Recurison with custom tags

Is Binary tree traversal possibe using custom tags?. The scriptiong variable need to be set in the JSP page on traversal of each node. Any suggestions will be appreciated.
thanks
sprasad

thanks for suggestion.but the issue here is not actually traversing the binary tree(which is major focus in XML). It would be possible to do that using recursive method in tag. But the problem is that how to assign them to the scripting variables in the JSP.
While using the recursion , how to set the variables in the bodycontent.

Similar Messages

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    Hi,
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    My tag looks like this:
    <tt:cs sel="ab" ce="<%= java.util.ResourceBundle.getBundle("de", Application.getApp().getLocale())%>" />
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    Thanks a lot!
    Regards Patrick

    In JSP 1.2, in the Tag Library Descriptor, you can specify a tagt attribute as
    <attribute>
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       <required>true|false|yes|no</required>
       <rtexprvalue>true|false|yes|no</rtexprvalue>
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  • Exception Handling with Custom Tags/Exceptions

    Hello all --
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              many thanks in advance!
              s.
              

    I could not tell what the problem was that you were describing. Could you
              clarify?
              Cameron Purdy
              [email protected]
              http://www.tangosol.com
              WebLogic Consulting Available
              "Shari" <[email protected]> wrote in message
              news:[email protected]...
              > Hello all --
              >
              > I'm looking for some guidance in handling Custom errors in my app. I can't
              > seem to find the message string of my custom exception when trying to call
              > my JSP Error page. I'm consistently getting:
              > javax.servlet.jsp.JspTagException: runtime failure in custom tag
              > 'CalendarHandler' .
              >
              > I am using custom JSP tag libraries to process logic on my EJBs. When I
              > reach an error in business logic I raise a custom exception and propogate
              > this back up to doStartTag:
              >
              > public int doStartTag() throws JspException {
              >
              > CalendarProcessor cp = new CalendarProcessor();
              >
              > try {
              >
              > String eventAction = getEventID();
              >
              > // pageContext contains information for the JSP;
              >
              > // Initialize the page with the current context and session
              >
              > cp.init(pageContext.getServletContext(), pageContext.getSession());
              >
              > HttpServletRequest req = (HttpServletRequest)pageContext.getRequest();
              >
              > cp.processRequest(req, eventAction );
              >
              > } catch (CalendarException ce) {
              >
              > throw new JspException(ce.getMessage());
              >
              > }
              >
              > return SKIP_BODY;
              >
              > }
              >
              > Then, in my JSP, I am enclosing the TagHandler in a try...catch block; I
              > can't catch CalendarException because it is Throwable and conflicts with
              > JspException.
              >
              > <% try { %>
              >
              > <gtc:CalendarHandler eventID="updatecal"/>
              >
              > <% } catch (Exception e) {
              >
              > throw e instanceof JspException ? (JspException) e : new
              > JspTagException(e.getMessage());
              >
              > }
              >
              > %>
              >
              > many thanks in advance!
              >
              > s.
              >
              >
              >
              >
              >
              >
              >
              

  • Problem with custom tag

    I have written a custom tag that I am having problems with. It works on some machines, but not on others. I have a page that uses many 'standard' tags. I have correctly set the URI etc, because all of my other tags work. However, on some machines, my custom tag gives me an error:
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    I encountered the same problem in our environment. I did the same thing as
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              in the inner tag if the outer tag keeps references to all the inner tag
              instances.
              For instance if the outer tag kept a vector of references to the inner tag,
              then you would need to use clone() on the inner tag before adding it to the
              vector.
              "James Lynn" <[email protected]> wrote in message
              news:3af05d29$[email protected]..
              > > But
              > > with WL 6.0, the cell tag handler reuse the same instance each time the
              > cell tag
              > > is called and the member field is not reset
              >
              > I had the same problem. As a work around, I reinitialize everything in my
              > doEndTag() method and it works.
              >
              >
              > --
              > James Lynn - Lead Software Architect
              > Oakscape - Java Powered eBusiness Solutions <http://www.oakscape.com/>
              >
              >
              

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    All,
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    Kyle Corley

    Hi,
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    Brian
    JDev Team

  • JSP with Custom tags error during verify.

    Hi, i am new to JSP and Custom tag Library. The tools that i am using to deploy is "Sun Deploy Tool 8.2" with Sun Application Server. When i try to verify my JSP page i get this error message
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    org.apache.jasper.JasperException: Unable to compile class for JSP
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    import javax.servlet.jsp.*;
    import java.text.SimpleDateFormat;
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    <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"
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    <jsp-version>2.0</jsp-version>
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    I am sorry for the double post because the format mess up..Please ignore this POST..Apologies again..Thanks

  • Error while running JSP with custom tag

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  • Problems with custom tags (Tomcat 4.1)

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  • Build-time errors with custom tags in wkshop sp3

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  • Problem with custom tags

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         <bodycontent>empty</bodycontent>
         <info>Saludo</info>
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         <rtexprvalue>false</rtexprvalue>
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         at com.iplanet.server.http.servlet.NSServletRunner.ServiceWebApp(NSServletRunner.java:959)

  • Problem with custom tag using TagExtraInfo

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    I encountered the same problem in our environment. I did the same thing as
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              Also, with the nested tags you use you may also need to implement cloneable
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              instances.
              For instance if the outer tag kept a vector of references to the inner tag,
              then you would need to use clone() on the inner tag before adding it to the
              vector.
              "James Lynn" <[email protected]> wrote in message
              news:3af05d29$[email protected]..
              > > But
              > > with WL 6.0, the cell tag handler reuse the same instance each time the
              > cell tag
              > > is called and the member field is not reset
              >
              > I had the same problem. As a work around, I reinitialize everything in my
              > doEndTag() method and it works.
              >
              >
              > --
              > James Lynn - Lead Software Architect
              > Oakscape - Java Powered eBusiness Solutions <http://www.oakscape.com/>
              >
              >
              

  • Why EL doesn't work with custom tags ?!

    I don't know why expression lang. doesn't work with me.
    here's an example, and please tell me why :
    --- the jsp page with EL ==> doesn't work :
    <%-- In the name of ALLAH most gacious most merciful --%>
    <%@ page language="java" %>
    <%@ taglib uri="/cartlib" prefix="cart" %>
    <html>
    <jsp:useBean id="product" class="ch16.cart.ProductCatalog" scope="application" />
    <cart:showCatalog productCatalog="${product}" addToShoppingCartUri="<%= response.encodeURL("AddToShoppingCart.jsp") %>" />
    </html>
    when using expressions instead, the page works .
    the new page is :
    <%-- In the name of ALLAH most gacious most merciful --%>
    <%@ page language="java" %>
    <%@ taglib uri="/cartlib" prefix="cart" %>
    <html>
    <jsp:useBean id="product" class="ch16.cart.ProductCatalog" scope="application" />
    <cart:showCatalog productCatalog="<%= product %>"
    addToShoppingCartUri="<%=
    response.encodeURL("AddToShoppingCart.jsp") %>" />
    </html>
    The error was :
    HTTP Status 500 -
    type Exception report
    message
    description The server encountered an internal error () that prevented it from fulfilling this request.
    exception
    org.apache.jasper.JasperException: jsp.error.beans.property.conversion
    org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper
    .java:512)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
    root cause
    org.apache.jasper.JasperException: jsp.error.beans.property.conversion
    org.apache.jasper.runtime.JspRuntimeLibrary.getValueFromPropertyEditorManager(Js
    pRuntimeLibrary.java:885)
    org.apache.jsp.ShowProductCatalog_jsp._jspService(ShowProductCatalog_jsp.java:77
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:334)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
    note The full stack trace of the root cause is available in the Apache Tomcat/5.5.20 logs.

    Regarding setup, see this post reply #6
    http://forum.java.sun.com/thread.jspa?threadID=629437&tstart=0
    Other potential things to check: make sure you are getting the right value passed in
    productCatalog="${applicationScope.product}"
    ${product} by preference would take a pageContext, request or session attribute before the application level one (it uses pageContext.findAttribute).
    What do you get if you just print out ${product} on the screen?
    It should call a toString() on it for rendering purposes.

  • Anyone one with 1,000+ JSPs with custom tags?

              We're having some interesting memory problems with Sun JVMs, I'd like to hear how
              your app is working out (misery loves company).
              Mike
              

    What are you seeing?
              What WL version, what JVM, what OS/ver?
              Cameron Purdy
              Tangosol, Inc.
              http://www.tangosol.com
              +1.617.623.5782
              WebLogic Consulting Available
              "Mike Reiche" <[email protected]> wrote in message
              news:3a80feac$[email protected]..
              >
              > We're having some interesting memory problems with Sun JVMs, I'd like to
              hear how
              > your app is working out (misery loves company).
              >
              > Mike
              

  • Problems with Custom Tags

    I get a error message like this:
    root cause
    java.lang.NoClassDefFoundError: javax/servlet/jsp/JspContext
    at java.lang.Class.getDeclaredMethods0(Native Method)
    And I checked that the error looks like to be in the line
    that I try to write something in my Page. This way:
    this.pageContext.getOut().write("hello");
    And I don�t realize what is going on, I've already checked
    out in many places, web, list, etc, about this error, and up
    to now I don't get any clue about what's happening.
    I don't think that there's a problem in the code, because
    the same code was running perfectly in another application
    server.
    Please someone could help me ?
    Thanks in advance!
    Ualter Jr.

    Ok, I've alredy found the cause.
    I'm using Eclipse to build my application, and the Eclipse is pointing to J2EE version 1.4 (that's in my computer) for the compilation of the Servlets and TagHandlers.
    But, I'm using Tomcat 4.1.29, or JBoss 3.2.3 to test the application, and these version aren't compatible with version 1.4 of J2EE, they are compatible with version 1.3
    In J2EE 1.3 there's no class called JspContext just in the J2EE 1.4
    That's all confusion.
    That's was my fault, sorry.

  • Database access with JSP custom tags

    i have created one file in which i am making the connection with mysql data base with con.mysql.jdbc.Driver.and usking J connector and that i'm doing with custom tag.this is the error which i'm getting in tomcat.
    and the tag handler class and TLD file and jsp file is below
    type Exception report
    message
    description The server encountered an internal error () that prevented it from fulfilling this request.
    exception
    javax.servlet.ServletException: javax.servlet.jsp.JspException: null
    org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl .java:841)
    org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.j ava:778)
    org.apache.jsp.DbTry_jsp._jspService(org.apache.jsp.DbTry_jsp:72)
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:99)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:325)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:245)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
    root cause
    java.lang.NullPointerException
    Try.Connect.<init>(Connect.java:26)
    sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
    sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    java.lang.reflect.Constructor.newInstance(Unknown Source)
    java.lang.Class.newInstance0(Unknown Source)
    java.lang.Class.newInstance(Unknown Source)
    org.apache.jasper.runtime.TagHandlerPool.get(TagHandlerPool.java:116)
    org.apache.jsp.DbTry_jsp._jspx_meth_db_connect_0(org.apache.jsp.DbTry_jsp:84)
    org.apache.jsp.DbTry_jsp._jspService(org.apache.jsp.DbTry_jsp:62)
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:99)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:325)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:245)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
    note The full stack trace of the root cause is available in the Apache Tomcat/5.5.4 logs.
    Apache Tomcat/5.5.4
    Tag handler class
    package Try;
    import java.sql.Connection;
    import java.sql.DriverManager;
    import java.sql.SQLException;
    import javax.servlet.jsp.JspException;
    import javax.servlet.jsp.JspWriter;
    import javax.servlet.jsp.PageContext;
    import javax.servlet.jsp.tagext.TagSupport;
    import java.sql.*;
    public class Connect extends TagSupport {
    private String driver = "com.mysql.jdbc.Driver";
    private String dbtype = "mysql";
    private String host = "localhost";
    private String username = "root";
    private String password = "203131";
    private String database = "compose";
    private String scope = "page";
    private String id = "";
    JspWriter out = pageContext.getOut();
    public void setDriver(String str) {
    driver = str;
    public void setDbtype(String str) {
    dbtype = str;
    public void setHost(String str) {
    host = str;
    public void setUsername(String str) {
    username = str;
    public void setPassword(String str) {
    password = str;
    public void setDatabase(String str) {
    database = str;
    public void setScope(String str) {
    scope = str;
    public void setId(String str) {
    id = str;
    public int doStartTag() throws JspException {
    try {
    Class.forName("com.mysql.jdbc.Driver");
    String url= "jdbc:" + dbtype + "://" + host + "/" + database;
    Connection connection = DriverManager.getConnection(url,username,password);
    out.println("right ;;one");
    catch (SQLException e1) {
    System.out.println("Error in HeadingTagv: " + e1);
    catch (Exception e) {
    System.out.println("Error in HeadingTag: " + e);
    return SKIP_BODY;
    TLD is lib.tld
    <?xml version="1.0" encoding="UTF-8" ?>
    <!DOCTYPE taglib
    PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN"
    "http://java.sun.com/j2ee/dtds/web-jsptaglibrary_1_2.dtd">
    <taglib>
    <tlib-version>1.0</tlib-version>
    <jsp-version>1.2</jsp-version>
    <short-name>db</short-name>
    <display-name>Database Tags</display-name>
    <description>
    A set of tags for working with SQL database access
    </description>
    <tag>
    <name>connect</name>
    <tag-class>Try.Connect</tag-class>
    <body-content>empty</body-content>
    <description>
    </description>
    <attribute>
    <name>driver</name>
    <required>false</required>
    <rtexprvalue>true</rtexprvalue>
    <description>
    </description>
    </attribute>
    <attribute>
    <name>dbtype</name>
    <required>false</required>
    <rtexprvalue>true</rtexprvalue>
    <description>
    </description>
    </attribute>
    <attribute>
    <name>host</name>
    <required>false</required>
    <rtexprvalue>true</rtexprvalue>
    <description>
    Can be given by a run-time expression.
    Host name of the computer where database is located.
    Default is "localhost".
    </description>
    </attribute>
    <attribute>
    <name>username</name>
    <required>false</required>
    <rtexprvalue>true</rtexprvalue>
    <description>
    Can be given by a run-time expression.
    Username for logging onto the database.
    Default is "root".
    </description>
    </attribute>
    <attribute>
    <name>password</name>
    <required>false</required>
    <rtexprvalue>true</rtexprvalue>
    <description>
    Can be given by a run-time expression.
    Password for logging onto the database.
    Default is the empty string.
    </description>
    </attribute>
    <attribute>
    <name>database</name>
    <required>false</required>
    <rtexprvalue>true</rtexprvalue>
    <description>
    Can be given by a run-time expression.
    The name of the database that will be used for
    the SQL commands. Default is no database specified.
    </description>
    </attribute>
    <attribute>
    <name>id</name>
    <required>false</required>
    <description>
    </description>
    </attribute>
    <attribute>
    <name>scope</name>
    <required>false</required>
    <description>
    </description>
    </attribute>
    </tag>
    </taglib>
    JSP file is
    <%@ taglib uri="/WEB-INF/lib.tld" prefix="db" %>
    <html>
    <body>
    <db:connect username="root" password="203131" database="compose" />
    </body>
    </html>

    Answered in your other post:
    http://forum.java.sun.com/thread.jspa?threadID=608780&tstart=0

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