JDK-7071246 : Enclosing string literal in parenthesis in switch-case crashes javac
- Type: Bug
- Component: tools
- Sub-Component: javac
- Affected Version: 7
- Priority: P4
- Status: Closed
- Resolution: Fixed
- OS:
linux_redhat_4.0,solaris_10,windows_xp,windows_vista,windows_7 linux_redhat_4.0,solaris_10,windows_xp,windows_vista,windows_7
- CPU: x86,sparc
- Submitted: 2011-07-26
- Updated: 2018-03-07
- Resolved: 2012-02-24
The Version table provides details related to the release that this issue/RFE will be addressed.
Unresolved : Release in which this issue/RFE will be addressed.
Resolved: Release in which this issue/RFE has been resolved.
Fixed : Release in which this issue/RFE has been fixed. The release containing this fix may be available for download as an Early Access Release or a General Availability Release.
To download the current JDK release, click here.
Unresolved : Release in which this issue/RFE will be addressed.
Resolved: Release in which this issue/RFE has been resolved.
Fixed : Release in which this issue/RFE has been fixed. The release containing this fix may be available for download as an Early Access Release or a General Availability Release.
To download the current JDK release, click here.
| JDK 7 | JDK 8 |
|---|---|
7u2Fixed  |
8 b01Fixed |
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Description
FULL PRODUCT VERSION :
java version "1.7.0"
Java(TM) SE Runtime Environment (build 1.7.0-b147)
Java HotSpot(TM) Client VM (build 21.0-b17, mixed mode, sharing)
ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.1.7601]
EXTRA RELEVANT SYSTEM CONFIGURATION :
PROCESSOR_ARCHITECTURE=AMD64
PROCESSOR_IDENTIFIER=Intel64 Family 6 Model 23 Stepping 6, GenuineInte
PROCESSOR_LEVEL=6
PROCESSOR_REVISION=1706
ProgramData=C:\ProgramData
ProgramFiles=C:\Program Files
ProgramFiles(x86)=C:\Program Files (x86)
ProgramW6432=C:\Program Files
SESSIONNAME=Console
SystemDrive=C:
SystemRoot=C:\Windows
A DESCRIPTION OF THE PROBLEM :
Running javac on a program which contains a string literal enclosed in parenthesis like in the example listed below causes javac to throw NullPointerException and terminate.
...
switch (s) {
case ("xyz"): // enclosing the string literal in parenthesis causes javac to crash
...
}
...
Note:
- Removing the parenthesis from this program helps resolve the issue.
- Replacing the String with int in the example will not reproduce this issue and hence using parenthesis with int literal in 'case' is handled well.
STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Create a file named Test.java with the following content:
=== Begin file Test.java ===
public class Test {
public static void main(String args[]) {
switch(args[0]) {
case("hello"):
System.out.println("hello!!");
break;
default:
System.out.println("hi!");
}
}
}
=== End of file Test.java ===
Save the file and execute the following from the command prompt:
javac Test.java
EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Test.class is expected to be created as a result of successful compilation.
ACTUAL -
javac crashes with the following error message:
C:\Temp>"C:\Program Files (x86)\Java\jdk1.7.0\bin\javac.exe" Test.java
An exception has occurred in the compiler (1.7.0). Please file a bug at the Java Developer Connection (http://java.sun.com/webapps/bugreport) after checking the Bug Parade for duplicates. Include your program and the following diagnostic in your report. Thank you.
java.lang.NullPointerException
at com.sun.tools.javac.comp.Lower.visitStringSwitch(Lower.java:3456)
at com.sun.tools.javac.comp.Lower.visitSwitch(Lower.java:3357)
at com.sun.tools.javac.tree.JCTree$JCSwitch.accept(JCTree.java:959)
at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)
at com.sun.tools.javac.comp.Lower.translate(Lower.java:2160)
at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:70)
at com.sun.tools.javac.tree.TreeTranslator.visitBlock(TreeTranslator.java:160)
at com.sun.tools.javac.comp.Lower.visitBlock(Lower.java:3311)
at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:781)
at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)
at com.sun.tools.javac.comp.Lower.translate(Lower.java:2160)
at com.sun.tools.javac.tree.TreeTranslator.visitMethodDef(TreeTranslator.java:144)
at com.sun.tools.javac.comp.Lower.visitMethodDefInternal(Lower.java:2619)
at com.sun.tools.javac.comp.Lower.visitMethodDef(Lower.java:2538)
at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:669)
at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)
at com.sun.tools.javac.comp.Lower.translate(Lower.java:2160)
at com.sun.tools.javac.comp.Lower.visitClassDef(Lower.java:2283)
at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:591)
at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)
at com.sun.tools.javac.comp.Lower.translate(Lower.java:2160)
at com.sun.tools.javac.comp.Lower.translate(Lower.java:2180)
at com.sun.tools.javac.comp.Lower.translateTopLevelClass(Lower.java:3650)
at com.sun.tools.javac.main.JavaCompiler.desugar(JavaCompiler.java:1393)
at com.sun.tools.javac.main.JavaCompiler.desugar(JavaCompiler.java:1271)
at com.sun.tools.javac.main.JavaCompiler.compile2(JavaCompiler.java:870)
at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:829)
at com.sun.tools.javac.main.Main.compile(Main.java:417)
at com.sun.tools.javac.main.Main.compile(Main.java:331)
at com.sun.tools.javac.main.Main.compile(Main.java:322)
at com.sun.tools.javac.Main.compile(Main.java:76)
at com.sun.tools.javac.Main.main(Main.java:61)
C:\Temp>
ERROR MESSAGES/STACK TRACES THAT OCCUR :
C:\Temp>"C:\Program Files (x86)\Java\jdk1.7.0\bin\javac.exe" Test.java
An exception has occurred in the compiler (1.7.0). Please file a bug at the Java Developer Connection (http://java.sun.com/webapps/bugreport) after checking the Bug Parade for duplicates. Include your program and the following diagnostic in your report. Thank you.
java.lang.NullPointerException
at com.sun.tools.javac.comp.Lower.visitStringSwitch(Lower.java:3456)
at com.sun.tools.javac.comp.Lower.visitSwitch(Lower.java:3357)
at com.sun.tools.javac.tree.JCTree$JCSwitch.accept(JCTree.java:959)
at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)
at com.sun.tools.javac.comp.Lower.translate(Lower.java:2160)
at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:70)
at com.sun.tools.javac.tree.TreeTranslator.visitBlock(TreeTranslator.java:160)
at com.sun.tools.javac.comp.Lower.visitBlock(Lower.java:3311)
at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:781)
at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)
at com.sun.tools.javac.comp.Lower.translate(Lower.java:2160)
at com.sun.tools.javac.tree.TreeTranslator.visitMethodDef(TreeTranslator.java:144)
at com.sun.tools.javac.comp.Lower.visitMethodDefInternal(Lower.java:2619)
at com.sun.tools.javac.comp.Lower.visitMethodDef(Lower.java:2538)
at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:669)
at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)
at com.sun.tools.javac.comp.Lower.translate(Lower.java:2160)
at com.sun.tools.javac.comp.Lower.visitClassDef(Lower.java:2283)
at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:591)
at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)
at com.sun.tools.javac.comp.Lower.translate(Lower.java:2160)
at com.sun.tools.javac.comp.Lower.translate(Lower.java:2180)
at com.sun.tools.javac.comp.Lower.translateTopLevelClass(Lower.java:3650)
at com.sun.tools.javac.main.JavaCompiler.desugar(JavaCompiler.java:1393)
at com.sun.tools.javac.main.JavaCompiler.desugar(JavaCompiler.java:1271)
at com.sun.tools.javac.main.JavaCompiler.compile2(JavaCompiler.java:870)
at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:829)
at com.sun.tools.javac.main.Main.compile(Main.java:417)
at com.sun.tools.javac.main.Main.compile(Main.java:331)
at com.sun.tools.javac.main.Main.compile(Main.java:322)
at com.sun.tools.javac.Main.compile(Main.java:76)
at com.sun.tools.javac.Main.main(Main.java:61)
C:\Temp>
REPRODUCIBILITY :
This bug can be reproduced always.
---------- BEGIN SOURCE ----------
//
// File name: Test.java
//
public class Test {
public static void main(String args[]) {
switch(args[0]) {
case("hello"):
System.out.println("hello!!");
break;
default:
System.out.println("hi!");
}
}
}
=== End of file Test.java ===
---------- END SOURCE ----------
CUSTOMER SUBMITTED WORKAROUND :
Remove the parenthesis from around the sting literal:
=== Begin file Test.java ===
public class Test {
public static void main(String args[]) {
switch(args[0]) {
case "hello": // workaround is to remove the parenthesis
System.out.println("hello!!");
break;
default:
System.out.println("hi!");
}
}
}
=== End of file Test.java ===
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