What would be the reasons why some jpg images would load in an app while some others would not?

I made an app in jsp pages. The images path is stored in web.xml.

Most of the product images are loading perfectly fine except for some little troublemakers that won't do their job. What could be the reasons why? Any idea?

The extensions

I have checked the extension files which is jpg for everybody...

The images name

I have triple checked all the pictures name to make sure everything matches but it seems that it's the same pictures that wont load over and over again.

The path

The path is same for all images: <img class="img" alt="" src="${initParam.productImagePath}${product.name}.jpg" />