Java Class vs Interface

Hi,
I have a question regarding Java class & interface. I know how to use them and the difference between a class and an interface, but I don't know WHEN I shall create an interface instead of a class? Does someone can help me out? Thank you.
Svenson

One reason to use interfaces: Create interfaces when you want to say "Look @ me! I r teh ubar Javanazi. Abstract classes r ghey lolz."
Another reason: If you want to define what a set of classes should do, but not how they should go about doing it.
Another reason: To highlight and emphasize the commonalities between a set of classes (ie, interfaces with purely polymorphic intentions)
Another reason: Humans and monkeys are subsets of Primates. however, there is no one animal named a "Primate," it merely defines a set of behaviors and characteristics. In other words, there is no direct instance of Primate, so it is an interface.

Similar Messages

Global Container in Java Class of Interface Mapping

I have written a Java Class that implements the StreamTransformation interface for use in an Interface Mapping. I would like to cache information read from a file between message processing calls of this mapping.
It appears that maybe the GlobalContainer object can be used to perform this caching. How do I access the GlobalContainer object from a class that implements StreamTransformation?
The examples all show container.getGlobalContainer() method call to get access to this object. However container is not a variable in this interface. Any ideas on how to do this?
Thanks,
Jay

Hi Jay,
if you want to link data from different messages you must use BPM, you cannot do this with GlobalContainer because it is instantiated at the begin of the mapping and is flushed at the end of the mapping (e.g. graphical mapping).
2 files for the same scenario will use 2 different instances of the same message mapping program and they will not share the container.
The container is shared inside the same instance of the mapping program.
So it is shared for example between two UDF in the same mapping
So if you are using Java mapping you do not need to use the global container, you can use an Object to store data, but keep in mind that all this data will be lost at the end of the mapping.
Hope it helps,
Kind Regards,
Sergio

Mapping data model to java classes and Interface.

Need help in mappning my data model into java classes;
Here are some of the details:
Table, Poll:
PollID int
PollName varchar
BusinessUnit varchar
DisplaySchemeID int // reference to DisplayScheme table.
Table, DisplayScheme
DisplaySchemeID
DisplaySchemeName
etc
Table, URL
UrlID
UrlName
UrlDesc
Table, PollURL
PollURLID
PollID
UrlID
PublishDate
etc
Table, Tag
TagID
TagName
PollID
So, a POLL is associate with a DisplayScheme.
A Poll can have many URLs and a URL can be associate with many Polls , mapped in the PollURL table.
and same is the situation with tags.
Essentially I want to learn how to do one to many mappning and many to many mapping.
Also to add, since I plan to use Ibatis for OR mapping.
So I should a Parameter call to map for creaint a Poll. And to create a poll the form submitted will have:
- PollName
- URLs ( multiple )
- one display scheme.
- Tags ( many )
So if you can show how to write a DAO createPoll method, then it would be great.
Not sure if am asking a lot, but this would be a great example to move forward.

The below is the sample DAO Class.
For your case, you have to create your own PollBean with getters and setters and just pass the object to the method
public int create(Connection con, ProjectBean projectBean) throws SQLException {
          int result = 0;
          String insertQuery = " INSERT INTO" +
                    " M_PROJECT(" +
                    " PROJECT_ID," +
                    " PROJECT_NAME," +
                    " PROJECT_DESCRIPTION) " +
                    " VALUES(?,?,?,?)";
          initPrepareStmt(con, insertQuery);
          setString(projectBean.getProjectID());
          setString(projectBean.getProjectName());
          if(projectBean.getProjectDescription().equals("")){
               setString(" ");
          }else{
               setString(projectBean.getProjectDescription());
          result = executeUpdate();
     return result;
     }

Synchronized method in a java class used by many interfaces

My interface (idoc to file) is using a java class, which has one method that reads a table from a central database and after doing some calculations updates it.
(The interface instantiate the class inside a user-defined function and calls the method there.)
The problem is that if somebody sends 100 idocs at the same time, there can be a dirty read, I mean, a read just before other interface updates the table.
We want the following:
Interface 1:
-          Read counter from the table (counter = 5 )
-          Increment counter (counter = 6)
-          Update table with that counter (table with counter = 6)
Interface 2:
-          Read counter from the table (counter = 6 )
-          Increment counter (counter = 7)
-          Update table with that counter (table with counter = 7)
RESULT: The table has the counter = 7
But what is happening is the following:
-          Interface 1 reads (counter = 5)
-          Interface 2 reads (counter = 5)
-          Interface 1 increments counter (counter = 6)
-          Interface 2 increments counter (counter = 6)
-          Interface 1 updates table (table with counter = 6)
-          Interface 2 updates table (table with counter = 6)
RESULT: The table has the counter = 6 (WRONG)
I made the method synchronized. What I was expecting was that only one interface (i1) could enter the method (read the table and update it) while other interfaces running at the same time would have to wait until i1 finished that method.
My first test indicates that's not happening. Can anybody help me to find a solution?

Hi Bhavesh,
If the QOS is EOIO this means that the integration engine manage the call to the mapping program (and all the other blocks) inside an "internal" synchronized method.
So this means that in this case you do not need to manage the queued access (synchronization) inside your custom java code because it is already enveloped in a queued block by XI.
The problem that Jorge had can be easily reproduced using the sample code that follows:
<b>class Synch Object</b>
import java.util.Date;
public class SynchObject {
     String strName;
     public SynchObject(String strName){
          this.strName = strName;
     public synchronized void syncWrite(String strCaller) throws InterruptedException{
          Date now;
          now = new Date();
          System.out.println("-- " + now.toLocaleString() + " " + strCaller + " entering syncWrite of " + strName);
          System.out.flush();
          Thread.sleep(1000);
          now = new Date();
          System.out.println("-- " + now.toLocaleString() + " syncWrite of " + strName + " called by " + strCaller );
          System.out.flush();
          Thread.sleep(1000);
          now = new Date();
          System.out.println("-- " + now.toLocaleString() + " " + strCaller + " leaving syncWrite of " + strName);
          System.out.println("");
          System.out.flush();
<b>class Caller</b>
public class Caller implements Runnable {
     String strName;
     SynchObject target;
     int intMax;
     public Caller(String strName, SynchObject target, int intMax) {
          this.strName = strName;
          this.target = target;
          this.intMax = intMax;
     public void run() {
          for(int i=0; i<intMax;i++)
               try {
                    target.syncWrite(strName);
               } catch (InterruptedException e) {
                    e.printStackTrace();
<b>class Workbench</b>
public class Workbench {
     public static void main(String[] args) {
          // TODO Auto-generated method stub
          SynchObject sObj1 = new SynchObject("syncObj1");
          SynchObject sObj2 = new SynchObject("syncObj2");
          Caller c1 = new Caller("caller1",sObj1,2);
          Caller c2 = new Caller("caller2",sObj1,2); '[*CHANGE*]
          Thread ct1 = new Thread(c1);
          Thread ct2 = new Thread(c2);
          ct1.start();
          ct2.start();
Run the workbench class to see what happen when setting QOS EOIO (the synch object is the same).
To see instead what happen now (missing synchronization) you have to change in Workbench class the statement
Caller c2 = new Caller("caller2",sObj1,2); '[*CHANGE*]
with
Caller c2 = new Caller("caller2",sObj2,2); '[*CHANGE*]
The reason is that every instance of the mapping program declare a new instance of the "Synchronized object" so the calls are synchronized inside the same mapping program but not between several mapping program.
Hope this give you a better idea on this problems with java synchronization, but if you have further doubts (I know it's a little bit tricky ) feel free to ask.
Kind Regards,
Sergio

Implementing DOM Interface with existing Java classes

I had planned on using some tree-like Java classes as a Document Object Model, which would give me access to all sorts of XML and DOM tools like parsers and XSLT transformers. Initially, I thought all that would be neccessary is to implement all the DOM Interfaces in org.w3c.dom and then I would have a set of classes that conformed to DOM Level 1. It was my understanding that interfaces such as DOMImplementation and Document would interface with various XML tools, allowing creation of a class that implements Document and then Document would have its various factory methods that know how to create the various DOM nodes such as Element, Attr, Text, NamedNodeMap, NodeList, etc.
The problem I'm seeing now is that the JAXP specification (which is what the latest Xerces and Xalan tools conform to) has something called a DocumentBuilder and DocumentBuilderFactory that appear to be necessary to tell the framework what type of class to instantiate that implements the Document DOM interface. Those appear to have a lot of methods that deal with parsing of XML documents and I didn't really want to write or even subclass any existing Parsers in order to get the functionality of traversing and transforming a set of classes that implement the DOM interface.
Am I missing something here? Is it possible to plug in any (set of classes for) DOMImplementation and get them to work with the various DOM and XML tools out there?
Is there an easier way to allow parts of an application access to internal data structures but have the more generic tools or APIs, such as XSL transformers, access that same set of classes as a DOM with the generic DOM interface methods?
Can someone provide me with some guidance here? I'm in the process of finalizing some design on a system and need to know if this is possible or if I need to alter my design.
Thanks.

If I understand you correctly, I think I am working on a similar issue. I am unhappy with the methods given by the DOM for retrieving data from the XML file and for building a file. Our software has a bunch of code that uses these classes and it is extremely ugly. My solution was to create a facade on top of the DOM model. Essentially I have some simple classes that store all the pertinent info (for me) about the XML structure. Essentially that is the element or attribute name, its values and in the case of the element, it's children. This makes it easier for me to build and retreive the data. What I then built was a loader class and a builder class. The loader takes an XML file and parses it in using the DOM classes and builds a structure using my classes and returns the root element. The builder takes a root element and creates a DOM object out of it. This frees me of having to code around the DOM classes all over the place and makes it simple to upgrade our XML code if the DOM changes or a better DOM is released. I am using factories to facilitate this and allow me to have loaders for specific types of XML documents so that I can have a class for each which further simplifies the XML related tasks of other developers on my team.

Error ::::: Box.java:2: 'class' or 'interface' expected

Hey ...this is sample program from "java 2 fourth edition by herbert schildt"
Class Box()
double width;
double height;
double depth;
//display volume of the box
void volume() {
System.out.print("Volume is");
System.out.println(width * height * depth);
Class BoxDemo3
public static void main(String args[])
Box mybox1 = new Box();
Box mybox2 = new Box();
//assign values to mybox1 instance variables
mybox1.width = 10;
mybox1.height = 20;
mybox1.depth = 15;
mybox2.width = 3;
mybox2.height = 6;
mybox2.depth = 9;
mybox1.volume();
mybox2.volume();
i have saved it as Box.java and using editplus i have compiled it then i got the error as
Error ::::: Box.java:2: 'class' or 'interface' expected
I think i have to import something in the code ......help me understand java
thanx alot

class, not Class

Where find java classes corresponding to message mapping and interfaces ?

Hi
Forum,
when i create my objects in Repository, like Message interface and messgae mapping, correspoding to them, java class in created, where can i see these java classes in the XI's file system,

Hi sudeep,
During the installation of Xi we select a database.So all the objetcs and related things that we create in IR and ID will be saved in the database only.I dont know how to check the .class file for each object...
Check these weblogs from sravya where she has given you the table names where the IR and ID objects are stored:
/people/sravya.talanki2/blog/2007/01/11/ripping-off-sap-xi-stack-133sharing-the-goodies-of-abap-api146s
/people/sravya.talanki2/blog/2005/12/02/sxicache--ripped-off
/people/sravya.talanki2/blog/2006/12/28/skelton-of-mapping-runtime-in-sap-xi
regards
BILL

'class' or 'interface' expected" on Connection class in java.sql.*

I am currently getting an exception "Main.java:20: 'class' or 'interface' expected". I had the database connection working, but then I tried to add something else and I feel like I might have changed something. I am wondering if there is a problem importing the java.sql. library; since that is where the Connection class is located. Thanks for your feedback.
package javaaaplication2;
import java.sql.*;
public class Main {
    /** Creates a new instance of Main */
    public Main() {
    public static void main(String[] args) {
        Connection con = getConnection();
        System.out.println("The connection is: " +con );
    private static Connection getConnection()
            Connection con = null;
            try
                Class.forName("com.mysql.jdbc.Driver");
                String url = "jdbc:mysql://localhost/patients";
                String user = "root";
                String pw = "qwerty";
                con = DriverManager.getConnection(url, user, pw);
            catch (ClassNotFoundException e)
                System.out.print(e.getMessage());
                System.exit(0);
            catch (SQLException e)
                System.out.print(e.getMessage());
                System.exit(0);
            return con;
    }

You closed your Main class with a bracket, so your getConnection() method isn't in a class
public class Main {
    /** Creates a new instance of Main */
    public Main() {
    public static void main(String[] args) {
        Connection con = getConnection();
        System.out.println("The connection is: " +con );
}That is your entire Main class. Anything below it isn't in the class.

Java SSF Library - interface ISsfData and class SsfDataXML

Hello all,
Can anybody tell me in which Java library I can find the interface ISsfData and class SsfDataXML used in the following example (see link)?
http://help.sap.com/saphelp_nw70/helpdata/EN/a4/d0201854fb6a4cb9545892b49d4851/frameset.htm
Which JAR file(s) contain these libraries? It is described as the Java SSF Library...
I would like to copy this file locally and add it as an External Library to an Eclipse project.
Many thanks,
Aldo

Hi Aldo,
The java packages where this classes and interfaces are implemented are:
- com.sap.security.api.ssf
- com.sap.security.core.server.ssf
You can find this in the jar file tc_sec_ssf.jar.
Also look the following SAP Help link [Secure Store and Forward Mechanism (SSF)|http://help.sap.com/saphelp_nw2004s/helpdata/en/4d/bf6f77a2c5446a86e0152f1b309db6/frameset.htm]
Please reward if helpful.
Regards
Alexandre

Java :27 class enum,interface expected

hi all
this code return error java:27 class enum,interface expected when run
what wrong with it ?
thank you
denny
//Find Maximum of 2 nos.
class Maxof2{
public static void main(String args[]){
      //taking value as command line argument.
      //Converting String format to Integer value
      int i = Integer.parseInt(args[0]);
      int j = Integer.parseInt(args[1]);
      if(i > j)
          System.out.println(i+" is greater than "+j);
      else
          System.out.println(j+" is greater than "+i);
}

hello all
i find one more line at the bottom of the code ( I just copy paste from the website which give example ,and more then code area copied)
after i remove that line
It ok now it compiled smoothly wjthout error but now it return error when run
the error message is :
Exception in thread "main" java.lang.ArrayIndexOutOfboundsException: 0 at Maxof2.main(Maxof2.java:15)
uuh how difficult java is
denny
tq

Problem with servicegen and how to convert java classes to webservices

I am a beginner and am trying to convert all my java code into webservices,I have
a java class Test.java and number of other third party libraries and my own java
files that are reffered in Test.java. I want to expose the public methods in Test.java
as webservices.
the serivegen part of My build.xml is as below
<servicegen
destEar="${APPLICATIONS}/${ear_file}"
warName="${war_file}">
<service
javaClassComponents="com.verizon.Test"
targetNamespace="${namespace}"
serviceName="Test"
serviceURI="/Test"
generateTypes="True"
expandMethods="True">
</service>
<classpath>
<pathelement path="${build}"/>
<pathelement path="${java.class.path}"/>
</classpath>
</servicegen>
When i run ant it complains:
[servicegen] weblogic.xml.schema.binding.BindingException: Invalid class received:
interface org.apache.crimson.tree.ElementFactory loaded from file:/apps/opt/crimson.jar!/org/apache/crimson/tree/ElementFactory.class.
All classes that will be serialized or deserialized must be non-interface, non-abstract
classes that provide a public default constructor
I have no clue,Why is Servicegen introspecting the third party class file also?I
just need the public methods in Test.java exposed and Test.java will just use
the third party library.
also,is there a way to tell servicegen to include all these java files X,Y,Z to
the war file/ear files but expose only the public methods of X in the WSDL.
Please help
thanks
Suresh

Hi Bruce,
Thanks very much for the insight u provided.Yes one of my public methods was returning
a element factory.
But let me ask my question this way:
Is there a way to tell servicegen to take only the specified public methods in
a class to make them as webservices?
by default servicegen is taking all the public methods..,i workaround i found
is to deploy the webservice manually by writing the web-services.xml to include
only the required public methods.
thanks
Suresh
Bruce Stephens <[email protected]> wrote:
Hi Suresh,
Does your Test.java have a public method that returns the element
factory of an XML document, like "public ElementFactory
getElementFactory ();" or such?
If so, you may want to check out the supported build-in and non-built-in
data types:
http://edocs.bea.com/wls/docs81/webserv/assemble.html#1060696
Concerning your last question, you can use the excludeEJBs, includeEJBs
(in combination with the ejbJar attribute) to specify which non-built-in
data type components should be generated. Or if you use the
javaClassComponents then simply use a comma separated list of class
names.
Hope this helps,
Bruce
suresh wrote:
I am a beginner and am trying to convert all my java code into webservices,Ihave
a java class Test.java and number of other third party libraries andmy own java
files that are reffered in Test.java. I want to expose the public methodsin Test.java
as webservices.
the serivegen part of My build.xml is as below
<servicegen
destEar="${APPLICATIONS}/${ear_file}"
warName="${war_file}">
<service
javaClassComponents="com.verizon.Test"
targetNamespace="${namespace}"
serviceName="Test"
serviceURI="/Test"
generateTypes="True"
expandMethods="True">
</service>
<classpath>
<pathelement path="${build}"/>
<pathelement path="${java.class.path}"/>
</classpath>
</servicegen>
When i run ant it complains:
[servicegen] weblogic.xml.schema.binding.BindingException: Invalidclass received:
interface org.apache.crimson.tree.ElementFactory loaded from file:/apps/opt/crimson.jar!/org/apache/crimson/tree/ElementFactory.class.
All classes that will be serialized or deserialized must be non-interface,non-abstract
classes that provide a public default constructor
I have no clue,Why is Servicegen introspecting the third party classfile also?I
just need the public methods in Test.java exposed and Test.java willjust use
the third party library.
also,is there a way to tell servicegen to include all these java filesX,Y,Z to
the war file/ear files but expose only the public methods of X in theWSDL.
Please help
thanks
Suresh

How to fix 'class' or 'interface' expected for jsp

below is the stack trace
org.apache.jasper.JasperException: Unable to compile class for JSP
Generated servlet error:
/home/sherali/.netbeans/5.5/apache-tomcat-5.5.17_base/work/Catalina/localhost/UVSDataSearch/org/apache/jsp/pager_002ddemo_jsp.java:7: 'class' or 'interface' expected
import java.util.*;
^
Generated servlet error:
/home/sherali/.netbeans/5.5/apache-tomcat-5.5.17_base/work/Catalina/localhost/UVSDataSearch/org/apache/jsp/pager_002ddemo_jsp.java:8: 'class' or 'interface' expected
import java.io.*;
^
2 errors
thanks a lot in advance.
my jsp is
<%@ page session="false" %>
<%@ page import="tauvex.*;" %>
<%@ page import="java.util.*" %>
<%@ page import="java.io.*" %>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%@ taglib uri="http://jsptags.com/tags/navigation/pager" prefix="pg" %>
<html>
<head>
<title>Tauvex Search Results</title>
<%
* Pager Tag Library
* Copyright (C) 2002 James Klicman <[email protected]>
* The latest release of this tag library can be found at
* http://jsptags.com/tags/navigation/pager/
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
%>
<style type="text/css">
A.nodec { text-decoration: none; }
</style>
</head>
<body bgcolor="#ffffff">
<%
String style = getParam(request, "style", "simple");
String position = getParam(request, "position", "top");
String index = getParam(request, "index", "center");
int maxPageItems = getParam(request, "maxPageItems", 3);
int maxIndexPages = getParam(request, "maxIndexPages", 3);
%>
<%
String query1=(String)request.getAttribute("query1");
String query=(String)request.getAttribute("query");
String ShowFile=(String)request.getAttribute("ShowFile");
String ShowRA=(String)request.getAttribute("ShowRA");
String ShowDEC=(String)request.getAttribute("ShowDEC");
String Telescope=(String)request.getAttribute("Telescope");
String ObservationDates=(String)request.getAttribute("ObservationDates");
String Filter=(String)request.getAttribute("Filter");
String RA=(String)request.getAttribute("RA");
String DEC=(String)request.getAttribute("DEC");
String DATE=(String)request.getAttribute("DATE");
String DATE1=(String)request.getAttribute("DATE1");
String Radious=(String)request.getAttribute("Radious");
String FILTER[]=(String[])request.getAttribute("FILTER");
String OrderBy1=(String)request.getAttribute("OrderBy1");
String OrderBy2=(String)request.getAttribute("OrderBy2");
String OrderBy3=(String)request.getAttribute("OrderBy3");
%>
<%
out.println("<form action=\"PlainSQLQuery\" method=POST>");
out.println("<textarea rows = 5 cols = 40 name=query id=\"query\">");
out.println(query);
out.println("</textarea>");
out.println("<input type = submit value = \"Submit\">");
out.println("<input type = reset value = \"Reset\">");
out.println("</form>");
%>
<center>
<table border="0" width="90%" cellpadding="4">
<tr>
<td colspan="2" align="left" valign="top">
<table border="0" cellspacing="2" cellpadding="0">
<tr><td>Max. Page Items </td>
<td><input type="text" size="4" name="maxPageItems" value="<%= maxPageItems %>" onChange="this.form.submit();"></td></tr>
<tr><td>Max. Index Pages </td>
<td><input type="text" size="4" name="maxIndexPages" value="<%= maxIndexPages %>" onChange="this.form.submit();"></td></tr>
</table>
</td>
</tr>
</table>
<pg:pager
index="<%= index %>"
maxPageItems="<%= maxPageItems %>"
maxIndexPages="<%= maxIndexPages %>"
url="TauvexDataServlet"
export="offset,currentPageNumber=pageNumber"
scope="request">
<%-- keep track of preference --%>
<pg:param name="style"/>
<pg:param name="position"/>
<pg:param name="index"/>
<pg:param name="maxPageItems"/>
<pg:param name="maxIndexPages"/>
<pg:param name="RA"/>
<pg:param name="DEC"/>
<pg:param name="DATE"/>
<pg:param name="DATE1"/>
<pg:param name="Radious"/>
<pg:param name="FILTER"/>
<pg:param name="ShowRA"/>
<pg:param name="ShowDEC"/>
<pg:param name="Telescope"/>
<pg:param name="ObservationDates"/>
<pg:param name="Filter"/>
<pg:param name="OrderBy1"/>
<pg:param name="OrderBy2"/>
<pg:param name="OrderBy3"/>
<%-- save pager offset during form changes --%>
<input type="hidden" name="pager.offset" value="<%= offset %>">
<%-- warn if offset is not a multiple of maxPageItems --%>
<% if (offset.intValue() % maxPageItems != 0 &&
("alltheweb".equals(style) || "lycos".equals(style)) )
%>
<p>Warning: The current page offset is not a multiple of Max. Page Items.
<br>Please
<pg:first><a href="<%= pageUrl %>">return to the first page</a></pg:first>
if any displayed range numbers appear incorrect.</p>
<% } %>
<%-- the pg:pager items attribute must be set to the total number of
items for index before items to work properly --%>
<% if ("top".equals(position) || "both".equals(position)) { %>
<br>
<pg:index>
<% if ("texticon".equals(style)) { %>
<jsp:include page="/WEB-INF/jsp/texticon.jsp" flush="true"/>
<% } else if ("jsptags".equals(style)) { %>
<jsp:include page="/WEB-INF/jsp/jsptags.jsp" flush="true"/>
<% } else if ("google".equals(style)) { %>
<jsp:include page="/WEB-INF/jsp/google.jsp" flush="true"/>
<% } else if ("altavista".equals(style)) { %>
<jsp:include page="/WEB-INF/jsp/altavista.jsp" flush="true"/>
<% } else if ("lycos".equals(style)) { %>
<jsp:include page="/WEB-INF/jsp/lycos.jsp" flush="true"/>
<% } else if ("yahoo".equals(style)) { %>
<jsp:include page="/WEB-INF/jsp/yahoo.jsp" flush="true"/>
<% } else if ("alltheweb".equals(style)) { %>
<jsp:include page="/WEB-INF/jsp/alltheweb.jsp" flush="true"/>
<% } else { %>
<jsp:include page="/WEB-INF/jsp/simple.jsp" flush="true"/>
<% } %>
</pg:index>
<% } %>
<hr>
<form action="ZipServlet" method="get" name="download" onsubmit="return Form1_Validator(this)">
<table id="output">
<CAPTION><EM>Fits file Search Results</EM></CAPTION><tr>
<%
out.println("<th>Check Box</th>");
out.println("<th>File Name</th>");
if(ShowRA != null && "on".equals(ShowRA))
out.println("<th>RA_START</th>");
if(ShowRA != null && "on".equals(ShowRA))
out.println("<th>RA_END</th>");
if(ShowDEC != null && "on".equals(ShowDEC))
out.println("<th>DEC_START</th>");
if(ShowDEC != null && "on".equals(ShowDEC))
out.println("<th>DEC_END</th>");
if(Telescope!=null && "on".equals(Telescope))
out.println("<th>Telescope</th>");
if(ObservationDates !=null && "on".equals(ObservationDates))
out.println("<th>STARTOBS</th>");
if(ObservationDates !=null && "on".equals(ObservationDates))
out.println("<th>ENDOBS</th>");
if(Filter!=null && "on".equals(Filter))
out.println("<th>FILTER</th>");
out.println("</tr>");
%>
<%--
<table width="90%" cellspacing="4" cellpadding="4">
Since the data source is static, it's easy to offset and limit the
loop for efficiency. If the data set size is not known or cannot
be easily offset, the pager tag library can count the items and display
the correct subset for you.
The following is an example using an enumeration data source of
unknown size. The pg:pager items and isOffset attributes must
not be set for this example:
--%>
<%
Enumeration myDataList1 = (Enumeration)request.getAttribute("myDataList1");
if (myDataList1 == null)
throw new RuntimeException("myDataList1 is null");
%>
<% while (myDataList1.hasMoreElements()) { %>
<% TauvexData elem = (TauvexData)myDataList1.nextElement(); %>
<pg:item> <%
out.println("<tr>");
%>
<td><input type= "checkbox" name="cb" value="<%=elem.getDownload()%>"></td>
<td><a href="<%= elem.getDownload() %>"><%= elem.Fitsfilename %></a></td>
<%
// out.println("<td> "+elem.Fitsfilename+" </td>");
if(ShowRA != null && "on".equals(ShowRA))
out.println("<td> "+elem.RA_START+" </td>");
if(ShowRA != null && "on".equals(ShowRA))
out.println("<td> "+elem.RA_END+"</td>");
if(ShowDEC != null && "on".equals(ShowDEC))
out.println("<td> "+elem.DEC_START+" </td>");
if(ShowDEC != null && "on".equals(ShowDEC))
out.println("<td> "+elem.DEC_END+" </td>");
if(Telescope!=null && "on".equals(Telescope))
out.println("<td> "+elem.telescope+" </td>");
if(ObservationDates !=null && "on".equals(ObservationDates))
out.println("<td> "+elem.STARTOBS+" </td>");
if(ObservationDates !=null && "on".equals(ObservationDates))
out.println(" <td> "+elem.ENDOBS+" </td>");
if(Filter!=null && "on".equals(Filter))
out.println("<td> "+elem.FILTER+" </td>");
out.println("</tr>");
%> </pg:item>
<% } %>
</table>
<input type="button" name="CheckAll" value="Check All Boxes" onclick="modify_boxes(true,3)">
<input type="button" name="UnCheckAll" value="UnCheck All Boxes" onclick="modify_boxes(false,3)">
<input type="submit" value="Download">
</form>
<hr>
<pg:pages>
<a href="<%= pageUrl %>"><%= pageNumber %></a>
</pg:pages>
<pg:last>
<a href="<%= pageUrl %>">[ Last >| (<%= pageNumber %>) ]</a>
</pg:last>
<% if ("bottom".equals(position) || "both".equals(position)) { %>
<pg:index>
<% if ("texticon".equals(style)) { %>
<jsp:include page="/WEB-INF/jsp/texticon.jsp" flush="true"/>
<% } else if ("jsptags".equals(style)) { %>
<jsp:include page="/WEB-INF/jsp/jsptags.jsp" flush="true"/>
<% } else if ("google".equals(style)) { %>
<jsp:include page="/WEB-INF/jsp/google.jsp" flush="true"/>
<% } else if ("altavista".equals(style)) { %>
<jsp:include page="/WEB-INF/jsp/altavista.jsp" flush="true"/>
<% } else if ("lycos".equals(style)) { %>
<jsp:include page="/WEB-INF/jsp/lycos.jsp" flush="true"/>
<% } else if ("yahoo".equals(style)) { %>
<jsp:include page="/WEB-INF/jsp/yahoo.jsp" flush="true"/>
<% } else if ("alltheweb".equals(style)) { %>
<jsp:include page="/WEB-INF/jsp/alltheweb.jsp" flush="true"/>
<% } else { %>
<jsp:include page="/WEB-INF/jsp/simple.jsp" flush="true"/>
<% } %>
</pg:index>
<% } %>
</pg:pager>
</center>
</body>
</html>
<%!
private static int num =1;
private static String getName(){
String str="cb";
str=str+num;
num++;
return str ;
private static final String getParam(ServletRequest request, String name,
String defval)
String param = request.getParameter(name);
return (param != null ? param : defval);
private static final int getParam(ServletRequest request, String name,
int defval)
String param = request.getParameter(name);
int value = defval;
if (param != null) {
try { value = Integer.parseInt(param); }
catch (NumberFormatException ignore) { }
return value;
private static void radio(PageContext pc, String name, String value,
boolean isDefault) throws java.io.IOException
JspWriter out = pc.getOut();
String param = pc.getRequest().getParameter(name);
out.write("<input type=\"radio\" name=\"");
out.write(name);
out.write("\" value=\"");
out.write(value);
out.write("\" onChange=\"this.form.submit();\"");
if (value.equals(param) || (isDefault && param == null))
out.write(" checked");
out.write('>');
%>

Well, putting all that Java code into a JSP was a bad idea in the first place, just on general design principles. But you've done it in such a way that the result of compiling the JSP is malformed Java code. Frankly I would just throw it away and put the Java code into a servlet or some other Java class, where it belongs.
But if you're really working in a place where nobody has learned anything since 2003, and you're forced to support that old junk, then I would point out that the error occurs before the place which generates this line:
import java.util.*;You only need to look at two of the thousand lines of code you posted.

How to convert java .class file to .dll file

hi,
I got a problem, I have to convert my java .class file to .dll file. Microsoft VC++ program will invoke the converted .dll file.
Is there any other possibility.
I was confused.
Cam any body help me. If you are having solution for the can you send to my [email protected] account.
thanks,

No, it is not possible to do what you are suggesting. Yes, you could produce a DLL that wraps the JVM and loads your java class exposing a C and/or C++ callable interface, but that is a lot to go through unless your class is VERY complex. Otherwise, you might want to just create and maintain two implementations.

How to load a java class at server start-up

Hi,
I have one custome java class that is being referenced by all the applications deployed in OC4J container. How can I load that class automatically and be evailable in the path at server start-up time. Is there an option available to give the class name that also gets loaded automatically.
Thanks

To me, you have two mixed issues.
1. OC4J supports a startup/shutdown model where a named class will be invoked when the container is started (or stopped).
This is described in the doc here:
http://download-west.oracle.com/docs/cd/B32110_01/web.1013/b28952/startclas.htm#CIHECEIB
Note that this specifically calls the methods that are implemented from the respective OC4JShutdown and OC4JStartup interfaces -- the class that is instantiated and called here is not available to all other applications by default. This is more to suit the need where something needs to be done when the container is started/stopped.
2 The next option is where you just want to make a class available to all applications deployed to the container. For this we provide the shared-library mechanism. Using this you can either make use of the implicit global.libraries shared-lib in which you simply drop JAR files into the j2ee/home/applib directory whereupon the classes will become available by default to all applications. Or you can choose to install a shared-library that contains your specific classes (in a JAR file) and then import that into the default application whereupon the configuration will be inherited by all deployed applications.
cheers
-steve-

How can i access the methods if i only got the java class file?

just like what the topic said...i would like to ask if i only got the class file of java without API documentation. how can i know what method is included ?
thanks a lot.
my email address is : [email protected]

Class.getMethods()
throws SecurityException
Returns an array containing Method objects reflecting all the public member methods of the class or interface represented by this Class object, including those declared by the class or interface and and those inherited from superclasses and superinterfaces. The elements in the array returned are not sorted and are not in any particular order. This method returns an array of length 0 if this Class object represents a class or interface that has no public member methods, or if this Class object represents an array class, primitive type, or void.

Java Class vs Interface

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