Code is underlined with message "cannot be resolved to a type" , but it's not true

[provide a description of the issue]
IDE is showing some classes as "cannot be resolved to a type" , but the class exists, the code compiles fine. And also every now and then typing, waiting, the error disappears and appears again.
Project : https://github.com/jonathanvila/tackle-pathfinder
Line with error now : https://github.com/jonathanvila/tackle-pathfinder/blob/508abe531f3958f9b829e4b1fbac26b2a59a5fd3/src/main/java/io/tackle/pathfinder/model/assessment/AssessmentSingleOption.java#L41

Environment

• Operating System: Fedora 33
• JDK version: OpenJDK 11.0.9
• Visual Studio Code version: 1.55.0
• Java extension version: Language Support for Java 0.76.0

Steps To Reproduce

1. Randomly it shows classes as cannot be resolved

[Please attach a sample project reproducing the error]
Project : https://github.com/jonathanvila/tackle-pathfinder
Please attach logs

LOG (today) Language Support extension :

[Error - 10:54:00] 13 Apr 2021, 10:54:00 Problems occurred when invoking code from plug-in: "org.eclipse.jdt.core".
null
java.lang.NullPointerException
at org.eclipse.lsp4mp.jdt.core.utils.JDTMicroProfileUtils.getProjectURI(JDTMicroProfileUtils.java:62)
at org.eclipse.lsp4mp.jdt.core.utils.JDTMicroProfileUtils.getProjectURI(JDTMicroProfileUtils.java:52)
at org.eclipse.lsp4mp.jdt.internal.core.MicroProfilePropertiesListenerManager$MicroProfileListener.processDelta(MicroProfilePropertiesListenerManager.java:105)
at org.eclipse.lsp4mp.jdt.internal.core.MicroProfilePropertiesListenerManager$MicroProfileListener.processDeltaChildren(MicroProfilePropertiesListenerManager.java:85)
at org.eclipse.lsp4mp.jdt.internal.core.MicroProfilePropertiesListenerManager$MicroProfileListener.processDelta(MicroProfilePropertiesListenerManager.java:95)
at org.eclipse.lsp4mp.jdt.internal.core.MicroProfilePropertiesListenerManager$MicroProfileListener.elementChanged(MicroProfilePropertiesListenerManager.java:76)
at org.eclipse.jdt.internal.core.DeltaProcessor$3.run(DeltaProcessor.java:1755)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45)
at org.eclipse.jdt.internal.core.DeltaProcessor.notifyListeners(DeltaProcessor.java:1743)
at org.eclipse.jdt.internal.core.DeltaProcessor.firePostChangeDelta(DeltaProcessor.java:1576)
at org.eclipse.jdt.internal.core.DeltaProcessor.fire(DeltaProcessor.java:1552)
at org.eclipse.jdt.internal.core.DeltaProcessor.notifyAndFire(DeltaProcessor.java:2273)
at org.eclipse.jdt.internal.core.DeltaProcessor.resourceChanged(DeltaProcessor.java:2163)
at org.eclipse.jdt.internal.core.DeltaProcessingState.resourceChanged(DeltaProcessingState.java:477)
at org.eclipse.core.internal.events.NotificationManager$1.run(NotificationManager.java:305)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45)
at org.eclipse.core.internal.events.NotificationManager.notify(NotificationManager.java:295)
at org.eclipse.core.internal.events.NotificationManager.broadcastChanges(NotificationManager.java:158)
at org.eclipse.core.internal.resources.Workspace.broadcastPostChange(Workspace.java:380)
at org.eclipse.core.internal.resources.Workspace.endOperation(Workspace.java:1502)
at org.eclipse.core.internal.resources.InternalWorkspaceJob.run(InternalWorkspaceJob.java:49)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63)

[Error - 10:54:00] 13 Apr 2021, 10:54:00 Exception occurred in listener of Java element change notification
null
java.lang.NullPointerException
at org.eclipse.lsp4mp.jdt.core.utils.JDTMicroProfileUtils.getProjectURI(JDTMicroProfileUtils.java:62)
at org.eclipse.lsp4mp.jdt.core.utils.JDTMicroProfileUtils.getProjectURI(JDTMicroProfileUtils.java:52)
at org.eclipse.lsp4mp.jdt.internal.core.MicroProfilePropertiesListenerManager$MicroProfileListener.processDelta(MicroProfilePropertiesListenerManager.java:105)
at org.eclipse.lsp4mp.jdt.internal.core.MicroProfilePropertiesListenerManager$MicroProfileListener.processDeltaChildren(MicroProfilePropertiesListenerManager.java:85)
at org.eclipse.lsp4mp.jdt.internal.core.MicroProfilePropertiesListenerManager$MicroProfileListener.processDelta(MicroProfilePropertiesListenerManager.java:95)
at org.eclipse.lsp4mp.jdt.internal.core.MicroProfilePropertiesListenerManager$MicroProfileListener.elementChanged(MicroProfilePropertiesListenerManager.java:76)
at org.eclipse.jdt.internal.core.DeltaProcessor$3.run(DeltaProcessor.java:1755)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45)
at org.eclipse.jdt.internal.core.DeltaProcessor.notifyListeners(DeltaProcessor.java:1743)
at org.eclipse.jdt.internal.core.DeltaProcessor.firePostChangeDelta(DeltaProcessor.java:1576)
at org.eclipse.jdt.internal.core.DeltaProcessor.fire(DeltaProcessor.java:1552)
at org.eclipse.jdt.internal.core.DeltaProcessor.notifyAndFire(DeltaProcessor.java:2273)
at org.eclipse.jdt.internal.core.DeltaProcessor.resourceChanged(DeltaProcessor.java:2163)
at org.eclipse.jdt.internal.core.DeltaProcessingState.resourceChanged(DeltaProcessingState.java:477)
at org.eclipse.core.internal.events.NotificationManager$1.run(NotificationManager.java:305)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45)
at org.eclipse.core.internal.events.NotificationManager.notify(NotificationManager.java:295)
at org.eclipse.core.internal.events.NotificationManager.broadcastChanges(NotificationManager.java:158)
at org.eclipse.core.internal.resources.Workspace.broadcastPostChange(Workspace.java:380)
at org.eclipse.core.internal.resources.Workspace.endOperation(Workspace.java:1502)
at org.eclipse.core.internal.resources.InternalWorkspaceJob.run(InternalWorkspaceJob.java:49)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63)

LOG ( today ) Extension host :

[2021-04-13 10:59:48.903] [exthost] [error] [redhat.java] provider FAILED
[2021-04-13 10:59:48.903] [exthost] [error] Error: The request (id: 190057, method: 'textDocument/hover') has been cancelled
at /home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:76464
at /home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:76758
at Immediate. (/home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:77117)
at processImmediate (internal/timers.js:456:21)
[2021-04-13 10:59:52.521] [exthost] [error] [redhat.java] provider FAILED
[2021-04-13 10:59:52.521] [exthost] [error] Error: The request (id: 190077, method: 'textDocument/hover') has been cancelled
at /home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:76464
at /home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:76758
at Immediate. (/home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:77117)
at processImmediate (internal/timers.js:456:21)
[2021-04-13 11:02:12.706] [exthost] [error] [redhat.java] provider FAILED
[2021-04-13 11:02:12.706] [exthost] [error] Error: The request (id: 190239, method: 'textDocument/hover') has been cancelled
at /home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:76464
at /home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:76758
at Immediate. (/home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:77117)
at processImmediate (internal/timers.js:456:21)
[2021-04-13 11:02:53.107] [exthost] [error] [redhat.java] provider FAILED
[2021-04-13 11:02:53.107] [exthost] [error] Error: The request (id: 190389, method: 'textDocument/hover') has been cancelled
at /home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:76464
at /home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:76758
at Immediate. (/home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:77117)
at processImmediate (internal/timers.js:456:21)
[2021-04-13 11:04:18.872] [exthost] [error] [redhat.java] provider FAILED
[2021-04-13 11:04:18.873] [exthost] [error] Error: The request (id: 190531, method: 'textDocument/hover') has been cancelled
at /home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:76464
at /home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:76758
at Immediate. (/home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:77117)
at processImmediate (internal/timers.js:456:21)
[2021-04-13 11:06:43.284] [exthost] [error] [redhat.java] provider FAILED
[2021-04-13 11:06:43.284] [exthost] [error] Error: The request (id: 190841, method: 'textDocument/hover') has been cancelled
at /home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:76464
at /home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:76758
at Immediate. (/home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:77117)
at processImmediate (internal/timers.js:456:21)
[2021-04-13 11:06:43.288] [exthost] [error] [redhat.java] provider FAILED
[2021-04-13 11:06:43.288] [exthost] [error] Error: The request (id: 190845, method: 'textDocument/hover') has been cancelled
at /home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:76464
at /home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:76758
at Immediate. (/home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:77117)
at processImmediate (internal/timers.js:456:21)
[2021-04-13 11:06:43.289] [exthost] [error] [redhat.java] provider FAILED
[2021-04-13 11:06:43.290] [exthost] [error] Error: The request (id: 190849, method: 'textDocument/hover') has been cancelled
at /home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:76464
at /home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:76758
at Immediate. (/home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:77117)
at processImmediate (internal/timers.js:456:21)
[2021-04-13 11:08:33.211] [exthost] [warning] TextEditor is closed/disposed
[2021-04-13 11:08:39.710] [exthost] [info] ExtensionService#_doActivateExtension vscode.npm {"startup":false,"extensionId":{"value":"vscode.npm","_lower":"vscode.npm"},"activationEvent":"onLanguage:json"}
[2021-04-13 11:08:39.711] [exthost] [info] ExtensionService#loadCommonJSModule file:///usr/share/code/resources/app/extensions/npm/dist/npmMain

まず、リンクされている tackle-pathfinder プロジェクトで報告を再現し、org.lsp4mp.jdt.core.utils.JDTMicroProfileUtils.getProjectURI のスタックトレース、特に 62 行目を調査します。報告された null ポインターと、断続的に発生する未解決型の診断の周辺で、MicroProfilePropertiesListenerManager の delta 処理を追跡します。listener が失敗しなくなり、有効なクラスが断続的に未解決として報告されなくなれば完了です。