使用java nio 将超过2G文件映射到内存中，报异常

Question

代码如下：
MappedByteBuffer buffer = FileChannel.map(FileChannel.MapMode.READ_ONLY, 0, Integer.MAX_VALUE);//int java.lang.Integer.MAX_VALUE = 2147483647 [0x7fffffff]

环境：jdk7 64位 操作系统系统win7 64位

异常信息
Exception in thread "main" java.io.IOException: Map failed
at sun.nio.ch.FileChannelImpl.map(FileChannelImpl.java:888)
at com.bigfile.read.MappedBiggerFileReader.(MappedBiggerFileReader.java:36)
at com.bigfile.read.MappedBiggerFileReader.main(MappedBiggerFileReader.java:83)
Caused by: java.lang.OutOfMemoryError: Map failed
at sun.nio.ch.FileChannelImpl.map0(Native Method)
at sun.nio.ch.FileChannelImpl.map(FileChannelImpl.java:885)
... 2 more

Answer 1

out of memory了，内存不够，map失败