Why am i getting null pointer exception when using map in java?

Question

I am using a Map in java i am getting null pointer exception when i use this if(!GenericValidator.isBlankOrNull(itemsImagesMap.get(item.getuserId()).toString()))

The map does not contain this userId but i have checked !GenericValidator.isBlankOrNull but then also i am getting null pointer exception..

What is MAP? Do you mean java.util.Map? Then, if you nest serveral method invocations without further explanation, it is hard for us to tell what is going on, and which one might cause your NPE. — f_puras
– f_puras, Commented Aug 27, 2012 at 19:06

Cratylus · Accepted Answer · 2012-08-27 18:46:25Z

2

Either item is null and you get the exception since you call getuserId on null or itemsImagesMap.get(item.getuserId()) returns null and you call toString on null

answered Aug 27, 2012 at 18:46

Cratylus

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1 Comment

Cratylus Over a year ago

Just check if(item == null) or if(item.getUserId() == null) to verify

Dan D. · Accepted Answer · 2012-08-27 18:49:12Z

2

You should probably do some checks in your code. Something like:

if (item != null && item.getuserId() != null && itemsImagesMap.get(item.getuserId()) != null) {
  // do the rest of the logic here
}

answered Aug 27, 2012 at 18:49

Dan D.

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Comments

Benj · Accepted Answer · 2012-08-27 19:05:51Z

0

You shoul -really- avoid arm-long lines ;)

Split it into multiple lines, it will be far more easy to debug.

(Sorry, this does not answer the question, but do this and post the result).

Did you put something corresponding to the item.getuserId() key in your map ?

answered Aug 27, 2012 at 19:05

Benj

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