There are lots of people here who can explain this. Generally, SVG and JavaScript are both running in a browser on a client. SVG communicates with JavaScript via events. JavaScript updates the DOM, which is the in-memory representation of the SVG. See this link for a working example of JavaScript/SVG interaction: http://www.w3.org/TR/SVG11/script.html#EventHandling The Java Servlets run on a web server that supports servlets (e.g., Tomcat). The client JavaScript that is embedded in the SVG can communicate with a servlet via getURL() and postURL() calls. For example, the client can call getURL(url, callback) to execute the doGet() function in a servlet. In Tomcat, the url is mapped to the servlet via the web.xml file. The doGet() function on the server returns a result to the client, which causes the callback function on the client to be called. The callback function parses the results and updates the DOM, causing the display to be updated. getURL() and postURL() are supported by the Adobe SVG and Batik viewers, but not all viewers. I don't know of a link that explains in detail with examples the servlet-JavaScript interaction (maybe someone else can provide this). If you know how to do servlets on your web server, then getting them to work with client JavaScript and SVG isn't difficult.
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