When specified sourcebase for rmic, the generated source files are not moved to the sourcebase directory as expected. For example, /tmp/c will be empty after the following rmic task.

<rmic base="${project.java.classes}" sourcebase="/tmp/c" iiop="true" verify="true" classpathref="compile.classpath"/>

However, it works as expected with Ant 1.7.0 and 1.7.1. 

After looking at the Ant 1.8.0 source, it appears sourceFileName didn't get the suffix '.java' appended:

707     String sourceFileName = StringUtils.removeSuffix(generatedFile,
708                                                      ".class");
709 
710     File oldFile = new File(baseDir, sourceFileName);

And in the Ant 1.7.0 source, '.java' is appended to the sourceFileName at line 599 as following:

598    final int pos = generatedFile.length() - ".class".length();
599    String sourceFileName =
600          generatedFile.substring(0, pos) + ".java";
601 
602    File oldFile = new File(baseDir, sourceFileName);