The web application we develop uses three Java Applets.
We know that Chrome 45 will drop NPAPI support. In this page, Oracle says that Java Plugin relies on NPAPI.
https://java.com/en/download/faq/chrome.xml
The fact is that I've tried to execute my Applets with chrome 43 and 44, which disable NPAPI by default but not the Java Plugin and they execute correctly, although some extra warning messages appear on the top of the window saying that the Java Plugin will be disabled soon.
Question 1: If Java Plugin relies on NPAPI, why are my applets working? I don't undertand it.
Question 2: Is the Java Plugin for Chrome going to be unsupported in Chrome 45 and, are my Applets going to work in Chrome 45?
1) Most likely either you re-enabled NPAPI support yourself, or you are in a managed environment that re-enabled NPAPI support for you. You can check chrome://flags to see if it's enabled.
2) No, your applets won't work in Chrome once NPAPI support is completely removed (that's why the infobar you describe is there).