NullPointerException after checking with if statement

Question

I have the following code:

        Map<BigInteger, AttributeValue> values = getParameters(elementHandler);

        AttributeValue value = values.get(attrID);
        AttributeValue auxValue = null;
        if (auxAttrID != null)
            auxValue = values.get(auxAttrID);

        try {
            if (value == null) {
                // some code here
            }
            if (value != null) {
                assert (value != null) : "value is null";
                if (value.getValue() == null ) {
                    // some code here
                } else if (auxAttrID != null && auxValue != null) {
                    // some code here
                }
            }
        } catch (Exception e) {
            log.error("Error at getting attribute value (attr#" + attrID + ", auxAttrId#" + auxAttrID + ")", e);
        }
        return value;
    }

It produces NullPointerException at line

if (value.getValue() == null )

right after assertion.

AttributeValue is a simple POJO class. Why this happens and how can I fix it?

I think the Exception appears inside the getValue() method. — maja
– maja, Commented Jul 13, 2015 at 8:32
@bmscomp: There's several things guaranteeing that value itself isn't null in that code block. — Makoto
– Makoto, Commented Jul 13, 2015 at 8:34

Community · Accepted Answer · 2017-05-23 11:58:17Z

1

It produces NullPointerException at line if (value.getValue() == null )

if (value != null) {
    //...
    if (value.getValue() == null ) {
        //....

The above if condition states that, value is not NULL when you are invoking value.getValue(). Still you are getting NullPointerException for value.getValue() means the exception is coming from method getValue() (e.g you are trying to access any class attributes with a NULL object etc).

Edit your question with the implementation of getValue().

Use getStackTrace() to find out where the problem occurs. Read this for more information.

edited May 23, 2017 at 11:58

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answered Jul 13, 2015 at 8:39

mazhar islam

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2 Comments

Makoto Over a year ago

Yes, you're not technically wrong, but this much is definitely obvious to us all. It's not really explaining what specifically is causing the NPE, and until we get more information, we don't know that information.

wind_gan Over a year ago

Shame on me. You are right: getValues() method produces NPE.

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