在 Gradle processResources 期间扩展 application.yml 给出 MissingPropertyException

Question

为了替换我的 Spring 引导 application.yml 中的属性，我添加了：

processResources {
    filesMatching("**/application.yml") {
        expand(project.properties)
    }
}

替换失败但给出 MissingPropertyException:

Caused by: groovy.lang.MissingPropertyException: No such property: OPENSHIFT_MYSQL_DB_HOST for class: SimpleTemplateScript1
        at SimpleTemplateScript1.run(SimpleTemplateScript1.groovy:49)
        at org.gradle.api.internal.file.copy.FilterChain.transform(FilterChain.java:95)
        at org.gradle.api.internal.file.copy.FilterChain.transform(FilterChain.java:84)
        at org.gradle.api.internal.ChainingTransformer.transform(ChainingTransformer.java:37)
        at org.gradle.api.internal.file.copy.FilterChain.transform(FilterChain.java:39)
        at org.gradle.api.internal.file.copy.FilterChain.transform(FilterChain.java:46)
        at org.gradle.api.internal.file.copy.DefaultFileCopyDetails.open(DefaultFileCopyDetails.java:86)
        at org.gradle.api.internal.file.AbstractFileTreeElement.copyTo(AbstractFileTreeElement.java:56)
        at org.gradle.api.internal.file.copy.DefaultFileCopyDetails.copyTo(DefaultFileCopyDetails.java:94)
        at org.gradle.api.internal.file.AbstractFileTreeElement.copyFile(AbstractFileTreeElement.java:93)
        at org.gradle.api.internal.file.AbstractFileTreeElement.copyTo(AbstractFileTreeElement.java:74)
        ... 81 more

最初我的 application.yml 包含：

url: jdbc:mysql://${OPENSHIFT_MYSQL_DB_HOST}:${OPENSHIFT_MYSQL_DB_PORT}/${OPENSHIFT_APP_NAME}

请注意，这些 Openshift 变量仅在 Openshift 生产环境中知道，但在运行本地开发模式下则不知道。

如 http://www.gradle.org/docs/current/dsl/org.gradle.api.tasks.Copy.html 所述：You can also include arbitrary Groovy code in the file, such as ${version ?: 'unknown'} 所以我将 application.yml 更改为：

url: jdbc:mysql://${OPENSHIFT_MYSQL_DB_HOST ?: ''}:${OPENSHIFT_MYSQL_DB_PORT ?: ''}/${OPENSHIFT_APP_NAME ?: ''}

但这给出了相同的 MissingPropertyException。我在这里遗漏了什么吗？

Answer 1

Gradle expand ${..} 样式与相同的 Spring 属性占位符样式冲突，因此需要像 ${..} 一样进行转义. 现在已将其添加到 Spring 引导文档：https://github.com/spring-projects/spring-boot/commit/c0c67f2593dbfd17aa304b43f4da3a3678fa58eb

在 Gradle processResources 期间扩展 application.yml 给出 MissingPropertyException

Expanding application.yml during Gradle processResources gives MissingPropertyException

gradle

spring-boot