Using return statement in jsp

Hi all,
I am using return statement in JSP page after a redirect to stop executing that page. If the data bean is not present then it must go to previous page. When this return statement is executed the previous page is displayed but url in browser remains same. Why it is so ?. Is there any other way to tell a JSP page to stop executing and redirect to another page.
rgds
Antony Paul

Hi Antony,
do you use the "forward()" method or the "redirect()" method???
rgds
Howy

Similar Messages

Can we use return statement in procedure?

Can we use return statement in procedure or we can use more than one return statement in procedure?

HamidHelal wrote:
NOReally? Did you at least test it? You can use RETURN in procedure or in anonymous PL/SQL block. The only restriction is you can't specify return value:
SQL> begin
2      dbms_output.put_line('Before return');
3      return;
4      dbms_output.put_line('After return');
5 end;
6 /
Before return
PL/SQL procedure successfully completed.
SQL> create or replace
2    procedure p1
3      is
4      begin
5          dbms_output.put_line('Before return');
6          return;
7          dbms_output.put_line('After return');
8 end;
9 /
Procedure created.
SQL> exec p1;
Before return
PL/SQL procedure successfully completed.
SQL> begin
2      dbms_output.put_line('Before return');
3      return 99;
4          dbms_output.put_line('After return');
5 end;
6 /
    return 99;
ERROR at line 3:
ORA-06550: line 3, column 5:
PLS-00372: In a procedure, RETURN statement cannot contain an expression
ORA-06550: line 3, column 5:
PL/SQL: Statement ignored
SQL> create or replace
2    procedure p1
3      is
4      begin
5          dbms_output.put_line('Before return');
6          return 99;
7          dbms_output.put_line('After return');
8 end;
9 /
Warning: Procedure created with compilation errors.
SQL> show err
Errors for PROCEDURE P1:
LINE/COL ERROR
5/9      PL/SQL: Statement ignored
5/9      PLS-00372: In a procedure, RETURN statement cannot contain an
         expression
SQL> SY.

Unreachable statement error occured while using return statement.

Consider this code
class q25{
     public static void main(String args[]){
          amethod(args);
     public static void amethod(String args[]){
          String str;
          try{
               str = "Hello "+args[0];
               System.out.println(str);
               System.out.println("Returning to caller");
               System.exit(0);
          catch(Exception e){
               System.out.println("Exception ocured");
               System.exit(0);
          finally{
               System.out.println("In finally");
          System.out.println("At the end of method");
}Above code compiles and runs successfully without any errors.
Now consider below code which is same as above one except "System.exit(0)" statements were replace by "return" statements. Below code when compiled gives error as
"q25.java:22: unreachable statement
System.out.println("At the end of method");
^
1 error"
One thing i didn't understood in this context that, the above code when compiled should get same error as stated above. But not. It is obvious that presence of System.exit(0) must generate unreachable statement same as when it is replaced by "return" statement. What is the difference in getting the error for above but not for below code. Pls anyone help.
class q25{
     public static void main(String args[]){
          amethod(args);
     public static void amethod(String args[]){
          String str;
          try{
               str = "Hello "+args[0];
               System.out.println(str);
               System.out.println("Returning to caller");
               return;
          catch(Exception e){
               System.out.println("Exception ocured");
               return;
          finally{
               System.out.println("In finally");
          System.out.println("At the end of method");
}

warnerja wrote:
masijade. wrote:
Since you have a "return" in both the try and the catch portions of the try/catch block *(the second of which you should never do)* , anything thing that comes after the try/catch/finally blocks will be unreachable.That is not true. There are plenty of reasons to return from a catch block. If you handle the exception instead of rethrowing it or another exception, then you'll need a return somehow, either there or after the catch block. What you should never do is "return" in a finally block, because that will mask any exception in flight about to be thrown to the caller.Perhaps masijade's use of never is too strong, but I too prefer/tend to avoid using return anywhere in try/catch/finally to avoid potential gotchas. Consider:
public class TryCatchFinally
public Data process(String s)
    Data returnData = new Data();
    try
      returnData.value = Integer.parseInt(s);
      returnData.message = "Success";
      return returnData;
    catch (Exception ex)
      returnData.value = -1;
      returnData.message = "Fail";
      return returnData;
    finally
      returnData.value = 42;
      returnData.message = "?";
public static void main(String[] args)
    TryCatchFinally demo = new TryCatchFinally();
    Data d = demo.process("2");
    System.out.println(d.message + ": " + d.value);
    d = demo.process("2.1");
    System.out.println(d.message + ": " + d.value);
class Data
    int value = 0;
    String message = "";
}

How to use switch statement in JSP?

Hi,
I am using switch satement in jsp.
the code as follows:
switch(flag)
     case 1: query="select * from cust";
                    break;
     case 2: query="select * from cust where minp="+mini+"and maxp="+maxi;
                    break;
    default: query="";
out.println(query);but, i am getting some number format exception. I don't know where i am going wrong.
Please help
Regards,
Ashvini

I got the solution
Thanks anyways
Regards,
AShvini

How to write statement using LIKE statement in jsp

hi
I am new to jsp. I would like to retrive the data from database using like command. But my query dosen't work well. Can you help me in this topic.
String name = request.getParameter("username");
int i = st.executeQuery("select * from emp where empname LIKE '%name%'");
Plase help me..
Thanking you
sure...

Using LIKE :
==========
The following SQL statement will return persons with first names that start with an 'O':
SELECT * FROM Persons
WHERE FirstName LIKE 'O%'
The following SQL statement will return persons with first names that contain the pattern 'la':
SELECT * FROM Persons
WHERE FirstName LIKE '%la%'
Hope this might have helped you
REGARDS,
RaHuL

How can i use return statement in a method no flaming pls

public class example2
public int add(int i,int j)
int k = i + j;
return k; <<<< -HERE->
public static void main(String[] args)
example2 obj=new example2();
obj.add(2,3);
System.out.println("k"+k);
Iam really really new to java programming so dont flame me
In the above program i was hoping by putting return k it would return vlaue of k to the calling object but it didnt work i had to place sys.out.println in the method and take out the return from the method for it to work
So why dosent it work and where is it returned to the k value.

BlueRibbon wrote:
In the above program i was hoping by putting return k it would return vlaue of k to the calling objectThat's what happens, yes. The VALUE of k is returned, not the NAME k, so you cannot refer to the value by just k. To the caller, the value is obtained by evaluating the expression that calls the function. So you could do
public class example2
     public int add(int i, int j)
          return i + j;
     public static void main(String[] args)
          example2 obj = new example2();
          System.out.println(obj.add(2, 3));
}

Using break statement

Hi,
I have a function, which has to check if any one of the 20 feelds are set - If so it has to return true.
As of now i am doing lik this:
boolean xyz(object a)
result=false;
if(isTure(a.A)
result=true;
if(isTrue(a.B)
result=true;
....like this i am adding 20 if cinditions.. which doesn't lokk good.
Can i use Break, so that if any one is true- It will break and return true.
Please help me. I am new to java and want to now the effecient way to write this function

Try to use If else statements.
if(isTure(a.A){
     return true;
     break;
else if(isTrue(a.B))
     return true;
     break;
...like this upto 20
return false;Cheers.That's just plain silly code. No use in having a break following a return, break has no meaning outside a loop or a switch and don't need else-if if you're using return statements.
3 options:
1. Use else ifif (isTrue(a.A)) result = true;
else if (isTrue(a.B)) result = true;
//...2. Use return statementsif (isTrue(a.A)) return true;
if (isTrue(a.B)) return true;
// 20 more
return false;3. Make it a real predicate functionreturn isTrue(a.A) || isTrue(a.B) || isTrue(a.C) // ...

Which return statement i should use.

I have a problem regarding the return statement that i should use in the following programe.
//Printing random letters without vowels
public class Capitals {
public char mymethod (){
     int counter = 0;               // Counter for number of capitals generated.
    int numberToGenerate = 20;     // Number of capitals to generate.
    char symbol = 0;               // Variable to store a random character.
    // While there are still letters to generate:
          while( counter < numberToGenerate ) {
      // Generate a random symbol between A and Z:
      // This relies on the fact that the codes for the letters are in a
      // contiguous sequence from 'A' to 'Z'. If we add 1 to 'A' we get the
      // code for 'B', if we add 2 we get 'C', and so on. Thus to create a
      // random capital letter from 'A' to 'Z' we can add a random integer
      // between 0 and 25 to 'A'.
      symbol = (char)(26*Math.random() + 'A');
      switch(symbol) {
        //Vowels ignored:
        case 'A':
        case 'E':
        case 'I':
        case 'O':
        case 'U':
          break;
        default:
          //Consonant displayed:
          System.out.print(symbol + " ");
          counter++;
          break;
return symbol; // My Problem is here <<<<<<<<<<<<<
public static void main(String args[])   {
Capitals myCapitals=new Capitals();
myCapitals.mymethod();
}Can anyone kindly guide as to what return statement i should use in mymethod() so that it can be called in the main.
thanks

return types are not compulsory. there's a school of though amongst some 'C' programmers, that all functions should return something, even if the returned value is of no interest most of the time. some C compilers even force this behaviour, I think it's part of some standard but I can't remember now
anyways, methods that have something to return need a return type, those that don't can be void. if you're invoking a method just to get it to do some work, it can probably be void, but if it's doing some computation for you you'll likely want to know the result, hence it must return something

Problems with asynchronous(?) function call before return statement

I have a function as following inside a class deriving from CustomNode:
override protected function create () : Node {
                parseContent();
                return group;
        }parseContent() executes a HttpRequest and then a PullParser. At least that's what it should do. But actually, it doesn't. Is this because the HttpRequest is asynchronous and is "cancelled" because of the return statement? Or can't this be the problem?

You would have to update or create the view in the finally block of the onOutput: or onInput methods within the request.
You could also try
var viewContent: Node;
override protected function create () : Node {
                parseContent();
                FX.deferAction(function():Void{
                       viewContent = group;
                return Group{ content: bind viewContent }
        }I never tried that, but it might work.
Another option is to bind the parsed content to whatever view you are pushing it to. Then whenever the request is done, the view will populate its content on the change of the variable where the content is stored.
Example:
var allTables: TableModel[];
//***************start of table list decleration****************************\\
public var list: SwingJList = SwingJList {
    var shortcutKey: Boolean = false;
    focusTraversable: true
    selectedIndex: 0
    action: function(){
        FX.deferAction(function():Void{
            openButton.fire();
    items: bind for( table in allTables ){
        table.name
var searchDataXml = xmlGenerator.generateSearchXMLString(searchData);
var contentLength: Integer = searchDataXml.getBytes().length;
def postRequest: HttpRequest = HttpRequest {
    location: "{WEB_APPLICATION_REQUEST_URL}searchData/?database={DATABASE_KEY}";
    method: HttpRequest.POST;
    headers: [
            HttpHeader {
                name: HttpHeader.CONTENT_TYPE;
                value: "application/xml";
            HttpHeader {
                name: HttpHeader.CONTENT_LENGTH;
                value: "{contentLength}";
    onStarted: function() {
        println("onStarted - started performing method: {postRequest.method} on location: {postRequest.location}");
    onConnecting: function() { println("onConnecting") }
    onDoneConnect: function() { println("onDoneConnect") }
    onWriting: function() { println("onWriting") }
    onOutput: function(os: java.io.OutputStream) {
        try {
            os.write(searchDataXml.getBytes());
        } finally {
            println("onOutput - about to close output stream.");
            os.close();
            os.flush();
    onToWrite: function(bytes: Long) { println("onToWrite - entire content to be written: {bytes} bytes") }
    onWritten: function(bytes: Long) { println("onWritten - {bytes} bytes has now been written") }
    onDoneWrite: function() { println("doneWrite") }
    onReadingHeaders: function() { println("onReadingHeaders") }
    onResponseCode: function(code:Integer) { println("onResponseCode - responseCode: {code}") }
    onResponseMessage: function(msg:String) { println("onResponseMessage - responseMessage: {msg}") }
    onResponseHeaders: function(headerNames: String[]) {
        println("onResponseHeaders - there are {headerNames.size()} response headers:");
        for (name in headerNames) {
            println("    {name}: {postRequest.getResponseHeaderValue(name)}");
    onReading: function() { println("onReading") }
    onToRead: function(bytes: Long) {
        if (bytes < 0) {
            println("onToRead - Content length not specified by server; bytes: {bytes}");
        } else {
            println("onToRead - total number of content bytes to read: {bytes}");
    onRead: function(bytes: Long) {
        // The toread variable is non negative only if the server provides the content length
        def progress =
        if (postRequest.toread > 0) "({(bytes * 100 / postRequest.toread)}%)" else "";
        println("onRead - bytes read: {bytes} {progress}");
    var parser = new XmlPullParser();
    onInput: function(is: java.io.InputStream) {
        // use input stream to access content here.
        // can use input.available() to see how many bytes are available.
        try {
            allTables = parser.processResults(is);
        } finally {
            is.close();
    onException: function(ex: java.lang.Exception) {
        println("onException - exception: {ex.getClass()} {ex.getMessage()}");
    onDoneRead: function() { println("onDoneRead") }
    onDone: function() { println("onDone") }
postRequest.start();
} In this case an array of tableModel names are bound to the list view.
When the httprequest ends, it sets the parsed tableModel array to the array declared in this class.
The list view will populate the table names from the array when the request finishes.

If we use DML statement in function then that function can be used inside s

if we use DML statement in function then that function can be used inside select query or any DML query?

select f from t2;I think you meant to query t1.
It works if the function is an autonomous transaction:
create or replace function f return number
is
PRAGMA AUTONOMOUS_TRANSACTION;
begin
    update t1 set c=2;
    commit;
    return 1;
end;
select f from t1But as Billy said why would you want to do DML this way. And this is not the way autonomous procedures should be used either.
An an answer to an interview question though nothing wrong with it.

SQL LIKE statement in JSP

I tried to write a query in jsp page using LIKE statement. However, Apache Tomcat report back an error in the query string. I tried to run the same query style in MS Access and it works. Can someone please tell me where is the error in jsp code:
JSP Code:
sql = "SELECT tblStudent.firstName, tblStudent.lastName, tblStudent.studentID FROM tblStudent WHERE (((tblStudent.firstName) LIKE '%" + g_firstNameInput + "%')) ORDER BY tblStudent.firstName";
MS Acccess:
SELECT tblStudent.firstName, tblStudent.lastName, *
FROM tblStudent
WHERE (((tblStudent.firstName) Like '*e*'))
ORDER BY tblStudent.firstName;
PS: I tried changing from '%' to '*' already, but still does not work
Thanks

Don't use JSP for SQL querries... to complicated.
1) Write a Java application that does what you want (as far as interacting with the database
2) Isolate the database access code into its own class/classes
3) Double check that you can then use those isolated classes inside a command line application
4) Adapt the code you used in 3) to use those same classes from a JSP - preferrably using Java Beans and DTOs

"missing return statement" error code

well... i feel like such a n00b... I can't seem to figure out what the problem is with my code, if someone could help me, that would be great. I get an error saying 'missing return statement'. I know that I have some things in here that I don't need but I will need them as I go on making this program.
with this code:
import java.io.*;
import java.math.*;
public class Tester
     public static int time = 0;
     public static void main(String[] args) throws IOException
          System.out.println("Welcome to the 2008 Java Games!!!");
          time=1000;
          delay(100);
          //Method Name: delay
          //Method Arguments: used to wait for a given time
          //Goal of Method: Delay for a given time
     public static int delay(int time)
          try {
               Thread.sleep(time);
          catch(InterruptedException ex) {}
          time++;
}

What does the error say? "Missing return statement"? Then I'm going to venture a guess and say that you're missing a return statement. If you don't know what a return statement is, then you have some learning to do:
http://java.sun.com/docs/books/tutorial/java/javaOO/returnvalue.html
Read that, then look at your delay() method and how you call it. And notice that you've made delay() of type "int".
Edit: Or just have someone else give you the answer :P
Edited by: newark on Feb 27, 2008 3:20 PM

How to use prepared statement - For Everyone Help

public String count()
int count = 0;
String fetchsize = "";
try
Connection conn = getOADBTransaction().getJdbcConnection();
Statement statement = conn.createStatement();
String Query = "select count(*) count from fnd_lookups where lookup_type like 'SAPE_BILL_TO_SHIP_TO_UPDATE'";
ResultSet resultset = statement.executeQuery(Query);
while (resultset.next())
count = (int)resultset.getInt("count");
fetchsize = ""+count;
catch(Exception e)
return fetchsize;
}

Hi,
we can use prepare statement in Co....
import java.sql.PreparedStatement;
import java.sql.ResultSet;
try
PreparedStatement prpdStmt1 = am.getOADBTransaction().getJdbcConnection().prepareStatement("select full_name from per_all_people_f where person_id='"+empid+"' ");
ResultSet rs=prpdStmt1.executeQuery(); //Cursor fetch row
while(rs.next())
empname=rs.getString(1);
catch(Exception e)
System.out.println("Exception is"+e.getMessage());
t1.setValue(pageContext,empname);
Thanks
nani

How to use cusom classes in jsp

Dear all,
Would anyone teach me how to import and use my custom classes
in my jsp? I've been unable to import the classes that reside in the same
directory as the jsp file. Some detailed explanation with sample folder structure
will be much appreciated.

Thanks for the response.
First, I've not yet touched Java beans. Don't yet know how to create them.
Hence what I'm trying to do now is write an ordinary Java class and import it into
the jsp via page directive.
After your suggestion, I created the following folder structure in Tomcat5.
webapps/mainalee_jsp/WEB-INF/
WEB-INF/classes
WEB-INF/lib
WEB-INF/web.xml
I've a JSP file, jsp1.jsp in the path: webapps/mainalee_jsp
I've a java class, testclass.class, in the path: webapps/mainalee_jsp/WEB-INF/classes
The codes are as follows:
testclass.java:
package mainalee_jsp;
class testclass {
     int age;
     String name;
public void testclass (int x, String y){
     age =x;     name=y;
public String getName(){
     return name;
public int getAge(){
     return age;
jsp1.jsp:
<%@ page import="mainalee_jsp.*" %>
<%
testclass tc = new testclass(27,"XYZ");
out.println(tc.age);
out.println("<br>");
out.println(tc.name);
%>
web.xml:
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
</web-app>
When the jsp is called, Tomcat says that package mainalee_jsp doesn't exist.
How can I make this program work? Thanks for the help to JSP newbie.

Using a JavaBean in JSP

Hello,
I am very new at this, and I am doing a very simple tutorial to use a JavaBean in JSP. I have followed all the procedures from my tutorial, and I get the following error:
org.apache.jasper.JasperException: Can't find a method to write property 'make' of type 'java.lang.String' in a bean of type 'com.wrox.cars.CarBean'
I have the bean:
package com.wrox.cars;
import java.io.Serializable;
public class CarBean implements Serializable {
private String make = "Ford";
public CarBean(){
public String getMake(){
return make;
public void SetMake(String make)
this.make = make;
and the JSP:
<jsp:useBean id="myCar" class="com.wrox.cars.CarBean" />
I have a <jsp:getProperty name="myCar" property="make" /><br>
<jsp:setProperty name="myCar" property="make" value="Ferrari" />
Now I have a <jsp:getProperty name="myCar" property="make" /><br>
The only thing I am missing is this step, where I have been looking for these JAR files and can't find them
I have downloaded many JSTL libraries, and still can't find them/
- dom.jar
- jaxp-api.jar
- jdbc2_0-stdext.jar
- sax.jar
- xalan.jar
- xercesImpl.jar
I really appreciate any help.

Thanks a lot.
Although I should know that, it seems that the error was in the tutorial.
Thanks again,

Using return statement in jsp

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