org.apache.jasper.JasperException: Index: 0, Size: 0
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:358)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)


root cause

java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
java.util.ArrayList.RangeCheck(Unknown Source)
java.util.ArrayList.get(Unknown Source)
org.apache.jsp.ses.list_jsp._jspService(list_jsp.java:67)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:133)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:311)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)



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数组越界
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你的数组里面没有任何元素啊，你硬是要取出第一个元素，当然报错啦，就是所谓的数组越界了
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你 ArrayList 数组的下标越界了~~ 页面取值的地方看看， 那里的ArrayList有问题

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判断一下arr.size()
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arr.size() > 0 再进行取值，我估计你多数是for()语句之类的取值吧