To work with Java Explorer you need to have a Java Development Kit 7, 8, downloadable from the Java SE Downloads page, or a IBM Java Development Kit installed on your system.
If you are using Microsoft Windows Vista or Microsoft Windows 7 as your operating system, you must have administrator priviledges to launch Java Explorer from the Start menu. If you do not have administrator priviledges, Java Explorer is not able to create files or folders or to run Silk Performer.
Some Web Services only work with specific SOAP stacks, depending on the server-side implementation of the Web Service. In this case, use trial and error to find the appropriate SOAP stacks, because the reported error messages are not clear.