从 spring 工具套件连接到数据库时出错

Question

Error creating bean with name 'org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaConfiguration': Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Hikari.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.zaxxer.hikari.HikariDataSource]: Factory method 'dataSource' threw exception; nested exception is java.lang.IllegalStateException: Cannot load driver class: oracle.jdbc.driver.OracleDriver

pom.xml file https://maven.apache.org/xsd/maven-4.0.0.xsd"> 4.0.0

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.2.6.RELEASE</version>
</parent>
<groupId>com.Projectdashboardtool</groupId>
<artifactId>Project</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>Project</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-web</artifactId>
    </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-jersey</artifactId>
    </dependency> -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-thymeleaf</artifactId>
    </dependency>

    <!-- <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web-services</artifactId>
    </dependency> -->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>com.oracle</groupId>
        <artifactId>ojdbc8</artifactId>
        <version>12.1.0</version>      
    </dependency> 

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
        <exclusions>
            <exclusion>
                <groupId>org.junit.vintage</groupId>
                <artifactId>junit-vintage-engine</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
</dependencies>

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

Controller class

@RestController
@RequestMapping("/project")
public class ProjectController {

    @Autowired
    private ProjectRepository projectRepository;

    @GetMapping
    public List<Project> list(){
        //List<Project> project=new ArrayList<>();
        return projectRepository.findAll();
    }

    @PostMapping
    @ResponseStatus(HttpStatus.OK)
    public void create(@RequestBody Project project) {
        projectRepository.save(project);

    }

    @GetMapping("/{id}")
    public Project get(@PathVariable("id") long id) {
        return projectRepository.getOne(id);

    }
}

Model class

package com.Projectdashboardtool.Project.Model;

import java.sql.Date;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;

import com.fasterxml.jackson.annotation.JsonFormat;
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;

@Entity
@JsonIgnoreProperties({"hiberanateLazyInitializer", "handler"})
public class Project {
    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    private Long id;
    private String dg_number;
    private String project;
    private String release_level;
    private String release_area;
    private String release_number;

    @JsonFormat(shape=JsonFormat.Shape.STRING, pattern="dd-MM-yyyy")
    private Date planned_release_date;
    private Date release_date;

    public String getDg_number() {
        return dg_number;
    }
    public void setDg_number(String dg_number) {
        this.dg_number = dg_number;
    }
    public String getProject() {
        return project;
    }
    public void setProject(String project) {
        this.project = project;
    }
    public String getRelease_level() {
        return release_level;
    }
    public void setRelease_level(String release_level) {
        this.release_level = release_level;
    }
    public String getRelease_area() {
        return release_area;
    }
    public void setRelease_area(String release_area) {
        this.release_area = release_area;
    }
    public String getRelease_number() {
        return release_number;
    }
    public void setRelease_number(String release_number) {
        this.release_number = release_number;
    }
    public Date getPlanned_release_date() {
        return planned_release_date;
    }
    public void setPlanned_release_date(Date planned_release_date) {
        this.planned_release_date = planned_release_date;
    }
    public Date getRelease_date() {
        return release_date;
    }
    public void setRelease_date(Date release_date) {
        this.release_date = release_date;
    }
    public String getRelease_type() {
        return release_type;
    }
    public void setRelease_type(String release_type) {
        this.release_type = release_type;
    }
    private String release_type;

    public Long getId() {
        return id;
    }
    public void setId(Long id) {
        this.id = id;
    }
    @Override
    public String toString() {
        return "Project [id=" + id + ", dg_number=" + dg_number + ", project=" + project + ", release_level="
                + release_level + ", release_area=" + release_area + ", release_number=" + release_number
                + ", planned_release_date=" + planned_release_date + ", release_date=" + release_date
                + ", release_type=" + release_type + "]";
    }

}

application.properties file
spring.jpa.hibernate.ddl-auto=update
spring.jpa.database-platform=org.hibernate.dialect.SQLServer2012Dialect
spring.datasource.url=jdbc:oracle:thin:@//hostname/servicename
spring.datasource.username=username
spring.datasource.password=password
spring.datasource.driver-class-name=oracle.jdbc.driver.OracleDriver

Answer 1

Adding dependency:

<dependency>
    <groupId>com.oracle</groupId>
    <artifactId>ojdbc8</artifactId>
    <version>12.1.0</version>      
</dependency>

And correct hibernate dialect - org.hibernate.dialect.OracleDialect should work.

Answer 2

I think you are using property file for DB oracle. From your exception i can able to see spring boot failed to load oracle driver. So download ojdbc6.jar from Oracle website or if you install oracle11g in your local system you can find ojdbc in jdbc/lib folder.

add this to your project, On eclipse right click on project --> build path --> add this jar.

So suppose you are using spring boot add this dependency to your pom.xml

<dependency>
 <groupId>com.oracle</groupId>
 <artifactId>ojdbc6</artifactId>
 <version>11.2.0</version>//add letest version
</dependency>

Suppose if your dependency not detected by maven follow the below steps:-

Run this command

mvn install:install-file - Dfile=C:\Users\user\.m2\repository\com\oracle\ojdbc6\11.2.0\ojdbc6.jar -DgroupId=com.oracle -DartifactId=ojdbc6 -Dversion=11.2.0 -Dpackaging=jar

Then You can Use this.

Answer 3

Oracle JDBC drivers are available on Central Maven. Check out this blog . You can add this GAV for 18.3 JDBC driver.

<groupId>com.oracle.database.jdbc</groupId>
<artifactId>ojdbc8</artifactId>
<version>18.3.0.0</version>