带有资源的spring boot应用程序的mvn包，总是重新打包整个应用程序

Question

在具有资源目录的 Spring Boot 应用程序上运行“mvn package”，即使没有对源代码进行任何修改，也总是会重新打包整个模块。

要重现此问题，请运行以下说明：

• git 克隆https://github.com/spring-guides/gs-spring-boot.git
• cd gs-spring-boot/initial
• mvn 包
• ls -l --time-style='+%d-%m-%Y %H:%M:%S' 目标/*.jar
  • -rw-rw-r-- 1 mario mario 16224690 08-02-2019 00:19:37 目标/gs-spring-boot-0.1.0.jar
• mvn 包
• ls -l --time-style='+%d-%m-%Y %H:%M:%S' 目标/*.jar
  • -rw-rw-r-- 1 mario mario 16224690 08-02-2019 00:19:37 target/gs-spring-boot-0.1.0.jar（同日：OK）

现在添加一个资源目录和一个 application.properties 文件：

• mkdir src/main/resources
• 触摸 src/main/resources/application.properties

然后重新运行测试：

• mvn 包

• ls -l --time-style='+%d-%m-%Y %H:%M:%S' 目标/*.jar

  • -rw-rw-r-- 1 mario mario 16225034 08-02-2019 00:29:09 目标/gs-spring-boot-0.1.0.jar

• 等几秒钟

• mvn 包

• ls -l --time-style='+%d-%m-%Y %H:%M:%S' 目标/*.jar
  • -rw-rw-r-- 1 mario mario 16225034 08-02-2019 00:29:43 target/gs-spring-boot-0.1.0.jar (NOK)

Maven 输出是这样的：

mario@PRS-NB-005# mvn package
[INFO] Scanning for projects...
[INFO] 
[INFO] ------------------------------------------------------------------------
[INFO] Building gs-spring-boot 0.1.0
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] --- maven-resources-plugin:3.0.2:resources (default-resources) @ gs-spring-boot ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 1 resource
[INFO] Copying 0 resource
[INFO] 
[INFO] --- maven-compiler-plugin:3.7.0:compile (default-compile) @ gs-spring-boot ---
[INFO] Nothing to compile - all classes are up to date
[INFO] 
[INFO] --- maven-resources-plugin:3.0.2:testResources (default-testResources) @ gs-spring-boot ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory /mario/prj/web/bbb/gs-spring-boot/initial/src/test/resources
[INFO] 
[INFO] --- maven-compiler-plugin:3.7.0:testCompile (default-testCompile) @ gs-spring-boot ---
[INFO] No sources to compile
[INFO] 
[INFO] --- maven-surefire-plugin:2.21.0:test (default-test) @ gs-spring-boot ---
[INFO] No tests to run.
[INFO] 
[INFO] --- maven-jar-plugin:3.0.2:jar (default-jar) @ gs-spring-boot ---
[INFO] Building jar: /mario/prj/web/bbb/gs-spring-boot/initial/target/gs-spring-boot-0.1.0.jar
[INFO] 
[INFO] --- spring-boot-maven-plugin:2.0.5.RELEASE:repackage (default) @ gs-spring-boot ---
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.337 s
[INFO] Finished at: 2019-02-08T00:29:43+01:00
[INFO] Final Memory: 22M/308M
[INFO] ------------------------------------------------------------------------

Answer 1

看看有效的 pom. 在那里您将看到以下内容：

<build>
    ...
    <resources>
        <resource>
            <filtering>true</filtering>
            <directory>path/gs-spring-boot/initial/src/main/resources</directory>
            <includes>
                <include>**/application*.yml</include>
                <include>**/application*.yaml</include>
                <include>**/application*.properties</include>
            </includes>
        </resource>
       ...

因为<filtering>true</filtering> 它使用每个mvn package 创建jar。

此配置来自：

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.0.5.RELEASE</version>
</parent>

如果您不需要过滤您的 application.properties，您可以在 pom.xml 中从初始位置覆盖。