The solution for find the better and effective way for creating graphs was answered by the vaadin site itself. There is a Addon for vaadin i.e, JFreeChart wrapper for Vaadin (https://vaadin.com/directory#addon/jfreechart-wrapper-for-vaadin:vaadin)...
jPOS-EE has moved from GoogleCode to Github (https://github.com/jpos/jPOS-EE). I suggest you take a look at the following documents: http://jpos.org/doc/proguide-draft.pdf (as mentioned in http://jpos.org/learn) and http://jpos.org/doc/jPOS-EE.pdf Then grab a jPOS-template (https://github.com/jpos/jPOS-template) and add the clientsimulator and serversimulator as dependencies. Here is a recent article (http://jpos.org/blog/2015/06/replicatedspace-10-years-later/) about doing that process for another...
Well, read jpos library documentation its draft version is available on the web you can find it here Specific to your question about JPOS Server better to implement your own server. JPos provides class ISOServer e.g. following beans initiates a ISO Server in applicationContext.xml file <bean id="paymentServer" class="org.jpos.iso.ISOServer"> <constructor-arg> <value>13000</value>...