[NETBEANS-1224] Code completion for lambda parameter throwing exception in jdk-11

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 10.0
• Component/s: java - Editor
• Labels: pull-request-available
• Assignee: Unassigned
• Reporter: ARUNAVA SINHA
• Created: 06/Sep/18 09:38
• Updated: 03/Nov/19 20:07
• Resolved: 01/Oct/18 00:23

Description

If we have a functional interface as method argument and we want to implement it using lambda expression , then on trying to do code-completion for lambda param exception occurs.

The issue is reproducible in Open JDK-11 with or without nb-javac(for jdk-11)

The issue was reproduced using OpenJDK 64-Bit Server VM 18.9 (build 11+28, mixed mode) 

Please find below sample code for simulating the issue.

public class JavaApplication1 {
public static void main(String[] args)

{ JavaApplication1 obj = new JavaApplication1(); obj.test((var a,^ )); }

private void test(FuncInterface f) {}
interface FuncInterface{ public void test(String s, int p, long v); }

}

 

On doing ctl+space at  '^' throwing below exception.

=====================

java.lang.NullPointerException
at jdk.compiler/com.sun.tools.javac.code.Types.subst(Types.java:3258)
at jdk.compiler/com.sun.tools.javac.comp.InferenceContext.asUndetVar(InferenceContext.java:207)
at jdk.compiler/com.sun.tools.javac.comp.InferenceContext.asUndetVars(InferenceContext.java:213)
at jdk.compiler/com.sun.tools.javac.comp.Attr.checkLambdaCompatible(Attr.java:2872)
at jdk.compiler/com.sun.tools.javac.comp.Attr.visitLambda(Attr.java:2610)
at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCLambda.accept(JCTree.java:1807)
at jdk.compiler/com.sun.tools.javac.comp.Attr.attribTree(Attr.java:655)
at jdk.compiler/com.sun.tools.javac.comp.DeferredAttr.attribSpeculative(DeferredAttr.java:497)
at jdk.compiler/com.sun.tools.javac.comp.DeferredAttr.attribSpeculative(DeferredAttr.java:480)
at jdk.compiler/com.sun.tools.javac.comp.DeferredAttr$4.complete(DeferredAttr.java:368)
at jdk.compiler/com.sun.tools.javac.comp.DeferredAttr$DeferredType.check(DeferredAttr.java:334)
at jdk.compiler/com.sun.tools.javac.comp.DeferredAttr$DeferredType.check(DeferredAttr.java:320)
at jdk.compiler/com.sun.tools.javac.comp.DeferredAttr$RecoveryDeferredTypeMap.recover(DeferredAttr.java:1033)
at jdk.compiler/com.sun.tools.javac.comp.DeferredAttr$RecoveryDeferredTypeMap.typeOf(DeferredAttr.java:1022)
at jdk.compiler/com.sun.tools.javac.comp.Resolve$ResolveDeferredRecoveryMap.typeOf(Resolve.java:2554)
at jdk.compiler/com.sun.tools.javac.comp.DeferredAttr$DeferredTypeMap.visitType(DeferredAttr.java:989)
at jdk.compiler/com.sun.tools.javac.comp.DeferredAttr$RecoveryDeferredTypeMap.visitType(DeferredAttr.java:1012)
at jdk.compiler/com.sun.tools.javac.comp.DeferredAttr$DeferredTypeMap.visitType(DeferredAttr.java:975)
at jdk.compiler/com.sun.tools.javac.code.Type.accept(Type.java:214)
at jdk.compiler/com.sun.tools.javac.code.Types$MapVisitor.visit(Types.java:4940)
at jdk.compiler/com.sun.tools.javac.code.Types$TypeMapping.apply(Types.java:4951)
at jdk.compiler/com.sun.tools.javac.code.Types$TypeMapping.apply(Types.java:4949)
at jdk.compiler/com.sun.tools.javac.util.List.map(List.java:425)
at jdk.compiler/com.sun.tools.javac.comp.Resolve$8.getArgumentTypes(Resolve.java:2542)
at jdk.compiler/com.sun.tools.javac.comp.Resolve.accessInternal(Resolve.java:2463)
at jdk.compiler/com.sun.tools.javac.comp.Resolve.accessMethod(Resolve.java:2483)
at jdk.compiler/com.sun.tools.javac.comp.Resolve$BasicLookupHelper.access(Resolve.java:3297)
at jdk.compiler/com.sun.tools.javac.comp.Resolve$10.access(Resolve.java:2651)
at jdk.compiler/com.sun.tools.javac.comp.Resolve.lookupMethod(Resolve.java:3538)
at jdk.compiler/com.sun.tools.javac.comp.Resolve.resolveQualifiedMethod(Resolve.java:2641)
at jdk.compiler/com.sun.tools.javac.comp.Resolve.resolveQualifiedMethod(Resolve.java:2635)
at jdk.compiler/com.sun.tools.javac.comp.Attr.selectSym(Attr.java:3721)
at jdk.compiler/com.sun.tools.javac.comp.Attr.visitSelect(Attr.java:3601)
at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCFieldAccess.accept(JCTree.java:2110)
at jdk.compiler/com.sun.tools.javac.comp.Attr.attribTree(Attr.java:655)
at jdk.compiler/com.sun.tools.javac.comp.Attr.visitApply(Attr.java:2006)
at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1634)
at jdk.compiler/com.sun.tools.javac.comp.Attr.attribTree(Attr.java:655)
at jdk.compiler/com.sun.tools.javac.comp.Attr.attribExpr(Attr.java:702)
at jdk.compiler/com.sun.tools.javac.comp.Attr.visitExec(Attr.java:1773)
at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCExpressionStatement.accept(JCTree.java:1452)
at jdk.compiler/com.sun.tools.javac.comp.Attr.attribTree(Attr.java:655)
at jdk.compiler/com.sun.tools.javac.comp.Attr.attribStat(Attr.java:724)
at jdk.compiler/com.sun.tools.javac.comp.Attr.attribStats(Attr.java:743)
at jdk.compiler/com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1294)
at org.netbeans.lib.nbjavac.services.NBAttr.visitBlock(NBAttr.java:69)
at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:1020)
at jdk.compiler/com.sun.tools.javac.comp.Attr.attribTree(Attr.java:655)
at jdk.compiler/com.sun.tools.javac.comp.Attr.attribStat(Attr.java:724)
at jdk.compiler/com.sun.tools.javac.comp.Attr.attribStatToTree(Attr.java:420)
at jdk.compiler/com.sun.tools.javac.api.JavacTrees.attribStatToTree(JavacTrees.java:937)
at jdk.compiler/com.sun.tools.javac.api.JavacTrees.getAttrContext(JavacTrees.java:911)
at jdk.compiler/com.sun.tools.javac.api.JavacTrees.getScope(JavacTrees.java:785)
at jdk.compiler/com.sun.tools.javac.api.JavacTrees.getScope(JavacTrees.java:165)
at org.netbeans.modules.java.completion.BaseTask.getEnvImpl(BaseTask.java:319)
at org.netbeans.modules.java.completion.BaseTask.getCompletionEnvironment(BaseTask.java:269)
at org.netbeans.modules.java.completion.JavaCompletionTask.resolve(JavaCompletionTask.java:288)
at org.netbeans.modules.java.completion.BaseTask.run(BaseTask.java:93)
at org.netbeans.modules.java.completion.JavaCompletionTask.run(JavaCompletionTask.java:59)
at org.netbeans.modules.parsing.impl.TaskProcessor.callUserTask(TaskProcessor.java:586)
at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:130)
at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:114)
at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:181)
at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:178)
at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:153)
at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:335)
at org.netbeans.modules.parsing.nb.DataObjectEnvFactory.runPriorityIO(DataObjectEnvFactory.java:118)
at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:67)
at org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:178)
Caused: org.netbeans.modules.parsing.spi.ParseException
at org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:186)
at org.netbeans.modules.parsing.api.ParserManager.parse(ParserManager.java:81)
[catch] at org.netbeans.modules.editor.java.JavaCompletionProvider$JavaCompletionQuery.query(JavaCompletionProvider.java:193)
at org.netbeans.spi.editor.completion.support.AsyncCompletionTask.run(AsyncCompletionTask.java:198)
at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1418)
at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:45)
at org.openide.util.lookup.Lookups.executeWith(Lookups.java:278)
at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)

Issue Links

• links to: GitHub Pull Request #921