Inner class not included in JAR file after running "jar cf"

I have the following files: ``` java_classes/TerrainMesh.class java_classes/TerrainMesh$Vertex.class ``` They were compiled from the following source: ``` class TerrainMesh { static class Vertex { // ... } } } ``` I'm building a JAR file like this: ``` jar cf jar/cities.jar -C java_classes "cities/TerrainMesh.class" -C java_classes "cities/TerrainMesh$Vertex.class" ``` Inspecting the JAR contents with `jar tf jar/cities.jar` gives me: ``` META-INF/ META-INF/MANIFEST.MF cities/TerrainMesh.class ``` As you can see, `TerrainMesh$Vertex.class` is missing from the JAR file. Predictably, when calling methods in `TerrainMesh` that use the inner `Vertex` class, I get `java.lang.NoClassDefFoundError`. I'm pretty sure this is because the inner class is not included in the JAR. How do I get the inner class into the JAR file? It seems really weird that `jar cf` is ignoring it. For what it's worth, I've verified that running `jar tf` on JAR files made by other people does show the inner classes.