-none- 2007-08-15 - By red phoenix
Back
For general Java class,we can make construction function,like this:
public class test{
String a;
public test(String a){
this.a=a;
}
}
I don't know if I can do it like above code under struts2 action,for some
reason,I want to initialize some variable and assign some value to it,like
follows:
public class MyClass extends ActionSupport{
private ....;
public MyClass(SomeType s){
//make some common operaction,such get session and so on,because I
want to run them only once
}
public String execute() throws Exception {
....
}
public String .....{
}
...
}
I can successly compile above code,but when I run above code,it will say
error:
1)MyClass action error
2)java.lang.NullException because some code in MyClass(SomeType s)
When I remove the code in the MyClass(SomeType s) into execute() function,it
can run well. I am puzzle with it! Anybody could tell me how to do it? An
example is better.
Thanks,
phoenix
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