Talk about how to fix the problem that springboot makes maven-resources-plugin placeholder invalid

foreword

Earlier we talked about how to obfuscate code at . The article mentioned that there is a small pit in the use of allatori in the springboot project. This pit is when you configure in allatori.xml

<input>
        <jar in="${project.build.finalName}.jar" out="${project.build.finalName}.jar"/>
    </input>

${project.build.finalName} will be output as a string without parsing placeholders. As a result, the following error will be reported in the package

Reason for failure

This is the original words of the official website, to the effect that if you use spring-boot-starter-parent, maven-resources-plugin only recognizes @

Why only recognize @, I posted the configuration of spring-boot-starter-parent pom, probably everyone knows what happened

Repair plan

Option 1: According to the official website, change ${project.build.finalName} to @project.build.finalName@

  <input>
        <jar in="@project.build.finalName@.jar" out="@project.build.finalName@.jar"/>
    </input>

Option 2: Instead of directly introducing spring-boot-starter-parent, use
dependencyManagement, the placeholder is still ${project.build.finalName}

 <dependencyManagement>
        <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>${spring-boot.version}</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
        </dependencies>
    </dependencyManagement>

Option 3: Modify the configuration of maven-resources-plugin

set useDefaultDelimiters to true

Example:

Option 4: In the properties tag of pom, configure the following properties

 <properties>
        <resource.delimiter>${}</resource.delimiter>
    </properties>

Summarize

The essential reason why springboot makes maven-resources-plugin placeholder invalid is that springboot modifies the default placeholder of maven-resources-plugin. Why does springboot do this, his official website said the reason

The gist of it is to prevent any Spring placeholders in the configuration (eg ${foo}) from being built to extend. Therefore, it is recommended to use @

demo link

https://github.com/lyb-geek/springboot-learning/tree/master/springboot-proguard