Java and Tcl do actually work together, and can be combined in interesting and useful ways. To get a more complete list of references, go to the Category Java page, click on the title, and you'll get a list of pages that refer to the Java Category.
The most notable combinations of Tcl and Java are described as part of the TclJava project.
If you want see contrasts and comparisons between Java and Tcl, then you might want to look at Java vs Tcl or just the Java page.
Category Java - Tcl and other languages - Arts and crafts of Tcl-Tk programming