Null Pointer Exception

[Schandha Ravi]

Hi All,

I'm working with HtmlUnit to test a sample web application. But I'm getting a NullPointerException. I'm not able to figure out where and why the exception is generated.

    
package com.sample;
 
import junit.framework.*;
import com.gargoylesoftware.htmlunit.*;
import com.gargoylesoftware.htmlunit.html.*;
import org.apache.commons.httpclient.*;
import java.net.*;
import java.util.*;
public class SampleTestCase extends TestCase{
private WebClient client=null;
private WebRequestSettings requestSettings=null;
public SampleTestCase(){
super();
}
public SampleTestCase(String args){
super(args);
}
public void setUp() throws Exception{
super.setUp();
WebClient client=new WebClient();

requestSettings=new WebRequestSettings(new URL("http://localhost:7001/SampleWeb"),com.gargoylesoftware.htmlunit.HttpMethod.GET);

}
public void tearDown() throws Exception{
super.tearDown();
}
public void testSample() throws Exception{
List list=new ArrayList();
list.add(new NameValuePair("UserID","RaviCKota"));
list.add(new NameValuePair("Pwd","folklore"));
requestSettings.setRequestParameters(list);
System.out.println(requestSettings.getRequestBody());
WebResponse response=client.loadWebResponse(requestSettings);
if(response==null){
System.out.println("null I got");
}
else
System.out.println("Not null");
System.out.println(response.getContentAsString());
}
}
 

I'm not getting the code displayed under if condition. Can some one guide me here.

[Jeanne Boyarsky]

Schandha,
What line is generating the null pointer? (You can look at the junit report for a stack trace)

[Schandha Ravi]

Hi Jeanne,

From the stack trace, the exception is generated at

    
  com.sample.SampleTestCase.testSample(SampleTestCase.java:34)
 
  and the line 34 is
WebResponse response=client.loadWebResponse(requestSettings)

Not sure why there is an abend. Infact requestSettings is properly intantiated and it has some values. Something went wrong in loadWenResponse

Also I ran the testcase in debug mode, but at the line 34

One more observation is, I'm always getting this exception when ever I call any method on WebClient object. Is the way I initialized WebClient, wrong.

    
package com.sample;
 
import junit.framework.*;
import com.gargoylesoftware.htmlunit.*;
import com.gargoylesoftware.htmlunit.html.*;
import org.apache.commons.httpclient.*;
import java.net.*;
import java.util.*;
public class SampleTestCase extends TestCase{
private WebClient client=null;
private WebRequestSettings requestSettings=null;
public SampleTestCase(){
super();
}
public SampleTestCase(String args){
super(args);
}
public void setUp() throws Exception{
super.setUp();
WebClient client=new WebClient();

requestSettings=new WebRequestSettings(new URL("http://www.google.com"),com.gargoylesoftware.htmlunit.HttpMethod.GET);

}
public void tearDown() throws Exception{
super.tearDown();
}
public void testSample() throws Exception{
List list=new ArrayList();
list.add(new NameValuePair("UserID","RaviCKota"));
list.add(new NameValuePair("Pwd","folklore"));
System.out.println(requestSettings.getUrl().getHost());
//requestSettings.setRequestParameters(list);
[B]WebResponse response = client.getPage(requestSettings).getWebResponse();[/B]
System.out.println(client.getHomePage());
//WebResponse response=client.loadWebResponse(requestSettings);
System.out.println(response.getContentAsString());
}

}
 

[Schandha Ravi]

That was my bad.

I found the mistake. Apparently WebClient object is null. I have the local object created in setUp() which is apparently not available in testcase.

Its fine now.