VMware interview questions

Kanban, why we use if support team came and ask that in prod databases are not getting connected, what will be your fix? Double queue operating principal design patterns singleton/prototype pattern what is the negative of singleton does siblgleton create different instances for diff JVMs? how to restrict that drawback in singleton why we use data structures print vs println set vs tree set http methods, patch vs put "print below matrix: 1 2 3 4 5 16 17 18 19 6 15 24 25 20 7 14 23 22 21 8 13 12 11 10 9 " sevice vs repository 2nd round : Service layer prototype bt controller is singleton is it possible?? what App server we are using? Security schemes for the project What encryption we use how to give rolebase access to an application Dom parser vs xml parser SOAP vs Rest Search engine used in project Why we need connection pool connected always singleton pattern an prod application giving OUT OF MEMORY error. How to resolve?? Shopping cart system design Workflow after add cart from developers perspective What too we use for prod deployment web server vs app server finalize method how you use load balancer in your project how to approach SLA tasks caching for performance aspect why we need normalization load profile for performance testing transaction for performance testing