Tool bench

Stop hunting for those three config lines: tick the shape you want, read the cost written under the output, copy it home. Every answer in the console comes from a Java kernel actually running in your browser.

Generatorpom.xml dependenciespom.xml2 / 16

Tick only what this lesson needs: more options means more unfamiliar failures at startup. That is not the generator misbehaving — it is a real project arriving early.

groupIdartifactIdJava version

Output

<?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>3.3.4</version> <!-- 版本由 BOM 统管，子依赖不写 version -->
        <relativePath/>
    </parent>

    <groupId>com.example</groupId>
    <artifactId>demo-service</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    <properties>
        <java.version>17</java.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

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

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

Why each choice matters

parentInheriting 3.3.4 starter-parent means no spring-boot-starter-* needs a version; the moment someone adds an explicit version to one starter, that one wins — the most common source of dependency drift.

WebAnything that serves HTTP needs it: DispatcherServlet, embedded Tomcat and JSON mapping come inside this starter.

ValidationWithout it @Valid silently does nothing — @NotNull on its own checks no one.

The generator does not do your thinking: it writes “why this line exists” under the output. Read those lines before you copy.

TeaVMKernel console · free playidlekernel working…

No guard rails here: every command is available. boot first, then beans, then switch jdbcOnClasspath off and watch the dependency chain collapse one layer at a time.

This is a real container: the Java kernel is compiled into your browser. Type help, or tap a button below.

kernel:~$