Another problem concerns dependencies and versions. For instance the well known JQuery UI toolkit is based on JQuery core framework and therefore you need to load the second one in order to use the first one. Moreover, before using a cool third party JQuery widget, you have to make sure it will fit well with the version of JQuery used on your project. You may argue those problems are not currently solved perfectly in Java world either since there are specifications such as Jigsaw which aim to deal with it in Java
8 9. However Java is a static language which significantly reduces those issues at compile time and thanks to Maven POM definitions, we can also solve most of the possible issues at runtime.