The plugin cannot find jflex generated java source code.

[wy193777]

The plugin cannot correctly resolve OpenGrok's generated Java source.

Environment

• Operating System: Ubuntu 18.04
• JDK version: OpenJDK 11 64 Bit
• Visual Studio Code version: 1.33.1
• Java extension version: 0.43.0

Steps To Reproduce

1. git clone git@github.com:oracle/opengrok.git
2. Use VS Code open the folder.

Example project: OpenGrok

Current Result

Lots of errors like this one

{
	"resource": "/home/shenghang/code/opengrok/opengrok-indexer/src/main/java/org/opengrok/indexer/analysis/ada/AdaAnalyzer.java",
	"owner": "_generated_diagnostic_collection_name_#1",
	"code": "16777218",
	"severity": 8,
	"message": "AdaXref cannot be resolved to a type",
	"source": "Java",
	"startLineNumber": 68,
	"startColumn": 34,
	"endLineNumber": 68,
	"endColumn": 41
}

Expected Result

The project can be correctly parsed.

Additional Informations

The code that cannot be resolved is on opengrok-indexer/target/generated-sources/jflex/org/opengrok/indexer/analysis folder.

[wy193777]

Java Language Server log have this error on my system:

!ENTRY org.eclipse.jdt.ls.core 4 0 2019-04-24 18:35:40.968
!MESSAGE Problem with folding range for /opengrok/src/main/java/org/opengrok/indexer/analysis/ada/AdaAnalyzer.java
!STACK 0
org.eclipse.jdt.core.compiler.InvalidInputException: Underscores_In_Literals_Not_Below_17
	at org.eclipse.jdt.internal.core.util.PublicScanner.consumeDigits(PublicScanner.java:766)
	at org.eclipse.jdt.internal.core.util.PublicScanner.consumeDigits(PublicScanner.java:754)
	at org.eclipse.jdt.internal.core.util.PublicScanner.scanNumber(PublicScanner.java:3702)
	at org.eclipse.jdt.internal.core.util.PublicScanner.getNextToken(PublicScanner.java:1763)
	at org.eclipse.jdt.ls.core.internal.handlers.FoldingRangeHandler.computeFoldingRanges(FoldingRangeHandler.java:110)
	at org.eclipse.jdt.ls.core.internal.handlers.FoldingRangeHandler.foldingRange(FoldingRangeHandler.java:61)
	at org.eclipse.jdt.ls.core.internal.handlers.JDTLanguageServer.lambda$25(JDTLanguageServer.java:758)
	at org.eclipse.jdt.ls.core.internal.handlers.JDTLanguageServer.lambda$34(JDTLanguageServer.java:841)
	at java.base/java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:642)
	at java.base/java.util.concurrent.CompletableFuture$Completion.exec(CompletableFuture.java:479)
	at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:290)
	at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1020)
	at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1656)
	at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1594)
	at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:177)

Seems it is related to JDK version. But my java -version output is:

openjdk version "11.0.2" 2019-01-15
OpenJDK Runtime Environment (build 11.0.2+9-Ubuntu-3ubuntu118.04.3)
OpenJDK 64-Bit Server VM (build 11.0.2+9-Ubuntu-3ubuntu118.04.3, mixed mode, sharing)