Partial jdk classes cannot be resolved. It is indirectly reference from required ...

1. Open spring-petclinic project in VS Code and observe the compilation error below.

[{
	"resource": "/C:/Work/Code/spring-petclinic/src/test/java/org/springframework/samples/petclinic/PetClinicIntegrationTests.java",
	"owner": "_generated_diagnostic_collection_name_#4",
	"code": "16777563",
	"severity": 8,
	"message": "The type java.lang.Enum cannot be resolved. It is indirectly referenced from required type org.springframework.boot.test.context.SpringBootTest.WebEnvironment",
	"source": "Java",
	"startLineNumber": 1,
	"startColumn": 1,
	"endLineNumber": 1,
	"endColumn": 2
}]

2. In the Java Projects view, Enum.class is also not resolved in the JRE tree view.

3. Click Enum.class in the JRE tree view, Java extension reports error as below.

!ENTRY org.eclipse.jdt.ls.core 4 0 2023-10-26 16:12:15.657
!MESSAGE Enum.class [in java.lang [in <module:java.base>]] does not exist
!STACK 1
Java Model Exception: Error in Java Model (code 969): Enum.class [in java.lang [in <module:java.base>]] does not exist
	at org.eclipse.jdt.internal.core.JavaElement.newNotPresentException(JavaElement.java:550)
	at org.eclipse.jdt.internal.core.ClassFile.getBinaryTypeInfo(ClassFile.java:203)
	at org.eclipse.jdt.internal.core.ClassFile.buildStructure(ClassFile.java:92)
	at org.eclipse.jdt.internal.core.Openable.generateInfos(Openable.java:266)
	at org.eclipse.jdt.internal.core.JavaElement.openWhenClosed(JavaElement.java:573)
	at org.eclipse.jdt.internal.core.JavaElement.getElementInfo(JavaElement.java:304)
	at org.eclipse.jdt.internal.core.JavaElement.getElementInfo(JavaElement.java:290)
	at org.eclipse.jdt.internal.core.Openable.getBuffer(Openable.java:296)
	at org.eclipse.jdt.internal.core.AbstractClassFile.getBuffer(AbstractClassFile.java:245)
	at org.eclipse.jdt.internal.core.AbstractClassFile.getSourceRange(AbstractClassFile.java:371)
	at org.eclipse.jdt.ls.core.internal.JDTUtils.resolveTypeRoot(JDTUtils.java:452)
	at org.eclipse.jdt.ls.core.internal.handlers.FoldingRangeHandler.foldingRange(FoldingRangeHandler.java:66)
	at org.eclipse.jdt.ls.core.internal.handlers.JDTLanguageServer.lambda$30(JDTLanguageServer.java:1027)
	at org.eclipse.jdt.ls.core.internal.handlers.JDTLanguageServer.lambda$59(JDTLanguageServer.java:1216)
	at java.base/java.util.concurrent.CompletableFuture$UniApply.tryFire(Unknown Source)
	at java.base/java.util.concurrent.CompletableFuture$Completion.exec(Unknown Source)
	at java.base/java.util.concurrent.ForkJoinTask.doExec(Unknown Source)
	at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(Unknown Source)
	at java.base/java.util.concurrent.ForkJoinPool.scan(Unknown Source)
	at java.base/java.util.concurrent.ForkJoinPool.runWorker(Unknown Source)
	at java.base/java.util.concurrent.ForkJoinWorkerThread.run(Unknown Source)
!SUBENTRY 1 org.eclipse.jdt.core 4 969 2023-10-26 16:12:15.657
!MESSAGE Enum.class [in java.lang [in <module:java.base>]] does not exist

4. I cannot reproduce this issue consistently, but I encountered it twice in my local environment recently. Reloading the window usually fixes it. I am opening this issue to see if anyone else has the same problem.

Tái hiện sự cố trong dự án spring-petclinic và kiểm tra chẩn đoán của PetClinicIntegrationTests.java cùng với cây Java Projects JRE. Bắt đầu bằng báo cáo về việc thiếu Enum.class và stack trace của org.eclipse.jdt.ls.core, sau đó so sánh hành vi trước và sau khi tải lại cửa sổ VS Code. Hoàn tất khi các lớp JDK không đầy đủ không còn gây ra lỗi phân giải đã được báo cáo.