Evaluation order of files

I have got a multi Project build. Inside my root Project there is a commons.gradle file which contains this:

jar {
    manifest {
        attributes("Built-By": project.vendor)
    }
}

this file is applied to all subprojects by the Root-Projects build.gradle like this.

subprojects {
    apply from: rootProject.file('common.gradle')
}

project.vendor is set inside the Child-Projects build.gradle like

ext {
    vendor='My Team'
}

executing gradlew jar says the property project.vendor is not found. The Stacktrace is:

FAILURE: Build failed with an exception.

* Where:
Script 'X:\new_workspace\KSC\common.gradle' line: 56

* What went wrong:
A problem occurred evaluating script.
> Could not find property 'vendor' on project ':Images'.

* Try:
Run with --info or --debug option to get more log output.

* Exception is:
org.gradle.api.GradleScriptException: A problem occurred evaluating script.
        at org.gradle.groovy.scripts.internal.DefaultScriptRunnerFactory$ScriptRunnerImpl.run(DefaultScriptRunnerFactory.java:93)
        at org.gradle.configuration.DefaultScriptPluginFactory$ScriptPluginImpl$2.run(DefaultScriptPluginFactory.java:157)
        at org.gradle.configuration.DefaultScriptTarget.addConfiguration(DefaultScriptTarget.java:69)
        at org.gradle.configuration.DefaultScriptPluginFactory$ScriptPluginImpl.apply(DefaultScriptPluginFactory.java:162)
        at org.gradle.api.internal.plugins.DefaultObjectConfigurationAction.applyScript(DefaultObjectConfigurationAction.java:102)
        at org.gradle.api.internal.plugins.DefaultObjectConfigurationAction.access$000(DefaultObjectConfigurationAction.java:36)
        at org.gradle.api.internal.plugins.DefaultObjectConfigurationAction$1.run(DefaultObjectConfigurationAction.java:62)
        at org.gradle.api.internal.plugins.DefaultObjectConfigurationAction.execute(DefaultObjectConfigurationAction.java:136)
        at org.gradle.api.internal.project.AbstractPluginAware.apply(AbstractPluginAware.java:46)
        at build_6an58ujmotcdva8j1dqetjw2e$_run_closure1.doCall(X:\new_workspace\KSC\build.gradle:6)
        at org.gradle.api.internal.ClosureBackedAction.execute(ClosureBackedAction.java:67)
        at org.gradle.util.ConfigureUtil.configure(ConfigureUtil.java:130)
        at org.gradle.util.ConfigureUtil.configure(ConfigureUtil.java:91)
        at org.gradle.api.internal.project.AbstractProject.configure(AbstractProject.java:873)
        at org.gradle.api.internal.project.AbstractProject.configure(AbstractProject.java:878)
        at org.gradle.api.internal.project.AbstractProject.subprojects(AbstractProject.java:861)
        at org.gradle.api.internal.BeanDynamicObject$MetaClassAdapter.invokeMethod(BeanDynamicObject.java:236)
        at org.gradle.api.internal.BeanDynamicObject.invokeMethod(BeanDynamicObject.java:130)
        at org.gradle.api.internal.CompositeDynamicObject.invokeMethod(CompositeDynamicObject.java:150)
        at org.gradle.groovy.scripts.BasicScript.methodMissing(BasicScript.java:79)
        at build_6an58ujmotcdva8j1dqetjw2e.run(X:\new_workspace\KSC\build.gradle:5)
        at org.gradle.groovy.scripts.internal.DefaultScriptRunnerFactory$ScriptRunnerImpl.run(DefaultScriptRunnerFactory.java:91)
        at org.gradle.configuration.DefaultScriptPluginFactory$ScriptPluginImpl$2.run(DefaultScriptPluginFactory.java:157)
        at org.gradle.configuration.ProjectScriptTarget.addConfiguration(ProjectScriptTarget.java:72)
        at org.gradle.configuration.DefaultScriptPluginFactory$ScriptPluginImpl.apply(DefaultScriptPluginFactory.java:162)
        at org.gradle.configuration.project.BuildScriptProcessor.execute(BuildScriptProcessor.java:38)
        at org.gradle.configuration.project.BuildScriptProcessor.execute(BuildScriptProcessor.java:25)
        at org.gradle.configuration.project.ConfigureActionsProjectEvaluator.evaluate(ConfigureActionsProjectEvaluator.java:34)
        at org.gradle.configuration.project.LifecycleProjectEvaluator.evaluate(LifecycleProjectEvaluator.java:55)
        at org.gradle.api.internal.project.AbstractProject.evaluate(AbstractProject.java:529)
        at org.gradle.api.internal.project.AbstractProject.evaluate(AbstractProject.java:90)
        at org.gradle.execution.TaskPathProjectEvaluator.configureHierarchy(TaskPathProjectEvaluator.java:42)
        at org.gradle.configuration.DefaultBuildConfigurer.configure(DefaultBuildConfigurer.java:35)
        at org.gradle.initialization.DefaultGradleLauncher$2.run(DefaultGradleLauncher.java:125)
        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:122)
        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$WithLogging.execute(CommandLineActionFactory.java:169)
        at org.gradle.launcher.cli.ExceptionReportingAction.execute(ExceptionReportingAction.java:33)
        at org.gradle.launcher.cli.ExceptionReportingAction.execute(ExceptionReportingAction.java:22)
        at org.gradle.launcher.Main.doAction(Main.java:33)
        at org.gradle.launcher.bootstrap.EntryPoint.run(EntryPoint.java:45)
        at org.gradle.launcher.bootstrap.ProcessBootstrap.runNoExit(ProcessBootstrap.java:55)
        at org.gradle.launcher.bootstrap.ProcessBootstrap.run(ProcessBootstrap.java:36)
        at org.gradle.launcher.GradleMain.main(GradleMain.java:23)
        at org.gradle.wrapper.BootstrapMainStarter.start(BootstrapMainStarter.java:30)
        at org.gradle.wrapper.WrapperExecutor.execute(WrapperExecutor.java:129)
        at org.gradle.wrapper.GradleWrapperMain.main(GradleWrapperMain.java:61)
Caused by: groovy.lang.MissingPropertyException: Could not find property 'vendor' on project ':Images'.
        at org.gradle.api.internal.AbstractDynamicObject.propertyMissingException(AbstractDynamicObject.java:43)
        at org.gradle.api.internal.AbstractDynamicObject.getProperty(AbstractDynamicObject.java:35)
        at org.gradle.api.internal.CompositeDynamicObject.getProperty(CompositeDynamicObject.java:97)
        at org.gradle.api.internal.project.DefaultProject_Decorated.getProperty(Unknown Source)
        at common_1uemmns0ytoep4uethbbhl34j$_run_closure4$_closure10.doCall(X:\new_workspace\KSC\common.gradle:56)
        at org.gradle.api.internal.ClosureBackedAction.execute(ClosureBackedAction.java:67)
        at org.gradle.util.ConfigureUtil.configure(ConfigureUtil.java:130)
        at org.gradle.util.ConfigureUtil.configure(ConfigureUtil.java:91)
        at org.gradle.jvm.tasks.Jar.manifest(Jar.java:111)
        at org.gradle.api.tasks.bundling.Jar.super$8$manifest(Jar.groovy)
        at org.gradle.api.tasks.bundling.Jar.manifest(Jar.groovy:29)
        at org.gradle.api.tasks.bundling.Jar_Decorated.manifest(Unknown Source)
        at common_1uemmns0ytoep4uethbbhl34j$_run_closure4.doCall(X:\new_workspace\KSC\common.gradle:55)
        at org.gradle.api.internal.ClosureBackedAction.execute(ClosureBackedAction.java:67)
        at org.gradle.util.ConfigureUtil.configure(ConfigureUtil.java:130)
        at org.gradle.util.ConfigureUtil.configure(ConfigureUtil.java:110)
        at org.gradle.api.internal.AbstractTask.configure(AbstractTask.java:488)
        at org.gradle.api.internal.AbstractTask.configure(AbstractTask.java:58)
        at org.gradle.api.internal.ClosureBackedAction.execute(ClosureBackedAction.java:59)
        at org.gradle.util.ConfigureUtil.configure(ConfigureUtil.java:130)
        at org.gradle.util.ConfigureUtil.configure(ConfigureUtil.java:91)
        at org.gradle.api.internal.DefaultNamedDomainObjectCollection$ContainerElementsDynamicObject.invokeMethod(DefaultNamedDomainObjectCollection.java:341)
        at org.gradle.api.internal.CompositeDynamicObject.invokeMethod(CompositeDynamicObject.java:150)
        at org.gradle.groovy.scripts.BasicScript.methodMissing(BasicScript.java:79)
        at common_1uemmns0ytoep4uethbbhl34j.run(X:\new_workspace\KSC\common.gradle:54)
        at org.gradle.groovy.scripts.internal.DefaultScriptRunnerFactory$ScriptRunnerImpl.run(DefaultScriptRunnerFactory.java:91)
        ... 71 more


BUILD FAILED

Total time: 4.415 secs

What am i doing wrong and how can i fix it?
I hope you can help me. I’d be greatfull for any kind of help.

Parents are evaluated before chichildren. Thus the logic in the script plugin needs to be lazy, e.g. by using a GString: "${project.vendor}"