Cannot resolve class or package 'h2'

问题

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:

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

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>

PROBLEM:

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

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."

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.

回答1:

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>

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

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.

来源：https://stackoverflow.com/questions/50890147/cannot-resolve-class-or-package-h2

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java

Spring

maven

spring-boot