How to solve the red error of spring-boot-maven-plugin in spring-boot

spring-boot-maven-plugin reported red error

Project scenario

When springboot was created for the first time, spring-boot-maven-plugin became popular

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

Solution

1. When choosing to create the Spring Initailizr project, select the spring-boot version

2. When you forget to select the version number (idea defaults to 2.5 .4), add the version number as shown in the figure below, it must be consistent with the spring-boot version number~

Refresh pom.xml and it will be ok ~

Maven plug-in spring-boot-maven-plugin

Application background

Directly use the package packaging function that comes with maven. When building the Jar package, it will not be The Jar packages that the project depends on are included together. When using the "java -jar" command to start the project, an error will be reported and the project cannot start normally.

At this time, we can consider citing the spring-boot-maven-plugin plug-in to create a Jar package for the project.

spring-boot-maven-plugin: Using this plug-in will introduce dependency packages when building Jar packages

In the pom.xml of the maven project, the following is added When the plug-in is packaged by running "maven package", it will be packaged into a JAR file that can be run directly. Use the "java -jar" command to run it directly.

<build>
	<plugins>
		<plugin>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-maven-plugin</artifactId>
            <version>2.5.5</version>
		</plugin>
	</plugins>
</build>

The general maven project packaging command will not package the dependent jar packages when building the Jar package, but the spring-boot-maven-plugin plug-in, All dependent jar packages will be packaged.

For example, the following jar package generated using the spring-boot-maven-plugin plug-in package contains all dependent jar packages under the BOOT/INF/lib directory:

If the spring-boot-maven-plugin plug-in is not used for packaging, its directory structure is:

For using the above spring-boot-maven- The package generated by the plugin plug-in can be directly used to start the project using the following command

java -jar xxx.jar

Special instructions

After the spring-boot-maven-plugin plug-in is introduced, mvn will be used when using the packaging function The jar or war generated by package is repackaged into an executable file, and the original file name is modified and the .origin suffix is ​​added.

If the project needs to be packaged as a war package, there is no need to introduce this plug-in. The native package plug-in of maven is enough.

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