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[1.7.2] Null Pointer Exception + Ticking Memory Connection

qpwoeiruty

By qpwoeiruty
in Modder Support

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qpwoeiruty Creeper Killer

qpwoeiruty

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I have an if statement inside my interact method inside my entity class that is supposed to open a gui but i get these two exceptions but can't figure out the cause:

 

if (par1EntityPlayer.getCommandSenderName().equalsIgnoreCase(this.getOwnerName()) && 
    !this.worldObj.isRemote && !par1EntityPlayer.isSneaking() && 
    itemstack != null && 
    itemstack.getItem() == Item.getItemFromBlock(Blocks.chest) && 
    gear.getStackInSlot(20).getItem() != null) {

     			par1EntityPlayer.openGui(Blocklings.modInstance, 1, this.worldObj, this.getEntityId(), 0, 0);

    }

 

It works fine when there is an item in slot 20 but not when there isn't.

qpwoeiruty Creeper Killer

qpwoeiruty

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shadowmage4513 Creeper Killer

shadowmage4513

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  On 7/16/2014 at 7:11 PM, qpwoeiruty said:

I have an if statement inside my interact method inside my entity class that is supposed to open a gui but i get these two exceptions but can't figure out the cause:

 

if (par1EntityPlayer.getCommandSenderName().equalsIgnoreCase(this.getOwnerName()) && 
    !this.worldObj.isRemote && !par1EntityPlayer.isSneaking() && 
    itemstack != null && 
    itemstack.getItem() == Item.getItemFromBlock(Blocks.chest) && 
    gear.getStackInSlot(20).getItem() != null) {

     			par1EntityPlayer.openGui(Blocklings.modInstance, 1, this.worldObj, this.getEntityId(), 0, 0);

    }

 

It works fine when there is an item in slot 20 but not when there isn't.

 

Your problem is you are checking the stacks ITEM for null, not the stack itself

 

change it to

 

if (gear.getStackInSlot(20)!=null && gear.getStackInSlot(20).getItem()!=null){...}

and you should be fine

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