code: public CreateNotebookInstanceLifecycleConfigRequest withOnStart(NotebookInstanceLifecycleHook... onStart) {
          if (this.onStart == null) {
              setOnStart(new java.util.ArrayList<NotebookInstanceLifecycleHook>(onStart.length));
          }
          for (NotebookInstanceLifecycleHook ele : onStart) {
              this.onStart.add(ele);
          }
          return this;
      }
docs: <p>
  A shell script that runs every time you start a notebook instance, including when you create the notebook
  instance. The shell script must be a base64-encoded string.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setOnStart(java.util.Collection)} or {@link #withOnStart(java.util.Collection)} if you want to override
  the existing values.
  </p>
  
  @param onStart
  A shell script that runs every time you start a notebook instance, including when you create the notebook
  instance. The shell script must be a base64-encoded string.
  @return Returns a reference to this object so that method calls can be chained together.