How to troubleshoot issues with com.cimmetry.vuebean.VueBean.setFile()?

In AutoVue 21.0.0, com.cimmetry.vuebean.VueBean.setFile() is returning false, regardless of the protocol (upload:// or http://) I use.  The servlet container is listening on port 5098 and the JVueServer is sitting on port 5099, and the JVue applet is successfully displaying files in this configuration.  I have tried multiple combinations of the properties above the call to setDocID() in the code snippet below to no avail.  Without that method throwing an error instead of a boolean, it’s been difficult to troubleshoot.  How do you folks go about this?

            DocID docID = new DocID(filename);

//            docID.setDocName(lhText);

//            docID.setDisplayName(lhText);

//            docID.setMarkupFile(false);