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POArray of Objects to be used as Synchronization locks being garbage collected
 

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    <p>Hopefully I'm just making a newbie mistake and someone can point me in the right direction, but here goes:</p> <p>I need to create a collect or array, some sort of organized group of Objects (or anything else that works) to use as synchronization locks for rendering methods. I have been storing an Object[] as a field, and it seems not to like to store data. Oddly enough, I don't have a problem when I set the lock objects as fields in my class, however if I try to use an array like below, they will return null on lock checks.</p> <p>First I initialize my lock array:</p> <pre><code>for(int i=0; i&lt;limit*limit; i++) { vertexbufferlocks[i]=new Object();} </code></pre> <p>Then I call my rendering function: </p> <pre><code>for(int buf=0; buf&lt;limit*limit; buf++){ synchronized(bmem.vertexbufferlocks[buf]){ bindbuffer(vbids[buf]); GL11.glDrawArrays(GL11.GL_QUADS, 0, drawlengths[buf]); }} </code></pre> <p>Which throws: <code>NullPointerException on bmem.vertexbufferlocks[buf]</code> on the line <code>synchronized(bmem.vertexbufferlocks[buf]){</code> I am definately running the constructor loop first. I tried using a LinkedList, List, and HashMap too, same problem. I am only having problems using this particular type, I have other synchronized classes used for data, initialized and read at the same times, which are not being affected.</p> <p>New Details:</p> <p><strong>THIS</strong> model works fine for me, but causes very small visual hitches since I can't render any data while any other data is being modified, all calls are in the same position as before:</p> <p>Init:</p> <pre><code> vertexbufferlock=new Object(); </code></pre> <p>Much later after the whole program is initialized:</p> <pre><code>for(int buf=0; buf&lt;limit*limit; buf++){ synchronized(bmem.vertexbufferlock){ bindbuffer(vbids[buf]); GL11.glDrawArrays(GL11.GL_QUADS, 0, drawlengths[buf]); }} </code></pre> <p>I think the key problem to address here is that my Objects are probably being garbage collected out of my array once the loop finishes.</p>
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    1. COYou sure that `bmem.vertexbufferlocks` is the same array as the `vertexbufferlocks` that was initialized? Maybe that's in another object or something? Another instance of bmem?
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    2. COAlso, it is a better pattern to use `vertexbufferlocks.length` instead of `limit*limit`.
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    3. COHave you verified that `bmem` is not null? There are two places that that line could null pointer. A bit more of your code would be helpful.
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      1. USJames Montagne
 

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