Scala - reflectively invoke private static method from Java

I'm trying to take a private static method from a Java class and invoke it in Scala. Here's the code I have so far:

val blockClass = classOf[Block]
val aMethod: Method = blockClass.getDeclaredMethod("a", Integer.TYPE, classOf[String], classOf[Block])
aMethod.setAccessible(true)

aMethod.invoke(null, 145, "anvil", anvilPatch)

When I try to compile this, however, I get this error:

Error: the result type of an implicit conversion must be more specific than AnyRef
aMethod.invoke(null, 145, "anvil", null)
                     ^

That 145 is supposed to be a Java int, and Integer.TYPE is the only thing I could think of to get a Java int.

Any ideas?