Ask for help, Young developer request

Good Morning,

I have problem with use of java LibreOffice Api 4.3

Is a possible way to close XComponent (xlsx type) in save way?.

I have converting to pdf method. I use XStorable.storeToURL() The 
converting works fine, but when I try to close like this:

        if (xStorable != null) {
            XCloseable closeable = 
UnoRuntime.queryInterface(XCloseable.class, xStorable);
            if (closeable != null) {
                try {
                    closeable.close(true);
                } catch (CloseVetoException closeVetoException) {
                    //problem with xlsx files, always occure
                }
            } else {
                XComponent xComp = 
UnoRuntime.queryInterface(XComponent.class, xStorable);
                xComp.dispose();
            }
        }

I tried to dispose a XController and the XFrame. In that case window is 
closed, but in next time XComponentLoader cannot load the XComponent, 
problem with socket etc.

Can You tell me what i should do to make it work fine?. Maybe i should 
know more about something or You had some simillar problems?.

I hope You will find time to answer,
Have a nice day.