NullPointerException

Kangmo is a software developer. He develops business models, analyzes competitors, develops products in Nanolat. He started his professional career in 1998. He worked in software industry for 13 years. He worked at Microsoft China for 2.5 years, developed in-memory database engines for five years, developed low latency stock exchange in Korea Exchange for two years. He learned six languages in his whole life. They are English, Korean, C, C++, Java, and Scala.