BLACKG.CHEN

I use it SpringPluginManager, It seems to be a single case.

4

```java SpringPluginManager pluginManager = new SpringPluginManager(new File("plugins").toPath()); DemoImpl implA = pluginManager.getExtension(DemoImpl.class,"xxxx").get(0); implA.setMessage("hello"); DemoImpl impB = pluginManager.getExtension(DemoImpl.class,"xxxx").get(0); String message = implB.getMessage(); // I want an unassigned message ``` `SpringExtensionFactory ` is...