Cannot load driver class: org.h2.Driver in spring boot application

user_2800089 0
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I am trying to learn microservices by creating a dummy project. I have a config repository in git and a config server running at port 8888.It's working properly as I can see my settings as below: enter image description here

Now I have two microservice projects 1) customer service and 2) customer-account-service. customer microservice is running properly while customer-account-microservice is unable to start and throwing below exception:

*Caused by: 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: org.h2.Driver
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185) ~[spring-beans-5.0.11.RELEASE.jar:5.0.11.RELEASE]
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:583) ~[spring-beans-5.0.11.RELEASE.jar:5.0.11.RELEASE]
    ... 66 common frames omitted
Caused by: java.lang.IllegalStateException: Cannot load driver class: org.h2.Driver
    at org.springframework.util.Assert.state(Assert.java:94) ~[spring-core-5.0.11.RELEASE.jar:5.0.11.RELEASE]
    at org.springframework.boot.autoconfigure.jdbc.DataSourceProperties.determineDriverClassName(DataSourceProperties.java:224) ~[spring-boot-autoconfigure-2.0.7.RELEASE.jar:2.0.7.RELEASE]
    at org.springframework.boot.autoconfigure.jdbc.DataSourceProperties.initializeDataSourceBuilder(DataSourceProperties.java:176) ~[spring-boot-autoconfigure-2.0.7.RELEASE.jar:2.0.7.RELEASE]
    at org.springframework.boot.autoconfigure.jdbc.DataSourceConfiguration.createDataSource(DataSourceConfiguration.java:43) ~[spring-boot-autoconfigure-2.0.7.RELEASE.jar:2.0.7.RELEASE]
    at org.springframework.boot.autoconfigure.jdbc.DataSourceConfiguration$Hikari.dataSource(DataSourceConfiguration.java:83) ~[spring-boot-autoconfigure-2.0.7.RELEASE.jar:2.0.7.RELEASE]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_144]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_144]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_144]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_144]
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) ~[spring-beans-5.0.11.RELEASE.jar:5.0.11.RELEASE]
    ... 67 common frames omitted*

bootstrap.properties configuration for customer-account-microservice is as below:

enter image description here

pom.xml configuration for customer-account-microservice is as below:

<?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>2.0.7.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.microservice</groupId>
    <artifactId>customer-account-microservice</artifactId>
    <version>1</version>
    <name>customer-account-microservice</name>
    <description>Spring starter project for demonstrating spring feign client and circuit breaker</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud-services.version>2.0.3.RELEASE</spring-cloud-services.version>
        <spring-cloud.version>Finchley.SR2</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-hystrix-dashboard</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>2.7.0</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger-ui</artifactId>
            <version>2.7.0</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>io.pivotal.spring.cloud</groupId>
            <artifactId>spring-cloud-services-starter-circuit-breaker</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-config</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>com.h2database</groupId>
                <artifactId>h2</artifactId>
                <scope>runtime</scope>
            </dependency>
            <dependency>
                <groupId>io.pivotal.spring.cloud</groupId>
                <artifactId>spring-cloud-services-dependencies</artifactId>
                <version>${spring-cloud-services.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

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

</project>

Please help me in fixing the above exception.

microservices spring-boot spring
8 Answers

It seems that your dependency

<dependency>
    <groupId>com.h2database</groupId>
    <artifactId>h2</artifactId>
    <scope>runtime</scope>
</dependency>

has to be in dependencies element, not in dependencyManagement. Just look at this. Or maybe you have a child artifact, in that case you must share another pom xml.

user_108967020

I change it to 'compile' and it solved my problem.

        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
            <version>1.4.200</version>
            <scope>compile</scope>
        </dependency>
user_145064980

I was facing the same issue in IDEA IntellJ even after using the correct dependency in pom.xml. It boils down to IDE specific issue where it was not able to download h2 dependency. It worked after restarting the IDE.

user_25465110

In my case the problem was caused by some trailing blank characters behind the driver classname in application.properties

This fails (dots in the code snippet below should be read as whitespace chars):

spring.datasource.driverClassName=org.h2.Driver...

This succeeds:

spring.datasource.driverClassName=org.h2.Driver
user_57666910

in my case, I had a space after the "driver"

spring.datasource.driverClassName=org.h2.Driver...

I deleted it and it works just fine

user_149330090

I commented spring.datasource.driverClassName=org.h2.Driver, that worked like a charm for me

user_76607010

In my case I gave the gradle dependency wrong.

I should give it in dependencies {implementation}, but I gave it in dependencies {testImplementation} in build.gradle file

The below mentioned is right

dependencies {
  implementation 'com.h2database:h2:2.1.212' 
}
user_108682640

I hope you have added dependencies now add spring.datasource.platform=h2 in your application.properties

it worked for me

user_140889640
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