Java Script Test based on Thrift Java Library You need libthrift*.jar and libthrift*test.jar located at ${thrift.java.dir}/build/libs Did you compile Thrift Java library and its test suite by "ant compile-test"? Thrift compiler is missing ! check if Xvfb is available: check if phantomjs is available: Running Unit Tests with headless browser! check if gjslint is available: