When I do Java work I always use Apache Maven. It's a clear step forward in Java world compared old Apache Ant - which is as terrible as old makefiles from C/C++ if the project grows. Although project descriptions (POM) in Maven are also static due to XML (and one has to code a Mojo with Java for non-common tasks) I like the unified way to treat projects and builds and the amount of plugins that are available (ranging from checkstyle, site plugins, project reports, ...).
Nice to hear that Redline Smalltalk JAR is now accessible in a Maven repo too - at least a snapshot (https://oss.sonatype.org/content/repositories/snapshots/st/redline/redline/0.2-SNAPSHOT/). Will make it easier to use it and follow Redlines development if new versions will show up as maven artefacts.
If time permits I will play with Redline a little bit in the next evenings since according to the latest commits one can now use a Java class like a Smalltalk class within Redline. This is done by dynamically generated Smalltalk to adopt a Java class. Here is an example for java.util.ArrayList.