Very subjective reasons from one or two decades ago - possibly outdated now: * lack of user-friendly UIs in the end product * super frustrating *NullPointe

Very subjective reasons from one or two decades ago - possibly outdated now: * lack of user-friendly UIs in the end product * super frustrating *NullPointerException* showed to confused users in (almost) all java programs they get close to - despite java enthusiasts assuring that good programs should not feature that. * annoying frequent update popup shown to end users, with bloated process pushing to install other unrelated stuff * creating a super tiny dependency program in java results in a hundreds-megabytes distributable because (??) * heavy and bloated IDEs * confusing JRE / JDK required installs * licensing confusion once Oracle made Oracle Java SE paid * supposed to be multi-platform but tricky to make it work well on some versions of linux (painful memories using pentaho or gephi, finding the right file where to set-Xms<memory> -Xmx<memory> flags after a crash)