At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for 。。。

At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during
scanning can improve startup time and JSP compilation time.

1.检查jsp版本

如果是2.3版本,则xml指令和文档类型定义如下:（不支持EL表达式）

<?xml version="1.0" encoding="ISO-8859-1"?>

<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"

"http://java.sun.com/dtd/web-app_2_3.dtd">

如果是2.4版本,则为:（开始支持）

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns="http://java.sun.com/xml/ns/j2ee"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.4"

xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee

http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

2.web.xml中,是否停用了jsp表达式语言

<jsp-config>

<jsp-property-group>

<url-pattern>/legacy/*.jsp</url-pattern>

<el-ignored>true</el-ignored>

</jsp-property-group>

</jsp-config>

这种情况的解决方法就是把<el-ignored>true</el-ignored>改为<el-ignored>false</el-ignored>

3.在版本正确的前提下，有三种解决方案可供参考：

第一种：严格遵守java规范，修改对象的属性名称，要求不包含java关键字;

第二种：修改EL表达式，例如"${owner.new}"可以修改为"${owner['new']}";

第三种：修改tomcat属性，忽略对EL表达式的关键字检查。修改$CATALINA_BASE/conf/catalina.properties文件，添加org.apache.el.parser.SKIP_IDENTIFIER_CHECK=true选项。