How to use boolean?

I now boolean is a data type that returns either true or false but i dont really know how to use it. Can someone please explain it for me with some common examples or codes would be highly appreaciated?
One more question, how do you use boolean isDigit(char ch) or boolean isLetter(char ch)?
Thanks

public static jePrastevilo(int number){
for(int
int deljitelj=2;deljitelj<number;deljitelj++){
                    if(number%deljitelj==0)
                         return false;
                    else return true;
Why this doesn't work? Retun type required?You need to make sure that the method declares that it is returning a boolean.
i.e. public static boolean jePrastevilo(int number)
Also think about what happens when number is less than 2?

Similar Messages

How to use boolean operator to get count

Hi All,
In my query i need to add a field Count which shows number.
Meaning,
Column A   ColumnB ColumnC Count
100               50            0            2
55                60             76         3
79                0               0           1
meaning from all three column only two has values then Count should show 2. etc....
any suggestion how to use boolean expression here ?
or anyother way to display Count ?
thanks,
KS

Hi thanks for idea.
boolean didnt work here. the formulau sugested worked...
But i wrote formula for the Count --> COUNT("overtime") and for the Count property I selected Calculate Result As --> Summation fo Rounded Values
so the output is as follows:
i had data for 3 payperiods
Count (1st 3 columns)                    overall result(last Column)
200801     200802     200803
1                 0             1                         2
1                1              1                         3
0                1             0                         1
Now the out put i wanted is in the last column -Result column.
I dont want Count column to be display like this. it is showing values instead of total. any this i should change for this?
thanks,
KS

How to use Boolean values from 2 different sources to stop a while loop?

I am working on a program for homework that states E5.4) Using a single Whil eLoop, construct a VI that executes a loop N times or until the user presses a stop button. Be sure to include the Time Delay Exress Vi so the user has time to press the stop botton.
I am doing this right now but it seems as though I can only connect one thing to the stop sign on th while loop. It won't let me connect a comparision of N and the iterations as well as the stop button to the stop sign on the while loop. So how would I be able to structure it so that it stops if it receives a true Boolean value from either of the 2 sources (whichever comes first)?
Basically, I cannot wire the output of the comparison of N and iterations as well as the stop button to the stop button on the whlie loop to end it. Is there a solution?
Thanks!
Solved!
Go to Solution.

Rajster16 wrote:
Using a single Whil eLoop, construct a VI that executes a loop N times or until the user presses a stop button.
Look in the boolean palette for something similar to the word hightlighted in red above.
LabVIEW Champion . Do more with less code and in less time .

How to use boolean transition as trigger 0to1= 1impulse, 1to0= 0 impulse

Hello!
I have a boolean button HVenable which will be used to enable/disable the high voltage output of a voltage source.
The problem:
I only need one True value to send the Open HV command
and one False value to send the Close HV command; the boolean button sends a continuous train of True values when it is on and a continuous train of F values when off.
How can I convert a transition from off to on / F to T into a single 1 impulse or T impulse
and the transition from on to off/ T to F into a single 0 impulse or T impulse.
What instrument converts a transition from F to T into a 1 or T impulse
and a transition from T to F into a 0 impulse (different from the first kind of transition)?
In the attached test vi, such an instrument would be inserted between HVenable button and Select;
when True it will send an open command to visa O 01 CR
when False it will send a close command O 00 CR.
Solved!
Go to Solution.
Attachments:
bultrig.vi ‏11 KB

First, Do Not Use Continuous Run to make code run more than once! Place the repeating code inside a loop. Continuous Run is a troubleshooting tool to be used (sparingly) during development.
The key to your issue is to use the Event structure. A Value Change event on the HVenable boolean will do exactly what you want.
You do not need Type Cast and all the conversions. Set string constants to '\' Codes display mode and enter the data you want.
Lynn
Attachments:
bultrig.2.vi ‏11 KB

How to use boolean push button as a constant to add to other values

Hello all, I am trying to use a boolean OK button and a constant to make something similar to the calculator project I've read about in other posts. I labled the button $1.00, $0.25, ...... So on. I just want to add the value to an indicator every time I push the button.
The closest I can get is the vaue is displayed while I hold the button in and the it goes to 0 as I realese it. I want it to add up each time its pressed.
Thanks in Advance
Kevin
Solved!
Go to Solution.

Hi Kevin, this is Paul from Applications Enginering at NI. Try something like in my attachment. You can use case type statements to evaluate whether a button was pressed, then assign that true case a value. Good luck with it
Paul Davidson
Sound and Vibration Software Staff Product Support Engineer
National Instruments
Attachments:
Dollars and Cents.png ‏20 KB

How to write Boolean function (If Then Else)?

Hi all,
I have a logic to write in the query. It is:
If (A = 0 and B = 0)
Then 0
Else
        If (A = 0 and B > 0)
        Then 100
        Else
               A/B (we want to show %)
How to use boolean function to write this Netted If Else statement? Thank you in advance!

Hi
If (A = 0 and B = 0)
Then 0
Else
If (A = 0 and B > 0)
Then 100
Else
A/B (we want to show %)
1. create a formula in the query designer. and use this formula for if - else
( ( (A==0) AND (B==0) ) * 0) + ( ( a==0 ) AND (B >0 ) * 100 + (A/B*100) )
: denotes THEN
+ : denotes ELSE
See if this works.
Assign points if helpfull
From
ManesH

How to use delay using boolean inputs

dear sir
I have created a AND logic where when both inputs are high using boolean switches output should become high green led should glow after 5seconds and other than it output should be false red led will glow. basically I want to use delay function .I am attaching file
thanking you
regards
kn
Solved!
Go to Solution.
Attachments:
try1.vi ‏8 KB
try.vi ‏38 KB

kavharshre wrote:
sir I am attaching the solution for boolean.Any improvements or suggestions.
First of all, your front panel and diagram are way too big for this VI. Resize them to a reasonable size.
As already mentioned, that "AND TRUE" is just silly.
The upper boolean output of the inner loop is the same for both cases, thus it does not belong in the inner case structure at all.
All you need is a single TRUE diagram constant. Configure the output tunnels to "use default if unwired".
Try to keep your wires straight.
Avoid crossing wires unless necessary
Change the labels of your controls and indicators to something logical and intuitive. Self-documenting!
Here's a literal rewrite.
LabVIEW Champion . Do more with less code and in less time .
Attachments:
try3MOD.vi ‏8 KB

JNI - How to use the error reporting mechanism?

I've developed a C++ DLL which is loaded from a commercial Win32 application (not written by me) as a plug-in for external calculations. On its initialization the C++ DLL launches the Java VM via the JNI invocation interface. When the DLL functions are called by the application, they forward the calls to Java objects inside the Java VM, again via JNI invocation interface.
This works well, but I have encountered a weird error.
From Java I open a JFrame containing a JTextArea as small console for debug output messages. If I turn output to this debug console off (my printToConsole routine checks whether a boolean flag is set), the string concatenation operator may lead to a crash of the Java VM.
For example, if in one of the Java functions called from the
DLL via JNI invocation interface the following is the first statement,
it leads to a crash of the Java VM and the application that loaded the C++ proxy DLL.
String test=""+Math.random(); // String test not used later
Interestingly, if I comment this statement out, the Java code works fine WITHOUT any crash. I've already thought about potential races and synchronization issues in my code, but I don't see where this is the case. And the string concatenation error fails as well, if I insert sleep() statements in front of it and at other places in the code. However, if I turn on log messages printed to my JFrame debug console (containing a JTextArea), the String concatenation works without problems.
So maybe the JNI interface has a bug and affects the Java VM; I don't see where my JNI code is wrong.
One problem is that I do not get any stdout output, as the C++ proxy DLL is loaded by the Windows application, even if I start the Windows application from the DOS command line (under Windows).
Does anyone know how to use the error reporting mechanism?
http://java.sun.com/j2se/1.4.2/docs/guide/vm/error-handling.html
Is it possible that the JVM, when it crashes, writes debug information about the crash into a file instead of stdout/stderr?
My C++ proxy DLL was compiled in debug mode, but the commercial application (which loaded the DLL) is very likely not.
I do not know hot to find the reason why the String concatenation fails inside the Java function called from the C++ DLL via JNI.

Yes, I've initially thought about errors in the C++ code too. But the C++ code is actually very simple and short. It doesn't allocate anything on the C++ side. It allocates a couple of ByteBuffers inside the Java VM however via JNI invocation interface calls of env->NewDirectByteBuffer(). The native memory regions accessed via the ByteBuffers are allocated not by my own C++ code, but by the program that calls my DLL (the program is Metastock).
The interesting thing is that everything works fine if output to my debug console is enabled, which means that in the Java print routine getConsoleLoggingState() returns true and text is appended to the jTextArea.
static synchronized void print(String str)
{ MetaStockMonitor mMon=getInstance();
if ( mMon.getFileLoggingState() && mMon.logFileWriter!=null) {
mMon.logFileWriter.print(str);
mMon.logFileWriter.flush();
if ( mMon.getConsoleLoggingState() ) {
mMon.jTextArea1.append(str);
Only if output to the JTextArea is turned off (ie. getConsoleLoggingState()==false), the crash happens when the FIRST statement in the Java routine called via JNI invocation interface is a (useless) String concatenation operation, as described above.
String test=""+Math.random(); // String test not used later
Moreover, the crash happens BEFORE the allocated ByteBuffer objects are accessed in the Java code. But again, if console output is turned on, it works stable. If console output is turned off, it works when the (useless) String concatenation operation is removed in the Java routine called from C++.
I've already thought about potential races (regarding multiple threads), but this can be ruled out in my case. It almost appears as if the JVM can have problems when called by the invocation interface (I tested it with Java 1.4.2 b28).
All the calls between C++ and Java go ALWAYS in the direction from C++ code to Java. Unfortunately, there is no special JRE version with extensive logging capabilities to facilitate debugging. And the problem is not easily reproducible either.
JNIEnv* JNI_GetEnv()
JNIEnv *env;
cached_jvm->AttachCurrentThread((void**)&env,NULL);
fprintf(logfile,"env=%i\n",env);
fflush(logfile);
return env;
// function called by Metastock's MSX plug-in interface
BOOL __stdcall createIndEngine (const MSXDataRec *a_psDataRec,
const MSXDataInfoRecArgsArray *a_psDataInfoArgs,
const MSXNumericArgsArray *a_psNumericArgs,
const MSXStringArgsArray *a_psStringArgs,
const MSXCustomArgsArray *a_psCustomArgs,
MSXResultRec *a_psResultRec)
a_psResultRec->psResultArray->iFirstValid=0;
a_psResultRec->psResultArray->iLastValid=-1;
jthrowable ex;
jmethodID mid;
JNIEnv* env=JNI_GetEnv();
jobject chart=getChart(env, a_psDataRec);
if ( chart==NULL) {
return MSX_ERROR;
jobject getChart (JNIEnv* env, const MSXDataRec *a_psDataRec)
jthrowable ex;
jmethodID mid;
int closeFirstValid, closeLastValid;
closeFirstValid=a_psDataRec->sClose.iFirstValid;
closeLastValid=a_psDataRec->sClose.iLastValid;
long firstDate, firstTime;
if (closeFirstValid>=1 && closeFirstValid<=closeLastValid) {
firstDate = a_psDataRec->psDate[closeFirstValid].lDate;
firstTime = a_psDataRec->psDate[closeFirstValid].lTime;
} else {
firstDate=0;
firstTime=0;
jclass chartFactoryClass = env->FindClass("wschwendt/metastock/msx/ChartFactory");
if (ex= env->ExceptionOccurred() ) {
env->ExceptionDescribe();
env->ExceptionClear();
sprintf(sbuf, "DLL: Cannot find class ChartFactory\n");
printSBufViaJava(sbuf);
return NULL;
mid = env->GetStaticMethodID(chartFactoryClass, "getInstance", "()Lwschwendt/metastock/msx/ChartFactory;");
if (ex= env->ExceptionOccurred() ) {
env->ExceptionDescribe();
env->ExceptionClear();
sprintf(sbuf, "DLL: Cannot find method ID for ChartFactory.getInstance()\n");
printSBufViaJava(sbuf);
return NULL;
jobject chartFactory=env->CallStaticObjectMethod(chartFactoryClass, mid);
if (ex= env->ExceptionOccurred() ) {
env->ExceptionDescribe();
env->ExceptionClear();
sprintf(sbuf, "DLL: Exception while calling ChartFactory.getInstance()");
printSBufViaJava(sbuf);
return NULL;
mid = env->GetMethodID(chartFactoryClass, "getChartID", "(Ljava/nio/ByteBuffer;Ljava/nio/ByteBuffer;Ljava/nio/ByteBuffer;Ljava/nio/ByteBuffer;IIIIIII)F");
if (ex= env->ExceptionOccurred() ) {
env->ExceptionDescribe();
env->ExceptionClear();
sprintf(sbuf, "DLL: Cannot find method ID for ChartFactory.getChartID()\n");
printSBufViaJava(sbuf);
return NULL;
jobject symbolBuf=env->NewDirectByteBuffer(a_psDataRec->pszSymbol, strlen(a_psDataRec->pszSymbol) );
if (ex= env->ExceptionOccurred() ) {
env->ExceptionDescribe();
env->ExceptionClear();
sprintf(sbuf, "DLL: Cannot allocate symbolBuf\n");
printSBufViaJava(sbuf);
return NULL;
jobject securityNameBuf=env->NewDirectByteBuffer(a_psDataRec->pszSecurityName, strlen(a_psDataRec->pszSecurityName) );
if (ex= env->ExceptionOccurred() ) {
env->ExceptionDescribe();
env->ExceptionClear();
sprintf(sbuf, "DLL: Cannot allocate securityNameBuf\n");
printSBufViaJava(sbuf);
return NULL;
jobject securityPathBuf=env->NewDirectByteBuffer(a_psDataRec->pszSecurityPath, strlen(a_psDataRec->pszSecurityPath) );
if (ex= env->ExceptionOccurred() ) {
env->ExceptionDescribe();
env->ExceptionClear();
sprintf(sbuf, "DLL: Cannot allocate securityPathBuf\n");
printSBufViaJava(sbuf);
return NULL;
jobject securityOnlineSourceBuf=env->NewDirectByteBuffer(a_psDataRec->pszOnlineSource, strlen(a_psDataRec->pszOnlineSource) );
if (ex= env->ExceptionOccurred() ) {
env->ExceptionDescribe();
env->ExceptionClear();
sprintf(sbuf, "DLL: Cannot allocate onlineSourceBuf\n");
printSBufViaJava(sbuf);
return NULL;
// Java Function call leads to crash, if console output is turned off and
// the first statement in the Java routine is a (useless) string concatenation.
// Otherwise it works stable.
jfloat chartID=env->CallFloatMethod(chartFactory, mid, securityNameBuf, symbolBuf,
securityPathBuf, securityOnlineSourceBuf, (jint)(a_psDataRec->iPeriod),
(jint)(a_psDataRec->iInterval), (jint)(a_psDataRec->iStartTime),
(jint)(a_psDataRec->iEndTime), (jint)(a_psDataRec->iSymbolType),
(jint)firstDate, (jint)firstTime );
if (ex= env->ExceptionOccurred() ) {
env->ExceptionDescribe();
env->ExceptionClear();
sprintf(sbuf, "DLL: Exception while calling ChartFactory.getChartID()");
printSBufViaJava(sbuf);
return NULL;

How to use beans in more than one page

hello members,
can somebody tell me how to make beans availabe to more than one page ,i used scope variable as "application"
in which i set the value of java bean and in that page it show all values of that bean even it modified
but when redirect to another jsp page it does not show modifided value,it shows its default value
what shld i use tell me
following thing that i use in forwarded jsp page
<jsp:useBean="same id in previous jsp page", class="same class", scope="application"/>
and then i am using boolean variable which set false default ,but i set it manually though
setfuction (assume) in original jsp page,but in redirected page it showing it value fasle
i don't know why
can somebody (Bean Bond) help me in this problem
i will very thankfull to you
plz..................

My dear friend,
your scope is wrong. Since you run a JSP page and you want it available everywhere, the only thing that all pages have common is session. So changing your bean scope to session will keep the bean variables and the rest you have on it.
Try it and let me know.

How to use the different class for each screen as well as function.

Hi Experts,
How to use the different class for each screen as well as function.
With BestRegards,
M.Thippa Reddy.

Hi ThippaReddy,
see this sample code
Public Class ClsMenInBlack
#Region "Declarations"
    'Class objects
    'UI and Di objects
    Dim objForm As SAPbouiCOM.Form
    'Variables
    Dim strQuery As String
#End Region
#Region "Methods"
    Private Function GeRate() As Double
            Return Double
    End Function
#End Region
Public Sub SBO_Appln_MenuEvent(ByRef pVal As SAPbouiCOM.MenuEvent, ByRef BubbleEvent As Boolean)
        If pVal.BeforeAction = True Then
            If pVal.MenuUID = "ENV_Menu_MIB" Then
            End If
        Else ' Before Action False
            End If
    End Sub
#End Region
End Class
End Class
Rgds
Micheal
Vasu Anna Regional Feeling a???? Just Kidding
Edited by: micheal willis on Jul 27, 2009 5:49 PM
Edited by: micheal willis on Jul 27, 2009 5:50 PM

How to use multiple selection parameters in the data model

Hi, after have looked all the previous threads about how to use multiple selection parameters , I still have a problem;
I'm using Oracle BI Publisher 10.1.3.3.2 and I'm tried to define more than one multiple selection parameters inside the data template;
Inside a simple SQL queries they work perfectly....but inside the data template I have errors.
My data template is the following (it's very simple...I am just testing how the parameters work):
<dataTemplate name="Test" defaultPackage="bip_departments_2_parameters">
<parameters>
<parameter name="p_dep_2_param" include_in_output="false" datatype="character"/>
<parameter name="p_loc_1_param" include_in_output="false" datatype="character"/>
</parameters>
<dataTrigger name="beforeReport" source="bip_departments_2_parameters.beforeReportTrigger"/>
<dataQuery>
<sqlStatement name="Q2">
<![CDATA[
select deptno, dname,loc
from dept
&p_where_clause
]]>
</sqlStatement>
</dataQuery>
<dataStructure>
<group name="G_DEPT" source="Q2">
<element name="deptno" value="deptno"/>
<element name="dname" value="dname"/>
<element name="loc" value="loc"/>
</group>
</dataStructure>
</dataTemplate>
The 2 parameters are based on these LOV:
1) select distinct dname from dept (p_dep_2_param)
2) select distinct loc from dept (p_loc_1_param)
and both of them have checked the "Multiple selection" and "Can select all" boxes
The package I created, in order to use the lexical refence is:
CREATE OR REPLACE package SCOTT.bip_departments_2_parameters
as
p_dep_2_param varchar2(14);
p_loc_1_param varchar2(20);
p_where_clause varchar2(100);
function beforereporttrigger
return boolean;
end bip_departments_2_parameters;
CREATE OR REPLACE package body SCOTT.bip_departments_2_parameters
as
function beforereporttrigger
return boolean
is
l_return boolean := true;
begin
if (p_dep_2_param is not null) --and (p_loc_1_param is not null)
then
p_where_clause := 'where (dname in (' || replace (p_dep_1_param, '''') || ') and loc in (' || replace (p_loc_1_param, '''') || '))';
else
p_where_clause := 'where 1=1';
end if;
return (l_return);
end beforereporttrigger;
end bip_departments_2_parameters;
As you see, I tried to have only one p_where_clause (with more than one parameter inside)....but it doesn't work...
Using only the first parameter (based on deptno (which is number), the p_where_clause is: p_where_clause := 'where (deptno in (' || replace (p_dep_2_param, '''') || '))';
it works perfectly....
Now I don't know if the problem is the datatype, but I noticed that with a single parameter (deptno is number), the lexical refence (inside the data template) works.....with a varchar parameter it doesn't work....
So my questions are these:
1) how can I define the p_where_clause (inside the package) with a single varchar parameter (for example, the department location name)
2) how can I define the p_where_clause using more than one parameter (for example, the department location name and the department name) not number.
Thanks in advance for any suggestion
Alex

Alex,
the missing thing in your example is the fact, that if only one value is selected, the parameter has exact this value like BOSTON. If you choose more than one value, the parameter includes the *'*, so that it looks like *'BOSTON','NEW YORK'*. So you need to check in the package, if there's a *,* in the parameter or not. If yes there's more than one value, if not it's only one value or it's null.
So change your package to (you need to expand your variables)
create or replace package bip_departments_2_parameters
as
p_dep_2_param varchar2(1000);
p_loc_1_param varchar2(1000);
p_where_clause varchar2(1000);
function beforereporttrigger
return boolean;
end bip_departments_2_parameters;
create or replace package body bip_departments_2_parameters
as
function beforereporttrigger
return boolean
is
l_return boolean := true;
begin
p_where_clause := ' ';
if p_dep_2_param is not null then
if instr(p_dep_2_param,',')>0 then
p_where_clause := 'WHERE DNAME in ('||p_dep_2_param||')';
else
p_where_clause := 'WHERE DNAME = '''||p_dep_2_param||'''';
end if;
if p_loc_1_param is not null then
if instr(p_loc_1_param,',')>0 then
p_where_clause := p_where_clause || ' AND LOC IN ('||p_loc_1_param||')';
else
p_where_clause := p_where_clause || ' AND LOC = '''||p_loc_1_param||'''';
end if;
end if;
else
if p_loc_1_param is not null then
if instr(p_loc_1_param,',')>0 then
p_where_clause := p_where_clause || 'WHERE LOC in ('||p_loc_1_param||')';
else
p_where_clause := p_where_clause || 'WHERE LOC = '''||p_loc_1_param||'''';
end if;
end if;
end if;
return (l_return);
end beforereporttrigger;
end bip_departments_2_parameters;
I've written a similar example at http://www.oracle.com/global/de/community/bip/tipps/Dynamische_Queries/index.html ... but it's in german.
Regards
Rainer

How to use methods when objects stored in a linked list?

Hi friend:
I stored a series of objects of certain class inside a linked list. When I get one of them out of the list, I want to use the instance method associated with this object. However, the complier only allow me to treat this object as general object, ( of Object Class), as a result I can't use instance methods which are associated with this object. Can someone tell me how to use the methods associated with the objects which are stored inside a linked list?
Here is my code:
import java.util.*;
public class QueueW
     LinkedList qList;
     public QueueW(Collection s) //Constructor of QuequW Class
          qList = new LinkedList(s); //Declare an object linked list
     public void addWaiting(WaitingList w)
     boolean result = qList.isEmpty(); //true if list contains no elements
          if (result)
          qList.addFirst(w);
          else
          qList.add(w);
     public int printCid()
     Object d = qList.getFirst(); // the complier doesn't allow me to treat d as a object of waitingList class
          int n = d.getCid(); // so I use "Object d"
     return n; // yet object can't use getCid() method, so I got error in "int n = d.getCid()"
     public void removeWaiting(WaitingList w)
     qList.removeFirst();
class WaitingList
int cusmNo;
String cusmName;
int cid;
private static int id_count = 0;
     /* constructor */
     public WaitingList(int c, String cN)
     cusmNo = c;
     cusmName = cN;
     cid = ++id_count;
     public int getCid() //this is the method I want to use
     return cid;

Use casting. In other words, cat the object taken from the collection to the correct type and call your method.
   HashMap map = /* ... */;
   map.put(someKey, myObject);
   ((MyClass)(map.get(someKey)).myMethod();Chuck

How to use a stored procedure in oracle reports

How to use a stored procedure in oracle reports

Dear,
In report triggers you can write your procedure/functions or call it like
function AfterPForm return boolean is
begin
myprocedure(:mydate);
return (TRUE);
end;
Thanks
Jamil

How to use BI in netweaver 2004(trial edition for abap)?

I am new in BI field. I downloaded the netweaver 2004(trial edition for abap)and installed it on my laptop. But the system said I am not authorized to use BI function:(
how can I use it, thank you

Hi Phani,
You can test your TREX server by executing the following step:
Log on to your TREX server and open up the TREX console which you can find in the TREX program folder. Normally you are now inside the python_support folder.
Execute the following script by typing: "python runInstallationText.py" and hit Enter.
The script carries out the following tests:
● Deleting any test indexes that were generated for a previous script run
● Creating a test index
● Indexing documents
● Testing search functions
● Exact, error-tolerant (fuzzy), and linguistic searches
● Search using Boolean operators such as AND and OR
The results are displayed at the end of the script run. You see the tested calls and their statuses (OK or Failed).
When you run the script for the first time, the call Delete Index has the status Failed. This is because there was no existing text index to be deleted. If this is the only cell with the status Failed, the test was successful.
Below you will see the final output generated by the test script. As stated near the bottom of this screenshot our TREX is running very well or not if there is a problem.
Best regards,
Tom.
PS. Don't forget to reward helpfull answers

How to use logic:present tag in struts el tag

Hi
I am trying to use struts el tags in the jsp page.I am struggling with the following exception: Cannot find bean: "result" in any scope.I couldn't understand why this error is coming even i had the property "result" in my ActionForm.
ActionForm:
package com.finocus.cam.struts.bean;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import org.apache.struts.action.ActionError;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionMapping;
import com.finocus.cam.common.ValidateFormat;
public class DetailsForm extends org.apache.struts.action.ActionForm {
     private final static String LOG_TAG = DetailsForm.class.getName() + ".";
     private static final long serialVersionUID = 1L;
     // VARIABLES DECLARATION
     private String name = null;
     private String searchField = null;
     private String searchCriteria = null;
     private String phonenumber = "";
     private String email = "";
     private List results = null;
     private String adminUserName = "";
     private String adminUserEmail = "";
     public DetailsForm() {
     // GETTER AND SETTER METHODS
     public String getName() {
          return name;
     public void setName(String name) {
          this.name = name;
     public String getSearchCriteria() {
          return searchCriteria;
     public void setSearchCriteria(String searchCriteria) {
          this.searchCriteria = searchCriteria;
     public String getSearchField() {
          return searchField;
     public void setSearchField(String searchField) {
          this.searchField = searchField;
     public String getEmail() {
          return email;
     public void setEmail(String email) {
          this.email = email;
     public List getResults() {
          return results;
     public void setResults(List results) {
          this.results = results;
     public String getPhonenumber() {
          return phonenumber;
     public void setPhonenumber(String phonenumber) {
          this.phonenumber = phonenumber;
     public String getAdminUserEmail() {
          return adminUserEmail;
     public void setAdminUserEmail(String adminUserEmail) {
          this.adminUserEmail = adminUserEmail;
     public String getAdminUserName() {
          return adminUserName;
     public void setAdminUserName(String adminUserName) {
          this.adminUserName = adminUserName;
     // DUMPING THE VALUES IN THE CONSOLE
     public void dumpValues() {
          StringBuffer sb = new StringBuffer();
          sb.append("Name'");
          sb.append(name);
          sb.append("SearchField");
          sb.append(searchField);
          sb.append("searchCriteria");
          sb.append(searchCriteria);
          sb.append("'");
          sb.append(" ");
          System.out.println(sb.toString());
     // RESET() METHOD IS USED FOR STORE FORM'S CURRENT VARIABLES DECLARATION
     public void reset(ActionMapping actionMapping, HttpServletRequest request) {
          System.out.println("reset() method is called");
          this.email = null;
          this.searchCriteria = null;
          this.searchField = null;
          this.results = null;
     // VALIDATE() METHOD IS USED TO VALIDATE THE FORM DATA
     public ActionErrors validate(ActionMapping actionMapping,
               HttpServletRequest request) {
          ActionErrors errors = new ActionErrors();
          System.out.println("Validate()is called");
          // Determine if name has been entered.
          if (getName() == null || getName().length() == 0
                    || getName().equals(" ")) {
               errors.add("accountText", new ActionError("searchText.error"));
          } else if ((getSearchField().equals("name") == true)
                    && (ValidateFormat.isValidText(getName()) == false)) {
               errors.add("validAccountName", new ActionError("validName.error"));
          if (getSearchField() == null || getSearchField().length() == 0) {
               errors.add("accountSearchField", new ActionError(
                         "searchField.error"));
          } else if ((getSearchField().equals("email") == true)
                    && (ValidateFormat.isValidEmail(getName()) == false)) {
               errors
                         .add("validAccountEmail", new ActionError(
                                   "validEmail.error"));
          } else if ((getSearchField().equals("phonenumber") == true)
                    && (ValidateFormat.isValidPhoneNoFormat(getName()) == false)) {
               errors.add("validPhoneFormat", new ActionError(
                         "validPhoneFormat.error"));
          if ((getSearchField().equals("searchallfields"))
                    && ((ValidateFormat.isValidText(getName()) == false)
                              && (ValidateFormat.isValidEmail(getName()) == false) && (ValidateFormat
                              .isValidPhoneNoFormat(getName()) == false))) {
               errors.add("validNameEmail",
                         new ActionError("validNameEmail.error"));
          return errors;
Action class:
package com.finocus.cam.struts.action;
import java.util.ArrayList;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import com.finocus.cam.db.CAMDbAccess;
import com.finocus.cam.struts.bean.DetailsForm;
public class DetailsAction extends org.apache.struts.action.Action implements
          com.finocus.cam.common.CAMConstants {
     private final static String LOG_TAG = DetailsAction.class.getName() + ".";
     // Global Forwards
     public static final String GLOBAL_FORWARD_search = "login";
     // Local Forwards
     public static final String SUCCESS_search = "success";
     private boolean dumpRequestParams = true;
     public DetailsAction() {
     public ActionForward execute(ActionMapping mapping, ActionForm form,
               HttpServletRequest request, HttpServletResponse response)
               throws Exception {
          System.out.println("SearchAccount execute() is called");
          HttpSession session = request.getSession(true);
          ArrayList results = null;
          DetailsForm search = (DetailsForm) form;
          String name = search.getName();
          String searchField = search.getSearchField();
          String searchCriteria = search.getSearchCriteria();
          // Dumping the values of input patameters
          if (dumpRequestParams == true) {
               request.setAttribute("SearchCriteria", searchCriteria);
               request.setAttribute("SearchField", searchField);
               request.setAttribute("Text", name);
               search.dumpValues();
          // Perform search based on what criteria and search Field was entered.
          CAMDbAccess dbAccess = CAMDbAccess.getInstance();
          if (null != searchCriteria && searchField != null) {
               System.out.println("Search Criteria =" + searchCriteria
                         + "Selected Option =" + searchField);
               if (searchCriteria.equals(Search_Account) && searchField != null) {
                    results = dbAccess.searchByAccountInfo(name, searchCriteria,
                              searchField);
                    System.out.println(" Search criteria :Exact Match was selected.<BR>");
          // Place search results in SearchForm for access by JSP.
          search.setResults(results);
          // Forward control to this Action's input page.
          return mapping.findForward(SUCCESS_search);
My jsp page:
<%@ taglib uri="/WEB-INF/tld/struts-bean" prefix="bean" %>
<%@ taglib prefix="logic" uri="http://struts.apache.org/tags-logic-el" %>
<%@ taglib uri="/WEB-INF/tld/struts-html" prefix="html" %>
<html:html>
<head>
<title>Search Page</title>
</head>
<body colorants="LightGreen">
     <table width="100%" bgcolor="LightGreen">
          <tr>
               <td align="left"><font color="brown"><h3><b>Search Info</b></h3></font><hr></td>
          </tr>
               <tr>
          <td align="left"><h4><font color="brown"><b>Search Text:</b></font><%=request.getAttribute("Text")%></h4></td>
               </tr><tr>
          <td align="left"><h4><font color="brown"><b>Search Field:</b></font><%=request.getAttribute("SearchField")%></h4></td>
          </tr><tr>
               <td align="left"><h4><font color="brown"><b>Search Criteria:</b></font><%=request.getAttribute("SearchCriteria")%></h4></td>
               </tr><tr>
               <html:form action="/results.do">
                    <td><center><html:submit value="AllSearchOptions " /></center></td>
                    </html:form>
               </tr>
          <tr>
               <td align="left"><font color="brown"><hr><h2><b>Search Results</b></h2></font></td>
          </tr>
          <tr>
          <td>
          <table border="1" cellspacing="1" cellpadding="3" width="70%"
               bgcolor="white">
               <logic:present name="searchbyaccount" property="results">
               Results exists
                    <c:if test="${size==0 }">
               <center><font color="red"><b>No Results Found</b></font></center>
               </c:if>
               <br>
                    <c:if test="${size>0}">
                    Size is greater than ZERO
                         <table border="1" cellspacing="1" cellpadding="3" width="70%"
                              bgcolor="white">
                              <tr>
                                  <th>Customerid</th>
                                   <th>First Name</th>
                                   <th>Last Name</th>
                                   <th>Email</th>
                                   <th>phone Number</th>
                                   <th>Details</th>
                              </tr>
                                   <c:forEach var="result" items="${results}">
                                    <c:out value="${result}"/>
                                   <tr>
                                        <td><bean:write name="result" property="customerid"></bean:write></td>
                                        <td><bean:write name="result"
                                             property="accountAdminFirstName"></bean:write></td>
                                        <td><bean:write name="result"
                                             property="accountAdminLastName" /></td>
                                        <td><bean:write name="result" property="accountability" /></td>
                                        <td><bean:write name="result" property="accountAdminPhone" /></td>
                                        <td><html:form action="/accountDetails.do">
                                                  <html:submit value="Details" />
                                        </html:form></td>
                                   </tr>
                              </c:forEach>
                         </table>
                    </c:if>
          </logic:present>
          </table>
          </td>
          </tr>
     </table>
</body>
</html:html> Please refer me where i done a mistake.Thanks in Advance

hi all,
I am doing programs in sturts. My program
My program purpose is to retrieve data from the
database.My database is MySql. I know that we can
write connection code in Action Class, it is ok for
some less prog's if i want to use the sane connection
code in more Action Classes it is vasting time and
so.I don't think it's a good idea to put database code in Action classes. (That's one of the biggest drawbacks of Struts - it's completely tied to Actions, HTTP, and the Web.) Better to move that code into plain old Java objects and let the Actions call them.
You'll be able to test them without the container or Struts, and you'll be able to reuse those objects in other, non-Web contexts.
So i want to use <data-sources> tag that is available
in struts-config.xml. I know that thre is tag withThis is the wrong place to configure a connection pool, too. Struts should have nothing to do with it. What if you change Web frameworks to WebWork or Spring? The connection pool should be configured in the container that hosts your app, not Struts.
this name, but the problem is i don't know how to use
this tag. If any budy know how to use this please
tell me the syntax or any example.
plese... reply soon..Don't do it. Think about doing it in your container, not Struts.
%

How to use boolean?

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