Prob with running 2nd Servlet prog.

Hi,
I am new to Java. Recently I ran my 1st servlet program. I have also run my 2nd servlet program using the following web.xml file:
<?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/j2ee/dtds/web-app_2_3.dtd">
<web-app>
<servlet>
<servlet-name>Brat4</servlet-name>
<servlet-class>Brat4</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Brat4</servlet-name>
<url-pattern>/Brat4</url-pattern>
</servlet-mapping>
</web-app>
However if i change the web.xml to:
<?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/j2ee/dtds/web-app_2_3.dtd">
<web-app>
<servlet>
<servlet-name>Brat4</servlet-name>
<servlet-class>Brat4</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Brat4</servlet-name>
<url-pattern>/Brat4</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>Brat</servlet-name>
<servlet-class>Brat</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Brat</servlet-name>
<url-pattern>/Brat</url-pattern>
</servlet-mapping>
</web-app>
My 2nd servlet Brat4 runs but my 1st servlet Brat doesnt run. Somebody plz guide me about it.
Zulfi.

Example:
<?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/j2ee/dtds/web-app_2_3.dtd">
<web-app>
<servlet>
    <servlet-name>Brat4</servlet-name>
    <servlet-class>Brat4</servlet-class>
</servlet>
<servlet>
    <servlet-name>Brat</servlet-name>
    <servlet-class>Brat</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>Brat4</servlet-name>
    <url-pattern>/Brat4</url-pattern>
</servlet-mapping>
<servlet-mapping>
    <servlet-name>Brat</servlet-name>
    <url-pattern>/Brat</url-pattern>
</servlet-mapping>
</web-app>

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Llisas wrote:
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<HEAD>
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<jsp:setProperty name="quadratic" property="ib" param="b" />
<jsp:setProperty name="quadratic" property="ic" param="c" />
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X2= <%= quad.getDx2( ) %>
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package com.brainysoftware;
import java.io.*;
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int ia;
int ib;
int ic;
String dx1;
String dx2;
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public void setIb(int ii) {
ib=ii;
public int getIc( ) {
return ic;
public void setIc(int ii) {
ic=ii;
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double detA;
double result;
detA= ib*ib -4*ia*ic;
if(detA<0.0)
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else {
result= -ib - Math.sqrt(detA/(2 * ia));
Double Dresult=new Double (result);
return Dresult.toString( );
public String getDx2( ) {
double detA;
double result;
detA= ib*ib -4*ia*ic;
if(detA<0.0)
return "Real Roots not possible";
else {
result= -ib + Math.sqrt(detA/(2 * ia));
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return Dresult.toString( );
my directory structure is given below:
C:\tomcat-5.0.28\jakarta-tomcat-5.0.28\webapps\jsp-examples\WEB-INF\classes\com\
brainysoftware>dir
Volume in drive C has no label.
Volume Serial Number is 4C50-9542
Directory of C:\tomcat-5.0.28\jakarta-tomcat-5.0.28\webapps\jsp-examples\WEB-IN
F\classes\com\brainysoftware
05/22/2005 11:15 PM <DIR> .
05/22/2005 11:15 PM <DIR> ..
05/22/2005 11:18 PM 134 CalculatorBean.java
05/23/2005 12:12 AM 216 Counter.java
05/24/2005 10:48 PM 358 SimpleJavaBean.java
06/14/2005 11:16 PM 1,205 Calculator.java
06/14/2005 11:16 PM 1,323 Calculator.class
06/16/2005 06:44 PM 534 CalculatorBean2.java
06/17/2005 08:53 AM 703 CalculatorBean2.class
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06/17/2005 04:43 PM 834 FileUploadBean.class
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06/18/2005 12:21 PM 1,093 Quadratic.class
14 File(s) 8,827 bytes
2 Dir(s) 8,615,821,312 bytes free
C:\tomcat-5.0.28\jakarta-tomcat-5.0.28\webapps\jsp-examples\WEB-INF\classes\com\
brainysoftware>
The above clearly shows the presence of Bean in the reqd directory but still I am getting an error. Can somebody help me:
Zulfi.

class QuadraticThe class is not public. It is only visible to other classes in the same package as itself, so the servlet (JSP) trying to instantiate and reference it can't see it.
Make it public.

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Which error do you get!
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=========================================
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Attachments:
text file.PNG ‏32 KB
IIOA test45.vi ‏188 KB
table.PNG ‏57 KB

oh...i'm sorry dennis..i almost forget these thing.Here, I attached my vi n PNG file. Actually I put the gauges 4 my data from my waveform.I think it can be linked with signal without any prob.So, I didn't know that this function just a scalar input. So refer to my table2 PNG. the date / time did not run properly n stuck with the first time/date data...thank u very much
Attachments:
IIOA test518.vi ‏247 KB
table21.PNG ‏35 KB

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     org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
     org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
     org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
     java.lang.Thread.run(Thread.java:619)
root cause
java.lang.NoClassDefFoundError: HelloWorld (wrong name: hall/HelloWorld)
     java.lang.ClassLoader.defineClass1(Native Method)
     java.lang.ClassLoader.defineClass(ClassLoader.java:620)
     java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
     org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1847)
     org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:890)
     org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1354)
     org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1233)
     org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
     org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
     org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
     org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
     org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
     java.lang.Thread.run(Thread.java:619)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.18 logs.is there something I did wrong?
Edited by: san_4u on Mar 16, 2009 1:20 AM

root cause
java.lang.NoClassDefFoundError: HelloWorld (wrong name: hall/HelloWorld)Is your servlet contains first line as package hall;If it is there,remove it from the servlet code. And run your program.
If you want to keep it, then make a folder named hall in classes folder and put your HelloWorld.class there. Also change <servlet-class> as
<servlet>
    <servlet-name>HelloWorld</servlet-name>
    <servlet-class>hall.HelloWorld</servlet-class>
</servlet>

Extend my wired Airport Extreme (5th Gen) with a 2nd Wired Airport Extreme (also 5th Gen)

I have a 5th Generation Airport Extreme in my house hard wired directly from my fiber optic provider
Then I have that 5th Generation Airport Extreme hard wired directly to my Desktop Computer in a separate building in my back yard (using an Ethernet Cable run through an underground conduit).
Using that setup, I DO get Wi-Fi for my iPhone 4S & iPad 3 in that separate building in my back yard, but it is sometimes so weak, it really is not useable.
To improve the Wi-Fi signal for my iPhone 4S & iPad 3, I plan on adding a 2nd 5th Generation Airport Extreme in the separate building in my back yard.
I will disconnect the Ethernet Cable that is currently plugged directly into my Desktop computer & plug it into the 2nd Airport Extreme.
Then, I will use a short Ethernet Cable to directly connect my Desktop Computer to the 2nd Airport Extreme.
The desktop computer is an older Dell Dimension 9200 running Windows XP Professional with Service Pack 3
With this set-up, will the strong Wi-Fi signal I now get in my house from the 1st Airport Extreme NOT be reduced?
And since the separate building is only 300 square feet, I assume the Wi-Fi signal there will also be as strong with the 2nd Airport Extreme being so close to everything?
Could someone point me to SPECIFIC instructions on how to CORRECTLY set this up so that the 2nd Airport Extreme will EXTEND my home network?

So, I should unplug the 1st Airport Extreme from the outlet before doing anything?
Yes.
Since the 2 Airport Extremes will be in 2 separate locations, which do I plug into the outlet first?
I would suggest plugging the one in the house first, then the second one in the backyard building. Be sure to connect the Ethernet coming from the first into the second before power-on either base station.
Could I connect the Ethernet both to the 2nd Airport Extreme & then to the desktop, then plug in the current Airport Extreme in the house, then run out & plug in the 2nd Airport Extreme in the separate building?
The key is to leave everything powered-off; connect the Ethernet cables, and then, start by powering up the house unit, then the backyard unit, and then, the PC. Make sense?
P.S. I have the Version 5.5.3 of Airport Utility for Windows (using Windows XP Professional with Service Pack 3)
There does NOT seem to be a later version than that.
That worked great for the installation of the 1st Airport Extreme several months ago, so I shouldn't have any problems, should I?
There is a later version (5.6.1) for Windows, but required Windows 7 to run on. Since you can already administer the 1st 5th gen Extreme with the version you have now, you shouldn't have any issues continuing to use it for the second unit.

Prob with running 2nd Servlet prog.

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