Excuse my English is a translation I would like to know how to load and use external free services in basic4java, I need to be able to read and write pdf files, such as reading, writing excel files. I have seen that the internal libraries have an xml and appear in the library explorer but when I want to load an external library does not appear and I indicated in the path of the basic4java the external libraries folder, please if someone is kind enough to help me I am new In this environment. thank you very much