Caplet now loads plugins from plugins dir.

src/main/java/CordaCaplet.java

@@ -1,8 +1,44 @@
-// Please do not move me. I need to be in the global namespace :(
+// Due to Capsule being in the default package, which cannot be imported, this caplet
+// must also be in the default package. When using Kotlin there are a whole host of exceptions
+// trying to construct this from Capsule, so it is written in Java.
+
+import java.io.File;
+import java.nio.file.Path;
+import java.util.List;
+import java.util.Map;
 
 public class CordaCaplet extends Capsule {
 
     protected CordaCaplet(Capsule pred) {
         super(pred);
     }
+
+    @Override
+    @SuppressWarnings("unchecked")
+    protected <T> T attribute(Map.Entry<String, T> attr) {
+        if(ATTR_APP_CLASS_PATH == attr) {
+            T cp = super.attribute(attr);
+            List<Path> classpath = (List<Path>) cp;
+            return (T) augmentClasspath(classpath);
+        }
+        return super.attribute(attr);
+    }
+
+    // TODO: If/when capsule fix the globbing issue (See: https://github.com/puniverse/capsule/issues/109)
+    //       then replace this with a simple glob
+    // TODO: Make directory configurable
+    private List<Path> augmentClasspath(List<Path> classpath) {
+        File dir = new File("plugins");
+        if(!dir.exists()) {
+            dir.mkdir();
+        }
+
+        File[] files = dir.listFiles();
+        for (File file : files) {
+            if (file.isFile()) {
+                classpath.add(file.toPath().toAbsolutePath());
+            }
+        }
+        return classpath;
+    }
 }