There are a few ways (and reports) you can look at measuring the popularity of programming languages. One of the most common and widely used reports is the PYPL PopularitY of Programming Language Index, which is based on Google search trends on language tutorials.
Another popular ranking system is TIOBE, which aggregates search engine queries (Google, Yahoo, Bing, Wikipedia, Amazon, and Baidu) and the number of worldwide engineers devoted to each particular language.
By analyzing Indeed’s job trends, the growth/decline of Java shows a different story. Though a yearly decline from 2012-2015 is fairly evident, the graph still shows the popularity of Java-related jobs over others. The blue line representing Java is still multiples above the relatively stagnant dynamic languages.