how to solve java.lang.NullPointerException

[vikassawant]

hi,
when I execute following code, I get the java.lang.NullPointerException

try
{

int cnt=0;
for(int i=0;i<d;i++)
{
String s = dpos[i];
String s1 = dpos1[i];
String s2 = dpos2[i];
String s3 = dpos3[i];

if(s.equals("C") || s1.equals("C") || s2.equals("C") || s3.equals("C"))
{
cnt++;
cfn[i] = dfn[i];
cln[i] = dln[i];
cpos[i] = dpos[i];
chr[i] = dhr[i];
crbi[i] = drbi[i];
csb[i] = dsb[i];
cavg[i] = davg[i];
cvalue[i] = dvalue[i];
}

}

for(int c=0;c<cnt;c++)
{
System.out.println("Selected Players for C Position are:"+cfn[c]+" "+cln[c]);
}


}
catch(Exception e)
{
System.out.println("Exception is....."+e);
}

but when I execute above code by making change in only if condition like

if(s.equals("C") )

it works well.But I want to check for all four string.

What mistake is here due to which I get the above exception.

Thanks,
Vikas Sawant.

[JosAH]

In your catch clause change your print statement to "e.printStackTrace()" and you'll see exactly on what line you tried to dereference a null reference.

kind regards,

Jos

[vikassawant]

thanks Jos,

I change exception according to you...
I get the error at same line which I told above... i.e.

if(s.equals("C") || s1.equals("C") || s2.equals("C") || s3.equals("C"))

but when I change this loop like

if(s.equals("C"))

It works.

Please tell me what can I do.

Thanks,
Vikas Sawant.

[JosAH]

@vikassawant
At least one of s1, s2 or s3 are equal to null then. You have to reason 'backwards' in your code and see what caused it. A few System.out.println( ... ) method calls sprinkled in may be of help.

kind regards,

Jos

[r035198x]

There is also a whole article devoted to that exception alone.