为何Mule默认用Persistent Store，但Object Store连接器Persistent复选框默认未启用？

Great question! The confusion here stems from a key distinction between Mule's core Object Store functionality and the separate Object Store Connector you're working with—let me break this down clearly:

• Core Object Store vs. Object Store Connector:
  The official documentation refers to Mule's built-in core Object Store (used in components like Cache Scope, or via the <object-store> XML element). Starting in Mule 3.5.0, this core store defaults to persistent. However, the Object Store Connector is a dedicated, standalone component built for advanced use cases (like connecting to external storage backends or granular configuration control), and it has its own intentional default settings.

• The Connector's Default Design Rationale:
  The connector defaults to persistent=false (unchecked) for practical reasons:

  • It forces explicit configuration: Making users manually enable persistence ensures they intentionally opt into disk-based storage, avoiding unintended disk usage (especially useful in development environments where temporary in-memory storage is often sufficient).
  • It prioritizes flexibility: The connector supports multiple storage backends (not just the default file-system store), so starting with an in-memory default gives users a clean slate to configure exactly what they need.

• How to Align with Core Persistent Behavior:
  If you want the connector to match the core persistent Object Store behavior described in the docs, just check the Persistent checkbox in the connector configuration. Mule will then create the default file-system persistent store in the $MULE_HOME/.mule/objectStores directory, exactly as outlined.

Quick verification tip: If you use the core <object-store> element without an explicit persistent attribute, it will default to true (persistent) as the docs state—this is separate from the connector's default setting.

内容的提问来源于stack exchange，提问作者Arun Raja