Level Order Tree Traversal of C4.5 (J48) Tree

Dear Weka developers,

I am trying to perform Level Order Tree Traversal of the J48 Tree
based on the following post, which describes Level Order Tree
Traversal of a non-binary tree:

https://www.geeksforgeeks.org/generic-tree-level-order-traversal/

I have added the following method to ClassifierTree.java:

private void dumpTreeLevelOrder(Instances root, StringBuffer text){

    if (root==null)
      return;

    Queue<Instances> q =new LinkedList<>();
    q.add(root);

    while(!q.isEmpty()){
      int n = q.size();
      while (n>0){
        Instances p = q.peek();
        q.remove();
        text.append(m_localModel.leftSide(p));
        text.append(m_localModel.rightSide(1, p)+" ");
        for (int i=0; i<m_sons.length; i++)
          q.add(m_sons[i].m_train);
        n--;
      }
      text.append("\n");
    }
  }

And I call the code from the toString() method with the following command:

dumpTreeLevelOrder(m_train, text);

I get an OutOfMemoryError Exception!

Could anyone please help on how the code should be appropriately changed?

Thank you in advance,

Spyros Halkidis
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