Technical Interview ,1 st round Coding , 2nd round Designing, 3rd round HR ,4th Round some questions from first round How Garbage collector works internally What is collision Can two objects have same hashcode From employee list select highest salary How concurrent hashMap internally works Bean scope How you handle exception in Spring Find Duplicate name in arrayList @Transcational Annotation is used for? How you will implement API How you test API JPS? what is difference between singleton in java and singleton in spring Optional Throwable