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我试图要求在构建期间使用 maven 强制插件和RequireProperty规则定义特定属性。

我的相关部分pom.xml是这个。

<?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 http://maven.apache.org/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>test</groupId>
    <artifactId>test</artifactId>
    <version>1.0.0</version>
    <packaging>jar</packaging>


    <properties>
        <foo>bar</foo>
    </properties>


    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-enforcer-plugin</artifactId>
                <version>3.0.0-M1</version>
                <executions>
                    <execution>
                        <id>require-properties</id>
                        <goals><goal>enforce</goal></goals>
                        <configuration>
                            <rules>
                                <requireProperty>
                                    <property>${foo}</property>
                                    <message>foo must be defined -${foo}-</message>
                                </requireProperty>
                            </rules>
                            <!-- Disabling, since it seems to not notice properties that are defined -->
                            <!-- <skip>true</skip> -->
                        </configuration>
                    </execution>
                </executions>
            </plugin>

        </plugins>
    </build>
</project>

当我运行它时，执行器规则失败。

$ mvn install 
[INFO] Scanning for projects...
[INFO] 
[INFO] -----------------------------< test:test >------------------------------
[INFO] Building test 1.0.0
[INFO] --------------------------------[ jar ]---------------------------------
[INFO] 
[INFO] --- maven-enforcer-plugin:3.0.0-M1:enforce (require-properties) @ test ---
[WARNING] Rule 0: org.apache.maven.plugins.enforcer.RequireProperty failed with message:
foo must be defined -bar-
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  0.398 s
[INFO] Finished at: 2019-03-15T11:45:58-04:00
[INFO] ------------------------------------------------------------------------

如果我在命令行上定义它也会失败。

$ mvn install -Dfoo=quz
[INFO] Scanning for projects...
[INFO] 
[INFO] -----------------------------< test:test >------------------------------
[INFO] Building test 1.0.0
[INFO] --------------------------------[ jar ]---------------------------------
[INFO] 
[INFO] --- maven-enforcer-plugin:3.0.0-M1:enforce (require-properties) @ test ---
[WARNING] Rule 0: org.apache.maven.plugins.enforcer.RequireProperty failed with message:
foo must be defined -quz-
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------

这条规则不是为了<properties>价值观吗？从消息中可以清楚地看出该值是实际设置的。

我也尝试添加<regex>.*</regex>没有效果。

如何检查是否设置了 Maven 属性？

真实案例详情

在示例中，属性是在 pom 中定义的，因此包含检查有点多余。在实际情况下，插件在父 pom 中定义，属性在叶 pom 中定义。实际情况下的行为是相同的。

mvn-版本

Apache Maven 3.6.0 (97c98ec64a1fdfee7767ce5ffb20918da4f719f3; 2018-10-24T14:41:47-04:00) Maven 主页：/usr/local/Cellar/maven/3.6.0/libexec Java 版本：10.0.1，供应商：Oracle Corporation ，运行时：/Library/Java/JavaVirtualMachines/jdk-10.0.1.jdk/Contents/Home 默认语言环境：en_US，平台编码：UTF-8 操作系统名称：“mac os x”，版本：“10.14.3”，arch ：“x86_64”，家庭：“mac”

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