Description Steve Northover 2014-02-18 11:05:23 EST

Here is a class that contains 3 methods.  The first method is the original, the second is the Eclipse Lambdification of the original, and the third is a possible correct lambdification of the first method.

package junk;

import java.lang.reflect.Field;
import java.security.AccessController;
import java.security.PrivilegedExceptionAction;

public class Junk7 {
    private static int readValue(final String name) throws Exception {
        final Class<?> clazz = Junk7.class;
        return AccessController.doPrivileged(
            new PrivilegedExceptionAction<Integer>() {
                public Integer run() throws Exception {
                    Field field = clazz.getDeclaredField(name);
                    field.setAccessible(true);
                    return field.getInt(clazz);
                }
            });
    }
    
    //BAD - result of bad lamdification by Eclipse (does not compile)
    private static int readValueBAD(final String name) throws Exception {
        final Class<?> clazz = Junk7.class;
        return AccessController.doPrivileged(
            () -> {
                Field field = clazz.getDeclaredField(name);
                field.setAccessible(true);
                return field.getInt(clazz);
            });
    }
    
    //GOOD - this is an example of possible good lambdification
    private static int readValueGOOD(final String name) throws Exception {
        final Class<?> clazz = Junk7.class;
        return AccessController.doPrivileged(
            (PrivilegedExceptionAction<Integer>) () -> {
                Field field = clazz.getDeclaredField(name);
                field.setAccessible(true);
                return field.getInt(clazz);
        });
    }
}