I'm trying to modify a public static final String[] field I made in ClassA, and then modify it in ClassB using reflection. However I get a NoSuchFieldException.
java.lang.NoSuchFieldException: test
at java.lang.Class.getField(Unknown Source)
at packageA.ClassA.<init>(ClassA.java:17)
ClassA is located in packageA and ClassB is located in packageB if that matters.
Class A, creates the field and calls ClassB:
package packageA;
import packageB.ClassB;
public class ClassA {
// Create final String[]
public static final String[] test = new String[] {"Test1", "Test2", "Test3"};
public ClassA() {
// Output array content before change
for (int i = 0; i < test.length; i++) {
System.out.println(test[i]);
}
// Change array content
try {
new ClassB(String[].class.getField("test"), new String[] {"Change1", "Change2", "Change3"});
} catch (Exception e) {
e.printStackTrace();
}
// Output array content after change
for (int i = 0; i < test.length; i++) {
System.out.println(test[i]);
}
}
}
Class B, Modifies the 'test' array:
package packageB;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
public class ClassB {
public ClassB(Field field, Object newValue) {
try {
field.setAccessible(true);
Field modifiersField = Field.class.getDeclaredField("modifiers");
modifiersField.setAccessible(true);
modifiersField.setInt(field, field.getModifiers() & ~Modifier.FINAL);
field.set(null, newValue);
} catch (Exception e) {
e.printStackTrace();
}
}
}
Note: I got ClassB from here and I also saw this post but I couldn't find anything that worked.
From what i've gathered from that topic, I think the exception means that it doesn't know what 'test' is in ClassB and that I haven't initialized it in ClassB, but I couldn't really figure that out.
