Porque o projeto com pom, não está sendo importado ?
pom.xml
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>br.com.ghsistemas.principal</groupId>
<artifactId>principal</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>pom</packaging>
<name>Sistema principal</name>
<description>Sistema principal</description>
<organization>
<name>Netsoft</name>
</organization>
<scm>
<connection>guilherme@netsoft.eti..br</connection>
<developerConnection>Guilherme Costa Lopes</developerConnection>
</scm>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.7.RELEASE</version>
<relativePath />
</parent>
<modules>
<module>principal-core</module>
<module>principal-rest</module>
<module>principal-utilitario</module>
</modules>
<properties>
<java.version>1.8</java.version>
<java.encoding>UTF-8</java.encoding>
<maven.build.timestamp.format>dd/MM/yyyy HH:mm:ss
</maven.build.timestamp.format>
<maven.compiler.source>${java.version}</maven.compiler.source>
<maven.compiler.target>${java.version}</maven.compiler.target>
<project.build.sourceEncoding>${java.encoding}
</project.build.sourceEncoding>
<project.reporting.outputEncoding>${java.encoding}
</project.reporting.outputEncoding>
<project.main.basedir>${project.basedir}</project.main.basedir>
<dependency.commons-io.version>2.5</dependency.commons-io.version>
</properties>
<dependencies>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
<dependency>
<groupId>joda-time</groupId>
<artifactId>joda-time</artifactId>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>${dependency.commons-io.version}</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>${java.version}</source>
<target>${java.version}</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<configuration>
<failOnMissingWebXml>false</failOnMissingWebXml>
</configuration>
</plugin>
</plugins>
</build>
</project>