Hello, It is a little odd to me that I find OpenJDK JarURLConnection does not support bmp file. The testcase below:
public static void main(String[] args) throws MalformedURLException, IOException { JarURLConnection conn = (JarURLConnection) new URL("jar:file:/somedir/somejar.jar!/somebmp.bmp").openConnection(); System.out.printf("Returned type for the entry should be the known type " + "image/bmp, but it is " + conn.getContentType()); } (Need create a somejar.jar containing a bmp file named somebmp.bmp) It should return image/bmp but it does not. I see we may add image/bmp support in the windows\lib\content-types.properties to make the testcase pass. However I am not sure if OpenJDK do want to support it, or there is some reason why OpenJDK don't? -- Best Regards, Jimmy, Jing LV