First:
Please look into java-to-rust-converter-for-tedious-editing-tasks for more information.
I accidentally duplicated the post by changing the title.
Second:
I do not understand correctly, did you try to paste some java-code into: converter, and pressed Convert?
The result you can see and copy from the editfield on the right.
The server/program works by using the javaparser-module on github and letting work some Iterators on top on the syntax tree.