jodd-core/src/main/java/jodd/io/FileUtil.java
private static File checkCreateDirectory(final File dir) throws IOException {
		if (!dir.mkdirs()) {
			throw new IOException(MSG_CANT_CREATE + dir);
		}
		return dir;
	}
private static File checkCreateDirectory(final File dir) throws IOException {
		if (!dir.mkdirs()) {
			throw new IOException(MSG_CANT_CREATE + dir);
		}
		return dir;
	}
Checks if directory can be created. Throws IOException if it cannot.
<p>
This actually creates directory (and its ancestors) (as per {@link File#mkdirs()} }).

@param dir Directory
@throws IOException if directory cannot be created.