FileChannel的映射不能映射大文件吗？

[纯洁袜子]

//nio文件复制功能
	public static void nioCopy(String infile, String outfile) throws Exception {
		FileInputStream fin = new FileInputStream(infile);
		FileOutputStream fout = new FileOutputStream(outfile);
		FileChannel fcin = fin.getChannel();
		FileChannel fcout = fout.getChannel();
		//运行到这里就报错了
		MappedByteBuffer mbb = fcin.map(FileChannel.MapMode.READ_ONLY, 0, fcin.size()); 
		fcout.write(mbb); 
		fcin.close();
		fcout.close();
		fin.close();
		fout.close();
	}

Exception in thread "main" java.io.IOException: Map failed
at sun.nio.ch.FileChannelImpl.map(FileChannelImpl.java:761)
at mainll4.nioCopy(mainll4.java:41)
at mainll4.main(mainll4.java:22)
Caused by: java.lang.OutOfMemoryError: Map failed
at sun.nio.ch.FileChannelImpl.map0(Native Method)
at sun.nio.ch.FileChannelImpl.map(FileChannelImpl.java:758)
... 2 more

我只是映射一个1GB的文件，就会报错，映射一个5百MB的就不会。