Depressed, I'm so impetuous

I used to read petstore2.0 and used javaee5 and Sun appserver9.0 for a while. Recently, it was mastering ejb3, and I went crazy for a few days. Although ejb3 is much simpler than the previous version, it also reduces the difficulty of learning, but it is still "Smelly". Maybe this mastering ejb3 is too flashy, and the style of the three authors is very different. In addition, I am not good at E, it was really painful. I had forgotten about struts, hibernate, spring, Ruby, and Ajax before. I thought about ejb3 which I was learning now and felt too impetuous, although the technology is developing fast, learning all kinds of languages and technologies is not fashionable, or "excellent in specialization". I hope to make more corrections ...........