AssertionError when annotation is placed on Type element

Abierto

#9,537 abierto el 2/8/2026 3 comentarios 0 reacciones 1 asignado Ver en GitHub

Los mantenedores suelen responder en 1 día

@lahodaj ya está trabajando en esto.

Desde el 2/8/2026.

Evaluación

Este issue todavía no se ha evaluado.

Descripción

Java kind:bug nb-javac

Apache NetBeans version

Apache NetBeans 32 latest daily build

What happened

I invoked code completion on a variable that was declared as var and where the actual type of the variable was a CompletableFuture. On the generic type information a @NonNull annotation was used.

The result of that invocation is an AssertionError from inside javac:

java.lang.AssertionError
	at com.sun.tools.javac.util.Assert.error(Assert.java:155)
	at com.sun.tools.javac.util.Assert.checkNonNull(Assert.java:62)
	at com.sun.tools.javac.comp.Annotate.fromAnnotations(Annotate.java:163)
	at com.sun.tools.javac.comp.Annotate.lambda$annotateTypeSecondStage$0(Annotate.java:1057)
	at com.sun.tools.javac.comp.Annotate.flush(Annotate.java:194)
	at com.sun.tools.javac.code.ClassFinder.complete(ClassFinder.java:322)
	at org.netbeans.lib.nbjavac.services.NBClassFinder.lambda$getCompleter$0(NBClassFinder.java:100)
	at com.sun.tools.javac.code.Symbol.complete(Symbol.java:703)
	at com.sun.tools.javac.code.Symbol$ClassSymbol.complete(Symbol.java:1472)
	at com.sun.tools.javac.code.Symbol.apiComplete(Symbol.java:709)
	at com.sun.tools.javac.code.Symbol$ClassSymbol.getInterfaces(Symbol.java:1484)
	at com.sun.tools.javac.code.Types$16.visitClassType(Types.java:2642)
	at com.sun.tools.javac.code.Types$16.visitClassType(Types.java:2633)
	at com.sun.tools.javac.code.Type$ClassType.accept(Type.java:1056)
	at com.sun.tools.javac.code.Types$UnaryVisitor.visit(Types.java:5058)
	at com.sun.tools.javac.code.Types.interfaces(Types.java:2630)
	at com.sun.tools.javac.code.Types$MembersClosureCache.visitClassType(Types.java:3115)
	at com.sun.tools.javac.code.Types$MembersClosureCache.visitClassType(Types.java:3055)
	at com.sun.tools.javac.code.Type$ClassType.accept(Type.java:1056)
	at com.sun.tools.javac.code.Types$DefaultTypeVisitor.visit(Types.java:4978)
	at com.sun.tools.javac.code.Types$MembersClosureCache.visitClassType(Types.java:3116)
	at com.sun.tools.javac.code.Types$MembersClosureCache.visitClassType(Types.java:3055)
	at com.sun.tools.javac.code.Type$ClassType.accept(Type.java:1056)
	at com.sun.tools.javac.code.Types$DefaultTypeVisitor.visit(Types.java:4978)
	at com.sun.tools.javac.code.Types.membersClosure(Types.java:3138)
	at com.sun.tools.javac.code.Types$ImplementationCache.get(Types.java:3012)
	at com.sun.tools.javac.code.Types.implementation(Types.java:3050)
	at com.sun.tools.javac.code.Symbol$MethodSymbol.implementation(Symbol.java:2239)
	at com.sun.tools.javac.code.Symbol$MethodSymbol.implementation(Symbol.java:2232)
	at com.sun.tools.javac.comp.Resolve.notOverriddenIn(Resolve.java:483)
	at com.sun.tools.javac.comp.Resolve.selectBest(Resolve.java:1598)
	at com.sun.tools.javac.comp.Resolve.findMethodInScope(Resolve.java:1814)
	at com.sun.tools.javac.comp.Resolve.findMethod(Resolve.java:1889)
	at com.sun.tools.javac.comp.Resolve.findMethod(Resolve.java:1858)
	at com.sun.tools.javac.comp.Resolve$12.lookup(Resolve.java:2831)
	at com.sun.tools.javac.comp.Resolve.lookupMethod(Resolve.java:3793)
	at com.sun.tools.javac.comp.Resolve.resolveQualifiedMethod(Resolve.java:2828)
	at com.sun.tools.javac.comp.Resolve.resolveQualifiedMethod(Resolve.java:2818)
	at com.sun.tools.javac.comp.Attr.selectSym(Attr.java:4561)
	at com.sun.tools.javac.comp.Attr.visitSelect(Attr.java:4449)
	at com.sun.tools.javac.tree.JCTree$JCFieldAccess.accept(JCTree.java:2601)
	at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:679)
	at com.sun.tools.javac.comp.Attr.visitApply(Attr.java:2665)
	at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1885)
	at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:679)
	at com.sun.tools.javac.comp.Attr.visitReturn(Attr.java:2525)
	at com.sun.tools.javac.tree.JCTree$JCReturn.accept(JCTree.java:1797)
	at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:679)
	at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:757)
	at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:776)
	at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1466)
	at org.netbeans.lib.nbjavac.services.NBAttr.visitBlock(NBAttr.java:94)
	at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:1161)
	at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:679)
	at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:757)
	at com.sun.tools.javac.comp.Attr.visitIf(Attr.java:2297)
	at com.sun.tools.javac.tree.JCTree$JCIf.accept(JCTree.java:1641)
	at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:679)
	at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:757)
	at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:776)
	at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1466)
	at org.netbeans.lib.nbjavac.services.NBAttr.visitBlock(NBAttr.java:94)
	at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:1161)
	at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:679)
	at com.sun.tools.javac.comp.DeferredAttr.attribSpeculative(DeferredAttr.java:530)
	at com.sun.tools.javac.comp.Attr.attribToTree(Attr.java:430)
	at com.sun.tools.javac.comp.Attr.attribStatToTree(Attr.java:423)
	at org.netbeans.lib.nbjavac.services.NBAttr.attribStatToTree(NBAttr.java:148)
	at com.sun.tools.javac.api.JavacTrees.attribStatToTree(JavacTrees.java:910)
	at com.sun.tools.javac.api.JavacTrees.getAttrContext(JavacTrees.java:885)
	at com.sun.tools.javac.api.JavacTrees.getScope(JavacTrees.java:751)
	at org.netbeans.lib.nbjavac.services.NBJavacTrees.getScope(NBJavacTrees.java:110)
	at org.netbeans.lib.nbjavac.services.NBJavacTrees.getScope(NBJavacTrees.java:48)
	at org.netbeans.modules.java.completion.BaseTask.getEnvImpl(BaseTask.java:359)
	at org.netbeans.modules.java.completion.BaseTask.getCompletionEnvironment(BaseTask.java:279)
	at org.netbeans.modules.java.completion.JavaCompletionTask.resolve(JavaCompletionTask.java:302)
	at org.netbeans.modules.java.completion.BaseTask.run(BaseTask.java:96)
	at org.netbeans.modules.java.completion.JavaCompletionTask.run(JavaCompletionTask.java:67)
	at org.netbeans.modules.parsing.impl.TaskProcessor.callUserTask(TaskProcessor.java:586)
	at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:197)
	at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:180)
	at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:181)
	at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:178)
	at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:153)
	at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:341)
	at org.netbeans.modules.parsing.nb.DataObjectEnvFactory.runPriorityIO(DataObjectEnvFactory.java:118)
	at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:67)
	at org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:178)
	at org.netbeans.modules.parsing.api.ParserManager.parse(ParserManager.java:83)
	at org.netbeans.modules.editor.java.JavaCompletionProvider$JavaCompletionQuery.query(JavaCompletionProvider.java:193)
	at org.netbeans.spi.editor.completion.support.AsyncCompletionTask.run(AsyncCompletionTask.java:198)
	at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1370)
	at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:45)
	at org.openide.util.lookup.Lookups.executeWith(Lookups.java:287)
[catch] at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1981)

Language / Project Type / NetBeans Component

Java Maven Application

How to reproduce

The original problem was observed in the OpenHAB Add-Ons repository:

https://github.com/openhab/openhab-addons/blob/fdb6211eee5a129cab19ed85a8a2a7398798fce8/bundles/org.openhab.binding.bluetooth.bluez/src/main/java/org/openhab/binding/bluetooth/bluez/internal/DeviceManagerFactory.java#L61-L68

After the if-Block insert a new line, enter future., the exception triggers immediately.

I tried to create a minimal reproducer and a maven project with org.eclipse.jdt.annotation configured and this code shows a slightly different stack trace, but judging from the end of the trace it looks like the same problem. Full project: hint_type_annotation.zip:

package eu.doppelhelix.test.hint_type_annotation;

import java.util.ArrayList;
import org.eclipse.jdt.annotation.NonNull;

public class HintTypeAnnotation {

    public void main(String[] args) {
        var future = new ArrayList<@NonNull String>();
    }
}

create a new line in main and enter future. and you'll get this trace:

java.lang.AssertionError
	at com.sun.tools.javac.util.Assert.error(Assert.java:155)
	at com.sun.tools.javac.util.Assert.checkNonNull(Assert.java:62)
	at com.sun.tools.javac.comp.Annotate.fromAnnotations(Annotate.java:163)
	at com.sun.tools.javac.comp.Annotate.lambda$annotateTypeSecondStage$0(Annotate.java:1057)
	at com.sun.tools.javac.comp.Annotate.flush(Annotate.java:194)
	at com.sun.tools.javac.code.ClassFinder.complete(ClassFinder.java:322)
	at org.netbeans.lib.nbjavac.services.NBClassFinder.lambda$getCompleter$0(NBClassFinder.java:100)
	at com.sun.tools.javac.code.Symbol.complete(Symbol.java:703)
	at com.sun.tools.javac.code.Symbol$ClassSymbol.complete(Symbol.java:1472)
	at com.sun.tools.javac.code.Symbol.apiComplete(Symbol.java:709)
	at com.sun.tools.javac.jvm.ClassReader$1.getEnclosingType(ClassReader.java:616)
	at com.sun.tools.javac.code.Type$StructuralTypeMapping.visitClassType(Type.java:243)
	at com.sun.tools.javac.code.Types$Subst.visitClassType(Types.java:3404)
	at com.sun.tools.javac.code.Types$Subst.visitClassType(Types.java:3370)
	at com.sun.tools.javac.code.Type$ClassType.accept(Type.java:1056)
	at com.sun.tools.javac.code.Types$DefaultTypeVisitor.visit(Types.java:4978)
	at com.sun.tools.javac.code.Types$TypeMapping.lambda$visit$0(Types.java:5086)
	at com.sun.tools.javac.util.List.map(List.java:428)
	at com.sun.tools.javac.code.Types$TypeMapping.visit(Types.java:5086)
	at com.sun.tools.javac.code.Type$StructuralTypeMapping.visitMethodType(Type.java:290)
	at com.sun.tools.javac.code.Type$StructuralTypeMapping.visitMethodType(Type.java:239)
	at com.sun.tools.javac.code.Type$MethodType.accept(Type.java:1502)
	at com.sun.tools.javac.code.Types$DefaultTypeVisitor.visit(Types.java:4978)
	at com.sun.tools.javac.code.Type.map(Type.java:319)
	at com.sun.tools.javac.code.Types.subst(Types.java:3363)
	at com.sun.tools.javac.code.Types$13.visitClassType(Types.java:2357)
	at com.sun.tools.javac.code.Types$13.visitClassType(Types.java:2328)
	at com.sun.tools.javac.code.Type$ClassType.accept(Type.java:1056)
	at com.sun.tools.javac.code.Types$DefaultTypeVisitor.visit(Types.java:4978)
	at com.sun.tools.javac.code.Types.memberType(Types.java:2325)
	at com.sun.tools.javac.code.Symbol$MethodSymbol.overrides(Symbol.java:2158)
	at com.sun.tools.javac.code.Symbol$MethodSymbol.overrides(Symbol.java:2132)
	at com.sun.tools.javac.model.JavacElements.overrides(JavacElements.java:698)
	at com.sun.tools.javac.model.JavacElements.addMembers(JavacElements.java:571)
	at com.sun.tools.javac.model.JavacElements.getAllMembers(JavacElements.java:561)
	at com.sun.tools.javac.model.JavacElements.getAllMembers(JavacElements.java:90)
	at org.netbeans.api.java.source.ElementUtilities.getMembers(ElementUtilities.java:241)
	at org.netbeans.modules.java.completion.JavaCompletionTask.addMembers(JavaCompletionTask.java:4223)
	at org.netbeans.modules.java.completion.JavaCompletionTask.insideMemberSelect(JavaCompletionTask.java:1936)
	at org.netbeans.modules.java.completion.JavaCompletionTask.resolve(JavaCompletionTask.java:380)
	at org.netbeans.modules.java.completion.BaseTask.run(BaseTask.java:96)
	at org.netbeans.modules.java.completion.JavaCompletionTask.run(JavaCompletionTask.java:67)
	at org.netbeans.modules.parsing.impl.TaskProcessor.callUserTask(TaskProcessor.java:586)
	at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:197)
	at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:180)
	at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:181)
	at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:178)
	at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:153)
	at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:341)
	at org.netbeans.modules.parsing.nb.DataObjectEnvFactory.runPriorityIO(DataObjectEnvFactory.java:118)
	at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:67)
	at org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:178)
	at org.netbeans.modules.parsing.api.ParserManager.parse(ParserManager.java:83)
	at org.netbeans.modules.editor.java.JavaCompletionProvider$JavaCompletionQuery.query(JavaCompletionProvider.java:193)
	at org.netbeans.spi.editor.completion.support.AsyncCompletionTask.run(AsyncCompletionTask.java:198)
	at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1370)
	at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:45)
	at org.openide.util.lookup.Lookups.executeWith(Lookups.java:287)
[catch] at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1981)

Did this work correctly in an earlier version?

No / Don't know

Operating System

Linux

JDK

OpenJDK 25

Apache NetBeans packaging

Own source build

Anything else

No response

Are you willing to submit a pull request?

Lenguaje dominante: Java
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Más issues de Java

AssertionError when annotation is placed on Type element

¿Algo no está bien?

Evaluación

Descripción

Apache NetBeans version

What happened

Language / Project Type / NetBeans Component

How to reproduce

Did this work correctly in an earlier version?

Operating System

JDK

Apache NetBeans packaging

Anything else

Are you willing to submit a pull request?

Preparar el entorno

Primeros pasos

Más de apache/netbeans

¿Algo no está bien?

¿Algo no está bien?

¿Algo no está bien?

¿Algo no está bien?

¿Algo no está bien?

Issues similares

¿Algo no está bien?

¿Algo no está bien?

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