- appreciation of backwards-compatibility (here it wins with Python);

- great debuggers and performance tools (e.g. Java Flight Recorder or Eclipse Memory Analyzer);

- easy deployment - you can just give someone a fat JAR (here it wins with all scripting languages, so Python, Ruby, PHP, or any other flavour of the month);

- industry-grade garbage collectors;

- publicly-available standard spec (here it wins with all the defined-by-implementation languages such as Python, PHP, Rust, basically most languages, and with languages which are standardized, but their specs aren't public: C, C++, Ruby);

- kind of like the previous point, but anyway: multiple implementations to choose from;

- I've been told it has good performance. I've never seen a real-world Java application which felt fast, but I've heard people put it at the pedestal and the Debian programming languages benchmarks game seems to corroborate that story;

Besides, the question wasn't about which technologies we like, but which we believe are entrenched so much, they aren't going to go away for a very long time. I don't see Java going away for another 100 years, no matter how much I would or wouldn't like to work with it.