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[1.7.2] Null Pointer Exception + Ticking Memory Connection

qpwoeiruty
in Modder Support

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Posted

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.

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    Reveal hidden contents

     

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    Add this.isTamed() check at the top your condition. Maybe entity owner is null and you trying to get his name.

  • Quote
      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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