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.
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<o:Author_Creation_Information o:Author="O221" o:Time="2004-04-23T12:53:29+05:30" />
<o:Author_Modification_Information o:Author="O221" o:Time="2004-04-23T12:53:50+05:30" />
<o:Contained_in_Folders o:Title="O172" />
</o:Problem>
</o:Folder>
</aob:AOB-XML> -
?? Invalid Cursor State - Help needed in JSP.
OK...here's the problem I have a page that loads the values from a database into input fields so as users could edit and update the data into the respective tables.
But the problem is i get this error which I have never come accross before. So any help clarifying this would be much appreciated.
The stack trace :
500 Internal Server Error
java.sql.SQLException: [Microsoft][ODBC Driver Manager] Invalid cursor state
at sun.jdbc.odbc.JdbcOdbc.createSQLException(JdbcOdbc.java:6106)
at sun.jdbc.odbc.JdbcOdbc.standardError(JdbcOdbc.java:6263)
at sun.jdbc.odbc.JdbcOdbc.SQLGetDataString(JdbcOdbc.java:3307)
at sun.jdbc.odbc.JdbcOdbcResultSet.getDataString(JdbcOdbcResultSet.java:5492)
at sun.jdbc.odbc.JdbcOdbcResultSet.getString(JdbcOdbcResultSet.java:342)
at sun.jdbc.odbc.JdbcOdbcResultSet.getString(JdbcOdbcResultSet.java:399)
at /abb/jspages/editCosting.jsp._jspService(/abb/jspages/editCosting.jsp.java:40) (JSP page line 13)
at com.orionserver[Orion/2.0.2 (build 11157)].http.OrionHttpJspPage.service(.:70)
at com.evermind[Orion/2.0.2 (build 11157)]._ay._rkb(.:5741)
at com.evermind[Orion/2.0.2 (build 11157)].server.http.JSPServlet.service(.:31)
at com.evermind[Orion/2.0.2 (build 11157)]._cub._pod(.:521)
at com.evermind[Orion/2.0.2 (build 11157)]._cub._bmc(.:177)
at com.evermind[Orion/2.0.2 (build 11157)]._ax._ltc(.:666)
at com.evermind[Orion/2.0.2 (build 11157)]._ax._uab(.:191)
at com.evermind[Orion/2.0.2 (build 11157)]._bf.run(.:62)By the way I am using Microsoft Access as the DB and Orion Server 2.0.2.sorry guys...It was me who's the stupid one gocha. Actually there error was caused by a typo i made in the rs.next codings.
Since i just copied it from another well functioning coding i didn't check for typos in the coding. Maybe i accidentally pressed something on the keyboard.
Thanks for the help guys..I really appreciate it. -
Developing and Using Functions
iam new to use the jsp ..
iam learning how to use taglib.
user defined functions
tell me steps to write user defined function using taglib
iam trying run the Code sample 3
in the given url..
http://java.sun.com/developer/technicalArticles/javaserverpages/JSP20/Read this: http://java.sun.com/products/jsp/tutorial/TagLibrariesTOC.html
=======================================================
To use these tags, you need to have 4 files:
1. Your .java file with the function ( the add() method in your case )
2. A .tld file, the taglib descriptor, to hold the 'function descriptor' as you call it. This maps the tag to the Java method
3. The web.xml, it has to have entries that tell the container ( Tomcat? ) where to find the TLD for a particular URI (http://jakarta.apache.org/tomcat/jsp2-example-taglib in your case )
4. The JSP page with the taglib directive as you've already made.
=======================================================
How it works is:
1. the JSP page taglib directive tells the container that the prefix 'my' will refer to the taglib identified by the URI "http://jakarta.apache.org/tomcat/jsp2-example-taglib".
2. The container must now know which tag library is being referred to. The container, during startup, tracks all the entries in the web.xml and maps the URI with the location ( taglib-uri and taglib-location ).
3. The location points to your Java class: one.Compute
=======================================================
My doubt:
1)where i have to place the function descriptorThis is to be part of a .tld file, the taglib descriptor. Let's assume you save this TLD as myTaglib.tld and place it in /WEB-INF. Your entry will be like this:
<taglib xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
web-jsptaglibrary_2_0.xsd"
version="2.0">
<tlib-version>1.0</tlib-version>
<function>
<description>add x and y</description>
<name>add</name>
<function-class>jsp2.examples.el.Compute
</function-class>
<function-signature>int
add(java.lang.String,java.lang.String)
</function-signature>
</function>
</taglib>------------------------------------------------------------------------------------------------
2)<%@ taglib prefix="my"
ri="http://jakarta.apache.org/tomcat/jsp2-example-tagl
ib %>in the url just i have to mention that url else
anything i have to edit it.This is fine, as long as the URI value matches the taglib-uri element in your web.xml
You web.xml should have an entry :
<taglib>
<taglib-uri>
http://jakarta.apache.org/tomcat/jsp2-example-taglib
</taglib-uri>
<taglib-location>
/WEB-INF/myTaglib.tld
</taglib-location>
</taglib>
3)i had placed the compute .java program inside
package one is it necessary to place that program
in separate package else i can place it along other
java files.
) is i have to include any jar or TLD files in my
project ..All your loose classes ( .class files ) go into /WEB-INF/classes. They should be in folders representing the package heirarchy. So in your case, you've not declared the package in the code given. So I'm assuming you have
package one; in your .java file.
So your class should go into /WEB-INF/classes/one/Compute.class
All JARred classes ( in the form of .jar archives ) should be put into the /WEB-INF/lib folder.
The post is a bit messy but I think I've managed to get the basics right :) -
Help Needed in Application Express
Hi Experts ,
We recently installed APEX , we want to allow users to create applications, as I am new to this I got these doubts :
1.How we can migrate developed applications to production? Is there a way to turn this migration over to Production Control?
2.How we can limit the size of the tables that users create? ( Because we got some big tables with 3 billion records , so we dont want the users to create big tables from the base tables )
3.Do the results of their reports get saved?If so,do we have control over that? (size, length of time saved )
Please help me in this regards...
Thanks
Venu KadiyalaHi Venu,
<p>
1.> You have to export the application in development and import it back in production. Every time it will ask for application ID, you can use the exiting application ID as of dev, or assign a new ID or replace an exiting application in production. I would recommend use auto assign a new ID for the first time migration and then onwards choose the third option and provide existing ID so that production URL would remain same.
<p>
For exporting follow the path
<p>
<b> Home>Application Builder>Application #>Export / Import>Export</b>
<p>2.> I don’t think you can limit the size of a table directly, but you can write PL-SQL blocks and display appropriate message to the users.
<p>
3.> Reports don't get saved. You can have the functionality where you can download the reports in excel or print PDF.
Regards,
Manish
Message was edited by:
Manish Jha -
Help needed with an AIR language packaging problem
I have a game that includes resources for the Hebrew language, however the <supportedLanguages/> tag supports only ISO 639-1 languages, and Hebrew is not listed; in fact I got a compiler/packaging error when I tried to use "he". Currently I am getting a notice in Google play that warns me this game might not be packaged correctly: "You translated the store listing into Hebrew but not the APK." Is there a way around this problem, perhaps some manual editing of some files somewhere? I'd like to publish the same app to the Apple app store, I imagine they will be even less lenient there.
We are using Flash Builder 4.7 and AIR 3.7 on Windows 7 x64 SP1. Any assistance would be appreciated.It can be done for iOS. Check here: http://forums.adobe.com/message/5140906
Don't know about Android. -
Hi,
I have a variable declared in one of the JSP files. How can I access that variable from another JSP page?
For ex:
jsp1.jsp
<%
String hello = "Hello world!";
%>
jsp2.jsp
<h3>The string is <%= hello %></h3>
I know this code wont work. But how can I fix it?
Please let me know your solutions as soon as possible.
Thank you,
RajeshThanx a lot.
I did understand how to use session to store a java object. Actually, I wanted to use primitive data types... well, I could work around that.
But, could you please explain what you mean by storing in the application context?
Thanks a lot,
Rajesh -
Help needed in JSP application
Hi... I am implementing one web application. The main file is index.html whch contain frame where following options are there.
1. Login 2. Line Count. 3. Leave Balance 4. Extra. 5. Log out. but wht I want is, Once User logged in the options from 2to 5 must be visible..But first time only login option should be available..
Hope you understand...and please tell me how can i do it
Wether I have to create 2 page..one for login and another for rest of the options or some other way to do so??
Thanks inadvance
Regards
ChintanThere is a general feeling that scriptlets in JSP pages are a bad thing.
They can make the page difficult to follow and understand.
The syntax used above was from the JSTL - JSP Standard Template Library : http://java.sun.com/products/jsp/jstl/
The JSTL tags provide a lot of functionality that previously was done in scriptlets.
eg Looping, conditional branching, formatting, XML handling.
Benefits: You don't have to constantly switch between java and html with <% %> tags. The code ends up looking much nicer.
Also it is aimed at page authors, who don't necessarily understand java, but will understand using tags like this.
Myself, I like it because of the first reason - it just makes the page so much easier to read when everything is in tags, as opposed to constantly switching from java to html and back - particularly with braces.
You have to agree:
<c:if test="${params.choice == 'yes'}">
You said YES!
</c:if>looks much better than
<% if (request.getParameter("choice").equals("yes")){ %>
You said YES!
<% } %>Cheers,
evnafets
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