user Digest 16 Jul 2009 08:52:02 -0000 Issue 8754

Topics (messages 200763 through 200779):

Re: Initializing Application
 200763 by: Pawe³ Wielgus
 200768 by: Balwinder Kumar

Need to update one single field via Ajax
 200764 by: Bruno

Re: how to configure struts2 for /*.action?
 200765 by: Dave Newton
 200766 by: Martin Gainty
 200767 by: Struts Two
 200771 by: ravi_eze

Re: Struts2 Action Class and EJB Injection
 200769 by: Robin Mannering

org.apache.jasper.JasperException: The Struts dispatcher cannot be found.
 200770 by: jayadevan
 200772 by: Lukasz Lenart
 200773 by: jayadevan
 200774 by: Lukasz Lenart
 200776 by: jayadevan
 200777 by: jayadevan

Re: ParameterInterceptor problem
 200775 by: Say Jon
 200778 by: Robert Graf-Waczenski
 200779 by: Say Jon

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Thanks Pawel and David for your response. I would like to evaluate both
option before proceeding.

Regards,
Balwinder Kumar

Paweł Wielgus wrote:
> Hi,
> i'm initing my apps by implementing ServletContextListener and
> registering it in web.xml like that:
> <web-app>
>  <listener>
>    <listener-class>com.my.ServletContextListenerImplementation</listener-class>
>  </listener>
> </web-app>
>
> It has nothing to do with struts but i hope that's what You are looking for.
>
> Best greetings,
> Paweł Wielgus.
>
>
> 2009/7/15 David Canos <davidcanos@(protected)>:
>  
>> I think Struts 2 uses a Struts2Filter to do the init issues of the each
>> request
>>
>> 2009/7/15 Balwinder Kumar <balwinder.mca@(protected)>
>>
>>  
>>> Hi All,
>>>
>>> I am trying to develop a framework based on Struts 2, I am finding it very
>>> difficult to decide where to put the code that is generally called in
>>> ActionServlet init method. Any pointer towards this.
>>> Thanks in advance.
>>>
>>> Regards,
>>> Balwinder Kumar
>>>
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>>>
>>>    
>
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>  

Hey guys, I'm using Struts 2.1.6 with Spring...

I've always used <sx:div> for auto refresh, whenever is necessary, but I now
I need to keep updated one single field and I'm not allowed to use sx:div
with updateFreq

So I'll have to make it all manually using JavaScript. The problem is that I
simply don't know how to do it. Any suggestions?

Thanks

--
Bruno Morelli Vargas
Mail: brunomv@(protected)
Msn: brunom_@(protected)
Icq: 165055101
Skype: morellibmv

look at a working example.. showcase contain these *.action entries in /WEB-INF/web.xml

   <servlet>
    <servlet-name>faces</servlet-name>
    <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
   </servlet>
      <servlet>
    <servlet-name>JspSupportServlet</servlet-name>
    <servlet-class>org.apache.struts2.views.JspSupportServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
   </servlet>

   <!-- JavaServer Faces Servlet Mapping, not called directly -->
    <servlet-mapping>
    <servlet-name>faces</servlet-name>
    <url-pattern>*.action</url-pattern>
   </servlet-mapping>

Martin
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> Date: Wed, 15 Jul 2009 16:29:04 -0400
> From: newton.dave@(protected)
> To: user@(protected)
> Subject: Re: how to configure struts2 for /*.action?
>
> ravi_eze wrote:
> > We are not serving static content.
>
> Not *you*, *Struts 2*.
>
> > What will happen if i do *.action?
> > Why did the doc say /* *should* be in web.xml?
>
> Because of what you've already been told a couple of times now.
>
> Dave
>
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Thanks for the example. I shall download the source and give it a go.

Thanks again.

Nathan Schulte wrote:
> Robin Mannering <robin <at> mtndesigns.co.uk> writes:
>  
>> Can you please tell me how you obtained the EJB plugin and a short
>> example of using it.
>>
>> I would prefer to use this if possible.
>>  
>
> Sorr, I misspoke earlier. I'm actually using the EJB3 JBoss Plugin, from here
> http://cwiki.apache.org/S2PLUGINS/ejb3-jboss-plugin.html.
>
> However, browsing the source for the EJB3 Plugin, the annotations and even
> classes are named the same, so the following example should still apply;
> http://pastebin.com/f7053a2bc.
>
>
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>  

Hi Robert,
Thanks for the reply. I'm heartened that Struts 2 have a live community that
can help with issues. Firstly, yes you are right that I'm using a
ModelDriven.

I have a super class ModelDrivenAction which my other action classes extend
from.

public void prepare() throws Exception {
super.prepare();
BaseEntity model = null;
if (getId() != null) {
model = (BaseEntity) session.get(getEmbeddedModelKey() + getId());
if (model == null) model = service.retrieve(modelClass, getId());
}
if (model == null && !(this instanceof EmbeddedDrivenAction)) model =
getNewModel();

setModel(model);
}

I have another class EmbeddedDrivenAction which subclasses
ModelDrivenAction:

public void prepare() throws Exception {
//call modeldriven's prepare to load in the model
super.prepare();

if (embeddedModelClass != null)
setEmbeddedModel((IEmbeddable)Class.forName(embeddedModelClass).newInstance());
Object suffixObj = (getId()!= null?getId():getParentId());
String suffix = "";
if (suffixObj != null) suffix = suffixObj.toString();
String sessionKey = getEmbeddedModelKey() + suffix;
//for main action, will use id
if (session.get(sessionKey) == null) { // for main action
if (getModel() == null) setModel(getNewModel());
if (!WebUtility.getInstance().isReloadPagePreservingValues(session))
removeSessionObjects();
session.put(sessionKey, getModel());
}
//for embedded action, will use parentid
else {
setModel((BaseEntity) session.get(sessionKey));
}
}

This is how my model is initialized. It will first check if the model have
been put into the session (I'm using an architecture whereby the user is
using 2 or more screens for the same model object). If eventually the model
is not found, the getNewModel() object will return a newly instantiated
model. In any case, a instantiated model will definitely be returned.

According to my first email, my call chain is "userAddress.country.id". If I
don't remember wrongly, if my userAddress is null, Struts will initialize it
for me. If my country is null, Struts will also initialize it for me. After
both are initialized, the ID is set. In all cases, Struts will initialize
the objects in the chain and apply the final value. Pls correct me if I'm
wrong here.

For point 3, what do you mean by "not ok"? Pls elaborate on that if
possible.

My model class code is a regular POJO:


public class UserAccountAddress extends
sg.com.stellar.ecomm.royalefam.entity.BaseEntity implements
java.io.Serializable, IEmbeddable {

// Fields

private Integer id;

private UserAccount userAccount;

private Country country; *//getters and setters have been set*

...
}

Thanks in advance for any help rendered!

Regards.
W.SayJon

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On Wed, Jul 15, 2009 at 9:57 PM, Robert Graf-Waczenski <rgw@(protected):

> Even though you are pretty vague in what you write below, i have a few
> pointers for you:
>
> 1) Check (and tell us) if you designed your action implements the
> ModelDriven interface (guessed from you talking about getModel() below)
> 2) Maybe your getModel() returns an improperly initialized instance when it
> is called several times. If the call chain you quote below somewhere yields
> a null value, Struts2 is incapable of applying your parameter value because
> it does not have an instance to set the value at.
> 3) The fact that the problem goes away when you restart Tomcat indicates
> that the getModel() return value depends on the user's session and maybe the
> value is ok when the session is fresh and the value is not ok when you call
> your action repeatedly. (Again, guesswork here...)
>
> Quoting your action source code and your model class source code would help
> us helping you.
>
> Robert
>
> Say Jon schrieb:
>
> Hi all,
>> I have been using Struts 2 for a while now and I am pulling my hair over
>> the
>> following issue. At times, when my parameter name contains a period, the
>> Parameterinterceptor doesn't seem to be applied properly. For example I
>> have
>> a parameter "userAddress.country.id" which points to
>> getModel().getUserAddress().getCountry().setId() right? This works most of
>> the time but occasionally, the value doesn't get set. I know this because
>> my
>> validation keeps denying the user saying that "Country is required" when
>> the
>> user have indeed chosen a country (problem because the parameter is not
>> applied properly). The problem goes away when I restart Tomcat.
>>
>> Anyone facing the same problem? I'm using Struts 2.1.6 by the way.
>>
>> Regards.
>> W.SayJon
>>
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>> reliance on the contents of this information is strictly prohibited and
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>> be unlawful.
>>
>>
>>
>
>
>
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>

Thanks Robert for your inputs.
Well I'm sure that Struts does initialize all null objects along the object
chain if they are null, because for 90% of the time, this works. I do not
explicitly initialize objects along the object chain in my code. For most of
the time, Struts detects that it is null and therefore initializes it for me
till the final property which it sets properly.

As mentioned this problem occurs intermittently and its so frustrating for
apps that are in production because of its unpredictability. I will follow
your advice to initialize all objects in the object chain and see if it
helps.

Thanks for your help!

Regards.
W.SayJon

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On Thu, Jul 16, 2009 at 3:47 PM, Robert Graf-Waczenski <rgw@(protected):

> Say Jon schrieb:
>
>> public void prepare() throws Exception {
>> super.prepare();
>> BaseEntity model = null;
>> if (getId() != null) {
>> model = (BaseEntity) session.get(getEmbeddedModelKey() + getId());
>> if (model == null) model = service.retrieve(modelClass, getId());
>> }
>> if (model == null && !(this instanceof EmbeddedDrivenAction)) model =
>> getNewModel();
>>
>> setModel(model);
>> }
>>
>>
>
> This code does not look particularly wrong. It does what we also do
> frequently (without the service.retrieve() part and without the user using
> several sessions for his work). So i guess that your problem is not located
> here.
>
>
> I have another class EmbeddedDrivenAction which subclasses
>> ModelDrivenAction:
>>
>> public void prepare() throws Exception {
>> //call modeldriven's prepare to load in the model
>> super.prepare();
>>
>> if (embeddedModelClass != null)
>>
>> setEmbeddedModel((IEmbeddable)Class.forName(embeddedModelClass).newInstance());
>> Object suffixObj = (getId()!= null?getId():getParentId());
>> String suffix = "";
>> if (suffixObj != null) suffix = suffixObj.toString();
>> String sessionKey = getEmbeddedModelKey() + suffix;
>> //for main action, will use id
>> if (session.get(sessionKey) == null) { // for main action
>> if (getModel() == null) setModel(getNewModel());
>> if (!WebUtility.getInstance().isReloadPagePreservingValues(session))
>> removeSessionObjects();
>> session.put(sessionKey, getModel());
>> }
>> //for embedded action, will use parentid
>> else {
>> setModel((BaseEntity) session.get(sessionKey));
>> }
>> }
>>
>> This is how my model is initialized. It will first check if the model have
>> been put into the session (I'm using an architecture whereby the user is
>> using 2 or more screens for the same model object). If eventually the
>> model
>> is not found, the getNewModel() object will return a newly instantiated
>> model. In any case, a instantiated model will definitely be returned.
>>
>>
>
> I didn't check (and in fact, not completely understand) your code above,
> but i think you should investigate a bit further into the area below:
>
>> According to my first email, my call chain is "userAddress.country.id".
>> If I
>> don't remember wrongly, if my userAddress is null, Struts will initialize
>> it
>> for me. If my country is null, Struts will also initialize it for me.
>> After
>> both are initialized, the ID is set. In all cases, Struts will initialize
>> the objects in the chain and apply the final value. Pls correct me if I'm
>> wrong here.
>>
>>
>
> I can't tell you off the top of my head, but i'd suggest to verify your
> assumption with the debugger. If your assumption is correct, theny you
> should see calls to getUserAddress(), getCountry() and getId(). We here in
> our application frequently use nested instances and we always make sure that
> anything that is necessary for such a call chain is initialized properly by
> our own code. My strong guess is that Struts does not initalize the objects
> for you. (And, btw, even if it did: How would your container class obtain
> the correct reference to the object created for you by Struts?) And how
> would the ultimate setter be then called on an instance that is referenced
> from the object at the start of your call chain? Try to use lazy
> initialization and reference bookkeeping when your getter method is accessed
> and you find your local member variable pointer null.
>
>> For point 3, what do you mean by "not ok"? Pls elaborate on that if
>> possible.
>>
>>
>
> By "not ok" i meant that your parent object does not have all its child
> objects correctly initialized so that when Struts calls along your object
> nesting chain, it encounters null return values and either has to deal with
> NPEs or (if your guess that it initializes objects on the fly which i'm
> still a bit unsure about) it creates new instances that only live in the
> nether outside of your original object. So if you later need to query the
> value of an object further down the call chain, all parent objects need
> correct references to the child objects. I'm not aware of any mechanism in
> Struts to establish such a proper reference chain for you, so you need to
> make sure that is exists before Struts comes into play.
>
> The behavior you describe hints that your reference chain somehow gets
> broken during the lifetime of your model object so that your call chains
> don't work correctly anymore.
>
> Robert
>
>
>
>
>
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