pom.xml

 <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
            <plugin>
                <artifactId>maven-clean-plugin</artifactId>
                <version>2.5</version>
                <configuration>
                    <filesets>
                        <fileset>
                            <directory>src/main/web/dist</directory>
                            <includes>
                                <include>**</include>
                            </includes>
                        </fileset>
                        <fileset>
                            <directory>target</directory>
                            <includes>
                                <include>**</include>
                            </includes>
                        </fileset>
                    </filesets>
                </configuration>
            </plugin>
            <plugin>
                <groupId>com.github.eirslett</groupId>
                <artifactId>frontend-maven-plugin</artifactId>
                <version>1.9.1</version>

                <configuration>
                    <nodeVersion>v10.15.0</nodeVersion>
                    <workingDirectory>src/main/web/</workingDirectory>
                </configuration>

                <executions>
                    <execution>
                        <id>install node and npm</id>
                        <goals>
                            <goal>install-node-and-npm</goal>
                        </goals>
                    </execution>
                    <execution>
                        <id>npm install</id>
                        <goals>
                            <goal>npm</goal>
                        </goals>
                    </execution>

                    <execution>
                        <id>npm run build</id>
                        <goals>
                            <goal>npm</goal>
                        </goals>

                        <configuration>
                            <arguments>run build</arguments>
                        </configuration>
                    </execution>
                    <execution>
                        <id>prod</id>
                        <goals>
                            <goal>npm</goal>
                        </goals>
                        <configuration>
                            <arguments>run-script build</arguments>
                        </configuration>
                        <phase>generate-resources</phase>
                    </execution>
                </executions>
            </plugin>
        </plugins>
        <resources>
            <resource>
                <directory>src/main/web/dist/angular-app</directory>
                <targetPath>static</targetPath>
            </resource>
            <resource>
                <directory>src/main/resources</directory>
                <targetPath>.</targetPath>
            </resource>
        </resources>
    </build>