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Is it because file cannot be opened because it is from an unidentified developer. I have a MacBook Air I have installed TomCat My application will be using servlets I can not get the simplest servlet to compile and execute. I downloaded javax and was not sure where to put it. Thought it should go into Library/Java/Extensions I suspect that Mac will not allow opening the file When is compile in terminal stephenghebert@Stephens-MacBook-Air myapp % javac HelloWorld.java HelloWorld.java:10: error: cannot find symbol public class HelloWorld extends HttpServlet { ^ symbol: class HttpServlet HelloWorld.java:11: error: cannot find symbol public void doGet(HttpServletRequest request,