Eclipse---->error and exception and common configurations

1, Eclipse Open error: An internal error occurred during: "Initializing Java tooling". java.lang.NullPointerException

Solution:Window-->perspective-->reset Perspective ...

2, if the project needs to introduce a class or interface with the same name of the annotation, you need to first comment out or delete the class or interface, otherwise you cannot introduce the fully qualified name of the import annotations.

3, MyEclipse Modify the published Web project name:

Fix:window-->properties--> Search Web keyword -- Check web-- switch to the context root tab --In the web Modify the name of the project to be published at Context-root

4, upgrade eclipse, the best way is to download the latest version directly to the official website . Online updates are not recommended because the efficiency is really low.

5. Eclipse modifies the published project name:

FIX: Project name right-click--Select Properties -- Search Web --Select Web project Settings -Modify context Root, write the name of the project

Eclipse---->error and exception and common configurations