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https://issues.apache.org/struts/browse/WW-1803?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ted Husted resolved WW-1803.
----------------------------
Resolution: Fixed
Fix Version/s: 2.1.0
Completed: At revision: 520151, 520152
> ScopeIntercaptor null references on session serialization
> ---------------------------------------------------------
>
> Key: WW-1803
> URL: https://issues.apache.org/struts/browse/WW-1803
> Project: Struts 2
> Issue Type: Bug
> Components: Interceptors
> Affects Versions: 2.0.6
> Environment: Windows 2000. J2re1.4.2. Tomcat 5.5.20.
> Reporter: Sylvain RIBEYRON
> Fix For: 2.0.7, 2.1.0
>
>
> ScopeInterceptor uses a NULL object to store null values in session scope.
> When restarting tomcat, sessions are serialized on hard drive, and they are
> reloaded. NULL object is also serialized. But as struts2 application starts,
> when ScopeInterceptor class is loaded, it creates a new static field "NULL"
> that is not the same reference as the serialised one.
> As a result, when test "o==NULL" is performed in method nullConvert, it
> return false, whereas it should return true. Then, fields in action that
> should remain to "null" value, are initialized with a "NULL" string !
> To resolve this issue, introduce a new NULLClass, and check if object o
> extends this class, instead of testing reference equality. Use the following
> code as a replacement:
> private static class NULLClass implements Serializable {
> public String toString() {
> return "NULL";
> }
> public boolean equals(Object obj) {
> return obj == null || (obj instanceof NULLClass);
> }
> }
> private static final Object NULL = new NULLClass();
> private static final Object nullConvert(Object o) {
> if (o == null) {
> return NULL;
> }
> if (o == NULL || NULL.equals(o)) {
> return null;
> }
> return o;
> }
> Struts 2 is a great job ! Thanks.
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