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https://issues.apache.org/jira/browse/NETBEANS-4095?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17094511#comment-17094511
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Eirik Bakke edited comment on NETBEANS-4095 at 4/28/20, 1:41 PM:
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I managed to reproduce it again on a fresh build of NetBeans 11.3 on Java 14,
with nbjavac installed and CoS enabled. It did not seem to occur without
nbjavac installed.
At some point it wasn't triggering the error, so I added
ystem.out.println("hello, world"); in the body of the for loop (to force a
recompilation--not sure what kinds of changes will do so). That triggered the
error again.
That was with source level 14, too.
was (Author: ebakke):
I managed to reproduce it again on a fresh build of NetBeans 11.3 on Java 14,
with nbjavac installed and CoS enabled. It did not seem to occur without
nbjavac installed.
At some point it wasn't triggering the error, so I added
ystem.out.println("hello, world"); in the body of the for loop (to force a
recompilation--not sure what kinds of changes will do so). That triggered the
error again.
> NPE saving Java file with type error in for-each
> ------------------------------------------------
>
> Key: NETBEANS-4095
> URL: https://issues.apache.org/jira/browse/NETBEANS-4095
> Project: NetBeans
> Issue Type: Bug
> Components: java - Source
> Affects Versions: 11.3
> Environment: Java 14, NetBeans with nbjavac plugin installed
> Reporter: Eirik Bakke
> Assignee: Arunava Sinha
> Priority: Major
> Labels: nbjavac
>
> If, during editing, a for-each loop appears with an incorrect pair of types,
> an error dialog shows up showing a NullPointerException every time the Java
> source file is saved, interrupting the user. A minimized example exhibiting
> this behavior is as follows:
> {code:java}
> public final class CausesVisitIterableForeachLoopNPE {
> public static final void main(String args[]) {
> final Map<String,Object> someMap = null;
> for (Object someVar : someMap) { }
> }
> }
> {code}
> This example causes the IDE to throw the following exception:
> {noformat}
> java.lang.NullPointerException
> at
> com.sun.tools.javac.comp.Lower.visitIterableForeachLoop(Lower.java:3275)
> at com.sun.tools.javac.comp.Lower.visitForeachLoop(Lower.java:3162)
> at
> com.sun.tools.javac.tree.JCTree$JCEnhancedForLoop.accept(JCTree.java:1176)
> at
> com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)
> at com.sun.tools.javac.comp.Lower.translate(Lower.java:2080)
> at
> com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:70)
> at
> com.sun.tools.javac.tree.TreeTranslator.visitBlock(TreeTranslator.java:167)
> at com.sun.tools.javac.comp.Lower.visitBlock(Lower.java:3347)
> at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:1036)
> at
> com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)
> at com.sun.tools.javac.comp.Lower.translate(Lower.java:2080)
> at
> com.sun.tools.javac.tree.TreeTranslator.visitMethodDef(TreeTranslator.java:150)
> at
> com.sun.tools.javac.comp.Lower.visitMethodDefInternal(Lower.java:2538)
> at com.sun.tools.javac.comp.Lower.visitMethodDef(Lower.java:2448)
> at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:882)
> at
> com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)
> at com.sun.tools.javac.comp.Lower.translate(Lower.java:2080)
> at com.sun.tools.javac.comp.Lower.visitClassDef(Lower.java:2219)
> at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:788)
> at
> com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)
> at com.sun.tools.javac.comp.Lower.translate(Lower.java:2080)
> at com.sun.tools.javac.comp.Lower.translate(Lower.java:2099)
> at
> com.sun.tools.javac.comp.Lower.translateTopLevelClass(Lower.java:3813)
> at com.sun.tools.javac.main.JavaCompiler.desugar(JavaCompiler.java:1691)
> at com.sun.tools.javac.main.JavaCompiler.desugar(JavaCompiler.java:1532)
> at
> com.sun.tools.javac.api.JavacTaskImpl$2.process(JavacTaskImpl.java:574)
> at
> com.sun.tools.javac.api.JavacTaskImpl$Filter.run(JavacTaskImpl.java:651)
> at
> com.sun.tools.javac.api.JavacTaskImpl.generate(JavacTaskImpl.java:577)
> [catch] at
> org.netbeans.modules.java.source.nbjavac.indexing.MultiPassCompileWorker.compile(MultiPassCompileWorker.java:303)
> at
> org.netbeans.modules.java.source.indexing.JavaCustomIndexer.index(JavaCustomIndexer.java:361)
> at
> org.netbeans.modules.parsing.spi.indexing.Indexable$MyAccessor$2.run(Indexable.java:138)
> at
> org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater.runIndexer(RepositoryUpdater.java:275)
> at
> org.netbeans.modules.parsing.spi.indexing.Indexable$MyAccessor.index(Indexable.java:136)
> at
> org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.doIndex(RepositoryUpdater.java:2750)
> at
> org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.access$800(RepositoryUpdater.java:2154)
> at
> org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work$1.run(RepositoryUpdater.java:2636)
> at
> org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work$1.run(RepositoryUpdater.java:2634)
> at
> org.netbeans.modules.parsing.impl.indexing.errors.TaskCache.refreshTransaction(TaskCache.java:540)
> at
> org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.index(RepositoryUpdater.java:2634)
> at
> org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work$3.call(RepositoryUpdater.java:3300)
> at
> org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work$3.call(RepositoryUpdater.java:3255)
> at
> org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$4.run(RepositoryUpdater.java:2127)
> at org.openide.util.lookup.Lookups.executeWith(Lookups.java:279)
> at
> org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater.runInContext(RepositoryUpdater.java:2123)
> at
> org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater.runInContext(RepositoryUpdater.java:2104)
> at
> org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater.access$1500(RepositoryUpdater.java:136)
> at
> org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.scanFiles(RepositoryUpdater.java:3255)
> at
> org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$FileListWork.getDone(RepositoryUpdater.java:3785)
> at
> org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.doTheWork(RepositoryUpdater.java:3420)
> at
> org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task._run(RepositoryUpdater.java:6183)
> at
> org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task.access$4300(RepositoryUpdater.java:5834)
> at
> org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task$2$1.run(RepositoryUpdater.java:6099)
> at org.openide.util.lookup.Lookups.executeWith(Lookups.java:279)
> at
> org.netbeans.modules.parsing.impl.RunWhenScanFinishedSupport.performScan(RunWhenScanFinishedSupport.java:83)
> at
> org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task$2.call(RepositoryUpdater.java:6095)
> at
> org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task$2.call(RepositoryUpdater.java:6091)
> at
> org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:153)
> at
> org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:335)
> at
> org.netbeans.modules.parsing.nb.DataObjectEnvFactory.runPriorityIO(DataObjectEnvFactory.java:118)
> at
> org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:67)
> at
> org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task.run(RepositoryUpdater.java:6091)
> at
> java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
> at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
> at
> org.openide.util.RequestProcessor$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)
> {noformat}
> The problem occurs whether Compile-or-Save is enabled or not. Tested in a
> Maven Java project on Java 14.
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