user Digest 8 Jan 2010 03:16:24 -0000 Issue 8977

Topics (messages 204548 through 204570):

Re: freemarker error in select tag
 204548 by: Johannes Geppert

Whats the best way of using Google Inject Annotation in Struts
 204549 by: Saeed Iqbal

Path page.logon does not start with a "/" character" Problem
 204550 by: Andy T

How to nest Struts Tags
 204551 by: RogerV
 204567 by: Gabriel Belingueres

Re: struts2 and tables
 204552 by: Chris Pratt
 204553 by: Chris Pratt
 204559 by: Sergio
 204561 by: Sergio
 204563 by: Chris Pratt

Struts, Tomcat, JNDI, JDBC without use of an ORM Library such as Hibernate
 204554 by: Jasvinder S. Bahra
 204555 by: Chris Pratt
 204556 by: Greg Lindholm
 204557 by: Brian Thompson
 204560 by: Jasvinder S. Bahra
 204562 by: Jasvinder S. Bahra
 204564 by: Chris Pratt
 204565 by: Jasvinder S. Bahra

Action Approach
 204558 by: CRANFORD, CHRIS
 204568 by: Gabriel Belingueres

Guice integration
 204566 by: Saeed Iqbal

Why do i possibly get this error.
 204569 by: Saeed Iqbal
 204570 by: Saeed Iqbal

Administrivia:

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com.google.inject.Inject;

--
Saeed Iqbal
Independant Consultant
J2EE - Application Architect / Developer

You can refer to the DisplayTag documentation about what collections they
support, there are quite a few. I usually use a java.util.List of
JavaBean's And yes, you'll have to use JDBC, JPA, Ibatis, Hibernate... to
get that data from the database into a structure that can be displayed.

As for your other question, take a look at the last column in my example,
that's exactly what it does.
(*Chris*)

On Thu, Jan 7, 2010 at 1:05 AM, Sergio
<killing-is-my-business@(protected):

> but i don't understand the data structure to hold the users. When you get
> the ResultSet from mysql, how do you put it into the list? Without using
> hibernate or similar, i've tried with several collections, for example a
> <String >, Map <String><String>. The first string holds the name or user id,
> and the map holds attribute-value pair. No success, i think that is a bad
> solution.
>
> and another question: i need the user id be passed to another action as a
> parameter. I've tried with a s:form and a hidden field, something like
> <input type="hidden" value="<s:property>"> is the idea. It's about an online
> shop, and i'm having problems with:
>
> 1.- listing products from mysql
> 2.- adding products to the cart (from a mysql products list
>
> i'm a little newbie with struts.....
>
> regards
>
> --
> Sergio
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: user-unsubscribe@(protected)
> For additional commands, e-mail: user-help@(protected)
>
>

If all you want to do is display data in a simple HTML table, this is
definitely the way to go. If you need pagination or columnar sorting
support, I'd go with DisplayTag.
(*Chris*)

On Thu, Jan 7, 2010 at 1:39 AM, xerax nono <xrx1001@(protected):

> you can use iterator over a collection.
> see in
>
> http://www.vaannila.com/struts-2/struts-2-example/struts-2-crud-example-1.html
>
> <s:iterator value="userList" status="userStatus">
> 44.        <tr
> 45.           class="<s:if test="#userStatus.odd == true ">odd</s:if>
> <
> s:else>even</s:else>">
> 46.           <td><s:property value="name" /></td>
> 47.           <td><s:property value="gender" /></td>
> 48.           <td><s:property value="country" /></td>
> 49.           <td><s:property value="aboutYou" /></td>
> 50.           <td><s:property value="mailingList" /></td>
> 51.           <td>
> 52.           <s:url id="editURL" action="editUser">
> 53.             <s:param name="id" value="%{id}"></s:param>
> 54.           </s:url>
> 55.           <s:a href="%{editURL}">Edit</s:a>
> 56.           </td>
> 57.           <td>
> 58.           <s:url id="deleteURL" action="deleteUser">
> 59.             <s:param name="id" value="%{id}"></s:param>
> 60.           </s:url>
> 61.           <s:a href="%{deleteURL}">Delete</s:a>
> 62.           </td>
>
>
> 2010/1/7 Frans Thamura <frans@(protected)>
>
> > can share how the struts2 work with display tag
> >
> >
> > sorry never use this also, how the display tag work with List when we
> > submit the grid
> >
> > F
> >
> >
> >
> >
> > On Thu, Jan 7, 2010 at 7:00 AM, Chris Pratt <thechrispratt@(protected)>
> > wrote:
> > > We use DisplayTag (http://www.displaytag.org), it works pretty well.
> > > (*Chris*)
> > >
> > > On Wed, Jan 6, 2010 at 3:28 PM, Sergio
> > > <killing-is-my-business@(protected):
> > >
> > >> Hi, people, how can i show a table into a jsp from the struts action?
> > Are
> > >> there a simple method for doing that? I've tried with java collections
> > into
> > >> the action and "property" tag into the jsp with no success.
> > >>
> > >> thanks in advance
> > >>
> > >> --
> > >> Sergio
> > >>
> > >>
> > >> ---------------------------------------------------------------------
> > >> To unsubscribe, e-mail: user-unsubscribe@(protected)
> > >> For additional commands, e-mail: user-help@(protected)
> > >>
> > >>
> > >
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: user-unsubscribe@(protected)
> > For additional commands, e-mail: user-help@(protected)
> >
> >
>
>
> --
> Serafin Hernandez Blazquez
> 649 81 64 87
>

I'm not positive but you might try:

<s:param name="politico" value="${this}"/>

(*Chris*)

On Thu, Jan 7, 2010 at 4:09 PM, Sergio
<killing-is-my-business@(protected):

> Sergio escribió:
>
> Chris Pratt escribió:
>>
>>> You can refer to the DisplayTag documentation about what collections they
>>> support, there are quite a few. I usually use a java.util.List of
>>> JavaBean's And yes, you'll have to use JDBC, JPA, Ibatis, Hibernate... to
>>> get that data from the database into a structure that can be displayed.
>>>
>>> As for your other question, take a look at the last column in my example,
>>> that's exactly what it does.
>>> (*Chris*)
>>>
>>> On Thu, Jan 7, 2010 at 1:05 AM, Sergio
>>> <killing-is-my-business@(protected):
>>>
>>>
>>>
>>>> but i don't understand the data structure to hold the users. When you
>>>> get
>>>> the ResultSet from mysql, how do you put it into the list? Without using
>>>> hibernate or similar, i've tried with several collections, for example a
>>>> <String >, Map <String><String>. The first string holds the name or user
>>>> id,
>>>> and the map holds attribute-value pair. No success, i think that is a
>>>> bad
>>>> solution.
>>>>
>>>> and another question: i need the user id be passed to another action as
>>>> a
>>>> parameter. I've tried with a s:form and a hidden field, something like
>>>> <input type="hidden" value="<s:property>"> is the idea. It's about an
>>>> online
>>>> shop, and i'm having problems with:
>>>>
>>>> 1.- listing products from mysql
>>>> 2.- adding products to the cart (from a mysql products list
>>>>
>>>> i'm a little newbie with struts.....
>>>>
>>>> regards
>>>>
>>>> --
>>>> Sergio
>>>>
>>>>
>>>> ---------------------------------------------------------------------
>>>> To unsubscribe, e-mail: user-unsubscribe@(protected)
>>>> For additional commands, e-mail: user-help@(protected)
>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>>
>> wow, i think i got. I'll take a look.
>>
>> thank you very much
>>
>> my point is that i have a property which is a String, and i need that
> string in two ways: as a literal string and as a parameter to another
> action. Using "s:property", something like this:
>
>   <table>
>   <s:iterator value="#session.carrito">
>     <tr>
>        <td><s:property />
>        </td>
>        <td><s:url id="idResta" value="/Del.action">
>             <s:param name="politico" value="[0]"></s:param>
>           </s:url>
>           <sx:a accesskey="6" href="%{idResta}"
> targets="secondaryContent" >Fuera</sx:a>
>        </td>
>     </tr>
>   </s:iterator>
>   </table>
>
> sessio.carrito is a String ArrayList and iterator works. Each of that
> string must be passed to another action, say Action2, like a form with a
> hidden field. During Action2 (which delete "politico" from session.carrito)
> there's a *java.lang.ArrayIndexOutOfBoundsException: -1*
>
> I thought that "[0]" helds the actual value, same as "<s:property />". Into
> "param" tag i've tried also with value="{ #this }" but i got that java
> exception.
>
> Something like:
>
> <s:param name="politico" value="<s:property />"></s:param>
>
> is my literal desire :)
>
> My struts action has private String politico and getters y setters. I'm not
> really sure if "politco" is viewed by Action2.
>
>
> regards
> **
>
> --
> Sergio
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: user-unsubscribe@(protected)
> For additional commands, e-mail: user-help@(protected)
>
>

We use Spring (and Spring-LDAP) for that layer. It works great, manages all
our DAO's and their resources, and then injects them into the Actions as
needed.
(*Chris*)

On Thu, Jan 7, 2010 at 10:06 AM, Jasvinder S. Bahra <
bbdl21548@(protected):

> Does anyone know of any techniques that would allow a Database Access
> Object (DAO) to be used from the various actions that make up a Struts
> application?
>
> I have a DAO which, when instantiated, acquires a data source from the
> servlet container (in this case, Apache Tomcat). Thereafter, I can execute
> the various methods provided by the object which use the data source to
> execute SQL queries/statements, and return usable data in the form of
> Strings, Maps, Vectors etc, as appropriate.
>
> Instantiating the DAO in the execute() method of each of my action's
> however, seems a little inefficient. Does Struts provide any way to
> instantiate the object once and then make it available for the lifetime of
> the container (in a way that my Actions can access it)?
>
> Note please that i'm well aware that this is a somewhat non-standard
> approach to database interaction. I am intending to investigate Hibernate
> (and like) at some point, but for the time being I want to avoid such.
>
> This is the skeleton of the DAO I have in mind...
>
> ----------------------------------------------------------------------
> import java.sql.*;
> import javax.sql.*;
> import javax.naming.*;
> import javax.servlet.*;
>
> public class MyDataAccessObject {
>
>  private DataSource dataSource;
>  private String SQL;
>
>  public MyDataAccessObject() throws Exception {
>
>     try {
>       Context init = new InitialContext();
>       Context ctx = (Context) init.lookup("java:comp/env");
>       dataSource = (DataSource) ctx.lookup("jdbc/mysqldb");
>     } catch (NamingException ne) {
>       throw new Exception("Cannot retrieve java:comp/env/jdbc/mysqldb",
> ne);
>     }
>
>     SQL = null;
>  }
>
>  public String getValue(String name) {
>
>     Connection dbcon = null;
>     PreparedStatement pstmt = null;
>     ResultSet rs = null;
>
>     String value = null;
>
>     try {
>       dbcon = dataSource.getConnection();
>
>       SQL = "SELECT value FROM table WHERE name = ?";
>
>       pstmt = dbcon.prepareStatement(SQL);
>       pstmt.setString(1, name);
>
>       rs = pstmt.executeQuery();
>       while (rs.next()) {
>          value = rs.getString("value");
>       }
>
>       rs.close();
>       rs = null;
>
>       pstmt.close();
>       pstmt = null;
>
>       dbcon.close();
>       dbcon = null;
>     } catch (SQLException ex) {
>       log(ex);
>     } catch (Exception ex) {
>       log(ex);
>     } finally {
>       if (rs != null) {
>          try { rs.close(); } catch (Exception fe1) { log(fe1); }
>          rs = null;
>       }
>
>       if (pstmt != null) {
>          try { pstmt.close(); } catch (Exception fe2) { log(fe2); }
>          pstmt = null;
>       }
>
>       if (dbcon != null) {
>          try { dbcon.close(); } catch (Exception fe3) { log(fe3); }
>          dbcon = null;
>       }
>     }
>
>     SQL = null;
>     return value;
>  }
>
>  private void log(...) {
>     // Handle logging
>  }
> }
> ----------------------------------------------------------------------
>
> Thanks,
>
> Jazz
>
>
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: user-unsubscribe@(protected)
> For additional commands, e-mail: user-help@(protected)
>
>

I'll echo the Spring suggestion. It simplifies Action-level programming by
quite a bit.

On the flip side, it requires some extra XML configuration, but IMO it's a
good tradeoff.

-Brian


On Thu, Jan 7, 2010 at 12:18 PM, Chris Pratt <thechrispratt@(protected):

> We use Spring (and Spring-LDAP) for that layer. It works great, manages
> all
> our DAO's and their resources, and then injects them into the Actions as
> needed.
>  (*Chris*)
>
> On Thu, Jan 7, 2010 at 10:06 AM, Jasvinder S. Bahra <
> bbdl21548@(protected):
>
> > Does anyone know of any techniques that would allow a Database Access
> > Object (DAO) to be used from the various actions that make up a Struts
> > application?
> >
> > I have a DAO which, when instantiated, acquires a data source from the
> > servlet container (in this case, Apache Tomcat). Thereafter, I can
> execute
> > the various methods provided by the object which use the data source to
> > execute SQL queries/statements, and return usable data in the form of
> > Strings, Maps, Vectors etc, as appropriate.
> >
> > Instantiating the DAO in the execute() method of each of my action's
> > however, seems a little inefficient. Does Struts provide any way to
> > instantiate the object once and then make it available for the lifetime
> of
> > the container (in a way that my Actions can access it)?
> >
> > Note please that i'm well aware that this is a somewhat non-standard
> > approach to database interaction. I am intending to investigate
> Hibernate
> > (and like) at some point, but for the time being I want to avoid such.
> >
> > This is the skeleton of the DAO I have in mind...
> >
> > ----------------------------------------------------------------------
> > import java.sql.*;
> > import javax.sql.*;
> > import javax.naming.*;
> > import javax.servlet.*;
> >
> > public class MyDataAccessObject {
> >
> >  private DataSource dataSource;
> >  private String SQL;
> >
> >  public MyDataAccessObject() throws Exception {
> >
> >     try {
> >       Context init = new InitialContext();
> >       Context ctx = (Context) init.lookup("java:comp/env");
> >       dataSource = (DataSource) ctx.lookup("jdbc/mysqldb");
> >     } catch (NamingException ne) {
> >       throw new Exception("Cannot retrieve
> java:comp/env/jdbc/mysqldb",
> > ne);
> >     }
> >
> >     SQL = null;
> >  }
> >
> >  public String getValue(String name) {
> >
> >     Connection dbcon = null;
> >     PreparedStatement pstmt = null;
> >     ResultSet rs = null;
> >
> >     String value = null;
> >
> >     try {
> >       dbcon = dataSource.getConnection();
> >
> >       SQL = "SELECT value FROM table WHERE name = ?";
> >
> >       pstmt = dbcon.prepareStatement(SQL);
> >       pstmt.setString(1, name);
> >
> >       rs = pstmt.executeQuery();
> >       while (rs.next()) {
> >          value = rs.getString("value");
> >       }
> >
> >       rs.close();
> >       rs = null;
> >
> >       pstmt.close();
> >       pstmt = null;
> >
> >       dbcon.close();
> >       dbcon = null;
> >     } catch (SQLException ex) {
> >       log(ex);
> >     } catch (Exception ex) {
> >       log(ex);
> >     } finally {
> >       if (rs != null) {
> >          try { rs.close(); } catch (Exception fe1) { log(fe1); }
> >          rs = null;
> >       }
> >
> >       if (pstmt != null) {
> >          try { pstmt.close(); } catch (Exception fe2) { log(fe2); }
> >          pstmt = null;
> >       }
> >
> >       if (dbcon != null) {
> >          try { dbcon.close(); } catch (Exception fe3) { log(fe3); }
> >          dbcon = null;
> >       }
> >     }
> >
> >     SQL = null;
> >     return value;
> >  }
> >
> >  private void log(...) {
> >     // Handle logging
> >  }
> > }
> > ----------------------------------------------------------------------
> >
> > Thanks,
> >
> > Jazz
> >
> >
> >
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: user-unsubscribe@(protected)
> > For additional commands, e-mail: user-help@(protected)
> >
> >
>

Good luck, and let us know how it goes.
(*Chris*)

On Thu, Jan 7, 2010 at 3:44 PM, Jasvinder S. Bahra <
bbdl21548@(protected):

> We use Spring (and Spring-LDAP) for that layer. It works great, manages
>> all
>> our DAO's and their resources, and then injects them into the Actions as
>> needed.
>>
>
> Chris,
>
> At the moment, i'm trying to reaquaint myself with the ins and out of
> Struts (I haven't touched it for several years), so I dont (yet) want to
> introduce any additional libraries.
>
> I'm sure its possible to do what I need without them.
>
> Thanks for the suggestion anyway.
>
>
> Jazz
>
>
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: user-unsubscribe@(protected)
> For additional commands, e-mail: user-help@(protected)
>
>

Unable to load bean: type:com.opensymphony.xwork2.util.ValueStackFactory
class:com.opensymphony.xwork2.ognl.OgnlValueStackFactory - bean -
jar:file:/Users/saeediqbal/.m2/repository/org/apache/struts/struts2-core/2.1.6/struts2-core-2.1.6.jar!/struts-default.xml:68:140


Caused by: java.lang.IncompatibleClassChangeError: Implementing class

--
Saeed Iqbal
Independant Consultant
J2EE - Application Architect / Developer

Excluding some jars moved me forward. Now i get this

Caused by: java.lang.ClassCastException:
com.iqbalconsulting.work.servlets.LsoLoginServlet
  at
com.google.inject.struts2.GuiceObjectFactory.setModule (GuiceObjectFactory.java:63)


On Fri, Jan 8, 2010 at 7:59 AM, Saeed Iqbal <saeedcs@(protected):

> Unable to load bean: type:com.opensymphony.xwork2.util.ValueStackFactory
> class:com.opensymphony.xwork2.ognl.OgnlValueStackFactory - bean -
> jar:file:/Users/saeediqbal/.m2/repository/org/apache/struts/struts2-core/2.1.6/struts2-core-2.1.6.jar!/struts-default.xml:68:140
>
>
> Caused by: java.lang.IncompatibleClassChangeError: Implementing class
>
> --
> Saeed Iqbal
> Independant Consultant
> J2EE - Application Architect / Developer
>
>


--
Saeed Iqbal
Independant Consultant
J2EE - Application Architect / Developer