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。