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From "Yuhau Lin (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (LANG-1190) TypeUtils.isAssignable throws NullPointerException when fromType has type variables and toType generic superclass specifies type variable
Date Mon, 07 Dec 2015 19:41:11 GMT

     [ https://issues.apache.org/jira/browse/LANG-1190?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Yuhau Lin updated LANG-1190:
----------------------------
    Description: 
import static org.apache.commons.lang3.reflect.TypeUtils.*;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Type;
import java.util.ArrayList;

public class Demonstration {

    public static <U> Iterable<U> someMethod() { return null; }
    
    public static class WorkingClass extends ArrayList { }
    public static class FailingClass extends ArrayList<Object> { }
    
    
    public static void main(String[] args) throws NoSuchMethodException, SecurityException,
IllegalAccessException, IllegalArgumentException, InvocationTargetException {
        Type fromType = Demonstration.class.getDeclaredMethod("someMethod").getGenericReturnType();
        Type workingToType = wildcardType().withLowerBounds(WorkingClass.class).build();
        Type failingToType = wildcardType().withLowerBounds(FailingClass.class).build();
        
        System.out.println(fromType);
        System.out.println(workingToType);
        System.out.println(failingToType);
        
        System.out.println(isAssignable(fromType, workingToType));
        System.out.println(isAssignable(fromType, failingToType));
    }
}

  was:
import static org.apache.commons.lang3.reflect.TypeUtils.*; 
 
import java.lang.reflect.InvocationTargetException; 
import java.lang.reflect.Type; 
import java.util.ArrayList; 
 
public class Demonstration { 
 
    public static <U> Iterable<U> someMethod() { return null; } 
     
    public static class WorkingClass extends ArrayList { } 
    public static class FailingClass extends ArrayList<Object> { } 
     
     
    public static void main(String[] args) throws NoSuchMethodException, SecurityException,
IllegalAccessException, IllegalArgumentException, InvocationTargetException { 
        Type fromType = Demonstration.class.getDeclaredMethod("someMethod").getGenericReturnType();

        Type workingToType = wildcardType().withLowerBounds(WorkingClass.class).build();

        Type failingToType = wildcardType().withLowerBounds(FailingClass.class).build();

         
        System.out.println(fromType); 
        System.out.println(workingToType); 
        System.out.println(failingToType); 
         
        System.out.println(isAssignable(fromType, workingToType)); 
        System.out.println(isAssignable(fromType, failingToType)); 
    } 
} 


> TypeUtils.isAssignable throws NullPointerException when fromType has type variables and
toType generic superclass specifies type variable
> -----------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: LANG-1190
>                 URL: https://issues.apache.org/jira/browse/LANG-1190
>             Project: Commons Lang
>          Issue Type: Bug
>          Components: lang.reflect.*
>    Affects Versions: 3.4
>            Reporter: Yuhau Lin
>
> import static org.apache.commons.lang3.reflect.TypeUtils.*;
> import java.lang.reflect.InvocationTargetException;
> import java.lang.reflect.Type;
> import java.util.ArrayList;
> public class Demonstration {
>     public static <U> Iterable<U> someMethod() { return null; }
>     
>     public static class WorkingClass extends ArrayList { }
>     public static class FailingClass extends ArrayList<Object> { }
>     
>     
>     public static void main(String[] args) throws NoSuchMethodException, SecurityException,
IllegalAccessException, IllegalArgumentException, InvocationTargetException {
>         Type fromType = Demonstration.class.getDeclaredMethod("someMethod").getGenericReturnType();
>         Type workingToType = wildcardType().withLowerBounds(WorkingClass.class).build();
>         Type failingToType = wildcardType().withLowerBounds(FailingClass.class).build();
>         
>         System.out.println(fromType);
>         System.out.println(workingToType);
>         System.out.println(failingToType);
>         
>         System.out.println(isAssignable(fromType, workingToType));
>         System.out.println(isAssignable(fromType, failingToType));
>     }
> }



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