异常OutOfMemoryError：Java堆空间

Question

I want to save a big object

 public void saveGenes() throws FileNotFoundException, IOException{
        String file = "genes.obj";
        String start = String.format("%tr", new Date());
        System.out.println("Save "+file+"...... "+start+"\n");
        ObjectOutputStream oos = new ObjectOutputStream(new     BufferedOutputStream(new FileOutputStream(file)));
        Genes g = new Genes();
        g=this;
        oos.writeObject(g);
        oos.close();
        String end = String.format("%tr", new Date());
        System.out.println("Save Completed......" + end);
    }

But I have to try this error Exception in thread "main" java.lang.OutOfMemoryError: Java heap space at java.io.ObjectOutputStream$HandleTable.growEntries(Unknown Source)

I tested with -Xmx4096M, but the error keeps coming

Answer 1

You could try breaking up the data into smaller parts also you could try calling System.gc() , but in my experience, it does not do any thing. But if it is placed strategically, I've heard that it works.

I don't know any specific reason as to why this is happening.