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then a user could edit the spring XML files a.xml or b.xml; or edit the Cheese.java class and have the bundle auto-reloaded.

Even cooler could be to support 'source layout' mode - where code could be taken from a source of a Maven project. e.g.

pom.xml
  src/
    main/
      resources/
        META-INF/
          spring/
            a.xml
            b.xml
      java/
        com/
          foo/
            Cheese.java
target/
  classes/
    com/
      foo/
        Cheese.class

And it auto-detected changes in the XML files too. Though I guess your IDE should be generating the target/classes directory I guess