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https://issues.apache.org/jira/browse/WW-3822?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13420657#comment-13420657
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Hudson commented on WW-3822:
----------------------------
Integrated in Struts2 #507 (See [https://builds.apache.org/job/Struts2/507/])
WW-3822 adds check if setter was defined as this can be read-only property
(Revision 1364624)
Result = SUCCESS
lukaszlenart :
Files :
*
/struts/struts2/trunk/xwork-core/src/main/java/com/opensymphony/xwork2/conversion/impl/DefaultObjectTypeDeterminer.java
> Struts 2 and Generic Class - Null Pointer Exception
> ---------------------------------------------------
>
> Key: WW-3822
> URL: https://issues.apache.org/jira/browse/WW-3822
> Project: Struts 2
> Issue Type: Bug
> Components: Core Actions
> Affects Versions: 2.3.1.1
> Environment: Windows 7 - Java 6 - Tomcat 7
> Reporter: Daniel Matthews-Grout
> Assignee: Lukasz Lenart
> Priority: Minor
> Fix For: 2.3.5
>
>
> I have a class that extends a generic abstract class and types that generic -
> e.g.
> class MyClass extends AbstractClass<Integer> ..
> class AbstractClass<ID extends Serializable> {
> public abstract ID getId();
> }
> JSP:
> <s:property value="myClass.id"/>
> The abstract class defined an abstract getter that I implemented in the
> concrete class. I then referenced this getter in the JSP of a Struts 2
> action and got the following:
> java.lang.NullPointerException
> at
> com.opensymphony.xwork2.conversion.impl.DefaultObjectTypeDeterminer.getClass(DefaultObjectTypeDeterminer.java:314)
> at
> com.opensymphony.xwork2.conversion.impl.DefaultObjectTypeDeterminer.getKeyClass(DefaultObjectTypeDeterminer.java:93)
> at
> com.opensymphony.xwork2.ognl.accessor.XWorkMapPropertyAccessor.getProperty(XWorkMapPropertyAccessor.java:93)
> at ognl.OgnlRuntime.getProperty(OgnlRuntime.java:2303)
> at ognl.ASTProperty.getValueBody(ASTProperty.java:114)
> at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212)
> at ognl.SimpleNode.getValue(SimpleNode.java:258)
> at ognl.ASTChain.getValueBody(ASTChain.java:141)
> at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212)
> at ognl.SimpleNode.getValue(SimpleNode.java:258)
> at ognl.Ognl.getValue(Ognl.java:494)
> at ognl.Ognl.getValue(Ognl.java:458)
> ....
> So what I had to do was to add a another get/set pair in the concrete class
> that updated/read from the same field. This stopped the error.
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