Reflection

TypeToken TypeToken provides a way to dynamically resolve generic type arguments

static <K, V> TypeToken<Map<K, V>> mapToken(TypeToken<K> keyToken, TypeToken<V> valueToken) {
  return new TypeToken<Map<K, V>>() {}
    .where(new TypeParameter<K>() {}, keyToken)
    .where(new TypeParameter<V>() {}, valueToken);
}
...
TypeToken<Map<String, BigInteger>> mapToken = mapToken(
   TypeToken.of(String.class),
   TypeToken.of(BigInteger.class));
TypeToken<Map<Integer, Queue<String>>> complexToken = mapToken(
   TypeToken.of(Integer.class),
   new TypeToken<Queue<String>>() {});

Invokable Guava's Invokable is a fluent wrapper of java.lang.reflect.Method and java.lang.reflect.Constructor. It simplifies common reflective code using either.

Dynamic Proxies

JDK:

Foo foo = (Foo) Proxy.newProxyInstance(
    Foo.class.getClassLoader(),
    new Class<?>[] {Foo.class},
    invocationHandler);

Guava:

Foo foo = Reflection.newProxy(Foo.class, invocationHandler);