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Date: Wed, 1 Apr 2009 10:46:03 -0700 (PDT)
From: "Musachy Barroso (JIRA)" <jira@apache.org>
To: issues@struts.apache.org
Subject: [jira] Commented: (WW-3068) ExecuteAndWaitInterceptor
  org.apache.struts2.interceptor.ExecuteAndWaitInterceptor.doIntercept(ExecuteAndWaitInterceptor.java:256)
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    [ https://issues.apache.org/struts/browse/WW-3068?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=45813#action_45813 ] 

Musachy Barroso commented on WW-3068:
-------------------------------------

The problem is that configuration is now unmodifiable, so adding a "fake" result to the result config map will cause an exception to be thrown. 

> ExecuteAndWaitInterceptor  org.apache.struts2.interceptor.ExecuteAndWaitInterceptor.doIntercept(ExecuteAndWaitInterceptor.java:256)
> -----------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: WW-3068
>                 URL: https://issues.apache.org/struts/browse/WW-3068
>             Project: Struts 2
>          Issue Type: Bug
>         Environment: Struts-2.1.6
> TC 6.0.14
> JDK 1.6.0_10
> > Subject: Re: ExecuteAndWaitInterceptor not working (2.1.6)
> > > execAndWait in 2.1.6 gives the following exception when it kicks in: (code pasted below)
> > >
> > >
> > > java.lang.UnsupportedOperationException
> > > ??? java.util.Collections$UnmodifiableMap.put(Collections.java:1285)
> > > ??? org.apache.struts2.interceptor.ExecuteAndWaitInterceptor.doIntercept(ExecuteAndWaitInterceptor.java:256)
> > 
>            Reporter: Martin Gainty
>
> public static final String WAIT = "wait";
> org.apache.struts2.interceptor.ExecuteAndWaitInterceptor.java
> .............
> protected String doIntercept(ActionInvocation actionInvocation) throws Exception {
> ..............
>  //sync on the real HttpSession as the session from the context is a wrap that is created
>  //on every request
> synchronized (httpSession)
> {
>             BackgroundProcess bp = (BackgroundProcess) session.get(KEY + name);
>             if ((!executeAfterValidationPass || secondTime) && bp == null)
>             {
>                 bp = getNewBackgroundProcess(name, actionInvocation, threadPriority);
>                 session.put(KEY + name, bp);
>                 performInitialDelay(bp); // first time let some time pass before showing wait page
>                 secondTime = false;
>             }
>             if ((!executeAfterValidationPass || !secondTime) && bp != null && !bp.isDone()) {
>                 actionInvocation.getStack().push(bp.getAction());
>                 Map results = proxy.getConfig().getResults();
>                 if (!results.containsKey(WAIT)) {
>                     LOG.warn("ExecuteAndWait interceptor has detected that no result named 'wait' is available. " +
>                             "Defaulting to a plain built-in wait page. It is highly recommend you " +
>                             "provide an action-specific or global result named '" + WAIT +
>                             "'! This requires FreeMarker support and won't work if you don't have it installed");
>                     // no wait result? hmm -- let's try to do dynamically put it in for you!
>                     ResultConfig rc = new ResultConfig.Builder(WAIT, "org.apache.struts2.views.freemarker.FreemarkerResult")
>                             .addParams(Collections.singletonMap("location", "/org/apache/struts2/interceptor/wait.ftl"))
>                             .build();
> /************ABOVE CODE causes abend************/
>                     results.put(WAIT, rc);
> //http://java.sun.com/j2se/1.4.2/docs/api/java/util/Map.html#put(java.lang.Object,%20java.lang.Object)
>                 }
>                 if (TokenHelper.getToken() != null) {
>                     session.put(TokenHelper.getTokenName(), TokenHelper.getToken());
>                 }
>                 return WAIT;
>             } else if ((!executeAfterValidationPass || !secondTime) && bp != null && bp.isDone()) {
>                 session.remove(KEY + name);
>                 actionInvocation.getStack().push(bp.getAction());
>                 // if an exception occured during action execution, throw it here
>                 if (bp.getException() != null) {
>                     throw bp.getException();
>                 }
>                 return bp.getResult();
>             } else {
>                 // this is the first instance of the interceptor and there is no existing action
>                 // already run in the background, so let's just let this pass through. We assume
>                 // the action invocation will be run in the background on the subsequent pass through
>                 // this interceptor
>                 return actionInvocation.invoke();
>             }
>         }
>     }
> where
> Collections.singletonMap("location", "/org/apache/struts2/interceptor/wait.ftl"))
>  public static <K,V> Map<K,V> singletonMap(K key, V value) {
>  3343           return new SingletonMap<K,V>(key, value);
>  3344       }
> //Here is applicable  SingletonMap
> 3349   private static class SingletonMap<K,V>
> 3350   extends AbstractMap<K,V>
> 3351   implements Serializable {
> 3352   private static final long serialVersionUID = -6979724477215052911L;
> 3353  
> 3354   private final K k;
> 3355   private final V v;
> 3356 
> 3357   SingletonMap(K key, V value) {
> 3358   k = key;
> 3359   v = value;
> 3360   }
> //UnsupportedOperation details
> The "destructive" methods contained in this interface, that is, the methods that modify the map on which they operate, are specified to throw UnsupportedOperationException if this map does not support the operation. If this is the case, these methods may, but are not required to, throw an UnsupportedOperationException if the invocation would have no effect on the map. For example, invoking the #putAll(Map) method on an unmodifiable map may, but is not required to, throw the exception if the map whose mappings are to be "superimposed" is empty.
> //which calls Builder
> http://struts.apache.org/2.1.6/struts2-core/apidocs/com/opensymphony/xwork2/config/entities/ResultConfig.Builder.html
> //which calls addparams method which takes 2 String placeholders for Map
>   ResultConfig.Builder addParams(Map<String,String> params)
> //the code calls singletonMap which is an immutable Map
>  3332       /**
>  3333        * Returns an immutable map, mapping only the specified key to the
>  3334        * specified value.  The returned map is serializable.
>  3335        *
>  3336        * @param key the sole key to be stored in the returned map.
>  3337        * @param value the value to which the returned map maps <tt>key</tt>.
>  3338        * @return an immutable map containing only the specified key-value
>  3339        *         mapping.
>  3340        * @since 1.3
>  3341        */
>  3342       public static <K,V> Map<K,V> singletonMap(K key, V value) {
>  3343           return new SingletonMap<K,V>(key, value);
>  3344       }
> so the fix would be to replace
> Collections.SingletonMap
>                             .addParams(Collections.singletonMap("location", "/org/apache/struts2/interceptor/wait.ftl"))
> with 2 plain strings for addParams e.g.
>                             .addParams("location", "/org/apache/struts2/interceptor/wait.ftl"))
> ?
> Martin

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