Ognl. Ognlexception:target is null for setProperty (NULL, "XXXX" ...)

Today, I met this wonderful problem, and then I went back and forth to find out the problem after a complete code written by a predecessor.

The error is probably described as:

Warning: Error setting expression ' XXX ' with value ' [Ljava.lang.string;@1cb2dd1 '
Ognl. Ognlexception:target is null for setProperty (NULL, "XXX", [Ljava.lang.string;@1cb2dd1)
At OGNL. Ognlruntime.setproperty (ognlruntime.java:2219)

Specific reasons I am not particularly clear, just from the wrong hint can be knows, may cause the cause of this error will be more, the code is interlocking, any link error will fall short, then master every link finally certainly will not have a problem.

Link One: Front desk

(1) The input value will be received from the JSP interface

<input type = "text" name = "Condition.querytype" >

(2) Link form pass-through value

<a href= "manage/patient!querypatient.action?condition.querytype = FirstPage" >

Be sure: the form of Condition.querytype is an instance of a class. property. Like User.Name and so on.

Link two: Condition Class and Action class

Be sure: All the attributes in this two class must have a get and set method.

At present I know these two links, grasp the good can solve this problem.

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Ognl. Ognlexception:target is null for setProperty (NULL, "XXXX" ...)