This method simulates the loading of a class by the JVM, during which
        parts of the class (e.g. static fields) are initialized. For this, we
        run the class initializer method <clinit> (if available) and update
        the state accordingly.

        Note: Initialization is skipped, if the class has already been
              initialized (or if it's not loaded in CLE).

def init_class(self, class_, step_func=None):
        """
        This method simulates the loading of a class by the JVM, during which
        parts of the class (e.g. static fields) are initialized. For this, we
        run the class initializer method <clinit> (if available) and update
        the state accordingly.

        Note: Initialization is skipped, if the class has already been
              initialized (or if it's not loaded in CLE).
        """
        if self.is_class_initialized(class_):
            l.debug("Class %r already initialized.", class_)
            return

        l.debug("Initialize class %r.", class_)
        self.initialized_classes.add(class_)

        if not class_.is_loaded:
            l.warning("Class %r is not loaded in CLE. Skip initializiation.", class_)
            return

        clinit_method = resolve_method(self.state, '<clinit>', class_.name,
                                       include_superclasses=False, init_class=False)
        if clinit_method.is_loaded:
            javavm_simos = self.state.project.simos
            clinit_state = javavm_simos.state_call(addr=SootAddressDescriptor(clinit_method, 0, 0),
                                                   base_state=self.state,
                                                   ret_addr=SootAddressTerminator())
            simgr = self.state.project.factory.simgr(clinit_state)
            l.info(">"*15 + " Run class initializer %r ... " + ">"*15, clinit_method)
            simgr.run(step_func=step_func)
            l.debug("<"*15 + " Run class initializer %r ... done " + "<"*15, clinit_method)
            # The only thing that can be updated during initialization are
            # static or rather global information, which are either stored on
            # the heap or in the vm_static_table
            self.state.memory.vm_static_table = simgr.deadended[-1].memory.vm_static_table.copy()
            self.state.memory.heap = simgr.deadended[-1].memory.heap.copy()
        else:
            l.debug("Class initializer <clinit> is not loaded in CLE. Skip initializiation.")