Having trouble trying to implement bucket sort algorithm

Im trying to bucket sort an array and represent the sorting visually with processing functions.
Found this bucket sort code to be rather common used in Java:

``````import java.util.*;
import java.util.Collections;
float[] arr = {23, 4, 67, 1, 90, 54, 21, 50};
int pos1 = -1, pos2 = -1;

void setup()
{
size(600,600);
background(255);
}
void Execute()
{
delay(1000);
BucketSort(arr, arr.length);
}

void draw()
{
background(255);
int N = arr.length;
float base = width/N;

for(int i = 0; i < N; i++)
{
if(i >= pos1 && i <= pos2) fill(0, 0, 255);
else fill(0, 255, 0);

float h = arr[i] * 5;
rect(i*base, height - h, base, h);
}
}
void BucketSort(float arr[], int n)
{
if (n <= 0) return;
Vector<Float>[] buckets = new Vector[n];

for (int i = 0; i < n; i++) {
buckets[i] = new Vector<Float>();
}

for (int i = 0; i < n; i++) {
float idx = arr[i] * n;
}

for (int i = 0; i < n; i++) {
Collections.sort(buckets[i]);
}

int index = 0;
for (int i = 0; i < n; i++) {
for (int j = 0; j < buckets[i].size(); j++) {
arr[index++] = buckets[i].get(j);
}
}
}
``````

but its giving away those errors:

``````java.lang.ArrayIndexOutOfBoundsException: 184
at aula8.BucketSort(aula8.java:63)
at aula8.Execute(aula8.java:34)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at processing.core.PApplet.method(PApplet.java:3867)
at processing.core.PApplet\$2.run(PApplet.java:3905)
``````

can someone explain it to me? im kinda noob in java and processing, it looks like the code is trying to access a number in the array that is out of its bounds, <0 or >8, but I dont understand where the code is trying it.

Normally the line is highlighted that produces the error

Hello,

Processing 4 on W10 PC highlighted where the error is in blue.

I added a `println()` to illustrate the problem:

184 is clearly out of bounds of the 8 element array.

`:)`