On OpenJDK 27, VarWithPrimitive crashes when presented with a lambda that implements a method with a primitive typed parameter if that parameter is left untyped:
class Repro {
void crash() {
java.util.function.IntConsumer c = (i) -> {};
}
void no_crash() {
java.util.function.IntConsumer c = (int i) -> {};
}
}The crash does not manifest on OpenJDK 21-26 or for reference type-only parameter lists and is not affected by parameter list parentheses, the lambda body, or whether RHS is explicitly cast to the expected type. var does not need to appear anywhere in the file.
(Also, VarWithPrimitive is not listed in https://github.com/google/error-prone/releases/tag/v2.50.0.)
$JAVA_HOME/bin/java --version
openjdk 27 2026-09-15
OpenJDK Runtime Environment Temurin-27+35 (build 27+35)
OpenJDK 64-Bit Server VM Temurin-27+35 (build 27+35, mixed mode, sharing)
[ERROR] error-prone version: 2.50.0
[ERROR] BugPattern: VarWithPrimitive
[ERROR] Stack Trace:
[ERROR] java.lang.NullPointerException: Cannot invoke "com.sun.tools.javac.tree.JCTree.getStartPosition()" because "tree" is null
[ERROR] at com.google.errorprone.util.ASTHelpers.getStartPosition(ASTHelpers.java:1930)
[ERROR] at com.google.errorprone.util.ASTHelpers.hasExplicitSource(ASTHelpers.java:2122)
[ERROR] at com.google.errorprone.fixes.SuggestedFixes.replaceVariableType(SuggestedFixes.java:1866)
[ERROR] at com.google.errorprone.bugpatterns.VarWithPrimitive.matchVariable(VarWithPrimitive.java:46)
[ERROR] at com.google.errorprone.scanner.ErrorProneScanner.processMatchers(ErrorProneScanner.java:541)
[ERROR] at com.google.errorprone.scanner.ErrorProneScanner.visitVariable(ErrorProneScanner.java:1093)
[ERROR] at com.google.errorprone.scanner.ErrorProneScanner.visitVariable(ErrorProneScanner.java:180)
[ERROR] at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCVariableDecl.accept(JCTree.java:1109)
[ERROR] at jdk.compiler/com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:92)
[ERROR] at com.google.errorprone.scanner.Scanner.scan(Scanner.java:74)
[ERROR] at com.google.errorprone.scanner.Scanner.scan(Scanner.java:48)
[ERROR] at jdk.compiler/com.sun.source.util.TreeScanner.scan(TreeScanner.java:110)
[ERROR] at jdk.compiler/com.sun.source.util.TreeScanner.visitLambdaExpression(TreeScanner.java:647)
[ERROR] at com.google.errorprone.scanner.ErrorProneScanner.visitLambdaExpression(ErrorProneScanner.java:846)
[ERROR] at com.google.errorprone.scanner.ErrorProneScanner.visitLambdaExpression(ErrorProneScanner.java:180)
[ERROR] at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCLambda.accept(JCTree.java:2067)
[ERROR] at jdk.compiler/com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:92)
[ERROR] at com.google.errorprone.scanner.Scanner.scan(Scanner.java:74)
[ERROR] at com.google.errorprone.scanner.Scanner.scan(Scanner.java:48)
[ERROR] at jdk.compiler/com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:95)
[ERROR] at jdk.compiler/com.sun.source.util.TreeScanner.visitVariable(TreeScanner.java:242)
[ERROR] at com.google.errorprone.scanner.ErrorProneScanner.visitVariable(ErrorProneScanner.java:1094)
[ERROR] at com.google.errorprone.scanner.ErrorProneScanner.visitVariable(ErrorProneScanner.java:180)
[ERROR] at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCVariableDecl.accept(JCTree.java:1109)
[ERROR] at jdk.compiler/com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:92)
[ERROR] at com.google.errorprone.scanner.Scanner.scan(Scanner.java:74)
[ERROR] at com.google.errorprone.scanner.Scanner.scan(Scanner.java:48)
[ERROR] at jdk.compiler/com.sun.source.util.TreeScanner.scan(TreeScanner.java:110)
[ERROR] at jdk.compiler/com.sun.source.util.TreeScanner.visitBlock(TreeScanner.java:271)
[ERROR] at com.google.errorprone.scanner.ErrorProneScanner.visitBlock(ErrorProneScanner.java:623)
[ERROR] at com.google.errorprone.scanner.ErrorProneScanner.visitBlock(ErrorProneScanner.java:180)
[ERROR] at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:1173)
[ERROR] at jdk.compiler/com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:92)
[ERROR] at com.google.errorprone.scanner.Scanner.scan(Scanner.java:74)
[ERROR] at com.google.errorprone.scanner.Scanner.scan(Scanner.java:48)
[ERROR] at jdk.compiler/com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:95)
[ERROR] at jdk.compiler/com.sun.source.util.TreeScanner.visitMethod(TreeScanner.java:223)
[ERROR] at com.google.errorprone.scanner.ErrorProneScanner.visitMethod(ErrorProneScanner.java:884)
[ERROR] at com.google.errorprone.scanner.ErrorProneScanner.visitMethod(ErrorProneScanner.java:180)
[ERROR] at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:1004)
[ERROR] at jdk.compiler/com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:92)
[ERROR] at com.google.errorprone.scanner.Scanner.scan(Scanner.java:74)
[ERROR] at com.google.errorprone.scanner.Scanner.scan(Scanner.java:48)
[ERROR] at jdk.compiler/com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:95)
[ERROR] at jdk.compiler/com.sun.source.util.TreeScanner.scan(TreeScanner.java:110)
[ERROR] at jdk.compiler/com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:118)
[ERROR] at jdk.compiler/com.sun.source.util.TreeScanner.visitClass(TreeScanner.java:202)
[ERROR] at com.google.errorprone.scanner.ErrorProneScanner.visitClass(ErrorProneScanner.java:651)
[ERROR] at com.google.errorprone.scanner.ErrorProneScanner.visitClass(ErrorProneScanner.java:180)
[ERROR] at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:911)
[ERROR] at jdk.compiler/com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:92)
[ERROR] at com.google.errorprone.scanner.Scanner.scan(Scanner.java:74)
[ERROR] at com.google.errorprone.scanner.Scanner.scan(Scanner.java:48)
[ERROR] at jdk.compiler/com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:95)
[ERROR] at jdk.compiler/com.sun.source.util.TreeScanner.scan(TreeScanner.java:110)
[ERROR] at jdk.compiler/com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:118)
[ERROR] at jdk.compiler/com.sun.source.util.TreeScanner.visitCompilationUnit(TreeScanner.java:151)
[ERROR] at com.google.errorprone.scanner.ErrorProneScanner.visitCompilationUnit(ErrorProneScanner.java:663)
[ERROR] at com.google.errorprone.scanner.ErrorProneScanner.visitCompilationUnit(ErrorProneScanner.java:180)
[ERROR] at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCCompilationUnit.accept(JCTree.java:639)
[ERROR] at jdk.compiler/com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:66)
[ERROR] at com.google.errorprone.scanner.Scanner.scan(Scanner.java:58)
[ERROR] at com.google.errorprone.scanner.ErrorProneScannerTransformer.apply(ErrorProneScannerTransformer.java:43)
[ERROR] at com.google.errorprone.ErrorProneAnalyzer.finished(ErrorProneAnalyzer.java:231)
[ERROR] at jdk.compiler/com.sun.tools.javac.api.MultiTaskListener.finished(MultiTaskListener.java:133)
[ERROR] at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.flow(JavaCompiler.java:1426)
[ERROR] at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.flow(JavaCompiler.java:1373)
[ERROR] at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:959)
[ERROR] at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.lambda$doCall$0(JavacTaskImpl.java:106)
[ERROR] at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.invocationHelper(JavacTaskImpl.java:154)
[ERROR] at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.doCall(JavacTaskImpl.java:102)
[ERROR] at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.call(JavacTaskImpl.java:96)
[ERROR] at org.codehaus.plexus.compiler.javac.JavaxToolsCompiler.compileInProcess(JavaxToolsCompiler.java:126)
[ERROR] at org.codehaus.plexus.compiler.javac.JavacCompiler.performCompile(JavacCompiler.java:337)
[ERROR] at org.apache.maven.plugin.compiler.AbstractCompilerMojo.executeReal(AbstractCompilerMojo.java:1236)
[ERROR] at org.apache.maven.plugin.compiler.AbstractCompilerMojo.execute(AbstractCompilerMojo.java:708)
[ERROR] at org.apache.maven.plugin.compiler.CompilerMojo.execute(CompilerMojo.java:235)
[ERROR] at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:126)
[ERROR] at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute2(MojoExecutor.java:328)
[ERROR] at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute(MojoExecutor.java:316)
[ERROR] at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:212)
[ERROR] at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:174)
[ERROR] at org.apache.maven.lifecycle.internal.MojoExecutor.access$000(MojoExecutor.java:75)
[ERROR] at org.apache.maven.lifecycle.internal.MojoExecutor$1.run(MojoExecutor.java:162)
[ERROR] at org.apache.maven.plugin.DefaultMojosExecutionStrategy.execute(DefaultMojosExecutionStrategy.java:39)
[ERROR] at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:159)
[ERROR] at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:105)
[ERROR] at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:73)
[ERROR] at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:53)
[ERROR] at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:118)
[ERROR] at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:261)
[ERROR] at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:173)
[ERROR] at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:101)
[ERROR] at org.apache.maven.cli.MavenCli.execute(MavenCli.java:919)
[ERROR] at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:285)
[ERROR] at org.apache.maven.cli.MavenCli.main(MavenCli.java:207)
[ERROR] at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
[ERROR] at java.base/java.lang.reflect.Method.invoke(Method.java:583)
[ERROR] at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:255)
[ERROR] at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:201)
[ERROR] at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:362)
[ERROR] at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:314)
[ERROR] at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
[ERROR] at java.base/java.lang.reflect.Method.invoke(Method.java:583)
[ERROR] at org.apache.maven.wrapper.BootstrapMainStarter.start(BootstrapMainStarter.java:52)
[ERROR] at org.apache.maven.wrapper.WrapperExecutor.execute(WrapperExecutor.java:161)
[ERROR] at org.apache.maven.wrapper.MavenWrapperMain.main(MavenWrapperMain.java:73)
On OpenJDK 27,
VarWithPrimitivecrashes when presented with a lambda that implements a method with a primitive typed parameter if that parameter is left untyped:The crash does not manifest on OpenJDK 21-26 or for reference type-only parameter lists and is not affected by parameter list parentheses, the lambda body, or whether RHS is explicitly cast to the expected type.
vardoes not need to appear anywhere in the file.(Also,
VarWithPrimitiveis not listed in https://github.com/google/error-prone/releases/tag/v2.50.0.)