While debuging I see that

httpUpgradeHandlerClass in upgrade of org.apache.catalina.connector.Request
is
class org.apache.tomcat.websocket.server.WsHttpUpgradeHandler

InstanceManager is org.apache.catalina.core.DefaultInstanceManager

in the source code of my maven dependency of tomcat-api-7.0.47 this method
should exist:

public interface InstanceManager {

    public Object newInstance(Class<?> clazz)
            throws IllegalAccessException, InvocationTargetException,
NamingException,
                InstantiationException;
...

Any clue ?

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