自定义标签异常错误汇总

1、未设置 empty 属性

• 错误信息：

  严重: Servlet.service() for servlet [jsp] in context with path [/web-exercise] threw exception [/paramTag.jsp (line: 11, column: 0) The TLD for the class taglibclass.QueryTag specifies an invalid body-content (JSP) for a SimpleTag.] with root cause
  org.apache.jasper.JasperException: /paramTag.jsp (line: 11, column: 0) The TLD for the class taglibclass.QueryTag specifies an invalid body-content (JSP) for a SimpleTag.  

• web页面截图：
  

• tld配置：

  <tag>
      <name>paramTag</name>
      <tag-class>taglibclass.QueryTag</tag-class>
  
      <attribute>
          <name>driver</name>
          <required>true</required>
          <rtexprvalue>true</rtexprvalue>
      </attribute>
      <attribute>
          <name>url</name>
          <required>true</required>
          <rtexprvalue>true</rtexprvalue>
      </attribute>
      <attribute>
          <name>username</name>
          <required>true</required>
          <rtexprvalue>true</rtexprvalue>
      </attribute>
      <attribute>
          <name>password</name>
          <required>true</required>
          <rtexprvalue>true</rtexprvalue>
      </attribute>
      <attribute>
          <name>sql</name>
          <required>true</required>
          <rtexprvalue>true</rtexprvalue>
      </attribute>
  </tag>

• 解决方案：在tld配置文件中增加：<body-content>empty</body-content> 属性