Я новичок в кодировании.Я получаю ниже ошибку при попытке запустить Java-приложение в Springboot с H2DB.
[ERROR] Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 8.777 s <<< FAILURE! - in com.example.demo.DemoApplicationTests
[ERROR] contextLoads(com.example.demo.DemoApplicationTests) Time elapsed: 0.002 s <<< ERROR!
java.lang.IllegalStateException: Failed to load ApplicationContext
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class]: Invocation of init method failed; nested exception is org.hibernate.service.spi.ServiceException: Unable to create requested service [org.hibernate.engine.jdbc.env.spi.JdbcEnvironment]
Caused by: org.hibernate.service.spi.ServiceException: Unable to create requested service [org.hibernate.engine.jdbc.env.spi.JdbcEnvironment]
Caused by: org.hibernate.HibernateException: Access to DialectResolutionInfo cannot be null when 'hibernate.dialect' not set
[INFO]
[INFO] Results:
[INFO]
[ERROR] Errors:
[ERROR] DemoApplicationTests.contextLoads » IllegalState Failed to load ApplicationCon...
[INFO]
[ERROR] Tests run: 1, Failures: 0, Errors: 1, Skipped: 0
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 13.028 s
[INFO] Finished at: 2019-05-26T22:46:54+05:30
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-surefire-plugin:2.22.2:test (default-test) on project demo: There are test failures.
[ERROR]
[ERROR] Please refer to C:\Users\v\Desktop\demo\target\surefire-reports for the individual test results.
[ERROR] Please refer to dump files (if any exist) [date].dump, [date]-jvmRun[N].dump and [date].dumpstream.
[ERROR] -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException
Вот мой 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 http://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>2.1.5.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>demo</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-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</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>
Приложение:
package com.example.demo;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.domain.EntityScan;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import com.example.demo.StudentRepository;
@SpringBootApplication
@EntityScan("com.example.demo.Student")
@EnableJpaRepositories("com.example.demo.StudentRepository")
public class H2demoApplication implements CommandLineRunner {
// mvn spring-boot:run
private Logger LOG = LoggerFactory.getLogger("H2demoApplication");
StudentRepository studentRepository;
@Autowired
public H2demoApplication(StudentRepository studentRepository) {
this.studentRepository = studentRepository;
}
public static void main(String[] args) {
SpringApplication.run(H2demoApplication.class, args);
}
@Override
public void run(String... args) throws Exception {
LOG.info("Student count in DB: {}", studentRepository.count());
}
}
Entity:
package com.example.demo;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
@Entity
public class Student {
@Id
@GeneratedValue
private Long ID;
private String NAME;
private String SECTION;
public Student() {
}
public Student(Long ID, String NAME, String SECTION) {
this.ID = ID;
this.NAME = NAME;
this.SECTION = SECTION;
}
public Long getId() {
return ID;
}
public void setId(Long ID) {
this.ID = ID;
}
public String getName() {
return NAME;
}
public void setName(String NAME) {
this.NAME = NAME;
}
public String getSection() {
return SECTION;
}
public void setSection(String SECTION) {
this.SECTION = SECTION;
}
}
Repository:
package com.example.demo;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;
import com.example.demo.Student;
@Repository
public interface StudentRepository extends JpaRepository<Student, Long> {
}
У O / p должно быть «Число учеников в БД: 2»
Моя версия Java: версия Java «1.8.0_102» Java (TM) Среда выполнения SE (сборка 1.8.0_102-b14) Java HotSpot (TM)) 64-разрядная серверная виртуальная машина (сборка 25.102-b14, смешанный режим)
Ошибка выше при запуске mvn clean install в командной строке.Я определил конфигурации h2db в файле application.properties следующим образом:
Конфигурация H2
spring.h2.console.enabled=true
spring.h2.console.path=/h2
Datasource
spring.datasource.url=jdbc:h2:~/test
spring.datasource.username=
spring.datasource.password=
spring.datasource.driver-class-name=org.h2.Driver
в файле data.sql. Сохраненные данные для вставки:
insert into STUDENT
values(10001,'Ajay', 'AAA1');
insert into STUDENT
values(10002,'Ajit', 'AAA2');