mutual dependent class not working #65

jjava-kernel/src/main/java/org/dflib/jjava/kernel/execution/CodeEvaluator.java

@@ -114,7 +114,10 @@ protected Object evalSingle(String code) {
                     throw new RuntimeException(e);
                 }
 
-                if (!event.status().isDefined()) {
+                // Undefined snippets are generally bad, unless we can still recover from them. E.g.,
+                // "Unresolved dependencies" errors are recoverable when those dependencies are defined in the later
+                // snippets.
+                if (event.status() != Snippet.Status.RECOVERABLE_NOT_DEFINED && !event.status().isDefined()) {
                     throw new CompilationException(event);
                 }
             }

jjava-kernel/src/main/java/org/dflib/jjava/kernel/execution/JJavaLoaderDelegate.java

@@ -31,9 +31,15 @@ public JJavaLoaderDelegate() {
     @Override
     public void load(ExecutionControl.ClassBytecodes[] cbcs) throws ExecutionControl.ClassInstallException {
         boolean[] installed = new boolean[cbcs.length];
-        int i = 0;
+
+        // Must record all defined classes before attempting to load them. Otherwise, classes depending on other,
+        // not yet loaded classes, may fail (see https://github.com/dflib/jjava/issues/65)
         for (ExecutionControl.ClassBytecodes cbc : cbcs) {
             declaredClasses.put(cbc.name(), cbc.bytecodes());
+        }
+
+        int i = 0;
+        for (ExecutionControl.ClassBytecodes cbc : cbcs) {
             try {
                 Class<?> loaderClass = classLoader.findClass(cbc.name());
                 loadedClasses.put(cbc.name(), loaderClass);