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NPE analysing new style switch statement (2.14.0) #3225

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rob-donovan opened this issue May 26, 2022 · 2 comments
Closed

NPE analysing new style switch statement (2.14.0) #3225

rob-donovan opened this issue May 26, 2022 · 2 comments

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@rob-donovan
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rob-donovan commented May 26, 2022 •
edited by cushon

Hello,

Since upgrading to version 2.14.0, seeing the following NPE being thrown. It appears this is occurring whilst analysing a method with a new style switch statement where the result is a Supplier of an Optional. For example:

Supplier<Optional<Record>> = switch(enumValue) {
    case VALUE1 -> () -> ....
    case VALUE2 -> () -> .....
};

Changing this to an old-style switch statement prevents the NPE.

14:49:32          error-prone version: 2.14.0
14:49:32          BugPattern: Immutable
14:49:32          Stack Trace:
14:49:32          java.lang.NullPointerException: Cannot invoke "com.google.errorprone.util.ASTHelpers$TargetType.type()" because the return value of "com.google.errorprone.util.ASTHelpers.targetType(com.google.errorprone.VisitorState)" is null
14:49:32         at com.google.errorprone.bugpatterns.threadsafety.ImmutableChecker.matchMemberReference(ImmutableChecker.java:150)
14:49:32         at com.google.errorprone.scanner.ErrorProneScanner.processMatchers(ErrorProneScanner.java:449)
14:49:32         at com.google.errorprone.scanner.ErrorProneScanner.visitMemberReference(ErrorProneScanner.java:715)
14:49:32         at com.google.errorprone.scanner.ErrorProneScanner.visitMemberReference(ErrorProneScanner.java:150)
14:49:32         at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCMemberReference.accept(JCTree.java:2546)
14:49:32         at jdk.compiler/com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:86)
14:49:32         at com.google.errorprone.scanner.Scanner.scan(Scanner.java:74)
14:49:32         at com.google.errorprone.scanner.Scanner.scan(Scanner.java:48)
14:49:32         at jdk.compiler/com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:96)
14:49:32         at jdk.compiler/com.sun.source.util.TreeScanner.visitCase(TreeScanner.java:401)
14:49:32         at com.google.errorprone.scanner.ErrorProneScanner.visitCase(ErrorProneScanner.java:534)
14:49:32         at com.google.errorprone.scanner.ErrorProneScanner.visitCase(ErrorProneScanner.java:150)
14:49:32         at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCCase.accept(JCTree.java:1357)
14:49:32         at jdk.compiler/com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:86)
14:49:32         at com.google.errorprone.scanner.Scanner.scan(Scanner.java:74)
14:49:32         at com.google.errorprone.scanner.Scanner.scan(Scanner.java:48)
14:49:32         at jdk.compiler/com.sun.source.util.TreeScanner.scan(TreeScanner.java:111)
14:49:32         at jdk.compiler/com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:119)
14:49:32         at jdk.compiler/com.sun.source.util.TreeScanner.visitSwitchExpression(TreeScanner.java:384)
14:49:32         at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCSwitchExpression.accept(JCTree.java:1390)
14:49:32         at jdk.compiler/com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:86)
14:49:32         at com.google.errorprone.scanner.Scanner.scan(Scanner.java:74)
14:49:32         at com.google.errorprone.scanner.Scanner.scan(Scanner.java:48)
14:49:32         at jdk.compiler/com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:96)
14:49:32         at jdk.compiler/com.sun.source.util.TreeScanner.visitVariable(TreeScanner.java:243)
14:49:32         at com.google.errorprone.scanner.ErrorProneScanner.visitVariable(ErrorProneScanner.java:885)
14:49:32         at com.google.errorprone.scanner.ErrorProneScanner.visitVariable(ErrorProneScanner.java:150)
14:49:32         at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCVariableDecl.accept(JCTree.java:1045)
14:49:32         at jdk.compiler/com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:86)
14:49:32         at com.google.errorprone.scanner.Scanner.scan(Scanner.java:74)
14:49:32         at com.google.errorprone.scanner.Scanner.scan(Scanner.java:48)
14:49:32         at jdk.compiler/com.sun.source.util.TreeScanner.scan(TreeScanner.java:111)
14:49:32         at jdk.compiler/com.sun.source.util.TreeScanner.visitBlock(TreeScanner.java:272)
14:49:32         at com.google.errorprone.scanner.ErrorProneScanner.visitBlock(ErrorProneScanner.java:520)
14:49:32         at com.google.errorprone.scanner.ErrorProneScanner.visitBlock(ErrorProneScanner.java:150)
14:49:32         at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:1103)
14:49:32         at jdk.compiler/com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:86)
14:49:32         at com.google.errorprone.scanner.Scanner.scan(Scanner.java:74)
14:49:32         at com.google.errorprone.scanner.Scanner.scan(Scanner.java:48)
14:49:32         at jdk.compiler/com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:96)
14:49:32         at jdk.compiler/com.sun.source.util.TreeScanner.visitMethod(TreeScanner.java:224)
14:49:32         at com.google.errorprone.scanner.ErrorProneScanner.visitMethod(ErrorProneScanner.java:740)
14:49:32         at com.google.errorprone.scanner.ErrorProneScanner.visitMethod(ErrorProneScanner.java:150)
14:49:32         at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:953)
14:49:32         at jdk.compiler/com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:86)
14:49:32         at com.google.errorprone.scanner.Scanner.scan(Scanner.java:74)
14:49:32         at com.google.errorprone.scanner.Scanner.scan(Scanner.java:48)
14:49:32         at jdk.compiler/com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:96)
14:49:32         at jdk.compiler/com.sun.source.util.TreeScanner.scan(TreeScanner.java:111)
14:49:32         at jdk.compiler/com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:119)
14:49:32         at jdk.compiler/com.sun.source.util.TreeScanner.visitClass(TreeScanner.java:203)
14:49:32         at com.google.errorprone.scanner.ErrorProneScanner.visitClass(ErrorProneScanner.java:548)
14:49:32         at com.google.errorprone.scanner.ErrorProneScanner.visitClass(ErrorProneScanner.java:150)
14:49:32         at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:860)
14:49:32         at jdk.compiler/com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:86)
14:49:32         at com.google.errorprone.scanner.Scanner.scan(Scanner.java:74)
14:49:32         at com.google.errorprone.scanner.Scanner.scan(Scanner.java:48)
14:49:32         at jdk.compiler/com.sun.source.util.TreeScanner.scan(TreeScanner.java:111)
14:49:32         at jdk.compiler/com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:119)
14:49:32         at jdk.compiler/com.sun.source.util.TreeScanner.visitCompilationUnit(TreeScanner.java:152)
14:49:32         at com.google.errorprone.scanner.ErrorProneScanner.visitCompilationUnit(ErrorProneScanner.java:560)
14:49:32         at com.google.errorprone.scanner.ErrorProneScanner.visitCompilationUnit(ErrorProneScanner.java:150)
14:49:32         at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCCompilationUnit.accept(JCTree.java:614)
14:49:32         at jdk.compiler/com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:60)
14:49:32         at com.google.errorprone.scanner.Scanner.scan(Scanner.java:58)
14:49:32         at com.google.errorprone.scanner.ErrorProneScannerTransformer.apply(ErrorProneScannerTransformer.java:43)
14:49:32         at com.google.errorprone.ErrorProneAnalyzer.finished(ErrorProneAnalyzer.java:152)
14:49:32         at jdk.compiler/com.sun.tools.javac.api.MultiTaskListener.finished(MultiTaskListener.java:132)
14:49:33         at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.flow(JavaCompiler.java:1394)
14:49:33         at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.flow(JavaCompiler.java:1341)
14:49:33         at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:933)
14:49:33         at jdk.compiler/com.sun.tools.javac.main.Main.compile(Main.java:317)
14:49:33         at jdk.compiler/com.sun.tools.javac.main.Main.compile(Main.java:176)
14:49:33         at jdk.compiler/com.sun.tools.javac.Main.compile(Main.java:64)
14:49:33         at jdk.compiler/com.sun.tools.javac.Main.main(Main.java:50)
@tbroyer
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tbroyer commented May 26, 2022

Looks like a duplicate of #3220

carterkozak added a commit to palantir/gradle-baseline that referenced this issue Jun 15, 2022
@carterkozak
The mockito error-prone library is no longer included by default
3cb1a32 
It has produced a substantially highter maintenance burden than
we're willing to accept, impacting the error_prone version used
in consumers before we're ready to adopt releases. For example,
google/error-prone#3225 results in
build failures when 2.14.0 is adopted.
@carterkozak carterkozak mentioned this issue Jun 15, 2022
Merged
This was referenced Jun 15, 2022
Closed
Closed
@cushon
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cushon commented Jul 16, 2022

#3220

@cushon cushon closed this as completed Jul 16, 2022
copybara-service bot pushed a commit that referenced this issue Aug 8, 2022
@schlosna
ImmutableChecker handles null types
7504736 
`ASTHelpers#getType(ClassTree)` and `ASTHelpers#targetType(VisitorState)` both may return null, which ImmutableChecker did not previously handle safely, which could lead to `NullPointerException` in cases such as switch expressions. This PR handles these potential `null` results more safely.

Fixes #3220 & #3225

Fixes #3267

COPYBARA_INTEGRATE_REVIEW=#3267 from schlosna:ds/3220 dd8f38f
PiperOrigin-RevId: 466185256
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@tbroyer @cushon @rob-donovan