Got this error:Project build error: For artifact {org.springframework.boot:null:2.2.6.RELEASE:jar}:

[martin codey]

<?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 https://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>2.2.6.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>

    <dependencies>

        <!-- Spring Security -->

        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-web</artifactId>
            <version>${spring-security.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-config</artifactId>
            <version>${spring-security.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-taglibs</artifactId>
            <version>${spring-security.version}</version>
        </dependency>

        <!-- Spring -->

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${spring.version}</version>
            <exclusions>
                <exclusion>
                    <artifactId>commons-logging</artifactId>
                    <groupId>commons-logging</groupId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-expression</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <!-- web -->

        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>${javax.servlet-api.version}</version>
            <scope>provided</scope>
        </dependency>

        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>${jstl.version}</version>
            <scope>runtime</scope>
        </dependency>

        <!-- test scoped -->

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>${spring.version}</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-test</artifactId>
            <version>${spring-security.version}</version>
            <scope>test</scope>
        </dependency>

    </dependencies>

    <build>
        <finalName>spring-security-mvc-login</finalName>
        <resources>
            <resource>
                <directory>src/main/resources</directory>
                <filtering>true</filtering>
            </resource>
        </resources>

        <plugins>

            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-war-plugin</artifactId>
                <version>${maven-war-plugin.version}</version>
                <executions>
                    <execution>
                        <id>default-war</id>
                        <phase>prepare-package</phase>
                        <configuration>
                            <failOnMissingWebXml>false</failOnMissingWebXml>
                        </configuration>
                    </execution>
                </executions>
            </plugin>

            <plugin>
                <groupId>org.codehaus.cargo</groupId>
                <artifactId>cargo-maven2-plugin</artifactId>
                <version>${cargo-maven2-plugin.version}</version>
                <configuration>
                    <wait>true</wait>
                    <container>
                        <containerId>jetty8x</containerId>
                        <type>embedded</type>
                        <systemProperties>
                            <!-- <provPersistenceTarget>cargo</provPersistenceTarget> -->
                        </systemProperties>
                    </container>
                    <configuration>
                        <properties>
                            <cargo.servlet.port>8082</cargo.servlet.port>
                        </properties>
                    </configuration>
                </configuration>
            </plugin>

        </plugins>

    </build>

    <properties>
        <!-- Maven plugins -->
        <cargo-maven2-plugin.version>1.6.1</cargo-maven2-plugin.version>
    </properties>

</project>

[Tim Cooke]

What's the full text of the error you get?

[martin codey]

Project build error: For artifact {org.springframework.boot:null:2.2.6.RELEASE:jar}: The
artifactId cannot be empty.

Also following this tutorial: Baeldung

[Tim Cooke]

You have placeholders for multiple properties that you have not defined in the properties section.

[martin codey]

Do you mean I should do something like this

<properties>
    <spring.version>3.0.5.RELEASE</spring.version>
</properties

And how do i know what version should I use?

[Stephan van Hulst]

If you start a new project, usually you use the latest. You can find it in the Spring user guide or on Maven Central.

If you're using NetBeans you can use auto-complete inside the version element and it will give a list of versions it downloaded from the available repositories.

[Rob Spoor]

martin codey wrote:Do you mean I should do something like this

<properties>
    <spring.version>3.0.5.RELEASE</spring.version>
</properties

And how do i know what version should I use?

You should drop them all. Your parent POM is the spring-boot-starter-parent. This defines all the Spring, Spring Boot, Servlet and JSTL dependencies in its dependencyManagement section (indirectly). All you need to do is add the dependency using the groupId and artifactId, and omit the version completely.

I'm not sure this will solve the issue though, as the error shows that it's not the version that's undefined, but the artifactId.