Arvato Junior E-commerce Java Developer interview questions

It was a ridiculous interview process. I am a new grad in computer science with e-commerce programming backgroud but have limited experience in java. I think this positionis a good fit for me. I submit my resume in several positions such junior java developer and e-commerce java developer at their career page. However it seems that arvato company recruiting system is a black hole and reject all my application in 4 days. Luckily I connect to CEO of arvato systems north america and their recruiters at LinkedIn, a few days later their recruiters send me email asking to set up a interview. During the first phone interview with HR, she questioned my experience of java, I told her although I do not have 3 years java working experience for this entry level position, but I know oop and have an e-commerce background. She said then she will set up a technical interview for me. Around a week later, I got the technical interview with their senior developer and a junior developer. The interview question is not difficult just testing my basic knowledge of java programming. I thought the interview is smooth and successful since the interviewer said the next step is the on-site interview and their HR will connect me in the following days of this week. However, I got a reject letter from their recruiting system without any hr-name for my application a week later. I just want to say, if you do not hire people, why you set up me an interview and waste my time?