Cannot be resolved in either web. xml or the jar files deployed with this application, resolveddeployed

Cannot be resolved in either web. xml or the jar files deployed with this application, resolveddeployed

An error is reported when C segments in the original project are sent to the new project. 
: Org. apache. jasper. jasperException:/register. jsp (line: 10, column: 1) The absolute uri: http://java.sun.com/jsp/jstl/core cannot be resolved in either web. xml or the jar files deployed with this application

Try a solution 
1. Reference a method for testing.

It may be a JSTL version error. Because JSTL1.0 and JSTL1.1 have different declaration statements.
JSTL 1.0 declaration is:
<% @ Taglib prefix = "c" uri = "http://java.sun.com/jstl/core" %>
JSTL 1.1 declaration is:
<% @ Taglib prefix = "c" uri = http://java.sun.com/jsp/jstl/core %>
If the JSTL library you are using is inconsistent with your declaration in JSP. The Exception mentioned above will be reported.
In addition, it should be noted that Tomcat is to first reference the library under "TOMCAT_HOME/shared/lib", and then reference the "WEB-INF/lib" library under the web Project.
In addition, the JSTL library in jBuilder has two configurations: "JSTL" (1.0) and "JSTL1.1" (1.1 ), note: Do not reference the error during project creation.
Another trick is: how to determine the version of two JSTL library files (standar. jar and jstl. jar?
Expand the MANIFEST. MF file of the jar file under the META-INF directory, where "Specification-Version" indicates the Version number.

Operation 
Open MANIFEST. MF, only

1 Manifest-Version: 1.02 Class-Path: 

 

 

The code is http://java.sun.com/jsp/jstl/core, and may be 1.1.
Change it to http://java.sun.com/jstl/corefor post-testing, and the question remains.

2. There may be no package for lib under web-inf. Place jstl. jar and standard. jar under lib. 
Test: Put the two packages into the package.
Note: If the servlet version does not match the jar version of The jstl tag library, an error is returned.
According to TLD or attribute directive in tag file, attribute value does not ac

Version	JSTL version	Requirements
Standard 1, 1.2	JSTL 1.2 (not yet JCP approved)	Servlet 2.5, assumerver Pages 2.1
Standard 1, 1.1	JSTL 1.1	Servlet 2.4, assumerver Pages 2.0
Standard 1, 1.0	JSTL 1.0	Servlet 2.3, assumerver Pages 1.2

Pay attention to the table above.