add classes and methods needed for GNU Classpath compatibility

Most of these methods are stubs which throw
UnsupportedOperationExceptions for now.

classpath/java/lang/reflect/Field.java

@@ -101,6 +101,38 @@ public class Field<T> extends AccessibleObject {
     }
   }
 
+  public boolean getBoolean(Object instance) throws IllegalAccessException {
+    return ((Boolean) get(instance)).booleanValue();
+  }
+
+  public byte getByte(Object instance) throws IllegalAccessException {
+    return ((Byte) get(instance)).byteValue();
+  }
+
+  public short getShort(Object instance) throws IllegalAccessException {
+    return ((Short) get(instance)).shortValue();
+  }
+
+  public char getChar(Object instance) throws IllegalAccessException {
+    return ((Character) get(instance)).charValue();
+  }
+
+  public int getInt(Object instance) throws IllegalAccessException {
+    return ((Integer) get(instance)).intValue();
+  }
+
+  public float getFloat(Object instance) throws IllegalAccessException {
+    return ((Float) get(instance)).floatValue();
+  }
+
+  public long getLong(Object instance) throws IllegalAccessException {
+    return ((Long) get(instance)).longValue();
+  }
+
+  public double getDouble(Object instance) throws IllegalAccessException {
+    return ((Double) get(instance)).doubleValue();
+  }
+
   public void set(Object instance, Object value)
     throws IllegalAccessException
   {
@@ -162,6 +194,10 @@ public class Field<T> extends AccessibleObject {
     }
   }
 
+  public boolean isEnumConstant() {
+    throw new UnsupportedOperationException();
+  }
+
   private static native long getPrimitive
     (Object instance, int code, int offset);