Expression languages and indexed properties

If I have an indexed property of a JavaBean(TM), can I access it via the expression language? For example,
class MyBean
public X getFoo(int n) { . . . }
public void setFoo(int n, X x) { . . . }
It seems logical that
mybean.foo[0]
should call myBean.getFoo(0)
But the PRD2 spec (5.1.2.1, 5.1.2.2) seems to say no. Is that intentional?

The EL in JSTL 1.0 and JSP 2.0 doesn't support indexed properties. What you can do instead (if you're the one developing the bean) is this:
class MyBean {
public X[] getFoos() { . . . }
public void setFoo(int n, X x) { . . . }
}Now you can access an element of "foos" with ${mybean.foos[0]}

Similar Messages

OIM 11gR2 - Expression Language and Roles

I assume this question is pretty easy for all you developers out there.
I have already found in the forums the answer if you want to hide the Administration tab on the left hand side of the screen from everyone other than the system administrators:
Set the visible property EL to either
#{oimcontext.currentUser.roles['SYSTEM ADMINISTRATORS'] != null}
or
#{oimcontext.currentUser.adminRoles['OrclOIMSystemAdministrator'] != null}
But what would my EL be if I wanted three different roles to be allowed to see it?
EG:
#{oimcontext.currentUser.adminRoles['OrclOIMSystemAdministrator'] != null}
#{oimcontext.currentUser.adminRoles['OrclOIMUserHelpDesk'] != null}
#{oimcontext.currentUser.adminRoles['OrclOIMUserAdmin'] != null}
None of the combinations I'm attempting work to either don't return True or a valid expression.
Any help with the formatting or logic of the string would be very much appreciated.

have you tried like this:
#{ (oimcontext.currentUser.adminRoles['OrclOIMSystemAdministrator'] != null) || (oimcontext.currentUser.adminRoles['OrclOIMUserHelpDesk'] != null) || (oimcontext.currentUser.adminRoles['OrclOIMUserAdmin'] != null) }

Text/expression-language-based paradigma continues?

i've been working with jsp and struts for a while. the most significant drawback of jsp, custom tags/jstl and struts is its "runtime" binding caused by the heavy use of string-attributes and interpreted expressions.
it makes the coding itself harder (loss of compiler support and strong typing), it increases the amount of testing (automated tests, regression tests) extremely, it makes jsp-apps very hard to mantain, it is error-prone when changed or refactored, it is slower in execution and last but not james requires extra developement tools (such as struts-editors) to effectively maintain the applications.
but i like the paradigma of a web application that keeps a view state, handles "events" etc.
the only thing i can't understand is why jsf builds on the error-prone jsp/custom tag paradigma instead of compiled server side ui components. it obviuosly still tries to follow the myth, that web-designers and application developers can share their source (i.e. js-pages) by using tags. imo this is a degeneration of the good idea to leverage html by some custom tags. these tags empower designers to make their pages dynamic. (enterprise) software developement ist very different: complex use cases, business logic and often ui-"logic", integration issues etc...
the life cycle of a jsp with custom tags is weird (even more in struts):
- objects (variables in scriptlets) already existing in the scope of the jsp-execute-method are wrapped into attributes of page, request or application scope.
- tags are defined using string-based attributs, such as <html:write name="pinky" property="brain" />
- the implementation of the tag tries to look up the object in any of the scopes, starting with page scope
- if the object exists, it tries to read/set its property via reflection
so you lose strong typing, compile time checks and performance.
there are several frameworks that do not build upon jsp and tags but put in an extra layer. this layer is similar to a rich client "form" and renders the output into html or any other format.
so i'm not preferring any framework, just looking around and curious why this architecture has been chosen for jsf.
thanks
tom

the most significant drawback of jsp, custom tags/jstl and struts is its "runtime" binding
caused by the heavy use of string-attributes and interpreted expressions.I second this heartily.
but i like the paradigma of a web application that keeps a view state, handles "events" etc.
the only thing i can't understand is why jsf builds on the error-prone jsp/custom tag
paradigma instead of compiled server side ui components. The JSF - JSP connection is a major problem. More and more developers are starting to express reservations about it, because the two technologies don't play well together. But I think you've hit on an even deeper fundamental flaw in the equation -- the evils of runtime binding. The heavy JSF/JSP reliance on runtime evaluation is a reliability nightmare. Developers choose Java, in part, because of the robustness provided by compile-time checking. We give that up when it comes to JSF/JSP or Struts web applications, and that's an unacceptable state of affairs.
Winer says that "JSF has taken a major step in the right direction with the <managed-bean> and <referenced-bean> configuration elements. These give some hope for development tools to finally provide real code insight (and even error reporting) for EL expressions, because they define both what keys are used in the expression language and what types of objects may be at those keys." However, this will help with only the simplest EL expressions. As soon as an EL expression reaches into nested properties and maps that aren't defined in the config file, we're back to runtime binding and error reporting. The addition of generics to the language with 1.5 might have made it possible to introduce strong EL type checking at page compile time, but Sun's short-sighted type-erasure implementation of generics rules this out permanently.
Look at what Microsoft is doing with ASP.NET. It's not perfect, but the fundamental technology is based on compiled server side ui components. There are places in that framework where you can write expressions aren't evaluated until runtime, but it's certainly not the fundamental basis of the model as it is with JSF/JSP. And the .NET implementation of generics may make it possible to have these dynamic expressions type-checked at page compile time in a future implementation of .NET.
I keep reading comments from the JSF proponents who say things to the effect of "yes, we know JSP doesn't play well with JSF, but JSF allows you to plug in a different rendering technology." Well, we need one, and we need it urgently. ASP.NET has been out for two years now, and was far more polished and useable at its release than JSF is now after a very long development cycle.
Rightly or wrongly, people will judge JSF on the merits of the reference implementation. And I fear that a lot of developers are going to throw up their hands after a taste of the JSF/JSP world and move to .NET.
Stephen Schaub

UIX Arrays in Expression Language

Hi All,
Does anybody know if it is possible to have an array in expressionlanguage?
How for example can you specify a four object array like:
{objectA, objectB, objectC, objectD}Is this possible in expression language and if yes how?
I want to use this for my own EL function, I have specified, that I want to use in a UIX page.
Thanks for any help,
Gideon

Hello,
This is not supported. We'd like to support it, but JSTL doesn't support it yet. I found this thread on the web that you might find interesting.
http://mail-archives.eu.apache.org/mod_mbox/jakarta-taglibs-user/200406.mbox/%[email protected]%3E
Jeanne

Expression Language - Help

I'm a new-comer to the expression language and have found it very hard to get to grips with it! Is there any books or manual that exist out there to help a newby like myself?

Welcome to the club my friend!
I like you was looking everywhere for some additional examples and definitions to bridge the gaps but found nearly nothing out in the real world through Google searches or other IT web forums. Siebel provides very few examples and the documentation reminds me of Windows help in the early nineties (overall not very helpful).
Since then I've just focused on hacking my way through the darkness and just keep trying, sooner or later you'll start to get the hang of the expression language.
Although I am tempted to write the 1st CRM expressions book as it couldn't hurt since there is really nothing else available unless you want to pay the $5K to go through the advanced reporting class. The only reason I haven't gone to that is I suspect nobody over there knows how to really use the language either, otherwise they'd have better documentation.
Let me know if you have any specific questions, maybe I can help.
Dan DeHaven (Desperately Trying to Learn)

JSP/Expression Language in Web AS 6.40

Hello
We are trying to port a Servlet/JSP Application from Tomcat to SAP Web AS. It's based on Spring/Hibernate and we are heavily using JSP with Expression Language and JSTL.
The first problem i had with the "c:forEach" tag, was solved by using the "core" taglib instead of the "core_el" taglib (which means JSTL without Expression Language seems to work)
As i found out SAP Web AS 6.40 complies to the J2EE 1.3 Standard. Therefore it supports JSP 1.2 and not JSP 2.0 with Expression Language EL.
Despite not supporting the current JSP Standard, is there any possibility to get JSP Pages with Expression Language running on Web AS 6.40?
If no, is it planned to support JSP 2.0 in future versions of Web AS and when is it scheduled?
Thanks for answers
Sigmar

Sigmar,
there is already released light version of J2EE engine including J2EE1.4...You can have a look at the begin page of the SDN, or directly download it by link :
https://www.sdn.sap.com/irj/sdn/downloaditem?rid=/webcontent/uuid/64919927-0b01-0010-e9bf-d1570518023d [original link is broken]
As bonus it includes Java EE 5 preview
Regards
Bojidar

Batch process for setting document (language) and page (structure) properties

I'm looking for a batch process or script that will take a folder of PDFs and add some basic properties required by Section 508 (for accessibility) automagically--such as Document Properties where language=EnglishUS, and Page Properties Tab Order=Use Document Structure.
I'm not a programmer so any help is very much appreciated.
Thank you!
Mary

well on unix/Linux/solaris there are no drives but storage heirarchy starts with a root directory represented with ' / '. and all files and directories are created in root directoy like
/usr/local/bin
/export/home/san
etc
also filesystem of unix consists iNodes rathar than FAT entries as in case of Windows.
some basic information is available at
http://www.techonthenet.com/unix/index.php
Regards

Multiple language data in the same table and indexes

We have 8.1.5 database with
NLS_LANGUAGE=ENGLISH and NLS_TERRITORY=UNITED KINGDOM set at the database level. We also set the NLS_LANG appropriately when we index the data. We also use the preference setting BASE_LETTER=YES when indexing.
Our tables contain book titles which is what we index using interMedia. Being an online book store, this table may contain titles in English (most of the titles are in English being UK) and some titles in French. Please note the French language has accents and diacritics. Normally in a French database with NLS parameters set correctly and BASE_LETTER=YES, if we search for a title with accent / diacritic it will return the record correctly and match the rows with or without the accents (e.g. searching for video will return both vidio (not the accent on e) and video). However, with the UK settings the accents are not ignored during indexing and it only returns the records that exactly match the search word (e.g. searching for video returns only video and searching for vidio returns only vidio (note the accents on e in the last two videos)).
Question: Is there any way to appropriately index multiple language specific titles in the same database? If yes, how? Is it possible at all? Suggestions, ideas are welcome.
null

Similar request; if there are several different languages used in a database, but a search word can be typed in by anyone and not necessarily in the default language, I still want to be able to pick up all the records (including text in blobs) in any language where my search word = the equivelant word in the other languages; eg. searching on "tree", the search would bring back a document that contained "l'arbre". I then want to set the default language, and allow the user to select a "search in these languages" option to expand the search from the default "tree" to all languages in the database.
I know about the multi_Lexer but does it extend functionality to this level?

Navigation List and Expression Language

Hi,
I have a navigation list with 3 attributes: id, name, telephone.
I display the name and i want using expression language, based on the selected name value in the navigation list to get the id.
Please note that i have a form that i edit a record and i want to include another view as a navigation list. The id from the navigation list i will pass it using a custom method (dropped as a command button) in my application module to proceed from there on.
How can i do this?
Thanks
Antonis
Message was edited by:
Antonis Antoniou

Sorted out.

New language and region in Email Definition properties lookups

I want to use Russian language in Email Definition, but I don't see it in Email Definition language property.
How can I install it or make to appear in properties lookup - Russian language and Russia region?
screenshot:
http://img827.imageshack.us/img827/388/newlang.png

I found out myself.
There are two lookups: "Global.Lookup.Language" and "Global.Lookup.Region". Simply I had to add necessary values "ru" and "RU".

Expression Language - Beyond binding (mini-tutorial)

Expression Language - Beyond binding (mini-tutorial)
Creator has a binding logic that is very easy to use. You right click on a component and choose which properties to bind onto your backing beans. Then you manipulate the backing bean property to change the bound property of your component. Or users input information into your app and the component writes through that input to your backing bean. It's cool.
But sometimes you find yourself binding things to other things and you wonder if this is the simplest way to do things. A classic example is the old "how do I highlight a row of this table based on some datafield?" question. This has been answered by Tor Norbyte and the method works but to me it looks a little disjointed and clumsy.
The classic solution involves binding your tableColumn's style property to a String type bean. Then inside the bean you write the logic that selectively returns a "background-color:'yellow'" string or something similar (Tor used css). The problem is that within the bean you still need to figure out what is the current row of your table. To do this you need to invoke and EL expression from the Java code which, if you were trying to avoid EL, is circular logic. Worse still, imagine you want to color columns separately.
Here's an alternative solution using only Expression Language. It's self contained, easy to debug and maintain and once you've taken a look at it is pretty simple.
Here's the JSP tag that does this:
<ui:tableColumn binding="#{myHomePage.tableColumn7}"
headerText="Expired" id="tableColumn7"
style="#{currentRow.value['expired']>0?'background-color: red':''}">To make it work I had to manually type the expression in the JSP file. The property editor will work with some EL statements but not all. Sometimes it mangles your EL expression and this can take a bit of debugging. <tip>Use the JSP editor...</tip>
The bit I had to manually type is this:
style="#{currentRow.value['expired']>0?'background-color: red':''}"All it does is check if some field in my TableRowGroup called 'expired' is greater than zero and if so highlight the cell. The construction is #{[condition]?[true value]:[false value]}
You can also mix text and expressions in an EL expression:
<ui:staticText .... text="#{SessionBean1.userName}'s Home Page"/>If "Milo" is logged in he'll see "Milo's Home Page" where I placed this static text component.
Here's an example I've got that's part of a Button tag in my JSP:
visible="#{currentRow.value['d2.ReplacedBy']!=null}"In this case I don't want users pressing the button if the field is null, so I hide it for rows where the field is null.
Bean or EL?
Well strictly speaking it's not either or! In order for a Bean to be bound to a component you need an EL expression! So the question is do you implement you logic in a bean or an EL? Well that's pretty easy -- if the logic is simple and can be expressed in one line then use an EL only. Advantages: less dependencies and Bean properties floating around. If the logic is more complex use a backing bean and simple binding.
More to explore
Tor's blog entry:
http://blogs.sun.com/roller/page/tor/20050113#creator_how_to_highlight_specific
Winston's Blog entry
http://blogs.sun.com/roller/page/winston?entry=setting_table_column_style
[How do I add row numbers to a table?]
http://forum.sun.com/jive/thread.jspa?threadID=112916&tstart=0
[How do I use EL to bind to an Object's public property or field?]
http://forum.sun.com/jive/thread.jspa?threadID=112434&tstart=0
Addendum 1-Dec-06 Highlighting every 2nd row in a table
The above thread on how to add row numbers to a table also exposes a pretty simple method to highlight every nth row in a table (a fairly common request)
Something like this should work:
<ui:tableColumn ...... style="#{currentRow.tableRow.rowId%2==1?'background-color: yellow':''}">Message was edited by:
yossarian

Hi Yossarian,
Thanks for posting the simple but elegant solution. I liked the solution.
To make it work I had to manually type the expression in the JSP file.
The property editor will work with some EL statements but not all.
Sometimes it mangles your EL expression and this can take a bit of
debugging.Please file a bug against this at
http://www.netbeans.org./community/issues.html
Use visualweb as the sub category.
Thanks
- Winston
http://blogs.sun.com/winston

When I open logic express 8 with eyetv open but not active and i close logic express 8 and make eyetv active it won't show closed captioning even though closed captioning is turned on

when I open logic express 8 with eyetv open but not active and i close logic express 8 and make eyetv active eyetv won't show closed captioning even though closed captioning is turned on. When I totally close eyetv and reopen eyetv and open a live tv window the closed captioning comes back. I never noticed this with os leopard, Just after i installed os snow leopard. All software is up to date only I think, thanks to apple they droped support for logic express. Thanks for any suggestions.

Does toggling CC off & back on bring it back?
"Try Disk Utility
1. Insert the Mac OS X Install disc, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu at top of the screen. (In Mac OS X 10.4 or later, you must select your language first.)
*Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.*
3. Click the First Aid tab.
4. Select your Mac OS X volume.
5. Click Repair Disk, (not Repair Permissions). Disk Utility checks and repairs the disk."
http://docs.info.apple.com/article.html?artnum=106214
Then try a Safe Boot, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, reboot when it completes.
(Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive.)
If perchance you can't find your install Disc, at least try it from the Safe Boot part onward.

Help needed in JSP Expression Language

Hi all,
I have been working for JSP Expression Language Sample execution since past 5 days. I am using the application server as "Jboss Server" and web server as "Tomcat".
I have been included the jsp-api.jar file in my lib directory of application server as well as source folder's lib directory.
When i am trying to build the source code, i am getting this build error.
[javac] D:\eclipse\workspace\esolvProject\development\src\com\esolv\taglibs\
web\classes\SetSupport.java:186: cannot resolve symbol
[javac] symbol : method getExpressionEvaluator ()
[javac] location: class javax.servlet.jsp.PageContext
[javac] ExpressionEvaluator evaluator = pageContext.getExpressionEvaluator();
In my jsp-api.jar , there are two classes called,
PageContext and JspContext, Both are abstract classes.
PageContext inherits JspContext class. JspContext class have the method getExpressionEvaluator() , returns ExpressionEvaluator.
PageContextImpl - class . it has been called internally when we are trying to call PageContext class. In PageContextImpl class, there is one comment before, the method's definition. that is
" Since JSP 2.0 "
But we have the JSP 2.0 version. But it won't work.
Please help me ont this.
Thanks in Advance,
Natraj

>
If the pblm was due to setting the classpath.
The error should be showed for all files in the jar
file.
why i am getting the error for particular method ?
it is accessing the other methods of same class
'JspContext' . but it is not accessing that method.
Thats my question.
Just check that your .jar file is 2.0 compliant and that you do not have any other jars(for servlet or jsp api) in the classpath.
Probably you have an older version of .jar file in your path. So the errors will appear only for those methods that have been added since 2.0, all other methods would compile fine.
Please tell me the jar files to work out the
expression language. so that i can cross check my
list of jars.Hmmm...I dont use jboss. In tomcat the jar file name is jsp-api.jar. But it would have been the same even for jsp1.1, going by jar file names wouldnt help. Just look at your cp as if with a microscope to identify redundant jars.
cheers,
ram.

I am trying to configure my SCXI-1540 card for excitation voltage and frequency using MAX - but it is not giving me that option when I click on the card and then properties, am I looking in the wrong place?

I am trying to configure my SCXI-1540 w/1315 card for excitation voltage and frequency using MAX - but it is not giving me that option when I click on the card and then properties, am I looking in the wrong place?
I have LabVIEW Express 7.0 Professional - SCXI-1000 Chassiss - along with SCXI-1112, and SCXI 1520/1314 - cable to the PCI-6052E is attached to the 1520 card.
MAX says it recognizes all the cards in the chassiss.

Jeremy, Thanks for the reply.
I tried to set up the system as DAQmx.
I had MAX auto-detect the set-up - and it recognized all the cards - but did not select the 1315 accessory on the 1540 card - I had to do that manually - but in the configuration section I would select the accessory and it would deselect itself. I had to get out of the set-up and then right click on the 1540 card and click on the "Accessories" tab and select the 1315 terminal block that way.
It didn't seem right that the system should behave that way, but I pressed onward.
I then tried to create a new DAQmx Task
When I create new DAQmx task and then click on Analog Input no "Position" Tab appears for me to select, all I get are:
Analog>>Voltage
Analog>>Temperature
Ana
log>>Strain
Analog>>Current
Analog>>Resistance
Analog>>Frequency
Analog>>Custom Voltage with Excitation
Do you think there might be something wrong with either my hardware or perhaps my configuration that is not allowing it to recognize the 1540/1315 in DAQmx?
I had included the system report of what programs I am using, etc. as attached file nireport.txt
After the DAQmx did not work I tried installing everything as Traditional DAQ and it did let me set-up the 1540 Card with Excitation Voltage and Frequency and gain - I then went in to the VI that I had built and tried to use the Express DAQ Assisant to read the channel that I am connected to on the 1315/1540 - when I try to use DAQ Assistant it gives me an error saying that "Device not available in NI-DAQmx. It is possible that the device is being use by traditional NI-DAQ"
Which I guess it is since both configurations are now set-up in MAX.
I would PREFER to use the DAQmx set-up, but I am confused as to WHY it won
't come up with
Analog input>>POSITION>>LVDT
When I try to create a new DAQmx task.
Thanks for the help so far! As you can probably tell I am new at this.
Ryan
Attachments:
nireport.txt ‏2 KB

{Expression Language} not working tomcat5 j2se 1.5_beta

I m new to JSP technology. I m trying to use expression language in my application and it's not letting me do the job.
simple program
<head> <body>
Hi there! 3 + 3 is ${3+3}
</body></head>
It just shows " Hi there! 3 + 3 is ${3+3} " as the output. I tried google search. it seems the problem is across many networks like in bea weblogic etc.,
when i used <%@page isELEnabled="true" > i get an error saying attribute isELEnabled not recognised or something like that. My web.xml hasn't got any setting for jsp so I don't know where the "*.jsp" section is available, just in case that needs any touchup.
I have installed JSTL under /common/lib dir. but i think this library is not required for using basic EL.
So, can anyone help me configure my JSP page so that i can use EL tags in them.
OS: Windows 2000
Tomcat ver: 5
J2Se: 1.5 beta

Hmmm. Looks like I didn't make myself clear enough.
You still have the declaration DTD for servlet 2.3 at the top of your web.xml.
To enable EL using Tomcat 5 you only need to do ONE of the following:
1 - update your web.xml file to have the header for the 2.4 version (note its not a DTD anymore)
2 - if your web.xml uses the DTD from version 2.3, include the page directive <%@ page isELIgnored="false" %> on any pages
Basically the rules for executing EL are as follows:
1 - Is there a directive on the page? If yes, then enable/disable according to the directive.
2 - Is there an entry in web.xml for handling EL? If yes then enable/disable according to the setting
3 - Is the web.xml file for the Servlet 2.4 spec? (ie does it start have the version 2.4 header) Yes = enable EL No = disable EL
The easiest way of enabling EL is updating your web.xml to be compliant with the latest servlet spec.
Cheers,
evnafets

Expression languages and indexed properties

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