Compilation error on a simple console app

dodyg · June 6, 2012, 4:43pm

``



package ronin
import java.io.BufferedReader

import java.io.InputStreamReader

import java.io.IOException
fun main(args : Array<String>){

  System.out.print("what is good for you? ")

  var bufferRead = BufferedReader(InputStreamReader(System.in));

  var s = bufferRead.readLine();

}

Above code generates below’s error. It highlights the “(System.in”) expression.

``



org.jetbrains.jet.codegen.CompilationException: Back-end (JVM) Internal error: null
Cause: java.lang.NullPointerException
File being compiled and position: (18,55) in F:RepositoryDocDroidSamplesRoninsrcMain.kt
The root cause was thrown at: ExpressionCodegen.java:906
at org.jetbrains.jet.codegen.ExpressionCodegen.genQualified(ExpressionCodegen.java:171)
at org.jetbrains.jet.codegen.ExpressionCodegen.gen(ExpressionCodegen.java:176)
at org.jetbrains.jet.codegen.ExpressionCodegen.gen(ExpressionCodegen.java:180)
at org.jetbrains.jet.codegen.ExpressionCodegen.pushMethodArguments(ExpressionCodegen.java:1526)
at org.jetbrains.jet.codegen.ExpressionCodegen.pushMethodArguments(ExpressionCodegen.java:1619)
at org.jetbrains.jet.codegen.ExpressionCodegen.invokeMethodWithArguments(ExpressionCodegen.java:1393)
at org.jetbrains.jet.codegen.ExpressionCodegen.generateJavaConstructorCall(ExpressionCodegen.java:2366)
at org.jetbrains.jet.codegen.ExpressionCodegen.generateConstructorCall(ExpressionCodegen.java:2320)
at org.jetbrains.jet.codegen.ExpressionCodegen.visitCallExpression(ExpressionCodegen.java:1273)
at org.jetbrains.jet.codegen.ExpressionCodegen.visitCallExpression(ExpressionCodegen.java:60)
at org.jetbrains.jet.lang.psi.JetCallExpression.accept(JetCallExpression.java:45)
at org.jetbrains.jet.codegen.ExpressionCodegen.genQualified(ExpressionCodegen.java:161)
at org.jetbrains.jet.codegen.ExpressionCodegen.gen(ExpressionCodegen.java:176)
at org.jetbrains.jet.codegen.ExpressionCodegen.gen(ExpressionCodegen.java:180)
at org.jetbrains.jet.codegen.ExpressionCodegen.pushMethodArguments(ExpressionCodegen.java:1526)
at org.jetbrains.jet.codegen.ExpressionCodegen.pushMethodArguments(ExpressionCodegen.java:1619)
at org.jetbrains.jet.codegen.ExpressionCodegen.invokeMethodWithArguments(ExpressionCodegen.java:1393)
at org.jetbrains.jet.codegen.ExpressionCodegen.generateJavaConstructorCall(ExpressionCodegen.java:2366)
at org.jetbrains.jet.codegen.ExpressionCodegen.generateConstructorCall(ExpressionCodegen.java:2320)
at org.jetbrains.jet.codegen.ExpressionCodegen.visitCallExpression(ExpressionCodegen.java:1273)
at org.jetbrains.jet.codegen.ExpressionCodegen.visitCallExpression(ExpressionCodegen.java:60)
at org.jetbrains.jet.lang.psi.JetCallExpression.accept(JetCallExpression.java:45)
at org.jetbrains.jet.codegen.ExpressionCodegen.genQualified(ExpressionCodegen.java:161)
at org.jetbrains.jet.codegen.ExpressionCodegen.gen(ExpressionCodegen.java:176)
at org.jetbrains.jet.codegen.ExpressionCodegen.gen(ExpressionCodegen.java:180)
at org.jetbrains.jet.codegen.ExpressionCodegen.visitProperty(ExpressionCodegen.java:2303)
at org.jetbrains.jet.codegen.ExpressionCodegen.visitProperty(ExpressionCodegen.java:60)
at org.jetbrains.jet.lang.psi.JetProperty.accept(JetProperty.java:51)
at org.jetbrains.jet.codegen.ExpressionCodegen.genQualified(ExpressionCodegen.java:161)
at org.jetbrains.jet.codegen.ExpressionCodegen.gen(ExpressionCodegen.java:176)
at org.jetbrains.jet.codegen.ExpressionCodegen.gen(ExpressionCodegen.java:180)
at org.jetbrains.jet.codegen.ExpressionCodegen.generateBlock(ExpressionCodegen.java:871)
at org.jetbrains.jet.codegen.ExpressionCodegen.visitBlockExpression(ExpressionCodegen.java:737)
at org.jetbrains.jet.codegen.ExpressionCodegen.visitBlockExpression(ExpressionCodegen.java:60)
at org.jetbrains.jet.lang.psi.JetBlockExpression.accept(JetBlockExpression.java:50)
at org.jetbrains.jet.codegen.ExpressionCodegen.genQualified(ExpressionCodegen.java:161)
at org.jetbrains.jet.codegen.ExpressionCodegen.gen(ExpressionCodegen.java:176)
at org.jetbrains.jet.codegen.ExpressionCodegen.returnExpression(ExpressionCodegen.java:951)
at org.jetbrains.jet.codegen.FunctionCodegen.generatedMethod(FunctionCodegen.java:241)
at org.jetbrains.jet.codegen.FunctionCodegen.generateMethod(FunctionCodegen.java:75)
at org.jetbrains.jet.codegen.FunctionCodegen.gen(FunctionCodegen.java:65)
at org.jetbrains.jet.codegen.MemberCodegen.generateFunctionOrProperty(MemberCodegen.java:45)
at org.jetbrains.jet.codegen.NamespaceCodegen.generate(NamespaceCodegen.java:63)
at org.jetbrains.jet.codegen.GenerationState.generateNamespace(GenerationState.java:149)
at org.jetbrains.jet.codegen.GenerationState.compileCorrectFiles(GenerationState.java:132)
at org.jetbrains.jet.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.generate(KotlinToJVMBytecodeCompiler.java:279)
at org.jetbrains.jet.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.analyzeAndGenerate(KotlinToJVMBytecodeCompiler.java:232)
at org.jetbrains.jet.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.analyzeAndGenerate(KotlinToJVMBytecodeCompiler.java:216)
at org.jetbrains.jet.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.compileModule(KotlinToJVMBytecodeCompiler.java:80)
at org.jetbrains.jet.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.compileModules(KotlinToJVMBytecodeCompiler.java:101)
at org.jetbrains.jet.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.java:104)
at org.jetbrains.jet.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.java:48)
at org.jetbrains.jet.cli.common.CLICompiler.exec(CLICompiler.java:114)
at org.jetbrains.jet.cli.jvm.K2JVMCompiler.exec(K2JVMCompiler.java:175)
at org.jetbrains.jet.cli.jvm.K2JVMCompiler.exec(K2JVMCompiler.java:48)
at org.jetbrains.jet.cli.common.CLICompiler.exec(CLICompiler.java:44)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.jetbrains.jet.plugin.compiler.CompilerUtils.invokeExecMethod(CompilerUtils.java:175)
at org.jetbrains.jet.plugin.compiler.JetCompiler.execInProcess(JetCompiler.java:249)
at org.jetbrains.jet.plugin.compiler.JetCompiler.access$000(JetCompiler.java:55)
at org.jetbrains.jet.plugin.compiler.JetCompiler$1.invoke(JetCompiler.java:236)
at org.jetbrains.jet.plugin.compiler.JetCompiler$1.invoke(JetCompiler.java:233)
at org.jetbrains.jet.plugin.compiler.CompilerUtils.outputCompilerMessagesAndHandleExitCode(CompilerUtils.java:314)
at org.jetbrains.jet.plugin.compiler.JetCompiler.runInProcess(JetCompiler.java:233)
at org.jetbrains.jet.plugin.compiler.JetCompiler.runCompiler(JetCompiler.java:140)
at org.jetbrains.jet.plugin.compiler.JetCompiler.doCompile(JetCompiler.java:128)
at org.jetbrains.jet.plugin.compiler.JetCompiler.compile(JetCompiler.java:103)
at com.intellij.compiler.impl.CompileDriver.compileSources(CompileDriver.java:1931)
at com.intellij.compiler.impl.CompileDriver.translate(CompileDriver.java:1254)
at com.intellij.compiler.impl.CompileDriver.doCompile(CompileDriver.java:986)
at com.intellij.compiler.impl.CompileDriver.doCompile(CompileDriver.java:747)
at com.intellij.compiler.impl.CompileDriver.access$1000(CompileDriver.java:104)
at com.intellij.compiler.impl.CompileDriver$8.run(CompileDriver.java:665)
at com.intellij.compiler.progress.CompilerTask.run(CompilerTask.java:155)
at com.intellij.openapi.progress.impl.ProgressManagerImpl$TaskRunnable.run(ProgressManagerImpl.java:469)
at com.intellij.openapi.progress.impl.ProgressManagerImpl$2.run(ProgressManagerImpl.java:178)
at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:218)
at com.intellij.openapi.progress.impl.ProgressManagerImpl.runProcess(ProgressManagerImpl.java:169)
at com.intellij.openapi.progress.impl.ProgressManagerImpl$8.run(ProgressManagerImpl.java:378)
at com.intellij.openapi.application.impl.ApplicationImpl$6.run(ApplicationImpl.java:434)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
at com.intellij.openapi.application.impl.ApplicationImpl$1$1.run(ApplicationImpl.java:145)
Caused by: java.lang.NullPointerException
at org.jetbrains.jet.codegen.ExpressionCodegen.markLineNumber(ExpressionCodegen.java:906)
at org.jetbrains.jet.codegen.ExpressionCodegen.genQualified(ExpressionCodegen.java:159)
at org.jetbrains.jet.codegen.ExpressionCodegen.visitDotQualifiedExpression(ExpressionCodegen.java:1646)
at org.jetbrains.jet.codegen.ExpressionCodegen.visitDotQualifiedExpression(ExpressionCodegen.java:60)
at org.jetbrains.jet.lang.psi.JetDotQualifiedExpression.accept(JetDotQualifiedExpression.java:37)
at org.jetbrains.jet.codegen.ExpressionCodegen.genQualified(ExpressionCodegen.java:161)
... 89 more

abreslav · June 6, 2012, 5:13pm

Thanks for the report.

‘in’ is a keyword in Kotlin. The correc code is:

``

package ronin
import java.io.BufferedReader

import java.io.InputStreamReader

import java.io.IOException
fun main(args : Array<String>){

  System.out.print("what is good for you? ")

  var bufferRead = BufferedReader(InputStreamReader(System.in));

  var s = bufferRead.readLine();

}

abreslav · June 6, 2012, 5:41pm

THis is a bug in the compiler reporting subsystem: http://youtrack.jetbrains.com/issue/KT-2207

chammers · June 6, 2012, 5:55pm

"Sytem.`in`" looks very ugly.

Can’t you teach the parser that strings which directly follow a dot are always supposed to be identifiers and not operators?

abreslav · June 6, 2012, 6:15pm

Keywords exist for a reason: you can't name your field 'class', or 'if', nor you can name it 'in': it would confuse people and the parser.

Actually, this is not a problem, because you don’t need to use ‘System.in’ (or ‘System.out’) in Kotlin. See the API docs for standard IO functions:
http://jetbrains.github.com/kotlin/versions/snapshot/apidocs/index.html

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Compilation error on a simple console app

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