Oracle NoSQL through Servlet.

Question

Hello Everyone,
I am trying to execute the nosql operations on server through servlet. I want to make an client server application but dont know why the CONNECTION TO KVSTORE IS NOT ESTABLISHED WHILE EXECUTING ON SERVLET.
So is there any separate configuration needed to do so?
Thanks In Advance.

Answer 1

Could you be more explicit please?  What is the exact error you are seeing?
Please explain in detail what is the issue you're facing.
If you want to access an Oracle NoSQL Database KVStore through a servlet the best way would be to use a ServletContextListener in your web app that gets the KVStore handle and places it in application/context scope as an attribute (so that all servlets and JSPs would have access to it) and also closes the handle when the web app gets shut down.  You could even supply the store name, store host name and store host port (the helper host port -- hostName:hostPort) through the web.xml web app config file.
Here is a simple example of such a ServletContextListener:
import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.annotation.WebListener;
import oracle.kv.KVStore;
import oracle.kv.KVStoreConfig;
import oracle.kv.KVStoreFactory;
* KVStoreClientContextListener implements ServletContextListener, hence it will be
* invoked when the application context is initialized and destroyed.
* @author Andrei Costache
@WebListener
public class KVStoreClientContextListener implements ServletContextListener {
    @Override
    public void contextInitialized(ServletContextEvent sce) {
        ServletContext sc = sce.getServletContext();
        KVStore ondbstore = null;
        try {
            // Try to get the store name, store host name and store host port from web.xml,  as context attributes.
            // If they are not available, then default to the values specific to a default KVLite instance.
            String storeName = (String) sc.getAttribute("storeName");
            String hostName = (String) sc.getAttribute("hostName");
            String hostPort = (String) sc.getAttribute("hostPort");
            if (storeName == null) {
                storeName = "kvstore";
            if (hostName == null) {
                hostName = "localhost";
            if (hostPort == null) {
                hostPort = "5000";
            // Get the KVStore and place it as an atribute in application/context scope.
            ondbstore = KVStoreFactory.getStore(new KVStoreConfig(storeName, hostName + ":" + hostPort));
            sc.setAttribute("ondbstore", ondbstore);
        } catch (Exception e) {
            sc.log("Could not get a KVStore instance");
    @Override
    public void contextDestroyed(ServletContextEvent sce) {
        KVStore ondbstore = null;
        ServletContext sc = sce.getServletContext();
        try {
            ondbstore = (KVStore) sc.getAttribute("ondbstore");
            if(ondbstore != null) {
                ondbstore.close();
        } catch (Exception e) {
            sc.log("Could not successfully close the KVStore handles");
In your servlets or JSPs you will simply retrieve the KVStore handle from the servlet context, where it is found as a context scope attribute:
KVStore ondbstore = (KVStore) getServletContext().getAttribute("ondbstore");
and do whatever operations you want using the KVStore handle.
You will need the NoSQL Database kvclient.jar -- either your web container / application server can load it, or you could copy it under the WEB-INF/lib directory so that it gets loaded when your web app gets deployed and started.  (kvclient.jar is found under kv-M.N.P/lib).
Regards,
Andrei