The following program demonstrates a problem with generics, inner classes
and reflection:

$ cat -n Test.java
     1
     2 import java.lang.reflect.Field;
     3 import java.lang.reflect.Type;
     4
     5 public class Test
     6 {
     7 p1.Test3.Inner<Integer> _field;
     8
     9 public static void main(String[] args) throws Exception {
    10 Class test = Test.class;
    11 Field f = test.getDeclaredField("_field");
    12 Type t = f.getGenericType();
    13 System.out.println("type = " + t);
    14 }
    15
    16 }
$ cat -n Test3.java
     1 package p1;
     2
     3 public class Test3 {
     4 public class Inner<T> { T get() { return null; } }
     5 }
$ javac -d . Test.java Test3.java
$ java -cp . Test
type = p1.Test3.p1.Test3$Inner<java.lang.Integer>


The output is wrong and should have been:

type = p1.Test3$Inner<java.lang.Integer>

The signature generated by javac might be undesirable, but it
follows the spec.