800 ERROR 15478 --- [           main] o.s.boot.SpringApplication               : Application run failed

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'liquibase' defined in class path resource [org/springframework/boot/autoconfigure/liquibase/LiquibaseAutoConfiguration$LiquibaseConfiguration.class]: Invocation of init method failed; nested exception is liquibase.exception.ChangeLogParseException: Error parsing line 8 column 261 of classpath:/db/changelog/db.changelog-master.xml: SchemaLocation: schemaLocation value = 'http://www.liquibase.org/xml/ns/dbchangelog http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-4.3.xsd         http://www.liquibase.org/xml/ns/dbchangelog-ext http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-ext.xsd http://www.liquibase.org/xml/ns/pro http://www.liquibase.org/xml/ns/dbchangelog http://www.liquibase.org/xml/ns/pro/liquibase-pro-4.3.xsd' must have even number of URI's.
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1786) ~[spring-beans-5.3.4.jar:5.3.4]

Answer 1

There xsi:schemaLocationis an extra URI in the db.changelog-master.xml file attributehttp://www.liquibase.org/xml/ns/dbchangelog