[GROOVY-10046] NPE in static compiler

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.0.8
• Fix Version/s: 4.0.0-beta-1, 3.0.9
• Component/s: Static compilation
• Assignee: Eric Milles
• Reporter: Christopher Smith
• Created: 20/Apr/21 21:09
• Updated: 03/Feb/22 22:34
• Resolved: 22/Apr/21 15:41

Description

I produced this example as a repro for a bug in generic inference (I think perhaps having to do with the reuse of the generic bound T in Collectors.toMap), but I found that it triggers an NPE in the static compiler. @TypeChecked does not have a problem.

import static java.util.stream.Collectors.toMap

import java.util.stream.Stream

import groovy.transform.CompileStatic

@CompileStatic
class GroovyAbc {
    static class Record {
        String name
        Integer quantity
    }

    void demo() {
        Stream.of(new Record(name: 'foo', quantity: 3))
            .collect(
                toMap(
                    Record::getName,
                    Record::getQuantity
                )
            )
    }
}

[ERROR] groovy.lang.GroovyRuntimeException: NullPointerException while processing GroovyAbc.groovy. /home/christopher/git/path/bugs/GroovyAbc.groovy
[ERROR]         at org.codehaus.groovy.classgen.AsmClassGenerator.visitClass(AsmClassGenerator.java:294)
[ERROR]         at org.codehaus.groovy.control.CompilationUnit$3.call(CompilationUnit.java:797)
[ERROR]         at org.codehaus.groovy.control.CompilationUnit$IPrimaryClassNodeOperation.doPhaseOperation(CompilationUnit.java:942)
[ERROR]         at org.codehaus.groovy.control.CompilationUnit.processPhaseOperations(CompilationUnit.java:671)
[ERROR]         at org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.java:635)
[ERROR]         at org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.java:610)
[ERROR]         at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[ERROR]         at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[ERROR]         at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[ERROR]         at java.base/java.lang.reflect.Method.invoke(Method.java:566)
[ERROR]         at org.codehaus.gmavenplus.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:214)
[ERROR]         at org.codehaus.gmavenplus.mojo.AbstractCompileMojo.doCompile(AbstractCompileMojo.java:288)
[ERROR]         at org.codehaus.gmavenplus.mojo.CompileTestsMojo.execute(CompileTestsMojo.java:76)
[ERROR]         at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:137)
[ERROR]         at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:210)
[ERROR]         at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:156)
[ERROR]         at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:148)
[ERROR]         at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:117)
[ERROR]         at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:81)
[ERROR]         at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:56)
[ERROR]         at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)
[ERROR]         at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:305)
[ERROR]         at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:192)
[ERROR]         at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:105)
[ERROR]         at org.apache.maven.cli.MavenCli.execute(MavenCli.java:956)
[ERROR]         at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:288)
[ERROR]         at org.apache.maven.cli.MavenCli.main(MavenCli.java:192)
[ERROR]         at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[ERROR]         at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[ERROR]         at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[ERROR]         at java.base/java.lang.reflect.Method.invoke(Method.java:566)
[ERROR]         at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:282)
[ERROR]         at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:225)
[ERROR]         at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:406)
[ERROR]         at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:347)
[ERROR] Caused by: java.lang.NullPointerException
[ERROR]         at org.codehaus.groovy.classgen.asm.sc.StaticTypesMethodReferenceExpressionWriter.createParametersWithExactType(StaticTypesMethodReferenceExpressionWriter.java:283)
[ERROR]         at org.codehaus.groovy.classgen.asm.sc.StaticTypesMethodReferenceExpressionWriter.writeMethodReferenceExpression(StaticTypesMethodReferenceExpressionWriter.java:107)
[ERROR]         at org.codehaus.groovy.classgen.AsmClassGenerator.visitMethodReferenceExpression(AsmClassGenerator.java:786)
[ERROR]         at org.codehaus.groovy.ast.expr.MethodReferenceExpression.visit(MethodReferenceExpression.java:34)
[ERROR]         at org.codehaus.groovy.classgen.asm.sc.StaticInvocationWriter.visitArgument(StaticInvocationWriter.java:514)
[ERROR]         at org.codehaus.groovy.classgen.asm.sc.StaticInvocationWriter.loadArguments(StaticInvocationWriter.java:461)
[ERROR]         at org.codehaus.groovy.classgen.asm.InvocationWriter.writeDirectMethodCall(InvocationWriter.java:208)
[ERROR]         at org.codehaus.groovy.classgen.asm.sc.StaticInvocationWriter.writeDirectMethodCall(StaticInvocationWriter.java:387)
[ERROR]         at org.codehaus.groovy.classgen.asm.InvocationWriter.makeDirectCall(InvocationWriter.java:299)
[ERROR]         at org.codehaus.groovy.classgen.asm.sc.StaticInvocationWriter.makeDirectCall(StaticInvocationWriter.java:133)
[ERROR]         at org.codehaus.groovy.classgen.asm.InvocationWriter.makeCall(InvocationWriter.java:381)
[ERROR]         at org.codehaus.groovy.classgen.asm.InvocationWriter.makeCall(InvocationWriter.java:121)
[ERROR]         at org.codehaus.groovy.classgen.asm.sc.StaticInvocationWriter.makeCall(StaticInvocationWriter.java:649)
[ERROR]         at org.codehaus.groovy.classgen.asm.InvocationWriter.writeInvokeMethod(InvocationWriter.java:456)
[ERROR]         at org.codehaus.groovy.classgen.asm.sc.StaticInvocationWriter.writeInvokeMethod(StaticInvocationWriter.java:140)
[ERROR]         at org.codehaus.groovy.classgen.AsmClassGenerator.visitMethodCallExpression(AsmClassGenerator.java:844)
[ERROR]         at org.codehaus.groovy.ast.expr.MethodCallExpression.visit(MethodCallExpression.java:76)
[ERROR]         at org.codehaus.groovy.classgen.asm.sc.StaticInvocationWriter.visitArgument(StaticInvocationWriter.java:514)
[ERROR]         at org.codehaus.groovy.classgen.asm.sc.StaticInvocationWriter.loadArguments(StaticInvocationWriter.java:461)
[ERROR]         at org.codehaus.groovy.classgen.asm.InvocationWriter.writeDirectMethodCall(InvocationWriter.java:208)
[ERROR]         at org.codehaus.groovy.classgen.asm.sc.StaticInvocationWriter.writeDirectMethodCall(StaticInvocationWriter.java:387)
[ERROR]         at org.codehaus.groovy.classgen.asm.InvocationWriter.makeDirectCall(InvocationWriter.java:299)
[ERROR]         at org.codehaus.groovy.classgen.asm.sc.StaticInvocationWriter.makeDirectCall(StaticInvocationWriter.java:133)
[ERROR]         at org.codehaus.groovy.classgen.asm.InvocationWriter.makeCall(InvocationWriter.java:381)
[ERROR]         at org.codehaus.groovy.classgen.asm.InvocationWriter.makeCall(InvocationWriter.java:121)
[ERROR]         at org.codehaus.groovy.classgen.asm.sc.StaticInvocationWriter.makeCall(StaticInvocationWriter.java:649)
[ERROR]         at org.codehaus.groovy.classgen.asm.InvocationWriter.writeInvokeMethod(InvocationWriter.java:456)
[ERROR]         at org.codehaus.groovy.classgen.asm.sc.StaticInvocationWriter.writeInvokeMethod(StaticInvocationWriter.java:140)
[ERROR]         at org.codehaus.groovy.classgen.AsmClassGenerator.visitMethodCallExpression(AsmClassGenerator.java:844)
[ERROR]         at org.codehaus.groovy.ast.expr.MethodCallExpression.visit(MethodCallExpression.java:76)
[ERROR]         at org.codehaus.groovy.classgen.asm.StatementWriter.writeExpressionStatement(StatementWriter.java:635)
[ERROR]         at org.codehaus.groovy.classgen.AsmClassGenerator.visitExpressionStatement(AsmClassGenerator.java:686)
[ERROR]         at org.codehaus.groovy.ast.stmt.ExpressionStatement.visit(ExpressionStatement.java:40)
[ERROR]         at org.codehaus.groovy.classgen.asm.StatementWriter.writeBlockStatement(StatementWriter.java:94)
[ERROR]         at org.codehaus.groovy.classgen.asm.sc.StaticTypesStatementWriter.writeBlockStatement(StaticTypesStatementWriter.java:78)
[ERROR]         at org.codehaus.groovy.classgen.AsmClassGenerator.visitBlockStatement(AsmClassGenerator.java:617)
[ERROR]         at org.codehaus.groovy.ast.stmt.BlockStatement.visit(BlockStatement.java:69)
[ERROR]         at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitClassCodeContainer(ClassCodeVisitorSupport.java:138)
[ERROR]         at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitConstructorOrMethod(ClassCodeVisitorSupport.java:111)
[ERROR]         at org.codehaus.groovy.classgen.AsmClassGenerator.visitStdMethod(AsmClassGenerator.java:461)
[ERROR]         at org.codehaus.groovy.classgen.AsmClassGenerator.visitConstructorOrMethod(AsmClassGenerator.java:408)
[ERROR]         at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitMethod(ClassCodeVisitorSupport.java:106)
[ERROR]         at org.codehaus.groovy.classgen.AsmClassGenerator.visitMethod(AsmClassGenerator.java:556)
[ERROR]         at org.codehaus.groovy.ast.ClassNode.visitMethods(ClassNode.java:1099)
[ERROR]         at org.codehaus.groovy.ast.ClassNode.visitContents(ClassNode.java:1092)
[ERROR]         at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitClass(ClassCodeVisitorSupport.java:52)
[ERROR]         at org.codehaus.groovy.classgen.AsmClassGenerator.visitClass(AsmClassGenerator.java:271)
[ERROR]         ... 34 more