问题:

G'day,

I appear to have resolved this issue that I kept running into with the 
Jasper Reports plugin...

If I have an action defined as:


        <action name="foo_*" method="{1}" class="com.xxx.foo">


            <result name="success" type="jasper">
              

<param name="location">WEB-INF/foo.jasper</param>


                <param name="format">${contentType}</param>
              

<param name="dataSource">dataSource</param>


              <param name="imageServletUrl">/servlets/image?image=</param>
              

</result> 

           
        </action>


Using the Jasper Reports plugin that ships with S2 current, I get:

16:02:13,220 WARN  [OgnlUtil] Caught OgnlException while setting 
property 'imageServletUrl' on type 
'org.apache.struts2.views.jasperreports.JasperReportsResult'.
java.lang.IllegalAccessException: Class ognl.OgnlRuntime can not access 
a member of class 
org.apache.struts2.views.jasperreports.JasperReportsResult with 
modifiers "protected"
    at sun.reflect.Reflection.ensureMemberAccess(Reflection.java:65)
    at java.lang.reflect.Field.doSecurityCheck(Field.java:960)
    at java.lang.reflect.Field.getFieldAccessor(Field.java:896)
    at java.lang.reflect.Field.set(Field.java:657)
    at ognl.OgnlRuntime.setFieldValue(OgnlRuntime.java:1140)
...

And the imageServletUrl param does not take effect.





解释:



The issue appears to be that all of the setters in JasperReportsResult 
return a JasperReportsResult.  The JavaBeans spec identifies that the 
setter for a simple property must return void.  As a result, 
BeanInfo.getPropertyDescriptors won't see these setters as write methods 
for properties.  With the other props in this class, that's not a 
problem - since they don't have getters, we don't get any 
propertyDescriptors for the properties, and proceed to look for methods 
individually (OgnlRuntime.java:1296).  For imageServletUrl, however, 
there _is_ a valid getter.  BeanInfo sees this as a read-only prop and 
returns a property descriptor for it, showing exactly that.  Back in 
OGNL code, we see that we got a PropertyDescriptor, and don't bother 
asking for all methods.  getSetMethod says "I don't have a set method," 
so OGNL eventually tries to just poke the field, resulting in the above 
error because the field is protected.

Solution: modify the setters in JasperReportsResult to return void.  
This has been confirmed to fix the above problem.

PK

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<result name="showorder" type="redirectAction">

                <!-- struts-sjiang.xml -->

                showOrderfood?desk_id=${desk_id}&amp;orderform_id=${orderform_id}

<!--                <param name="actionName">showOrderfood</param>-->

<!--                <param name="desk_id">${desk_id}</param>-->

<!--                <param name="orderform_id">${orderform_id}</param>-->

</result>