我有一个JSON文档，大小为5MB。但是当我把它压缩后，它变成了144KB。这5MB的文档我保存在couchbase nosql DB中。我把它作为一个REST API公开。当应用程序把couchabse内容放到java RAM中时，我得到了bellow错误。我有16GB的内存，但仍然，只有一个请求，我有时会得到这个错误.Could you please guild me?What are the solutions?
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# There is insufficient memory for the Java Runtime Environment to continue.
# Native memory allocation (mmap) failed to map 470810624 bytes for committing reserved memory.
# An error report file with more information is saved as:
# /home/sanka/IdeaProjects/i/yyy/hs_err_pid3235.log
Java HotSpot(TM) 64-Bit Server VM warning: INFO: os::commit_memory(0x00000006ec600000, 470810624, 0) failed; error='Cannot allocate memory' (errno=12)
日志文件
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# There is insufficient memory for the Java Runtime Environment to continue.
# Native memory allocation (mmap) failed to map 538443776 bytes for committing reserved memory.
# Possible reasons:
# The system is out of physical RAM or swap space
# In 32 bit mode, the process size limit was hit
# Possible solutions:
# Reduce memory load on the system
# Increase physical memory or swap space
# Check if swap backing store is full
# Use 64 bit Java on a 64 bit OS
# Decrease Java heap size (-Xmx/-Xms)
# Decrease number of Java threads
# Decrease Java thread stack sizes (-Xss)
# Set larger code cache with -XX:ReservedCodeCacheSize=
# This output file may be truncated or incomplete.
#
# Out of Memory Error (os_linux.cpp:2640), pid=30646, tid=0x00007f0f1b8f8700
#
# JRE version: Java(TM) SE Runtime Environment (8.0_181-b13) (build 1.8.0_181-b13)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (25.181-b13 mixed mode linux-amd64 compressed oops)
# Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
#