无法解析类或包"h2" [英] Cannot resolve class or package 'h2'

问题描述

我为我的Web应用准备了后端. 在我的项目(SpringBoot + Maven)中，我想添加h2日期基础. 根据网络上的教程:

I prepere back-end for my web app. In my project (SpringBoot + Maven) i would like to add h2 date base. According to tutorials from web:

1. 已添加到 application.properties

1. Added to application.properties

server.port = 8088
spring.h2.console.enabled=true
spring.h2.console.path=/h2
spring.datasource.url=jdbc:h2:mem:testdb
spring.datasource.username=sa
spring.datasource.password=
spring.datasource.driverClassName=org.h2.Driver    //h2 seems to be NOT found
spring.jpa.show-sql=true

将依赖项添加到 pom.xml

Added dependencies to pom.xml

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
    <groupId>com.h2database</groupId>
    <artifactId>h2</artifactId>
</dependency>

问题:

PROBLEM:

在 application.properties 中:无法解析类或程序包'h2'"

in application.properties : "Cannot resolve class or package 'h2'"

全面检查:检查Spring Boot应用程序.properties配置文件.突出显示未解决和不建议使用的配置密钥和无效值.仅适用于Spring Boot 1.2或更高版本."

full inspection: "Checks Spring Boot application .properties configuration files. Highlights unresolved and deprecated configuration keys and invalid values. Works only for Spring Boot 1.2 or higher."

当然，我的Spring Boot高于1.2(1.5.8). 我在网络中发现了类似的问题，但是消除依赖关系"不起作用，因此我仍然没有解决方案:).请帮忙.

Certainly, my Spring Boot is higher than 1.2 (1.5.8). I've found similar problem in web, but "reloding dependencies" doesnt work, so still i dont have a solution :). Please help.

推荐答案

问题似乎出在pom文件中.请找到我与您的application.properties文件一起检查过的pom.xml文件.

Looks like the issue is somewhere in your pom file. Please find my pom.xml file which I checked with your application.properties 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.mberazouski.stackoverflow</groupId>
    <artifactId>spring-boot-hibernate</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>spring-boot-hibernate</name>
    <description>Demo project for Spring Boot And Hibernate</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.3.RELEASE</version>
        <relativePath/>
    </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.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>com.h2database</groupId>
            <artifactId>h2</artifactId>
            <scope>runtime</scope>
        </dependency>
    </dependencies>
</project>

一旦弹簧启动将开始，请检查h2-console: http://localhost:8088/h2

Once you spring boot will start, check h2-console: http://localhost:8088/h2

希望这会有所帮助. P.S.如果您不知道，我建议您使用 http://start.spring.io/来生成您的项目.在这里，您可以选择计划使用的任何组件.您可以在此处中阅读有关此内容的更多信息.

Hope this will help. P.S. If you are not aware I suggest you use http://start.spring.io/ for generating of your projects. There you can pick any component which you plan to use. More about that you can read for example here.

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