spring - 如果 Spring Boot 的属性文件中未提供占位符值，如何跳过？

Question

我有一个使用 gradle 的 Spring Boot 应用程序。我已将 gradle 配置为将构建参数注入(inject) application.properties。

这是我的 gradle 片段。

processResources {
    expand project.properties
}

在 application.properties ，我有以下值(value)观

service.name=${name}
service.version=${version}

name 和 version 是将被注入(inject)的 gradle 的属性。

当我运行 ./gradlew bootRun 或 ./gradlew build 时，我看到 application.properties 文件被替换为正确的值。

但是，当我从 Intellij 开始使用 springBoot Runner 时，出现以下错误。

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'Controller': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private java.lang.String com.company.foo.web.Controller.version; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'version' in string value "${version}"
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:334) ~[spring-beans-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1214) ~[spring-beans-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:543) ~[spring-beans-4.2.7.RELEASE.jar:4.2.7.RELEASE]

当我按如下方式替换 application.properties 时，它在 intellij 的 spring boot runner 中工作，但 gradle 构建失败

 service.name=${name: not configured}
    service.version=${version : not configured}

如何告诉 spring boot 忽略任何丢失的占位符值？

stacktrace 的 gradle 异常

异常(exception)是:

org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':processResources'.
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:69)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:46)
    at org.gradle.api.internal.tasks.execution.PostExecutionAnalysisTaskExecuter.execute(PostExecutionAnalysisTaskExecuter.java:35)
    at org.gradle.api.internal.tasks.execution.SkipUpToDateTaskExecuter.execute(SkipUpToDateTaskExecuter.java:68)
    at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:58)
    at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java:52)
    at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:52)
    at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:53)
    at org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecuter.execute(ExecuteAtMostOnceTaskExecuter.java:43)
    at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:203)
    at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:185)
    at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.processTask(AbstractTaskPlanExecutor.java:66)
    at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.run(AbstractTaskPlanExecutor.java:50)
    at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor.process(DefaultTaskPlanExecutor.java:25)
    at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter.execute(DefaultTaskGraphExecuter.java:110)
    at org.gradle.execution.SelectedTaskExecutionAction.execute(SelectedTaskExecutionAction.java:37)
    at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:37)
    at org.gradle.execution.DefaultBuildExecuter.access$000(DefaultBuildExecuter.java:23)
    at org.gradle.execution.DefaultBuildExecuter$1.proceed(DefaultBuildExecuter.java:43)
    at org.gradle.execution.DryRunBuildExecutionAction.execute(DryRunBuildExecutionAction.java:32)
    at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:37)
    at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:30)
    at org.gradle.initialization.DefaultGradleLauncher$4.run(DefaultGradleLauncher.java:154)
    at org.gradle.internal.Factories$1.create(Factories.java:22)
    at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:90)
    at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:52)
    at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:151)
    at org.gradle.initialization.DefaultGradleLauncher.access$200(DefaultGradleLauncher.java:32)
    at org.gradle.initialization.DefaultGradleLauncher$1.create(DefaultGradleLauncher.java:99)
    at org.gradle.initialization.DefaultGradleLauncher$1.create(DefaultGradleLauncher.java:93)
    at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:90)
    at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:62)
    at org.gradle.initialization.DefaultGradleLauncher.doBuild(DefaultGradleLauncher.java:93)
    at org.gradle.initialization.DefaultGradleLauncher.run(DefaultGradleLauncher.java:82)
    at org.gradle.launcher.exec.InProcessBuildActionExecuter$DefaultBuildController.run(InProcessBuildActionExecuter.java:94)
    at org.gradle.tooling.internal.provider.ExecuteBuildActionRunner.run(ExecuteBuildActionRunner.java:28)
    at org.gradle.launcher.exec.ChainingBuildActionRunner.run(ChainingBuildActionRunner.java:35)
    at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:43)
    at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:28)
    at org.gradle.launcher.exec.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:81)
    at org.gradle.launcher.exec.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:46)
    at org.gradle.launcher.exec.DaemonUsageSuggestingBuildActionExecuter.execute(DaemonUsageSuggestingBuildActionExecuter.java:51)
    at org.gradle.launcher.exec.DaemonUsageSuggestingBuildActionExecuter.execute(DaemonUsageSuggestingBuildActionExecuter.java:28)
    at org.gradle.launcher.cli.RunBuildAction.run(RunBuildAction.java:43)
    at org.gradle.internal.Actions$RunnableActionAdapter.execute(Actions.java:173)
    at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineActionFactory.java:241)
    at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineActionFactory.java:214)
    at org.gradle.launcher.cli.JavaRuntimeValidationAction.execute(JavaRuntimeValidationAction.java:35)
    at org.gradle.launcher.cli.JavaRuntimeValidationAction.execute(JavaRuntimeValidationAction.java:24)
    at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFactory.java:207)
    at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFactory.java:169)
    at org.gradle.launcher.cli.ExceptionReportingAction.execute(ExceptionReportingAction.java:33)
    at org.gradle.launcher.cli.ExceptionReportingAction.execute(ExceptionReportingAction.java:22)
    at org.gradle.launcher.Main.doAction(Main.java:33)
    at org.gradle.launcher.bootstrap.EntryPoint.run(EntryPoint.java:45)
    at org.gradle.launcher.bootstrap.ProcessBootstrap.runNoExit(ProcessBootstrap.java:55)
    at org.gradle.launcher.bootstrap.ProcessBootstrap.run(ProcessBootstrap.java:36)
    at org.gradle.launcher.GradleMain.main(GradleMain.java:23)
    at org.gradle.wrapper.BootstrapMainStarter.start(BootstrapMainStarter.java:30)
    at org.gradle.wrapper.WrapperExecutor.execute(WrapperExecutor.java:129)
    at org.gradle.wrapper.GradleWrapperMain.main(GradleWrapperMain.java:61)
Caused by: org.gradle.api.GradleException: Could not copy file '/Users/Documents/proj/src/main/resources/application.properties' to '/Users/Documents/proj/build/resources/main/application.properties'.
    at org.gradle.api.internal.file.AbstractFileTreeElement.copyTo(AbstractFileTreeElement.java:79)
    at org.gradle.api.internal.file.copy.DefaultFileCopyDetails.copyTo(DefaultFileCopyDetails.java:102)
    at org.gradle.api.internal.file.copy.FileCopyAction$FileCopyDetailsInternalAction.processFile(FileCopyAction.java:44)
    at org.gradle.api.internal.file.copy.NormalizingCopyActionDecorator$1$1.processFile(NormalizingCopyActionDecorator.java:65)
    at org.gradle.api.internal.file.copy.DuplicateHandlingCopyActionDecorator$1$1.processFile(DuplicateHandlingCopyActionDecorator.java:60)
    at org.gradle.api.internal.file.copy.CopyFileVisitorImpl.processFile(CopyFileVisitorImpl.java:60)
    at org.gradle.api.internal.file.copy.CopyFileVisitorImpl.visitFile(CopyFileVisitorImpl.java:44)
    at org.gradle.api.internal.file.collections.jdk7.Jdk7DirectoryWalker$1.visitFile(Jdk7DirectoryWalker.java:81)
    at org.gradle.api.internal.file.collections.jdk7.Jdk7DirectoryWalker$1.visitFile(Jdk7DirectoryWalker.java:54)
    at org.gradle.api.internal.file.collections.jdk7.Jdk7DirectoryWalker.walkDir(Jdk7DirectoryWalker.java:54)
    at org.gradle.api.internal.file.collections.DirectoryFileTree.walkDir(DirectoryFileTree.java:146)
    at org.gradle.api.internal.file.collections.DirectoryFileTree.visitFrom(DirectoryFileTree.java:130)
    at org.gradle.api.internal.file.collections.DirectoryFileTree.visit(DirectoryFileTree.java:115)
    at org.gradle.api.internal.file.collections.FileTreeAdapter.visit(FileTreeAdapter.java:109)
    at org.gradle.api.internal.file.CompositeFileTree.visit(CompositeFileTree.java:58)
    at org.gradle.api.internal.file.copy.CopySpecActionImpl.execute(CopySpecActionImpl.java:37)
    at org.gradle.api.internal.file.copy.CopySpecActionImpl.execute(CopySpecActionImpl.java:24)
    at org.gradle.api.internal.file.copy.DefaultCopySpec$DefaultCopySpecResolver.walk(DefaultCopySpec.java:498)
    at org.gradle.api.internal.file.copy.DefaultCopySpec$DefaultCopySpecResolver.walk(DefaultCopySpec.java:500)
    at org.gradle.api.internal.file.copy.DefaultCopySpec.walk(DefaultCopySpec.java:322)
    at org.gradle.api.internal.file.copy.DelegatingCopySpecInternal.walk(DelegatingCopySpecInternal.java:206)
    at org.gradle.api.internal.file.copy.CopySpecBackedCopyActionProcessingStream.process(CopySpecBackedCopyActionProcessingStream.java:36)
    at org.gradle.api.internal.file.copy.DuplicateHandlingCopyActionDecorator$1.process(DuplicateHandlingCopyActionDecorator.java:44)
    at org.gradle.api.internal.file.copy.NormalizingCopyActionDecorator$1.process(NormalizingCopyActionDecorator.java:56)
    at org.gradle.api.internal.file.copy.FileCopyAction.execute(FileCopyAction.java:35)
    at org.gradle.api.internal.file.copy.NormalizingCopyActionDecorator.execute(NormalizingCopyActionDecorator.java:52)
    at org.gradle.api.internal.file.copy.DuplicateHandlingCopyActionDecorator.execute(DuplicateHandlingCopyActionDecorator.java:42)
    at org.gradle.api.internal.file.copy.CopyActionExecuter.execute(CopyActionExecuter.java:38)
    at org.gradle.api.tasks.AbstractCopyTask.copy(AbstractCopyTask.java:83)
    at org.gradle.language.jvm.tasks.ProcessResources.copy(ProcessResources.java:35)
    at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:75)
    at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.doExecute(AnnotationProcessingTaskFactory.java:228)
    at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.execute(AnnotationProcessingTaskFactory.java:221)
    at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.execute(AnnotationProcessingTaskFactory.java:210)
    at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:585)
    at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:568)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeAction(ExecuteActionsTaskExecuter.java:80)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:61)
    ... 60 more
Caused by: groovy.lang.MissingPropertyException: No such property: configured for class: SimpleTemplateScript1
    at SimpleTemplateScript1$_run_closure1.doCall(SimpleTemplateScript1.groovy:3)
    at SimpleTemplateScript1$_run_closure1.doCall(SimpleTemplateScript1.groovy)
    at SimpleTemplateScript1.run(SimpleTemplateScript1.groovy:3)
    at org.gradle.api.internal.file.copy.FilterChain$3.transform(FilterChain.java:95)
    at org.gradle.api.internal.file.copy.FilterChain$3.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)
    ... 97 more


BUILD FAILED

编辑

public class Controller {

@Value("${service.name: not configured}")
String name;

@Value("${service.version: not configured}")
String version

//rest of code

}

Answer 1

我通过在 application.yml 中添加以下内容解决了这个问题:

${version?:unknown}

它也适用于 cli: gradle 引导运行 也来自 IntelliJ 和你 不要必须在 IntelliJ 中启动之前调用 Gradle 任务 processResources 或使用 spring 配置文件。

这项工作与 Gradle 版本: 4.6 还有 Spring Boot 版本: 2.0.1.发布 .
希望能帮助到你 ;)