Eclipse breaks on update

After updating Eclipse, it fails to start afterwards.
This is the [error message](https://imgur.com/W18be3K) that is displayed when launching Eclipse.
Here's [the log](https://gist.github.com/bullfroggie/1882f936e53f20245e8de7c23388550e) that is mentioned in the error message.

**OS**: Pop!_OS 20.04

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After looking in the closed issues, I've found that the issue with starting Eclipse after update is resolved with launching Eclipse with command `flatpak run org.eclipse.Java -clean`.

The only issue that persists is that extensions (ie. CDT) need to be reinstalled.

先查看連結的錯誤訊息和日誌，然後在使用 Eclipse 的 Pop!_OS 20.04 上重現更新失敗。檢查回報的因應措施 `flatpak run org.eclipse.Java -clean`，並調查為何仍需要重新安裝 CDT 和其他擴充功能。更新後 Eclipse 能夠啟動且不遺失擴充功能，即表示完成。

由索引模型根據 Issue 內容生成。