MyEclipse under Web project libraries

Some LIBRARIES:JRE system Libraries, Java EE 5 libraries,referenced libraries,web App liraries, will appear after a new Java Web project in the CV.

The role of these libraries and the timing of their emergence are:

JRE system Libraries: Some jar files that are required for any Java program to appear automatically after the project is created.

Java EE 5 Libraries: Some jar files that are required for any Java Web program to appear automatically after the project is created.

Referenced Libraries: does not appear after you create the project, it occurs when you add a third-party jar file to the build path.

Web App Liraries: does not appear after the project is created, by adding libraries to the Java build path interface, its value is the jar file in the Webroot/web-info/lib directory, but there is another saying: WEB app Libraries : This container dynamically manages CLASSPATH entries for types in the web-inf/lib and web-inf/classes directories.

about Web projects don't see Web App Libraries

The

can be->built path->configure built Path->java build path page by right-clicking the project, click Libraries Tag   Click add  on the right Library button, select Web app  in the pop-up window, libraries Add. If you do not have a jar file in your Web app libraries after you add it, the Web App libraries will still not appear.