JDK-8058322 : Zero name_index item of MethodParameters attribute cause MalformedParameterException.
- Type: Bug
- Component: core-libs
- Sub-Component: java.lang:reflect
- Affected Version: 8,9
- Priority: P4
- Status: Resolved
- Resolution: Fixed
- Submitted: 2014-09-12
- Updated: 2025-09-13
- Resolved: 2014-11-11
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| JDK 9 | Other | Other |
|---|---|---|
9 b42Fixed  |
openjdk8u442Fixed | openjdk8u442,shenandoah8u442Fixed |
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Description
JVMS says:
"If the value of the name_index item is zero, then this parameters element indicates a formal parameter with no name. "
But j.l.r.Executable.getParameters() throw MalformedParameterExeption: Invalid parameter name "".
This looks as if parameter had empty-string name.
It is reproduced on Solaris with 8, 8u26, 9 and 9.0
and on Windows 7 with 8u20.
Minimized test:
------------------------------------------------------------
public class Second {
public static String method(int i){
return "in";
}
public static void main(String[] args) throws NoSuchMethodException {
Second.class.getMethod("method", int.class).getParameters();
}
}
------------------------------------------------------------
After compilation (javac -parameters Second.java) MethodParameters attribute of "method" was changed from "0x0100110000;" to "0x0100000000;". Modified version is attached.
The following JCK test will fail due to this bug: vm/classfmt/atr/atrmtp003/atrmtp00303m1/atrmtp00303m1.
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