java - Replace color of a dye in player's inventory with another -

i replace dye in player's inventory new dye, of different color, example cyan gray.

my plugin changes 1 dye perfectly, when move hotbar, can't drop , when click on in inventory, disappears. in case suppose item not exist.

how can change color of item?

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code:

dye dye = new dye(); dye.setcolor(dyecolor.red);   itemstack dye4 = dye.toitemstack();   dye4.setamount(1); dye.setcolor(dyecolor.orange);   itemstack dye3 = dye.toitemstack();   dye4.setamount(1); dye.setcolor(dyecolor.purple);   itemstack dye2 = dye.toitemstack();   dye4.setamount(1); dye.setcolor(dyecolor.cyan);   itemstack dye1 = dye.toitemstack();   dye4.setamount(1); dye.setcolor(dyecolor.gray);   itemstack dye0 = dye.toitemstack();  arraylist<itemstack> dyes = new arraylist<itemstack>(arrays.aslist(   dye0, dye1, dye2, dye3, dye4 ));  p.getopeninventory().gettopinventory().setitem(1, dyes.get(0)); 

note: i've shortened code example.

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screenshots:

before

after

i moved hotbar - second before disappeared (because didn't click on :d)​

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download

i made example plugin error:

• main file
• example plugin download

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how can fix error?

i have stupid bug in code, didn't set amount of gray dye 1.

final code

dye dye = new dye(); dye.setcolor(dyecolor.red);   itemstack dye4 = dye.toitemstack();   dye4.setamount(1); dye.setcolor(dyecolor.orange);   itemstack dye3 = dye.toitemstack();   dye3.setamount(1); dye.setcolor(dyecolor.purple);   itemstack dye2 = dye.toitemstack();   dye2.setamount(1); dye.setcolor(dyecolor.cyan);   itemstack dye1 = dye.toitemstack();   dye1.setamount(1); dye.setcolor(dyecolor.gray);   itemstack dye0 = dye.toitemstack();   dye0.setamount(1);  immutablelist<itemstack> dyes    = immutablelist.of(dye0, dye1, dye2, dye3, dye4);  p.getopeninventory().gettopinventory().setitem(1, dyes.get(0));