Cannot import org.h2.server.web.WebServlet

问题

I am trying to configure my spring boot application to use h2 console. I found some articles and all of them use webServlet. But I can not import the class although I have h2 dependency added in my pom.xml. I get this error message can not resolve the symbol WebServlet. My import line

import org.h2.server.web.WebServlet;

Below is my pom.xml

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-aop</artifactId>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>org.apache.myfaces.core</groupId>
            <artifactId>myfaces-impl</artifactId>
            <version>2.2.6</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>org.apache.myfaces.core</groupId>
            <artifactId>myfaces-api</artifactId>
            <version>2.2.6</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-core</artifactId>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-logging-juli</artifactId>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-validator</artifactId>
        </dependency>
        <dependency>
            <groupId>javax.validation</groupId>
            <artifactId>validation-api</artifactId>
            <version>1.1.0.Final</version>
        </dependency>
        <dependency>
            <groupId>org.primefaces</groupId>
            <artifactId>primefaces</artifactId>
            <version>5.1</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>org.primefaces.extensions</groupId>
            <artifactId>all-themes</artifactId>
            <version>1.0.8</version>
        </dependency>
        <dependency>
            <groupId>org.ocpsoft.rewrite</groupId>
            <artifactId>rewrite-servlet</artifactId>
            <version>2.0.12.Final</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>

and my application.properties

spring.datasource.url=jdbc:h2:mem:AZ;DB_CLOSE_DELAY=-1;DB_CLOSE_ON_EXIT=FALSE
spring.datasource.driverClassName=org.h2.Driver
spring.datasource.username=sa
spring.datasource.password=
spring.jpa.database-platform=org.hibernate.dialect.H2Dialect

and configuration

@Bean
public ServletRegistrationBean h2servletRegistration() {
    ServletRegistrationBean registration = new ServletRegistrationBean(new WebServlet());
    registration.addUrlMappings("/console/*");
    return registration;
}

Let me know what I am missing here.

回答1:

Shouldn't h2 be a compile (instead of runtime) dependency?

回答2:

I had the same problem, probably running the same example. Had the correct maven pom.xml dependency but for some reason had to download the h2 driver jar directly from Maven. Then the code above worked. Taking away "runtime" element will default to compile.

    <!-- https://mvnrepository.com/artifact/com.h2database/h2 -->
    <dependency>
        <groupId>com.h2database</groupId>
        <artifactId>h2</artifactId>
        <version>1.4.192</version>
    </dependency>

回答3:

Just remove runtime form your h2 dependency and everything will be fine

回答4:

FYI, 'runtime' scope is default by design. The reason is mentioned in the following Github page. (I leave it to you to decide) https://github.com/spring-projects/spring-boot/issues/16509

来源：https://stackoverflow.com/questions/38151447/cannot-import-org-h2-server-web-webservlet