ODA File Converter
For converting between different versions of .dwg and .dxf
ODA Online File Converter is a sample web application that demonstrates using the Java version of the Drawings SDK to access and manipulate .dwg file data and convert that data to a .pdf file. You can convert a file online directly, and you can also download the complete sample code and then build and run the application. Java developers are able to use all of the capabilities of the powerful ODA platform.