Multiproject builds: Exception in thread "Thread-x" java.lang.IllegalStateException: The configuration ... was resolved from a thread not managed by Gradle.

[michaelzangl]

This happens when having a multi-Projet build and using the build file:

plugins {
    war
    id("org.akhikhl.gretty") version "2.0.0"
}

dependencies {
    runtimeOnly(project(":<other project name>"))
}

Exception is:

Exception in thread "Thread-190" java.lang.IllegalStateException: The configuration :<other project>:runtimeClasspath was resolved from a thread not managed by Gradle.
	at org.gradle.api.internal.artifacts.configurations.DefaultConfiguration.resolveToStateOrLater(DefaultConfiguration.java:565)
	at org.gradle.api.internal.artifacts.configurations.DefaultConfiguration.access$1900(DefaultConfiguration.java:141)
	at org.gradle.api.internal.artifacts.configurations.DefaultConfiguration$ConfigurationFileCollection.getSelectedArtifacts(DefaultConfiguration.java:1246)
	at org.gradle.api.internal.artifacts.configurations.DefaultConfiguration$ConfigurationFileCollection.visitContents(DefaultConfiguration.java:1237)
	at org.gradle.api.internal.artifacts.configurations.DefaultConfiguration$ConfigurationFileCollection.getFiles(DefaultConfiguration.java:1226)
	at org.gradle.api.internal.file.AbstractFileCollection.iterator(AbstractFileCollection.java:97)
	at org.gradle.api.internal.artifacts.configurations.DefaultConfiguration.iterator(DefaultConfiguration.java:479)
	at com.google.common.collect.ImmutableCollection$Builder.addAll(ImmutableCollection.java:405)
	at com.google.common.collect.ImmutableCollection$ArrayBasedBuilder.addAll(ImmutableCollection.java:497)
	at com.google.common.collect.ImmutableSet$Builder.addAll(ImmutableSet.java:517)
	at org.gradle.api.internal.file.CompositeFileCollection.getFiles(CompositeFileCollection.java:79)
	at org.gradle.api.internal.file.CompositeFileCollection.getFiles(CompositeFileCollection.java:53)
	at sun.reflect.GeneratedMethodAccessor176.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:101)
	at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:323)
	at org.codehaus.groovy.runtime.metaclass.MethodMetaProperty$GetBeanMethodMetaProperty.getProperty(MethodMetaProperty.java:76)
	at org.codehaus.groovy.runtime.callsite.GetEffectivePojoPropertySite.getProperty(GetEffectivePojoPropertySite.java:63)
	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callGetProperty(AbstractCallSite.java:298)
	at org.akhikhl.gretty.scanner.BaseScannerManager.collectScanDirs(BaseScannerManager.groovy:67)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:101)
	at org.codehaus.groovy.runtime.callsite.StaticMetaMethodSite$StaticMetaMethodSiteNoUnwrapNoCoerce.invoke(StaticMetaMethodSite.java:149)
	at org.codehaus.groovy.runtime.callsite.StaticMetaMethodSite.callStatic(StaticMetaMethodSite.java:100)
	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callStatic(AbstractCallSite.java:224)
	at org.akhikhl.gretty.scanner.BaseScannerManager.getEffectiveScanDirs(BaseScannerManager.groovy:107)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.codehaus.groovy.runtime.callsite.PlainObjectMetaMethodSite.doInvoke(PlainObjectMetaMethodSite.java:43)
	at org.codehaus.groovy.runtime.callsite.PogoMetaMethodSite$PogoCachedMethodSiteNoUnwrapNoCoerce.invoke(PogoMetaMethodSite.java:190)
	at org.codehaus.groovy.runtime.callsite.PogoMetaMethodSite.callCurrent(PogoMetaMethodSite.java:58)
	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:160)
	at org.akhikhl.gretty.JettyScannerManager.startScanner(JettyScannerManager.groovy:60)
	at org.akhikhl.gretty.ScannerManager$startScanner.call(Unknown Source)
	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callSafe(AbstractCallSite.java:82)
	at org.akhikhl.gretty.DefaultLauncher.beforeJavaExec(DefaultLauncher.groovy:52)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:101)
	at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:323)
	at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:351)
	at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.callCurrent(PogoMetaClassSite.java:64)
	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:160)
	at org.akhikhl.gretty.LauncherBase$_launchThread_closure4.doCall(LauncherBase.groovy:240)
	at org.akhikhl.gretty.LauncherBase$_launchThread_closure4.doCall(LauncherBase.groovy)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:101)
	at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:323)
	at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:263)
	at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1041)
	at groovy.lang.Closure.call(Closure.java:405)
	at groovy.lang.Closure.call(Closure.java:399)
	at groovy.lang.Closure.run(Closure.java:486)
	at java.lang.Thread.run(Thread.java:748)

Workaround: Add this to your build.gradle.kts

afterEvaluate {
    tasks.named<DefaultTask>("prepareInplaceWebApp") {
        doFirst {
            configurations.filter { it.isCanBeResolved }.forEach {
                // This will force the configuration to be resolved in a Gradle thread
                it.files
            }
        }
    }
}

[tonowie]

Got the same error with single-project build

The configuration :runtimeClasspath was resolved from a thread not managed by Gradle.

This project appears to be dead though :(

[boris-petrov]

@michaelzangl, @tonowie - This issue, and a bunch more, have been fixed in a Gretty fork.