SpringBootApplication can not be resolved to a type error in Spring tool suite and maven

Question

I have created the maven project in spring tool suite. I created the pom.xml with required dependencies but facing error as "SpringBootApplication can not be resolved to a type". I have tried a couple of solutions like Maven -> Update Project..., Clean Project, deleted local repository directory of Maven (.m2), etc... also I tried creating another maven project but still the same error.

I think this is eclipse spring tool suite problem with maven. Is there any solution like patch by eclipse or anything else? Thanks in advance!

Pom.xml as follows

<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>io.javabrains.springbootquickstart</groupId>
    <artifactId>cource.api</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>Java Brains Cource API</name>
    <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-parent -->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.8.RELEASE</version>
    </parent>
    <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-parent -->
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>1.5.8.RELEASE</version>
            <type>pom</type>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
    <properties>
        <java.version>1.8</java.version>
    </properties>
</project>

Have you tried the command mvn clean install from the command line under your project? — Xavier Bouclet
– Xavier Bouclet, Commented Nov 26, 2017 at 1:04
... cannot be resolved to a type means the import is missing or can not be resolved. In the latter case, the The import ... cannot be resolved is the error you should look at. Do you have such an error? — howlger
– howlger, Commented Nov 26, 2017 at 8:27

helospark · Accepted Answer · 2017-11-26 20:25:46Z

3

You did not add the correct dependencies.

You should add

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter</artifactId>
    </dependency>

as a dependency (in <dependencies>) instead of spring-boot-starter-parent. Parent just defines the versions but does not actually add any dependency (you use it as a <parent> in Maven).

If you have test, also add spring-boot-starter-test.

I would also suggest to use https://start.spring.io/ to generate a working Spring Boot base project (also available from STS in File->new->Other->Spring Starter project).

answered Nov 26, 2017 at 20:25

helospark

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1 Comment

Ameet Over a year ago

Thank you! I understood the problem and it was because of incorrect dependency as helospark mentioned.

Kumaresh Babu N S · Accepted Answer · 2017-11-27 01:25:55Z

<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>io.javabrains.springbootquickstart</groupId>
<artifactId>cource.api</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>Java Brains Cource API</name>

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.8.RELEASE</version>
</parent>

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-autoconfigure</artifactId>
    </dependency>
</dependencies>

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

<properties>
    <java.version>1.8</java.version>
</properties>

</project>

Copy/Paste it in your POM.xml. Update the Maven project and it will fetch the required JARs.

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