JDK-6966357 : javac 7 regression handling generic return type in Ini4J library
- Type: Bug
- Component: tools
- Sub-Component: javac
- Affected Version: 7
- Priority: P2
- Status: Closed
- Resolution: Duplicate
- OS: linux
- CPU: x86
- Submitted: 2010-07-02
- Updated: 2013-03-15
- Resolved: 2010-12-07
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| JDK 7 |
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7Resolved  |
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Description
Consider this program using http://hg.netbeans.org/binaries/50986B7D247AF02C3DC25CB26B5FC7D5CF1340E6-ini4j-0.4.1.jar as a library:
---%<---
import org.ini4j.Ini;
public class Demo {
public Demo() {
Ini.Section s = new Ini().get("section");
}
}
---%<---
JDK 6's javac accepts this but JDK 7 rejects it with:
Demo.java:4: incompatible types
Ini.Section s = new Ini().get("section");
required: Ini.Section
found: Object
javap for the library reports:
public class org.ini4j.Ini extends org.ini4j.MultiMapImpl<java.lang.String, org.ini4j.Ini$Section> {
// nothing more of interest...
}
public class org.ini4j.MultiMapImpl<K extends java.lang.Object, V extends java.lang.Object> extends java.lang.Object implements org.ini4j.MultiMap<K, V> {
// ...
public V get(java/lang/Object);
public V get(java/lang/Object, int);
// ...
}
public interface org.ini4j.MultiMap<K extends java.lang.Object, V extends java.lang.Object> extends java.lang.Object implements java.util.Map<K, V> {
// ...
public abstract V get(java/lang/Object, int);
// ...
}
Since Ini is a MultiMapImpl<String,Ini.Section>, get(Object) on it should return Ini.Section.
Ini.Section.get(String) is similarly affected; should return String but JDK 7 javac considers it to return Object.
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