Jan Lahoda created NETBEANS-4447:
------------------------------------
Summary: NullPointerException while computing switch expression
conversion.
Key: NETBEANS-4447
URL: https://issues.apache.org/jira/browse/NETBEANS-4447
Project: NetBeans
Issue Type: Bug
Components: java - Hints
Reporter: Jan Lahoda
Assignee: Arunava Sinha
Consider this code:
{code:java}
package pkgswitch.expr;
public class SwitchExpr {
public static void main(String[] args) {
String result;
switch (args.length) {
case 0: result = "a"; break;
default: System.err.println("No."); break;
}
}
}
{code}
The ConvertSwitchToRuleSwitch hint fails with:
{code:java}
java.lang.NullPointerException
at
jdk.compiler/com.sun.tools.javac.util.Name.contentEquals(Name.java:54)
at
org.netbeans.modules.java.hints.errors.Utilities.isCompatibleWithSwitchExpression(Utilities.java:3155)
at
org.netbeans.modules.java.hints.jdk.ConvertSwitchToRuleSwitch.switch2RuleSwitch(ConvertSwitchToRuleSwitch.java:74)
at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
at
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
[catch] at
org.netbeans.modules.java.hints.providers.code.CodeHintProviderImpl$WorkerImpl.createErrors(CodeHintProviderImpl.java:317)
at
org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker.runHint(HintsInvoker.java:798)
at
org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker.access$400(HintsInvoker.java:90)
at
org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker$ScannerImpl.runAndAdd(HintsInvoker.java:657)
at
org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker$ScannerImpl.scan(HintsInvoker.java:676)
at
org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker$ScannerImpl.scan(HintsInvoker.java:610)
at
jdk.compiler/com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:90)
at
jdk.compiler/com.sun.source.util.TreeScanner.scan(TreeScanner.java:105)
at
org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:78)
at
jdk.compiler/com.sun.source.util.TreeScanner.visitBlock(TreeScanner.java:250)
at
jdk.compiler/com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:1059)
at
jdk.compiler/com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:82)
at
org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:69)
at
org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker$ScannerImpl.scan(HintsInvoker.java:682)
at
org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker$ScannerImpl.scan(HintsInvoker.java:610)
at
jdk.compiler/com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:90)
at
jdk.compiler/com.sun.source.util.TreeScanner.visitMethod(TreeScanner.java:208)
at
jdk.compiler/com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:925)
at
jdk.compiler/com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:82)
at
org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:69)
at
org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker$ScannerImpl.scan(HintsInvoker.java:682)
at
org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker$ScannerImpl.scan(HintsInvoker.java:610)
at
jdk.compiler/com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:90)
at
jdk.compiler/com.sun.source.util.TreeScanner.scan(TreeScanner.java:105)
at
org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:78)
at
jdk.compiler/com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:113)
at
jdk.compiler/com.sun.source.util.TreeScanner.visitClass(TreeScanner.java:189)
at
jdk.compiler/com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:832)
at
jdk.compiler/com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:82)
at
org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:69)
at
org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker$ScannerImpl.scan(HintsInvoker.java:682)
at
org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker$ScannerImpl.scan(HintsInvoker.java:610)
at
jdk.compiler/com.sun.source.util.TreeScanner.scan(TreeScanner.java:105)
at
org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:78)
at
jdk.compiler/com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:113)
at
jdk.compiler/com.sun.source.util.TreeScanner.visitCompilationUnit(TreeScanner.java:144)
at
jdk.compiler/com.sun.tools.javac.tree.JCTree$JCCompilationUnit.accept(JCTree.java:603)
at
jdk.compiler/com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:56)
at
org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker$ScannerImpl.scan(HintsInvoker.java:701)
at
org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker.computeHintsImpl(HintsInvoker.java:245)
at
org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker.computeHints(HintsInvoker.java:228)
at
org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker.computeHints(HintsInvoker.java:193)
at
org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker.computeHints(HintsInvoker.java:166)
at
org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker.computeHints(HintsInvoker.java:128)
at
org.netbeans.modules.java.hints.spiimpl.hints.HintsTask.run(HintsTask.java:114)
at
org.netbeans.modules.java.hints.spiimpl.hints.HintsTask.run(HintsTask.java:65)
at
org.netbeans.modules.java.source.JavaSourceAccessor$CancelableTaskWrapper.run(JavaSourceAccessor.java:273)
at
org.netbeans.modules.parsing.impl.TaskProcessor.callParserResultTask(TaskProcessor.java:561)
at
org.netbeans.modules.parsing.impl.TaskProcessor$RequestPerformer.run(TaskProcessor.java:786)
at org.openide.util.lookup.Lookups.executeWith(Lookups.java:279)
at
org.netbeans.modules.parsing.impl.TaskProcessor$RequestPerformer.execute(TaskProcessor.java:702)
at
org.netbeans.modules.parsing.impl.TaskProcessor$CompilationJob.run(TaskProcessor.java:663)
at
java.base/java.util.concurrent.Executors$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)
{code}
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