java.lang.NullPointerException: Attempt to invoke virtual method java.lang.String

Question

I'm trying to use a method to process a String... But I'm getting

java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String kuros.com.ipsiscontroller.stringFilter.setStringParam(java.lang.String)' on a null object reference
        at kuros.com.ipsiscontroller.AddActivity.getParameters(AddActivity.java:147)

stringFilter.class

String setStringParam(String parameter){
        /*String finalParam = "";
        String fillString = "";

            if (parameter.length() < LENGTH_PARAMETERS) {
                int missingChars = LENGTH_PARAMETERS - parameter.length();
                Log.d("STRING_TAG missingChars", String.valueOf(missingChars));
                for (int i = 0; i < missingChars; i++) {
                    //fillString = fillString + "x";
                    fillString += "x";
                }
            }
            finalParam = parameter + fillString;
            Log.d("STRING_TAG", finalParam);*/

        return parameter;
    }

As you can see I commented most on the method just to see I get the same String back... but is not working either. This is line 147.

String test = sf.setStringParam("a");

Are you sure `sf` is not null? – Lawrence Choy May 06 '15 at 05:37 — Lawrence Choy, May 06 '15 at 05:37
What is sf? it seems to be null – SomeJavaGuy May 06 '15 at 05:37 — SomeJavaGuy, May 06 '15 at 05:37
What **is** `sf`? I don't even see it. – EpicPandaForce May 06 '15 at 05:38 — EpicPandaForce, May 06 '15 at 05:38
Make sure that you have created object for sf – VVB May 06 '15 at 05:39 — VVB, May 06 '15 at 05:39
`sf` where is it ? seems `invisible` – Maveňツ May 06 '15 at 05:42 — Maveňツ, May 06 '15 at 05:42
put your complete code here please – Hitesh Singh May 06 '15 at 05:46 — Hitesh Singh, May 06 '15 at 05:46

score -2 · Accepted Answer · answered May 06 '15 at 05:38

-2

That method is not static so you will need an instance of stringFilter to invoke that method.

You are calling an instance method on a null instance of stringFilter

answered May 06 '15 at 05:38

David Pilkington

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java.lang.NullPointerException: Attempt to invoke virtual method java.lang.String

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