jstl与jsp的版本问题：root cause java.lang.NoClassDefFoundError: javax/el/ELException

最新推荐文章于 2024-04-04 13:46:00 发布

翻译最新推荐文章于 2024-04-04 13:46:00 发布 · 5.6k 阅读

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#jsp #servlet #tomcat #java #library #c

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本文介绍了不同版本的JSTL（JavaServer Pages Standard Tag Library）与Tomcat服务器之间的兼容性问题。JSTL1.2适用于支持JSP 2.1规范的Tomcat6及以上版本，而JSTL1.1则适用于支持JSP 2.0规范的Tomcat5。文章还提供了如何在不同版本的Tomcat中正确配置JSTL的方法。

JSTL1.2

The JSTL 1.2 Maintenace Release aligns with the Unified Expression Language (EL) that is being delivered as part of the JavaServer Pages (JSP) 2.1 specification。JSTL 1.2 is part of the Java EE 5 platform. （from http://java.sun.com/products/jsp/jstl/）

JSTL1.1

Jakarta Taglibs hosts the Standard Taglib 1.1, an implementation of the JSP Standard Tag Library (JSTL), version 1.1, which was developed under the Java Community Process.
NOTE: Standard-1.1 (JSTL 1.1) requires a JSP container that supports the Java Servlet 2.4 and JavaServer Pages 2.0 specifications. Jakarta Tomcat 5 supports the new specifications. The Standard-1.1 taglib has been tested with Tomcat 5.0.3.

JSTL1.0
Standard-1.0 (implementation of the JSTL 1.0 specification) requires a JSP container that supports the Java Servlet 2.3 and JavaServer Pages 1.2 specifications. Jakarta Tomcat 4 supports these specifications. The Standard 1.0 taglib has been tested with Tomcat 4.1.24. (from http://jakarta.apache.org/taglibs/doc/standard-doc/intro.html)

Tomcat6 实现了servlet 2.5 和JSP2.1的规范，可以支持JSTL1.2；

而Tomcat5实现了 servlet 2.4 和JSP2.0的规范，只能支持JSTL1.1

所以，只要使用JSTL1.1(standard-1.1.jar和jstl-1.1.jar)替换JSTL1.2（jstl-1.2.jar）即可在Tomcat5下正常运行！

另外，web.xml必须指定使用servlet 2.4 和JSP2.0的规范：
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">