Invoking BC4J custom methods from a JSP

I developed a JSP application using exclusively BC4J Data tags, but now I have a problem.
I wrote a custom method in the .java file of the Application Module of my BC4J project and I should invoke it from a JSP.
I looked for a specific BC4J Data tag to do it, but I couldn't find it.
How can I do? Should I write a bean to encapsulate the call and use the bean in the JSP?
Is anyone else having the same problem?
Michele De Santis
null

Michele,
You would use a scriptlet tag to call the application method. The tag is found in the JSP element wizard under the JSP Tags node. You can also check http://java.sun.com/products/jsp/tags/tags.html for more information on the standard jsp tags.

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Message was edited by:
sfz1
Message was edited by:
sfz1

I am new to servlets/jsp so excuse if I am doing something silly here:
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import javax.servlet.ServletException;
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Message was edited by:
sfz1
Message was edited by:
sfz1

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          public Object[] getControls()
               return new Object[0];
          public Object getControl(String name)
               return null;
below is the servlet code.
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
public class ShowMovie extends HttpServlet {
String rootURL="http://127.0.0.1:8080/Video/";
public void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
     //String movie=request.getParameter("movie");
     String movie ="son";
     getStart(movie);
          response.sendRedirect(rootURL+"View.jsp");
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
     public void getStart(String url){
          new vid2jpg(url);
this is the error from the server. Im using tomkat 5
exception
javax.servlet.ServletException: Servlet execution threw an exception
root cause
java.lang.NoClassDefFoundError: javax/media/ControllerListener
     java.lang.ClassLoader.defineClass1(Native Method)
     java.lang.ClassLoader.defineClass(Unknown Source)
     java.security.SecureClassLoader.defineClass(Unknown Source)
     org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1812)
     org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:866)
     org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1319)
     org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1198)
     java.lang.ClassLoader.loadClassInternal(Unknown Source)
     ShowMovie.getStart(ShowMovie.java:31)
     ShowMovie.processRequest(ShowMovie.java:14)
     ShowMovie.doGet(ShowMovie.java:22)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
note The full stack trace of the root cause is available in the Apache Tomcat/5.5.17 logs.

Calling an ejbLoad method from a JSP

Hi,
I am creating an auction web site. To handle a user adding items for an auction I am using BMP Entity beans. I have successfully created an entity bean to add an item to my database.
However my problem is retrieving this information back form the database. I believe this is achieved by calling the ejbFindByPrimaryKey(Integer ID) method .
I am not using a value object to represent my getter and setter methods, but do I need to?
When a user registers i have the following code in my JSP to create the entity bean...
Context initCTX = new InitialContext();
Object obj = initCTX.lookup("RemoteInterface");
TestAuctionHome home = (TestAuctionHome)javax.rmi.PortableRemoteObject.narrow(obj ,TestAuctionHome.class);
TestAuction TestAuctionBean = home.create(name, description, quantity); This works fine. The bean is created and stored and all results are written to the database.
In a seperate JSP for viewing all available auctions should I call the ejbLoad() method or the ejbFindByPrimaryKeyI was thinking something along the lines of this...
Context initCTX = new InitialContext();
Object obj = initCTX.lookup("RemoteInterface");
TestAuctionHome home = (TestAuctionHome)javax.rmi.PortableRemoteObject.narrow(obj ,TestAuctionHome.class);
TestAuction TestAuctionBean = home.findByPrimaryKey(primaryKey);Any help is appreciated as once I can retrieve data from the database I should be able to fly through the rest!

Hi,
If the only intention is to load all the auctions available in the database and display it to the user, I would suggest not to use either of these methods.
Reason
If you are using ejbFindByPrimaryKey, then many beans should be loaded to memory before any data retrieval. ie if the user has 10 auctions, then 10 entity beans should be called seperatly and ejbLoad of these beans should be called. this will involve atleast 10 extra network connections to the database. this is ofcourse costly.
Instead, you can write a session facade and directly open a connection to the database and fetch the results. This results can be populated to the Value Objects and sent back to the client, where he can format and display all the auctions available to the user.
If your intention is only to show a particular auction only, findByPrimaryKey is fine. And ofcourse after this method call and before an method invocation on the bean , the container will automatically call the ejbLoad.

How to call a class method from a jsp page?

Hi all,
i would like to create a basic jsp page in jdev 1013 that contains a button and a text field. When clicking the button, i would like to call a method that returns a string into the text field.
The class could be something like this:
public class Class1 {
public String getResult() {
return "Hello World";
How do i go about this?
Thanks

Here is a sample:
HTML><HEAD><TITLE>Test JDBC for Oracle Support</TITLE></HEAD><BODY>
<%@ page import="java.sql.*, oracle.jdbc.*, oracle.jdbc.pool.OracleDataSource" %>
<% if (request.getParameter("user")==null) { %>
<FORM method="post" action="testjdbc.jsp">
<H1>Enter connection Parameters</H1>
<H5>Please enter host name:</H5><INPUT TYPE="text" name="hostname" value="localhost" />
<H5>Please enter port number:</H5><INPUT TYPE="text" name="port" value="1521" />
<H5>Service nanme:</H5><INPUT TYPE="text" name="service" value="XE" />
<H5>Please enter username: </H5><INPUT TYPE="text" name="user" />
<H5>Please enter password</H5><INPUT TYPE="password" name="password" />
<INPUT TYPE="submit" />
</FORM>
<% } else { %>
<%
String hostName = request.getParameter("hostname");
String portNumber = request.getParameter("port");
String service = request.getParameter("service");
String user = request.getParameter("user");
String password = request.getParameter("password");
String url = "jdbc:oracle:thin:" + user + "/" + password + "@//" + hostName + ":" + portNumber + "/" + service;
try {
OracleDataSource ods = new OracleDataSource();
ods.setURL(url);
Connection conn = ods.getConnection();
// Create Oracle DatabaseMetaData object
DatabaseMetaData meta = conn.getMetaData();
// gets driver information
out.println("<TABLE>");
out.println("<TR><TD>");
out.println("<B>JDBC Driver version</B>");
out.println("</TD>");
out.println("<TD>");
out.println(meta.getDriverVersion());
out.println("</TD>");
out.println("</TR>");
out.println("<TR><TD>");
out.println("<B>JDBC Driver Name</B>");
out.println("</TD>");
out.println("<TD>");
out.println(meta.getDriverName());
out.println("</TD>");
out.println("</TR>");
out.println("<TR><TD>");
out.println("<B>JDBC URL</B>");
out.println("</TD>");
out.println("<TD>");
out.println(meta.getURL());
out.println("</TD>");
out.println("<TABLE>");
conn.close();
} catch (Exception e) {e.printStackTrace(); }
%>
<%-- end else if --%>
<% } %>
</BODY>
</HTML>

Using arguments to invoke an excel method from PL/SQL with Oracle COM

Hello Gentlemen,
I has been trying to export an excel sheet to a PDF file format using “ExportAsFixedFormat” method, with no success or error message.
Moreover, I tried to use “PrintOut” method, if I use it with no parameters/arguments it executed without errors and display the sheet to an application installed in my PC (“SnagIt”), if I try to use it with an argument to assign a printer for it, I got this error message “PrintOut method of Workbook class failed xlmain11.chm”.
I believe I have a problem with using arguments, and I don’t know how to use it in a proper way; the code I used is listed below for your review and your kind help, thank you a lot, and I appreciate so much your helpful feedback.
Best regards,
Nabil
List 01 – using “ExportAsFixedFormat” method
==============================
ORDCOM.InitArg();
ORDCOM.SetArg('xlTypePDF','XlFixedFormatType');
ORDCOM.SetArg('E:\ TestDelete.pdf','BSTR');
ORDCOM.SetArg('xlQualityStandard','BSTR');
ORDCOM.SetArg('True','BOOL');
ORDCOM.SetArg('False','BOOL');
ORDCOM.SetArg('True','BOOL');
dbms_output.put_line('WorkSheetToken................WorkBookToken........'||WorkBookToken);
i := ORDCOM.Invoke(WorkBookToken, 'ExportAsFixedFormat', 6, DummyToken);
List 02 – using “PrintOut” method:
======================
ActivePrinter := 'Macromedia FlashPaper';
ORDCOM.InitArg();
ORDCOM.SetArg(activeprinter,'BSTR');
i := ORDCOM.Invoke(WorkBookToken, 'PrintOut', 1, DummyToken);

Hello,
Any help please? I believe I have a problem with using arguments, and I don’t know how to use it in a proper way; the code I used is listed above for your review and your kind help, thank you a lot, and I appreciate so much your helpful feedback.
Best regards,
Nabil

Invoking BC4J custom methods from a JSP

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