java.lang.NullPointerException:No JFreeChart object found on the stack with name chart---------------------------------上面是action-------------------------------------下面是xml 配置--------------------

java.lang.NullPointerException:No JFreeChart object found on the stack with name chart---------------------------------上面是action-------------------------------------下面是xml 配置--------------------
java.lang.NullPointerException:No JFreeChart object found on the stack with name chart

---------------------------------上面是action-------------
------------------------下面是xml 配置--------------------

java.lang.NullPointerException:No JFreeChart object found on the stack with name chart---------------------------------上面是action-------------------------------------下面是xml 配置--------------------
错误意思是说,你的页面返回中并没有chart(ChartResult)
我看你Action的exectute方法只是初始化了JFreeChart并没有ChartResult的属性被初始化或赋值
这样旧导致struts过滤器找不到定义的chart值报错
可尝试在Action中添加ChartResult属性并在execute中赋值