java.lang.RuntimeException: Unexpected failure when returning from an RPC call.

I'm having this sudden and strange issue, when my RPC call tries to return the value, this exception is thrown:

java.lang.RuntimeException: Unexpected failure

It happens at this code of the GWT library:

/**

   * Creates a new instance of {@code klass}. The class must have a no-arg

   * constructor. The constructor may have any access modifier (for example,

   * private).

   */

  @SuppressWarnings("unchecked")

  public static <T> T newInstance(Class<T> klass) {

    Constructor<T> c = (Constructor<T>) constructorCache.get(klass);

    try {

      if (c == null) {

        c = klass.getDeclaredConstructor();

        c.setAccessible(true);

        constructorCache.put(klass, c);

      }

      return c.newInstance();

    } catch (Exception ex) {

      throw new RuntimeException("Unexpected failure", ex);

    }

  }

I emptied all and every cache I can think of, I also started using JDK 6 instead of 7, but with no luck yet.

I'm using GWT 2.5.1 and App Engine 1.7.7.1.

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