EL表达式报错： According to TLD or attribute directive in tag file, attribute value does not accept any expressions
EL表达式报错： According to TLD or attribute directive in tag file, attribute value does not accept any expressions：
在导入页面时，报如下错误：
严重: Servlet.service() for servlet jsp threw exception
org.apache.jasper.JasperException: /out.jsp(32,10) According to TLD or attribute directive in tag file, attribute value does not accept any expressions
at org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:40)
at org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:407)
at org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:148)
at org.apache.jasper.compiler.Validator$ValidateVisitor.checkXmlAttributes(Validator.java:1186)
at org.apache.jasper.compiler.Validator$ValidateVisitor.visit(Validator.java:840)
at org.apache.jasper.compiler.Node$CustomTag.accept(Node.java:1530)
at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2361)
at org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2411)
at org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2417)
at org.apache.jasper.compiler.Node$Root.accept(Node.java:495)
at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2361)
查看源码是el表达式有引入空值${null} ，所以报错；
更改下引入jstl标签库
由
<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %>
改成
<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core_rt" %>
这样${null},就不会报错，并且打印成空值
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