Database Polling and Scheduling in Springboot

I need to perform Polling operation on one of the DB table(say T1) and update status on another DB table(say T2). This Job has to be scheduled whenever there is an insertion in the Table T2.

I am aware of Quartz scheduler but that gives time based scheduling and polling.
Are there any other libraries which would be handy for such cases?

In principle there are two approaches to your problem:

1. Get an immediate notification when a change occurs:
   This means that either the database tells you about the change (via a DB trigger) or the application that makes the change tells you about it.
   You said that triggers are not an option, since the DB is not under your control. You also said that the change originates in our application. So a possible solution could be to have the code that makes the change notify other modules about the change. One possibility could be to allow registering a callback / handler method. This pattern is very common, for example when you register an onClick handler on a UI button. You are saying "whenever this happens, call me" (see for example https://docs.oracle.com/javase/7/docs/api/javax/swing/AbstractButton.html#setAction(javax.swing.Action)).

2. Poll for the change:
   This method is less effective / more resource intensive but can be applied when option 1) is not possible (DB trigger not possible, changes happen through another (part of the) application you do not control). You simply keep looking for the change in regular intervals. You can use Quartz for this or also the built in classes like java.util.TimerTask / java.util.concurrent.ScheduledExecutorService.