NoClassDefFoundError running method in war file caused by InvokedynamicClassLoader?

I'm working on a java 8 backend providing a rest api that is built with its dependency (another project required for the first projects execution - let us call it Project B) in a war file which is deployed on a tomcat 8. This Project B uses the invokedynamic package that can be found here.

The execution of multiple methods throws an NoClassDefFoundError. A excerpt of the stack trace looks like this:

java.lang.NoClassDefFoundError: es/uniovi/reflection/invokedynamic/interfaces/Callable
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:642)
    at es.uniovi.reflection.invokedynamic.codegen.InvokedynamicClassLoader.register(InvokedynamicClassLoader.java:36)
    at es.uniovi.reflection.invokedynamic.codegen.ClassGenerator.getInstance(ClassGenerator.java:107)
    at es.uniovi.reflection.invokedynamic.MemberBSClass.getInstance(MemberBSClass.java:83)
    at es.uniovi.reflection.invokedynamic.MemberBSClass.getCallable(MemberBSClass.java:44)
    at es.uniovi.reflection.invokedynamic.ProxyFactory.getInvokedynamicCallable(ProxyFactory.java:773)
    at es.uniovi.reflection.invokedynamic.ProxyFactory.generateInvokeDynamicCallable(ProxyFactory.java:91)

The error causing class can be found here.

It is important to know that another project, using this Project B as a dependency too, runs locally without any trouble (not a web application and contains a simple main call). That is the reason why i think that the deployment or execution does not work properly or missed something but i couldn't figure out the actual problem.

My war file contains the "missing" class:

WEB-INF/classes/es/uniovi/reflection/invokedynamic/interfaces/Callable.class

Its overall structure of this file looks like the following:

- error
    - some error files
- META-INF
    - MANIFEST.MF
- WEB-INF
    - classes
         - de. ... -> the backend project
         - es / uniovi ... -> dependency of Project B
         - net. ... -> the dependent project
    - lib
    - spring
    - web-dev.xml
    - web.xml

Is it possible that the InvokedynamicClassLoader causes the problem and is not executable running inside a tomcat? The method is called in this way:

Class<T> c = (Class<T>) InvokedynamicClassLoader.getClassLoader().register(className, code);

where className outputs something like

es/uniovi/reflection/invokedynamic/Callable1

Thanks for any suggestion due to the fact that i'm pretty new to java.