René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"experimental javac compiler: tree.kind is null","articleBody":"Hello,\n\nI'm trying the experimental javac compiler and getting the following error:\n\n```\n!ENTRY org.eclipse.jdt.core 4 0 2025-12-29 17:07:42.568\n!MESSAGE Error while analyzing\n!STACK 0\njava.lang.IllegalStateException: java.lang.NullPointerException: Cannot invoke \"com.sun.tools.javac.tree.JCTree$JCMemberReference$ReferenceKind.ordinal()\" because \"tree.kind\" is null\n\tat jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.analyze(JavacTaskImpl.java:383)\n\tat org.eclipse.jdt.core.dom.JavacCompilationUnitResolver.parse(JavacCompilationUnitResolver.java:1025)\n\tat org.eclipse.jdt.core.dom.JavacCompilationUnitResolver.toCompilationUnit(JavacCompilationUnitResolver.java:602)\n\tat org.eclipse.jdt.core.dom.ASTParser.internalCreateASTCached(ASTParser.java:1410)\n\tat org.eclipse.jdt.core.dom.ASTParser.lambda$1(ASTParser.java:1289)\n\tat org.eclipse.jdt.internal.core.JavaModelManager.cacheZipFiles(JavaModelManager.java:5709)\n\tat org.eclipse.jdt.core.dom.ASTParser.internalCreateAST(ASTParser.java:1289)\n\tat org.eclipse.jdt.core.dom.ASTParser.createAST(ASTParser.java:933)\n\tat org.eclipse.jdt.internal.core.CompilationUnit.buildStructure(CompilationUnit.java:175)\n\tat org.eclipse.jdt.internal.core.Openable.generateInfos(Openable.java:250)\n\tat org.eclipse.jdt.internal.core.JavaElement.openWhenClosed(JavaElement.java:571)\n\tat org.eclipse.jdt.internal.core.JavaElement.getElementInfo(JavaElement.java:294)\n\tat org.eclipse.jdt.internal.core.JavaElement.getElementInfo(JavaElement.java:280)\n\tat org.eclipse.jdt.internal.core.CompilationUnit.getCompilationUnitElementInfo(CompilationUnit.java:1605)\n\tat org.eclipse.jdt.internal.core.CompilationUnit.getCustomOptions(CompilationUnit.java:1583)\n\tat org.eclipse.jdt.core.ICompilationUnit.getOptions(ICompilationUnit.java:607)\n\tat org.eclipse.jdt.core.dom.ASTParser.setSource(ASTParser.java:677)\n\tat org.eclipse.jdt.internal.core.search.indexing.SourceIndexer.indexDocumentFromDOM(SourceIndexer.java:415)\n\tat org.eclipse.jdt.internal.core.search.indexing.SourceIndexer.indexDocument(SourceIndexer.java:104)\n\tat org.eclipse.jdt.internal.core.search.JavaSearchParticipant.indexDocument(JavaSearchParticipant.java:91)\n\tat org.eclipse.jdt.internal.core.search.indexing.IndexManager.indexDocument(IndexManager.java:664)\n\tat org.eclipse.jdt.internal.core.search.indexing.IndexManager$2.execute(IndexManager.java:1269)\n\tat org.eclipse.jdt.internal.core.search.processing.JobManager.indexerLoop(JobManager.java:541)\n\tat java.base/java.lang.Thread.run(Thread.java:1474)\nCaused by: java.lang.NullPointerException: Cannot invoke \"com.sun.tools.javac.tree.JCTree$JCMemberReference$ReferenceKind.ordinal()\" because \"tree.kind\" is null\n\tat jdk.compiler/com.sun.tools.javac.comp.ThisEscapeAnalyzer.visitReference(ThisEscapeAnalyzer.java:972)\n\tat jdk.compiler/com.sun.tools.javac.tree.JCTree$JCMemberReference.accept(JCTree.java:2657)\n\tat jdk.compiler/com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:50)\n\tat jdk.compiler/com.sun.tools.javac.comp.ThisEscapeAnalyzer.scan(ThisEscapeAnalyzer.java:460)\n\tat jdk.compiler/com.sun.tools.javac.comp.ThisEscapeAnalyzer.invokeUnknown(ThisEscapeAnalyzer.java:685)\n\tat jdk.compiler/com.sun.tools.javac.comp.ThisEscapeAnalyzer.invoke(ThisEscapeAnalyzer.java:594)\n\tat jdk.compiler/com.sun.tools.javac.comp.ThisEscapeAnalyzer.visitApply(ThisEscapeAnalyzer.java:535)\n\tat jdk.compiler/com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1860)\n\tat jdk.compiler/com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:50)\n\tat jdk.compiler/com.sun.tools.javac.comp.ThisEscapeAnalyzer.scan(ThisEscapeAnalyzer.java:460)\n\tat jdk.compiler/com.sun.tools.javac.comp.ThisEscapeAnalyzer.visitSelect(ThisEscapeAnalyzer.java:934)\n\tat jdk.compiler/com.sun.tools.javac.tree.JCTree$JCFieldAccess.accept(JCTree.java:2576)\n\tat jdk.compiler/com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:50)\n\tat jdk.compiler/com.sun.tools.javac.comp.ThisEscapeAnalyzer.scan(ThisEscapeAnalyzer.java:460)\n\tat jdk.compiler/com.sun.tools.javac.comp.ThisEscapeAnalyzer.visitApply(ThisEscapeAnalyzer.java:510)\n\tat jdk.compiler/com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1860)\n\tat jdk.compiler/com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:50)\n\tat jdk.compiler/com.sun.tools.javac.comp.ThisEscapeAnalyzer.scan(ThisEscapeAnalyzer.java:460)\n\tat jdk.compiler/com.sun.tools.javac.comp.ThisEscapeAnalyzer.visitAssign(ThisEscapeAnalyzer.java:912)\n\tat jdk.compiler/com.sun.tools.javac.tree.JCTree$JCAssign.accept(JCTree.java:2105)\n\tat jdk.compiler/com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:50)\n\tat jdk.compiler/com.sun.tools.javac.comp.ThisEscapeAnalyzer.scan(ThisEscapeAnalyzer.java:460)\n\tat jdk.compiler/com.sun.tools.javac.comp.ThisEscapeAnalyzer.visitExec(ThisEscapeAnalyzer.java:1080)\n\tat jdk.compiler/com.sun.tools.javac.tree.JCTree$JCExpressionStatement.accept(JCTree.java:1647)\n\tat jdk.compiler/com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:50)\n\tat jdk.compiler/com.sun.tools.javac.comp.ThisEscapeAnalyzer.scan(ThisEscapeAnalyzer.java:460)\n\tat jdk.compiler/com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:58)\n\tat jdk.compiler/com.sun.tools.javac.tree.TreeScanner.visitBlock(TreeScanner.java:150)\n\tat jdk.compiler/com.sun.tools.javac.comp.ThisEscapeAnalyzer.lambda$visitBlock$0(ThisEscapeAnalyzer.java:762)\n\tat jdk.compiler/com.sun.tools.javac.comp.ThisEscapeAnalyzer.visitScoped(ThisEscapeAnalyzer.java:1274)\n\tat jdk.compiler/com.sun.tools.javac.comp.ThisEscapeAnalyzer.visitBlock(ThisEscapeAnalyzer.java:762)\n\tat jdk.compiler/com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:1136)\n\tat jdk.compiler/com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:50)\n\tat jdk.compiler/com.sun.tools.javac.comp.ThisEscapeAnalyzer.scan(ThisEscapeAnalyzer.java:460)\n\tat jdk.compiler/com.sun.tools.javac.comp.ThisEscapeAnalyzer.visitIf(ThisEscapeAnalyzer.java:1074)\n\tat jdk.compiler/com.sun.tools.javac.tree.JCTree$JCIf.accept(JCTree.java:1616)\n\tat jdk.compiler/com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:50)\n\tat jdk.compiler/com.sun.tools.javac.comp.ThisEscapeAnalyzer.scan(ThisEscapeAnalyzer.java:460)\n\tat jdk.compiler/com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:58)\n\tat jdk.compiler/com.sun.tools.javac.tree.TreeScanner.visitBlock(TreeScanner.java:150)\n\tat jdk.compiler/com.sun.tools.javac.comp.ThisEscapeAnalyzer.lambda$visitBlock$0(ThisEscapeAnalyzer.java:762)\n\tat jdk.compiler/com.sun.tools.javac.comp.ThisEscapeAnalyzer.visitScoped(ThisEscapeAnalyzer.java:1274)\n\tat jdk.compiler/com.sun.tools.javac.comp.ThisEscapeAnalyzer.visitBlock(ThisEscapeAnalyzer.java:762)\n\tat jdk.compiler/com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:1136)\n\tat jdk.compiler/com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:50)\n\tat jdk.compiler/com.sun.tools.javac.comp.ThisEscapeAnalyzer.scan(ThisEscapeAnalyzer.java:460)\n\tat jdk.compiler/com.sun.tools.javac.comp.ThisEscapeAnalyzer.lambda$analyzeConstructor$0(ThisEscapeAnalyzer.java:1221)\n\tat jdk.compiler/com.sun.tools.javac.comp.ThisEscapeAnalyzer.visitScoped(ThisEscapeAnalyzer.java:1274)\n\tat jdk.compiler/com.sun.tools.javac.comp.ThisEscapeAnalyzer.analyzeConstructor(ThisEscapeAnalyzer.java:1221)\n\tat java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:186)\n\tat java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:197)\n\tat java.base/java.util.Iterator.forEachRemaining(Iterator.java:133)\n\tat java.base/java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1939)\n\tat java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:570)\n\tat java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:560)\n\tat java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:153)\n\tat java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:176)\n\tat java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:265)\n\tat java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:632)\n\tat jdk.compiler/com.sun.tools.javac.comp.ThisEscapeAnalyzer.doAnalyzeTree(ThisEscapeAnalyzer.java:376)\n\tat jdk.compiler/com.sun.tools.javac.comp.ThisEscapeAnalyzer.analyzeTree(ThisEscapeAnalyzer.java:244)\n\tat jdk.compiler/com.sun.tools.javac.comp.WarningAnalyzer.analyzeTree(WarningAnalyzer.java:61)\n\tat jdk.compiler/com.sun.tools.javac.main.JavaCompiler.warn(JavaCompiler.java:1469)\n\tat jdk.compiler/com.sun.tools.javac.main.JavaCompiler.warn(JavaCompiler.java:1436)\n\tat jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.analyze(JavacTaskImpl.java:404)\n\tat jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.lambda$analyze$0(JavacTaskImpl.java:379)\n\tat jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.invocationHelper(JavacTaskImpl.java:152)\n\tat jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.analyze(JavacTaskImpl.java:379)\n\t... 23 more\n```\n\nI'm not sure what I can share to be usefull\n\n```\n    \"java.jdt.ls.java.home\": \"~/.asdf/installs/java/openjdk-25/\",\n    \"java.jdt.ls.javac.enabled\": \"on\",\n```\n\n\u003cimg width=\"624\" height=\"236\" alt=\"Image\" src=\"https://github.com/user-attachments/assets/c36f78a2-24a1-4501-8468-9699a3bd1906\" /\u003e\n\nThere is no issue compiling with ecj\n\nI can't share the source code of the project but if you tell me where to look with more debugging I can help\n\nRegards\n","author":{"url":"https://github.com/ylecuyer","@type":"Person","name":"ylecuyer"},"datePublished":"2025-12-29T16:15:36.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/4295/vscode-java/issues/4295"}