NoClassDefFoundError: Could not initialize class org.eclipse.buildship.ui.internal.console.ConsoleProcessStreamsProvider$BackgroundJobProcessStream

[jmini]

Expected Behavior

I can import my gradle projects correctly. Without error.

Current Behavior

When I import my gradle project (multi modules gradle build) by selecting the root of the repo where they are located, then the import fails.
I just get one project imported (with the name of the root folder of the repo).

When if I hit "Refresh Gradle project" from the context menu later on it fails with the same error.

Your Environment

Eclipse Version: Version: 2021-03 (4.19.0), Build id: 20210312-0638 (updated with the eclipse installer. A.k.a Oomph)
Buildship: Eclipse Plug-ins for Gradle 3.1.5.v20210113-0929 (also installed automatically with the installer)

Gradle version of the project:

------------------------------------------------------------
Gradle 6.7.1
------------------------------------------------------------

Build time:   2020-11-16 17:09:24 UTC
Revision:     2972ff02f3210d2ceed2f1ea880f026acfbab5c0

Kotlin:       1.3.72
Groovy:       2.5.12
Ant:          Apache Ant(TM) version 1.10.8 compiled on May 10 2020
JVM:          1.8.0_202 (Azul Systems, Inc. 25.202-b05)
OS:           Mac OS X 10.15.2 x86_64

Stack-trace

Copy-pasted from the Eclispe Error log view:

com.google.common.util.concurrent.ExecutionError: java.lang.NoClassDefFoundError: Could not initialize class org.eclipse.buildship.ui.internal.console.ConsoleProcessStreamsProvider$BackgroundJobProcessStream
	at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2049)
	at com.google.common.cache.LocalCache.get(LocalCache.java:3953)
	at com.google.common.cache.LocalCache$LocalManualCache.get(LocalCache.java:4873)
	at org.eclipse.buildship.core.internal.workspace.DefaultModelProvider.getFromCache(DefaultModelProvider.java:98)
	at org.eclipse.buildship.core.internal.workspace.DefaultModelProvider.executeOperation(DefaultModelProvider.java:90)
	at org.eclipse.buildship.core.internal.workspace.DefaultModelProvider.fetchEclipseProjectAndRunSyncTasks(DefaultModelProvider.java:72)
	at org.eclipse.buildship.core.internal.DefaultGradleBuild$SynchronizeOperation.runInToolingApi(DefaultGradleBuild.java:226)
	at org.eclipse.buildship.core.internal.operation.DefaultToolingApiOperationManager$WorkspaceRunnableAdapter.run(DefaultToolingApiOperationManager.java:58)
	at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2292)
	at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2317)
	at org.eclipse.buildship.core.internal.operation.DefaultToolingApiOperationManager.run(DefaultToolingApiOperationManager.java:39)
	at org.eclipse.buildship.core.internal.DefaultGradleBuild$SynchronizeOperation.run(DefaultGradleBuild.java:192)
	at org.eclipse.buildship.core.internal.DefaultGradleBuild.synchronize(DefaultGradleBuild.java:100)
	at org.eclipse.buildship.core.internal.workspace.SynchronizationJob.runInToolingApi(SynchronizationJob.java:64)
	at org.eclipse.buildship.core.internal.workspace.SynchronizationJob.runInToolingApi(SynchronizationJob.java:30)
	at org.eclipse.buildship.core.internal.operation.ToolingApiJob$1.runInToolingApi(ToolingApiJob.java:54)
	at org.eclipse.buildship.core.internal.operation.DefaultToolingApiOperationManager$WorkspaceRunnableAdapter.run(DefaultToolingApiOperationManager.java:58)
	at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2292)
	at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2317)
	at org.eclipse.buildship.core.internal.operation.DefaultToolingApiOperationManager.run(DefaultToolingApiOperationManager.java:39)
	at org.eclipse.buildship.core.internal.operation.ToolingApiJob.run(ToolingApiJob.java:65)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63)
Caused by: java.lang.NoClassDefFoundError: Could not initialize class org.eclipse.buildship.ui.internal.console.ConsoleProcessStreamsProvider$BackgroundJobProcessStream
	at org.eclipse.buildship.ui.internal.console.ConsoleProcessStreamsProvider.getBackgroundJobProcessStreams(ConsoleProcessStreamsProvider.java:35)
	at org.eclipse.buildship.core.internal.gradle.GradleProgressAttributes$GradleProgressAttributesBuilder.build(GradleProgressAttributes.java:151)
	at org.eclipse.buildship.core.internal.util.gradle.IdeAttachedProjectConnection.newInstance(IdeAttachedProjectConnection.java:107)
	at org.eclipse.buildship.core.internal.DefaultGradleBuild$GradleConnectionOperation.runInToolingApi(DefaultGradleBuild.java:323)
	at org.eclipse.buildship.core.internal.operation.DefaultToolingApiOperationManager$WorkspaceRunnableAdapter.run(DefaultToolingApiOperationManager.java:58)
	at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2292)
	at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2317)
	at org.eclipse.buildship.core.internal.operation.DefaultToolingApiOperationManager.run(DefaultToolingApiOperationManager.java:39)
	at org.eclipse.buildship.core.internal.DefaultGradleBuild.withConnection(DefaultGradleBuild.java:122)
	at org.eclipse.buildship.core.internal.workspace.DefaultModelProvider.lambda$fetchEclipseProjectAndRunSyncTasks$5(DefaultModelProvider.java:75)
	at com.google.common.cache.LocalCache$LocalManualCache$1.load(LocalCache.java:4878)
	at com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3529)
	at com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2278)
	at com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2155)
	at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2045)
	... 21 more

I am happy to provide more info if necessary.

[jmini]

If you need a multi module project to reproduce, you can just run gradle ini (with gradle 6.7.1) it creates a multi module one:

$ mkdir tmpgradle
$ cd tmpgradle/
$ gradle init 

Select type of project to generate:
  1: basic
  2: application
  3: library
  4: Gradle plugin
Enter selection (default: basic) [1..4] 3

Select implementation language:
  1: C++
  2: Groovy
  3: Java
  4: Kotlin
  5: Scala
  6: Swift
Enter selection (default: Java) [1..6] 3

Select build script DSL:
  1: Groovy
  2: Kotlin
Enter selection (default: Groovy) [1..2] 1

Select test framework:
  1: JUnit 4
  2: TestNG
  3: Spock
  4: JUnit Jupiter
Enter selection (default: JUnit 4) [1..4] 4

Project name (default: tmpgradle): 
Source package (default: tmpgradle): 

[jmini]

Same error with a single module build (no settings.gradle)

[jmini]

As comparison, if I create this with gradle 6.7.1, inside a tmpgradle/ folder:

$ gradle init 

Select type of project to generate:
  1: basic
  2: application
  3: library
  4: Gradle plugin
Enter selection (default: basic) [1..4] 2

Select implementation language:
  1: C++
  2: Groovy
  3: Java
  4: Kotlin
  5: Scala
  6: Swift
Enter selection (default: Java) [1..6] 3

Split functionality across multiple subprojects?:
  1: no - only one application project
  2: yes - application and library projects
Enter selection (default: no - only one application project) [1..2] 2

Select build script DSL:
  1: Groovy
  2: Kotlin
Enter selection (default: Groovy) [1..2] 1

Project name (default: tmpgradle): 
Source package (default: tmpgradle): 

And I import it in an older Eclipse:

Eclipse IDE for Java Developers (includes Incubating components)

Version: 2020-12 (4.18.0)
Build id: 20201210-1552

Where Buildship: Eclipse Plug-ins for Gradle has version 3.1.4.v20200326-1743

Importing all the projects by pointing to the tmpgradle folder
It works perfectly:

[jmini]

After having read this message [eclipse.org-committers] Critical bug made it into Eclipse 4.19 (any plans on removing it or providing a new build?) and Bug 571990 I thought I could give newest build of Eclipse a try.

With:

eclipse.application=org.eclipse.ui.ide.workbench
eclipse.buildId=4.19.0.I20210303-1800

And Buildship 3.1.5.v20210113-0929, I can confirm that my simple test described in my previous #1078 (comment) is working. No error.