samuelwillyanto1 opened a new issue, #8328:
URL: https://github.com/apache/hop/issues/8328
### Apache Hop version?
2.19.0
### Java version?
21
### Operating system
Windows
### What happened?
In the workflow action **Get mails (POP3/IMAP)**, when configured with the
**IMAP** protocol, changing the **Retrieve** option in the **Settings** tab
(for example, selecting **"Get unread messages"**) fails to persist across
sessions. After saving, closing the workflow tab, and reopening it, the setting
reverts to **"Get all messages"**.
As a direct consequence, running the workflow retrieves all messages instead
of filtering only unread ones. Additionally, attempting to deserialize or
inspect the generated XML in previous Hop versions results in a
`NumberFormatException: For input string: "ignore"`.
---
### Step-by-Step Guide to Reproduce
Follow these exact steps from a clean session:
#### Step 1: Create a New Workflow
1. Launch Hop GUI.
2. In the file navigation or menu bar, click **File** -> **New** ->
**Workflow**.
#### Step 2: Add Required Actions
1. From the actions palette on the left, drag and drop the **Start** action
onto the workflow canvas.
2. Drag and drop the **Get mails (POP3/IMAP)** action onto the workflow
canvas.
3. Hover over **Start**, click and drag the connecting hop line to **Get
mails (POP3/IMAP)** to establish an unconditional connection.
#### Step 3: Configure IMAP Protocol
1. Double-click the **Get mails (POP3/IMAP)** action icon to open its
configuration dialog.
2. On the **General** tab:
* Keep the default action name or set any name (e.g., `Get mails
(POP3/IMAP)`).
* In the **Protocol** dropdown, select **IMAP**.
#### Step 4: Configure Retrieve Setting
1. Switch to the **Settings** tab at the top of the dialog.
2. Under the **IMAP settings** section:
* Locate the **Retrieve** dropdown field.
* Change its value from the default `Get all messages` to **`Get unread
messages`**.
* Leave all other optional fields (such as server credentials or folders)
as needed for reproduction.
#### Step 5: Save and Close Workflow
1. Click **OK** at the bottom of the dialog to apply the changes.
2. Save the workflow via **File** -> **Save** (or press `Ctrl + S`), naming
it `test_get_mail_issue.hwf`.
3. Close the active workflow tab by clicking the **x** on the editor tab
title.
#### Step 6: Reopen and Verify the Regression
1. Open the saved file `test_get_mail_issue.hwf` via **File** -> **Open**.
2. Double-click the **Get mails (POP3/IMAP)** action to open the dialog.
3. Switch to the **Settings** tab and inspect the **Retrieve** dropdown
under **IMAP settings**.
---
### Expected Behavior vs. Actual Behavior
| Criteria | Expected Behavior | Actual Behavior |
| :--- | :--- | :--- |
| **Persisted Setting** | The **Retrieve** dropdown remains **`Get unread
messages`**. | The dropdown reverts back to **`Get all messages`**. |
| **Pipeline/Workflow Execution** | The step connects to the IMAP server and
only processes messages marked unread. | The step pulls **all messages** from
the inbox, ignoring the unread filter. |
| **Backward Compatibility / XML Parsing** | Valid XML structure for
serialization and deserialization. | Fails with `NumberFormatException: For
input string: "ignore"` when parsed or loaded across certain versions. |
---
### Stack Trace / Error Log (Backward Compatibility Failure)
When a workflow containing the **Get mails (POP3/IMAP)** action configured
with **IMAP** and **Retrieve: Get unread messages** is created and saved in
**Apache Hop 2.13.0** (where it persists and reopens normally), attempting to
open this same workflow file in **Apache Hop 2.19.0** completely fails to load
with the following error dialog and stack trace:
```text
Unable to load workflow info from XML node
Unable to instantiate a new instance of class
org.apache.hop.workflow.action.ActionMeta: make sure there is an empty public
constructor available to allow XML de-serialization
For input string: "ignore"
Root cause: NumberFormatException: For input string: "ignore"
```
---
### Visual Evidence
* **Screenshot A (Configuration):** Shows IMAP settings with `Retrieve` set
to `Get unread messages`.
<img width="712" height="747" alt="Image"
src="https://github.com/user-attachments/assets/5627e327-c215-4145-8af4-07ee1369da72";
/>
* **Screenshot B (Post-Reopen):** Shows IMAP settings automatically reverted
to `Get all messages` after reloading the workflow file.
<img width="700" height="745" alt="Image"
src="https://github.com/user-attachments/assets/41a9da51-5910-4424-a167-2d7d8ec4a630";
/>
### Issue Priority
Priority: 1
### Issue Component
Component: Workflows, Component: Actions
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