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Java编程那些事儿11――JDK的安装、配置和使用
&&& 第二章 建立开发环境
&&& “工欲善其事，必先利其器”。
&&& 进行程序开发，首先要安装开发相关的软件，并且熟悉这些工具软件的基本使用。本章介绍一下两类开发工具的使用：
&&& 基础开发工具
&&& 基础开发工具是进行程序设计的基础，包含开发中需要的一些基本功能，例如编译、运行等，是其它开发工具的基础。
&&& 语言的基本开发工具是SUN公司免费提供的JDK.
&&& 实际开发中，为了方便和程序开发的效率，一般不直接使用基础开发工具，所以对于很多基础开发工具，只需要掌握其基本的使用即可。
&&& 集成开发环境（IDE）
&&& 集成开发环境是指将程序设计需要的很多功能，例如代码编辑、代码调试、程序部署等等一系列功能都整合到一个程序内部，方便程序开发，并提高实际的开发效率，简化了程序设计中的很多操作。
&&& Java语言的集成开发环境很多，常见的有Eclipse、JBuilder、NetBeans等等。
&&& 由于实际开发中，基本都是使用集成开发环境进行开发，所以在学习中必须熟练掌握该类工具的使用。
&&& 一般集成开发环境的使用都很类似，在学习时只要熟练掌握了其中一个的使用，其它的工具学习起来也很简单。
&&& 本文以Eclipse为例来介绍集成开发环境的基本使用。
&&& 2.1 JDK开发环境
&&& JDK（Java Developer‘s Kit），Java开发者工具包，也称J2SDK（Java 2 Software Development Kit），是SUN公司提供的基础Java语言开发工具，该工具软件包含Java语言的编译工具、运行工具以及执行程序的环境（即JRE）。
&&& JDK现在是一个开源、免费的工具。
&&& JDK是其它Java开发工具的基础，也就是说，在安装其它开发工具以前，必须首先安装JDK.对于初学者来说，使用该开发工具进行学习，可以在学习的初期把精力放在Java语言语法的学习上，体会更多底层的知识，对于以后的程序开发很有帮助。
&&& 但是JDK未提供Java源代码的编写环境，这个是SUN提供的很多基础开发工具的通病，所以实际的代码编写还需要在其它的文本编辑器中进行。其实大部分程序设计语言的源代码都是一个文本文件，只是成了不同的后缀名罢了。
&&& 常见的适合Java的文本编辑器有很多，例如JCreator、Editplus、UltraEdit等。
&&& 下面依次来介绍JDK的、安装、配置和使用。
&&& 2.1.1 JDK的获得
&&& 如果需要获得最新版本的JDK，可以到SUN公司的官方网站上进行，地址为：下载最新版本的“JDK 6 Update 6”，选择对应的操作系统，以及使用的语言即可。
&&& 在下载版本时，有两个版本可供下载，，分别是：l
Online Installation在线安装版本，每次安装时都从网络上下载安装程序，在下载完成以后，进行实际的安装。
&&& l Windows Offline Installation离线安装版本，每次安装时直接进行本地安装。
&&& 通常情况下，一般下载离线安装版本。
&&& 其实如果不需要安装最新版本的话，也可以在国内主流的下载站点下载JDK的安装程序，只是这些程序的版本可能稍微老一些，这些对于初学者来说其实问题不大。
【责编:Chuan】
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　Java 频道导航64位windows操作系统下尽量不要使用32位JDK
新产品发布，拿来试用。由于本机是win7_x64，但是为方便工作，机器安装了从32位的JDK1.5一直到64位的JDK1.6的4个JDK。为保证运行时能与大多数人的运行状况相同，依然采用了32位的jdk1.6来运行产品。
结果，我第一次碰到应用服务器刚起来就crash的问题。
生成的JVM的错误日志如下：
# There is insufficient memory for the Java Runtime Environment to continue.&
# Native memory allocation (malloc) failed to allocate 678096 bytes for Chunk::new&
# 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 (allocation.cpp:317), pid=2468, tid=2708&
# JRE version: 6.0_31-b05&
# Java VM: Java HotSpot(TM) Server VM (20.6-b01 mixed mode windows-x86 )&
---------------& T H R E A D& ---------------&
Current thread (0x05f65c00):& JavaThread &C2 CompilerThread1& daemon [_thread_in_native, id=2708, stack(0xx)]&
Stack: [0xx],& sp=0x,& free space=313k&
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)&
[error occurred during error reporting (printing native stack), id 0xc0000005]&
Current CompileTask:&
C2:& &&&&& com.sun.corba.se.impl.corba.TypeCodeImpl.read_value_body(Lorg/omg/CORBA_2_3/portable/InputS)V (1274 bytes)&
---------------& P R O C E S S& ---------------&
Java Threads: ( =& current thread )&
& 0x JavaThread &Idle HTTPHandler-4& [_thread_blocked, id=7344, stack(0x0ex0e370000)]&
& 0x JavaThread &Idle HTTPHandler-3& [_thread_blocked, id=4148, stack(0x0ex0e2e0000)]&
& 0x JavaThread &Idle HTTPHandler-2& [_thread_blocked, id=5736, stack(0x0ex0e250000)]&
& 0x08445c00 JavaThread &Idle ORBWorker-3& [_thread_blocked, id=6876, stack(0x0cx0c4b0000)]&
& 0x JavaThread &Running ORBWorker-2& [_thread_in_vm, id=6612, stack(0x0cx0c380000)]&
& 0x JavaThread &AS-Monitor Sampling Thread: ThreadMonitor& [_thread_blocked, id=7820, stack(0x0cx0c2e0000)]&
& 0x JavaThread &AS-Monitor Sampling Thread: HttpConnectionMonitor& [_thread_blocked, id=7688, stack(0x0cx0c250000)]&
& 0x06fb3c00 JavaThread &AS-Monitor Sampling Thread: DataSourcesMonitor& [_thread_blocked, id=1448, stack(0x0cx0c1c0000)]&
& 0x07ffac00 JavaThread &AS-Monitor Sampling Thread: SessionsMonitor& [_thread_blocked, id=6160, stack(0x0c0ec130000)]&
& 0x07ffa400 JavaThread &AS-Monitor Sampling Thread: JTAMonitor& [_thread_blocked, id=6844, stack(0x0cx0c0a0000)]&
& 0x07ffa000 JavaThread &AS-Monitor Sampling Thread: ClassLoadMonitor& [_thread_blocked, id=7148, stack(0x0bfcc010000)]&
& 0x07ff9800 JavaThread &AS-Monitor Sampling Thread: MemoryMonitor& [_thread_blocked, id=7428, stack(0x0bfbf80000)]&
& 0x07ff9000 JavaThread &p: default- w: Idle& daemon [_thread_blocked, id=4840, stack(0x0b4eb530000)]&
& 0x07ff8c00 JavaThread &p: default- w: Idle& daemon [_thread_blocked, id=6512, stack(0x0bx0b490000)]&
& 0x07ff8400 JavaThread &Thread-19& daemon [_thread_blocked, id=7412, stack(0x0bx0b280000)]&
& 0x07ff8000 JavaThread &JMX server connection timeout 64& daemon [_thread_blocked, id=2176, stack(0x0bx0b1d0000)]&
& 0x07ff7800 JavaThread &p: default- w: Idle& daemon [_thread_blocked, id=7128, stack(0x0bx0b060000)]&
& 0x07ff7400 JavaThread &Idle ORBWorker-1& [_thread_blocked, id=7976, stack(0x0afafb0000)]&
& 0x06fb4800 JavaThread &SelectorThread& daemon [_thread_in_native, id=3124, stack(0x0aecaf10000)]&
& 0x06fb4000 JavaThread &SelectorThread& daemon [_thread_in_native, id=2704, stack(0x0aeae60000)]&
& 0x06fb3400 JavaThread &pool-2-thread-1& [_thread_blocked, id=8036, stack(0x0ax0a960000)]&
& 0x06fb2c00 JavaThread &Idle HTTPHandler-1& [_thread_blocked, id=6600, stack(0x0a7da820000)]&
& 0x06fb2800 JavaThread &HttpReader& [_thread_in_native, id=5532, stack(0x0ax0a790000)]&
& 0x06fb2000 JavaThread &MuxReader& [_thread_in_native, id=6712, stack(0x0a6ba700000)]&
& 0x06fb1c00 JavaThread &AutoDeployer& [_thread_blocked, id=6732, stack(0x0a1da220000)]&
& 0x06fb1400 JavaThread &MongoCleaner& daemon [_thread_blocked, id=4764, stack(0x0ax0a190000)]&
& 0x06fb1000 JavaThread &derby.rawStoreDaemon& daemon [_thread_blocked, id=8008, stack(0x0a0aa0f0000)]&
& 0x06cfc000 JavaThread &Timer-2& daemon [_thread_blocked, id=6484, stack(0x09fea030000)]&
& 0x06cf8000 JavaThread &derby.antiGC& daemon [_thread_blocked, id=3232, stack(0x08fd20000)]&
& 0x06cfb800 JavaThread &RMI TCP Connection(idle)& daemon [_thread_blocked, id=2936, stack(0x09babf0000)]&
& 0x06cfb400 JavaThread &RMI TCP Connection(4)-192.168.0.70& daemon [_thread_blocked, id=7516, stack(0x095f40000)]&
& 0x06cfac00 JavaThread &RMI TCP Connection(idle)& daemon [_thread_blocked, id=5808, stack(0x094d20000)]&
& 0x06cfa800 JavaThread &RMI TCP Connection(2)-192.168.0.70& daemon [_thread_in_native, id=5784, stack(0xx)]&
& 0x06cfa000 JavaThread &JMX server connection timeout 41& daemon [_thread_blocked, id=6264, stack(0xx)]&
& 0x06cf9c00 JavaThread &RMI Scheduler(0)& daemon [_thread_blocked, id=8124, stack(0xx092e0000)]&
& 0x06cf9400 JavaThread &RMI TCP Connection(1)-192.168.0.70& daemon [_thread_in_native, id=8160, stack(0xx)]&
& 0x06cf8800 JavaThread &RMI TCP Accept-0& daemon [_thread_in_native, id=6096, stack(0x091b00000)]&
& 0x06cf7c00 JavaThread &derby.rawStoreDaemon& daemon [_thread_blocked, id=1388, stack(0x08ff90000)]&
& 0x06cf7400 JavaThread &Timer-1& daemon [_thread_blocked, id=3912, stack(0x08ebf00000)]&
& 0x06cf7000 JavaThread &derby.antiGC& daemon [_thread_blocked, id=6244, stack(0x08ee70000)]&
& 0x06cf6000 JavaThread &Idle JMSHandler-4& [_thread_blocked, id=6420, stack(0x07dce10000)]&
& 0x06cf5c00 JavaThread &Idle JMSHandler-3& [_thread_blocked, id=7960, stack(0x07dd80000)]&
& 0x06cf5400 JavaThread &Idle JMSHandler-2& [_thread_blocked, id=2436, stack(0x07cacf0000)]&
& 0x06cf5000 JavaThread &pool-1-thread-5& [_thread_blocked, id=5680, stack(0x07cc60000)]&
& 0x06cf4800 JavaThread &JMSReader& [_thread_in_native, id=5280, stack(0x07bbd0000)]&
& 0x06d50000 JavaThread &pool-1-thread-4& [_thread_blocked, id=5472, stack(0x07afb40000)]&
& 0x06c2bc00 JavaThread &Timer-0& [_thread_blocked, id=5444, stack(0x07aab0000)]&
& 0x06c2b800 JavaThread &pool-1-thread-3& [_thread_blocked, id=5296, stack(0x079da20000)]&
& 0x06c2b000 JavaThread &Running JMSHandler-1& [_thread_blocked, id=7408, stack(0xx)]&
& 0x06c2ac00 JavaThread &HTTPSessionSwapper& [_thread_blocked, id=6828, stack(0x078b00000)]&
& 0x06c77c00 JavaThread &pool-1-thread-2& [_thread_blocked, id=3896, stack(0xx)]&
& 0x JavaThread &Thread-3& [_thread_blocked, id=3180, stack(0xx077e0000)]&
& 0x06d2c400 JavaThread &MuxSecureListener& [_thread_in_native, id=7824, stack(0x076b00000)]&
& 0x06ca2800 JavaThread &MuxListener& [_thread_in_native, id=8040, stack(0x068d20000)]&
& 0x06bf5800 JavaThread &pool-1-thread-1& [_thread_blocked, id=6192, stack(0xx)]&
& 0x06bf5400 JavaThread &LogManager& [_thread_blocked, id=1048, stack(0xx)]&
& 0x05f69400 JavaThread &Low Memory Detector& daemon [_thread_blocked, id=6396, stack(0x063b00000)]&
=&0x05f65c00 JavaThread &C2 CompilerThread1& daemon [_thread_in_native, id=2708, stack(0xx)]&
& 0x05f3d400 JavaThread &C2 CompilerThread0& daemon [_thread_blocked, id=4736, stack(0xx062e0000)]&
& 0x05f3ac00 JavaThread &Attach Listener& daemon [_thread_blocked, id=8056, stack(0xx)]&
& 0x05f32000 JavaThread &Signal Dispatcher& daemon [_thread_blocked, id=6720, stack(0xx061c0000)]&
& 0x027d2c00 JavaThread &Finalizer& daemon [_thread_blocked, id=2296, stack(0x05eef30000)]&
& 0x027d1800 JavaThread &Reference Handler& daemon [_thread_blocked, id=4972, stack(0x05eea0000)]&
& 0x004db800 JavaThread &main& [_thread_blocked, id=716, stack(0xx)]&
Other Threads:&
& 0x027ce800 VMThread [stack: 0x05dce10000] [id=5688]&
& 0x05f72400 WatcherThread [stack: 0xx] [id=7564]&
VM state:not at safepoint (normal execution)&
VM Mutex/Monitor currently owned by a thread: None&
&PSYoungGen&&&&& total 305856K, used 108523K [0x49acfx5f010000)&
& eden space 262208K, 38% used [0x49acfdad0000)&
& from space 43648K, 17% used [0x5cx5cd075d8,0x5f010000)&
& to&& space 43648K, 0% used [0x59adadc570000)&
&PSOldGen&&&&&&& total 699072K, used 11615K [0x1fx49acac0000)&
& object space 699072K, 1% used [0x1fx1fb67c70,0x49ac0000)&
&PSPermGen&&&&&& total 78336K, used 58337K [0x0fx13c9f010000)&
& object space 78336K, 74% used [0x0fxx13c90000)&
Code Cache& [0x027eb2e0000)&
&total_blobs=1388 nmethods=1153 adapters=188 free_code_cache= largest_free_block=29760&
Dynamic libraries:&
0x - 0x&&&& D:\Java\x86\jdk1.6.0_31\bin\java.exe&
0x77cf0000 - 0x77e70000&&&& C:\Windows\SysWOW64\ntdll.dll&
0x74fb0000 - 0x750c0000&&&& C:\Windows\syswow64\kernel32.dll&
0x750c0000 - 0x&&&& C:\Windows\syswow64\KERNELBASE.dll&
0x - 0x752a0000&&&& C:\Windows\syswow64\ADVAPI32.dll&
0x76b60000 - 0x76c0c000&&&& C:\Windows\syswow64\msvcrt.dll&
0x - 0x756a9000&&&& C:\Windows\SysWOW64\sechost.dll&
0x - 0x772f0000&&&& C:\Windows\syswow64\RPCRT4.dll&
0x74f40000 - 0x74fa0000&&&& C:\Windows\syswow64\SspiCli.dll&
0x74f30000 - 0x74f3c000&&&& C:\Windows\syswow64\CRYPTBASE.dll&
0x7c340000 - 0x7c396000&&&& D:\Java\x86\jdk1.6.0_31\jre\bin\msvcr71.dll&
0x6db90000 - 0x6dfe8000&&&& D:\Java\x86\jdk1.6.0_31\jre\bin\server\jvm.dll&
0x766d0000 - 0x767d0000&&&& C:\Windows\syswow64\USER32.dll&
0x752a0000 - 0x&&&& C:\Windows\syswow64\GDI32.dll&
0x - 0x&&&& C:\Windows\syswow64\LPK.dll&
0x76d10000 - 0x76dad000&&&& C:\Windows\syswow64\USP10.dll&
0x767d0000 - 0x&&&& C:\Windows\syswow64\WINMM.dll&
0x76ca0000 - 0x76d00000&&&& C:\Windows\system32\IMM32.DLL&
0x755b0000 - 0x&&&& C:\Windows\syswow64\MSCTF.dll&
0x71ad0000 - 0x71b1c000&&&& C:\Windows\system32\apphelp.dll&
0x72f80000 - 0x72fb2000&&&& C:\Windows\SysWOW64\nvinit.dll&
0x0f000000 - 0x0f006000&&&& C:\Program Files (x86)\NVIDIA Corporation\CoProcManager\_etoured.dll&
0x71a90000 - 0x71acc000&&&& C:\Program Files (x86)\NVIDIA Corporation\CoProcManager\nvd3d9wrap.dll&
0x - 0x758ad000&&&& C:\Windows\syswow64\SETUPAPI.dll&
0x - 0x&&&& C:\Windows\syswow64\CFGMGR32.dll&
0x758b0000 - 0x&&&& C:\Windows\syswow64\OLEAUT32.dll&
0x76db0000 - 0x76f0c000&&&& C:\Windows\syswow64\ole32.dll&
0x - 0x&&&& C:\Windows\syswow64\DEVOBJ.dll&
0x71a50000 - 0x71a8b000&&&& C:\Program Files (x86)\NVIDIA Corporation\CoProcManager\nvdxgiwrap.dll&
0x6d870000 - 0x6d87c000&&&& D:\Java\x86\jdk1.6.0_31\jre\bin\verify.dll&
0x6d3d0000 - 0x6d3ef000&&&& D:\Java\x86\jdk1.6.0_31\jre\bin\java.dll&
0x6d8b0000 - 0x6d8bf000&&&& D:\Java\x86\jdk1.6.0_31\jre\bin\zip.dll&
0x6d6b0000 - 0x6d6c3000&&&& D:\Java\x86\jdk1.6.0_31\jre\bin\net.dll&
0x76c10000 - 0x76c45000&&&& C:\Windows\syswow64\WS2_32.dll&
0x - 0x&&&& C:\Windows\syswow64\NSI.dll&
0x722c0000 - 0x722fc000&&&& C:\Windows\system32\mswsock.dll&
0x713f0000 - 0x713f6000&&&& C:\Windows\System32\wship6.dll&
0x - 0x&&&& C:\Windows\system32\NLAapi.dll&
0x - 0x&&&& C:\Windows\system32\napinsp.dll&
0x - 0x&&&& C:\Windows\system32\pnrpnsp.dll&
0x - 0x722b4000&&&& C:\Windows\system32\DNSAPI.dll&
0x724f0000 - 0x724f8000&&&& C:\Windows\System32\winrnr.dll&
0x003e0000 - 0x003f7000&&&& C:\Program Files (x86)\Common Files\Thunder Network\NetMon\net_monitor2.0.2.7.dll&
0x75a80000 - 0x766ca000&&&& C:\Windows\syswow64\SHELL32.dll&
0x756b0000 - 0x&&&& C:\Windows\syswow64\SHLWAPI.dll&
0x7c3c0000 - 0x7c43c000&&&& C:\Windows\system32\MSVCP71.dll&
0x - 0x&&&& C:\Windows\system32\VERSION.dll&
0x - 0x&&&& C:\Windows\system32\profapi.dll&
0x71bb0000 - 0x71bb5000&&&& C:\Windows\System32\wshtcpip.dll&
0x - 0x&&&& C:\Windows\system32\IPHLPAPI.DLL&
0x - 0x&&&& C:\Windows\system32\WINNSI.DLL&
0x - 0x&&&& C:\Windows\system32\rasadhlp.dll&
0x - 0x&&&& C:\Windows\System32\fwpuclnt.dll&
0x6d600000 - 0x6d609000&&&& D:\Java\x86\jdk1.6.0_31\jre\bin\management.dll&
0x6d6d0000 - 0x6d6d9000&&&& D:\Java\x86\jdk1.6.0_31\jre\bin\nio.dll&
0x6d850000 - 0x6d858000&&&& D:\Java\x86\jdk1.6.0_31\jre\bin\sunmscapi.dll&
0x - 0x&&&& C:\Windows\syswow64\CRYPT32.dll&
0x74fa0000 - 0x74fac000&&&& C:\Windows\syswow64\MSASN1.dll&
0x72f00000 - 0x72f16000&&&& C:\Windows\system32\CRYPTSP.dll&
0x72ec0000 - 0x72efb000&&&& C:\Windows\system32\rsaenh.dll&
0x - 0x&&&& C:\Windows\system32\USERENV.dll&
0x6d370000 - 0x6d38a000&&&& D:\Java\x86\jdk1.6.0_31\jre\bin\instrument.dll&
0x724e0000 - 0x724ed000&&&& C:\Windows\system32\dhcpcsvc6.DLL&
0x - 0x&&&& C:\Windows\system32\dhcpcsvc.DLL&
0x6d7a0000 - 0x6d7a6000&&&& D:\Java\x86\jdk1.6.0_31\jre\bin\rmi.dll&
0x76d00000 - 0x76d05000&&&& C:\Windows\system32\PSAPI.DLL&
0x6d0b0000 - 0x6d1fc000&&&& D:\Java\x86\jdk1.6.0_31\jre\bin\awt.dll&
0x72c60000 - 0x72cb1000&&&& C:\Windows\system32\WINSPOOL.DRV&
0x - 0x&&&& C:\Windows\WinSxS\x86_mon-controls_ccf1df_6.0._none_41ef2b2\COMCTL32.dll&
VM Arguments:&
jvm_args: -Dcom.apusic.domain.home=D:\AAS8.0\AAS\domains\mydomain -Xms1024m -Xmx1024m -XX:MaxPermSize=256m&&
java_command: com.apusic.server.Main -root D:\AAS8.0\AAS&
Launcher Type: SUN_STANDARD&
Environment Variables:&
JAVA_HOME=D:\Java\x86\jdk1.6.0_31&
CLASSPATH=D:\AAS8.0\AAS\D:\AAS8.0\AAS\common\javaee.D:\AAS8.0\AAS\common\jsf-api.D:\AAS8.0\AAS\lib\apusic-client.D:\AAS8.0\AAS\lib\apusic-jms.D:\AAS8.0\AAS\lib\apusic-ws.D:\AAS8.0\AAS\lib\apusic.D:\AAS8.0\AAS\lib\bean-validator.D:\AAS8.0\AAS\lib\deploy.D:\AAS8.0\AAS\lib\elite-api.D:\AAS8.0\AAS\lib\elite.D:\AAS8.0\AAS\lib\firststep.D:\AAS8.0\AAS\lib\jasper-jdt.D:\AAS8.0\AAS\lib\mejb.D:\AAS8.0\AAS\lib\operamasks-impl.D:\AAS8.0\AAS\lib\razor.D:\AAS8.0\AAS\lib\ext\activation.D:\AAS8.0\AAS\lib\ext\bcprov-jdk15-138.D:\AAS8.0\AAS\lib\ext\dsn.D:\AAS8.0\AAS\lib\ext\eclipselink.D:\AAS8.0\AAS\lib\ext\jaxb-impl.D:\AAS8.0\AAS\lib\ext\jaxb-xjc.D:\AAS8.0\AAS\lib\ext\jgroups-all.D:\AAS8.0\AAS\lib\ext\jhall.D:\AAS8.0\AAS\lib\ext\jmxremote.D:\AAS8.0\AAS\lib\ext\jmxremote_optional.D:\AAS8.0\AAS\lib\ext\ldapjdk.D:\AAS8.0\AAS\lib\ext\ldapsp.D:\AAS8.0\AAS\lib\ext\mail.D:\AAS8.0\AAS\lib\ext\operamasks-third-party.D:\AAS8.0\AAS\lib\ext\standard.D:\AAS8.0\AAS\lib\ext\toplink-essentials-agent.D:\AAS8.0\AAS\lib\ext\toplink-essentials.D:\AAS8.0\AAS\lib\ext\xmemcached..;D:\Java\x86\jdk1.6.0_31\lib\tools.D:\Java\x86\jdk1.6.0_31\lib\dt.jar&
PATH=D:\AAS8.0\AAS\D:\Java\x86\jdk1.6.0_31\D:\Java\x86\jdk1.6.0_31\C:\Program Files (x86)\Common Files\NetSC:\Windows\system32;C:\WC:\Windows\System32\WC:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\Lenovo\Access Connections\;D:\MySQL\MySQL Server 5.5\C:\Program Files (x86)\Common Files\Roxio Shared\DLLShared\;D:\Program Files (x86)\QuickTime\QTSystem\;d:\SSH Communications Security\SSH Secure Shell&
USERNAME=mortimer&
OS=Windows_NT&
PROCESSOR_IDENTIFIER=Intel64 Family 6 Model 42 Stepping 7, GenuineIntel&
---------------& S Y S T E M& ---------------&
OS: Windows 7 , 64 bit Build 7601 Service Pack 1&
CPU:total 4 (2 cores per cpu, 2 threads per core) family 6 model 42 stepping 7, cmov, cx8, fxsr, mmx, sse, sse2, sse3, ssse3, sse4.1, sse4.2, popcnt, ht&
Memory: 4k page, physical 24820k free), swap 014064k free)&
vm_info: Java HotSpot(TM) Server VM (20.6-b01) for windows-x86 JRE (1.6.0_31-b05), built on Feb& 3 :56 by &java_re& with MS VC++ 7.1 (VS2003)&
time: Mon Aug 27 15:11:04 2012&
elapsed time: 66 seconds&
# There is insufficient memory for the Java Runtime Environment to continue.
# Native memory allocation (malloc) failed to allocate 678096 bytes for Chunk::new
# 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 (allocation.cpp:317), pid=2468, tid=2708
# JRE version: 6.0_31-b05
# Java VM: Java HotSpot(TM) Server VM (20.6-b01 mixed mode windows-x86 )
---------------& T H R E A D& ---------------
Current thread (0x05f65c00):& JavaThread &C2 CompilerThread1& daemon [_thread_in_native, id=2708, stack(0xx)]
Stack: [0xx],& sp=0x,& free space=313k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
[error occurred during error reporting (printing native stack), id 0xc0000005]
Current CompileTask:
C2:& &&&&& com.sun.corba.se.impl.corba.TypeCodeImpl.read_value_body(Lorg/omg/CORBA_2_3/portable/InputS)V (1274 bytes)
---------------& P R O C E S S& ---------------
Java Threads: ( =& current thread )
& 0x JavaThread &Idle HTTPHandler-4& [_thread_blocked, id=7344, stack(0x0ex0e370000)]
& 0x JavaThread &Idle HTTPHandler-3& [_thread_blocked, id=4148, stack(0x0ex0e2e0000)]
& 0x JavaThread &Idle HTTPHandler-2& [_thread_blocked, id=5736, stack(0x0ex0e250000)]
& 0x08445c00 JavaThread &Idle ORBWorker-3& [_thread_blocked, id=6876, stack(0x0cx0c4b0000)]
& 0x JavaThread &Running ORBWorker-2& [_thread_in_vm, id=6612, stack(0x0cx0c380000)]
& 0x JavaThread &AS-Monitor Sampling Thread: ThreadMonitor& [_thread_blocked, id=7820, stack(0x0cx0c2e0000)]
& 0x JavaThread &AS-Monitor Sampling Thread: HttpConnectionMonitor& [_thread_blocked, id=7688, stack(0x0cx0c250000)]
& 0x06fb3c00 JavaThread &AS-Monitor Sampling Thread: DataSourcesMonitor& [_thread_blocked, id=1448, stack(0x0cx0c1c0000)]
& 0x07ffac00 JavaThread &AS-Monitor Sampling Thread: SessionsMonitor& [_thread_blocked, id=6160, stack(0x0c0ec130000)]
& 0x07ffa400 JavaThread &AS-Monitor Sampling Thread: JTAMonitor& [_thread_blocked, id=6844, stack(0x0cx0c0a0000)]
& 0x07ffa000 JavaThread &AS-Monitor Sampling Thread: ClassLoadMonitor& [_thread_blocked, id=7148, stack(0x0bfcc010000)]
& 0x07ff9800 JavaThread &AS-Monitor Sampling Thread: MemoryMonitor& [_thread_blocked, id=7428, stack(0x0bfbf80000)]
& 0x07ff9000 JavaThread &p: default- w: Idle& daemon [_thread_blocked, id=4840, stack(0x0b4eb530000)]
& 0x07ff8c00 JavaThread &p: default- w: Idle& daemon [_thread_blocked, id=6512, stack(0x0bx0b490000)]
& 0x07ff8400 JavaThread &Thread-19& daemon [_thread_blocked, id=7412, stack(0x0bx0b280000)]
& 0x07ff8000 JavaThread &JMX server connection timeout 64& daemon [_thread_blocked, id=2176, stack(0x0bx0b1d0000)]
& 0x07ff7800 JavaThread &p: default- w: Idle& daemon [_thread_blocked, id=7128, stack(0x0bx0b060000)]
& 0x07ff7400 JavaThread &Idle ORBWorker-1& [_thread_blocked, id=7976, stack(0x0afafb0000)]
& 0x06fb4800 JavaThread &SelectorThread& daemon [_thread_in_native, id=3124, stack(0x0aecaf10000)]
& 0x06fb4000 JavaThread &SelectorThread& daemon [_thread_in_native, id=2704, stack(0x0aeae60000)]
& 0x06fb3400 JavaThread &pool-2-thread-1& [_thread_blocked, id=8036, stack(0x0ax0a960000)]
& 0x06fb2c00 JavaThread &Idle HTTPHandler-1& [_thread_blocked, id=6600, stack(0x0a7da820000)]
& 0x06fb2800 JavaThread &HttpReader& [_thread_in_native, id=5532, stack(0x0ax0a790000)]
& 0x06fb2000 JavaThread &MuxReader& [_thread_in_native, id=6712, stack(0x0a6ba700000)]
& 0x06fb1c00 JavaThread &AutoDeployer& [_thread_blocked, id=6732, stack(0x0a1da220000)]
& 0x06fb1400 JavaThread &MongoCleaner& daemon [_thread_blocked, id=4764, stack(0x0ax0a190000)]
& 0x06fb1000 JavaThread &derby.rawStoreDaemon& daemon [_thread_blocked, id=8008, stack(0x0a0aa0f0000)]
& 0x06cfc000 JavaThread &Timer-2& daemon [_thread_blocked, id=6484, stack(0x09fea030000)]
& 0x06cf8000 JavaThread &derby.antiGC& daemon [_thread_blocked, id=3232, stack(0x08fd20000)]
& 0x06cfb800 JavaThread &RMI TCP Connection(idle)& daemon [_thread_blocked, id=2936, stack(0x09babf0000)]
& 0x06cfb400 JavaThread &RMI TCP Connection(4)-192.168.0.70& daemon [_thread_blocked, id=7516, stack(0x095f40000)]
& 0x06cfac00 JavaThread &RMI TCP Connection(idle)& daemon [_thread_blocked, id=5808, stack(0x094d20000)]
& 0x06cfa800 JavaThread &RMI TCP Connection(2)-192.168.0.70& daemon [_thread_in_native, id=5784, stack(0xx)]
& 0x06cfa000 JavaThread &JMX server connection timeout 41& daemon [_thread_blocked, id=6264, stack(0xx)]
& 0x06cf9c00 JavaThread &RMI Scheduler(0)& daemon [_thread_blocked, id=8124, stack(0xx092e0000)]
& 0x06cf9400 JavaThread &RMI TCP Connection(1)-192.168.0.70& daemon [_thread_in_native, id=8160, stack(0xx)]
& 0x06cf8800 JavaThread &RMI TCP Accept-0& daemon [_thread_in_native, id=6096, stack(0x091b00000)]
& 0x06cf7c00 JavaThread &derby.rawStoreDaemon& daemon [_thread_blocked, id=1388, stack(0x08ff90000)]
& 0x06cf7400 JavaThread &Timer-1& daemon [_thread_blocked, id=3912, stack(0x08ebf00000)]
& 0x06cf7000 JavaThread &derby.antiGC& daemon [_thread_blocked, id=6244, stack(0x08ee70000)]
& 0x06cf6000 JavaThread &Idle JMSHandler-4& [_thread_blocked, id=6420, stack(0x07dce10000)]
& 0x06cf5c00 JavaThread &Idle JMSHandler-3& [_thread_blocked, id=7960, stack(0x07dd80000)]
& 0x06cf5400 JavaThread &Idle JMSHandler-2& [_thread_blocked, id=2436, stack(0x07cacf0000)]
& 0x06cf5000 JavaThread &pool-1-thread-5& [_thread_blocked, id=5680, stack(0x07cc60000)]
& 0x06cf4800 JavaThread &JMSReader& [_thread_in_native, id=5280, stack(0x07bbd0000)]
& 0x06d50000 JavaThread &pool-1-thread-4& [_thread_blocked, id=5472, stack(0x07afb40000)]
& 0x06c2bc00 JavaThread &Timer-0& [_thread_blocked, id=5444, stack(0x07aab0000)]
& 0x06c2b800 JavaThread &pool-1-thread-3& [_thread_blocked, id=5296, stack(0x079da20000)]
& 0x06c2b000 JavaThread &Running JMSHandler-1& [_thread_blocked, id=7408, stack(0xx)]
& 0x06c2ac00 JavaThread &HTTPSessionSwapper& [_thread_blocked, id=6828, stack(0x078b00000)]
& 0x06c77c00 JavaThread &pool-1-thread-2& [_thread_blocked, id=3896, stack(0xx)]
& 0x JavaThread &Thread-3& [_thread_blocked, id=3180, stack(0xx077e0000)]
& 0x06d2c400 JavaThread &MuxSecureListener& [_thread_in_native, id=7824, stack(0x076b00000)]
& 0x06ca2800 JavaThread &MuxListener& [_thread_in_native, id=8040, stack(0x068d20000)]
& 0x06bf5800 JavaThread &pool-1-thread-1& [_thread_blocked, id=6192, stack(0xx)]
& 0x06bf5400 JavaThread &LogManager& [_thread_blocked, id=1048, stack(0xx)]
& 0x05f69400 JavaThread &Low Memory Detector& daemon [_thread_blocked, id=6396, stack(0x063b00000)]
=&0x05f65c00 JavaThread &C2 CompilerThread1& daemon [_thread_in_native, id=2708, stack(0xx)]
& 0x05f3d400 JavaThread &C2 CompilerThread0& daemon [_thread_blocked, id=4736, stack(0xx062e0000)]
& 0x05f3ac00 JavaThread &Attach Listener& daemon [_thread_blocked, id=8056, stack(0xx)]
& 0x05f32000 JavaThread &Signal Dispatcher& daemon [_thread_blocked, id=6720, stack(0xx061c0000)]
& 0x027d2c00 JavaThread &Finalizer& daemon [_thread_blocked, id=2296, stack(0x05eef30000)]
& 0x027d1800 JavaThread &Reference Handler& daemon [_thread_blocked, id=4972, stack(0x05eea0000)]
& 0x004db800 JavaThread &main& [_thread_blocked, id=716, stack(0xx)]
Other Threads:
& 0x027ce800 VMThread [stack: 0x05dce10000] [id=5688]
& 0x05f72400 WatcherThread [stack: 0xx] [id=7564]
VM state:not at safepoint (normal execution)
VM Mutex/Monitor currently owned by a thread: None
&PSYoungGen&&&&& total 305856K, used 108523K [0x49acfx5f010000)
& eden space 262208K, 38% used [0x49acfdad0000)
& from space 43648K, 17% used [0x5cx5cd075d8,0x5f010000)
& to&& space 43648K, 0% used [0x59adadc570000)
&PSOldGen&&&&&&& total 699072K, used 11615K [0x1fx49acac0000)
& object space 699072K, 1% used [0x1fx1fb67c70,0x49ac0000)
&PSPermGen&&&&&& total 78336K, used 58337K [0x0fx13c9f010000)
& object space 78336K, 74% used [0x0fxx13c90000)
Code Cache& [0x027eb2e0000)
&total_blobs=1388 nmethods=1153 adapters=188 free_code_cache= largest_free_block=29760
Dynamic libraries:
0x - 0x &D:\Java\x86\jdk1.6.0_31\bin\java.exe
0x77cf0000 - 0x77e70000 &C:\Windows\SysWOW64\ntdll.dll
0x74fb0000 - 0x750c0000 &C:\Windows\syswow64\kernel32.dll
0x750c0000 - 0x &C:\Windows\syswow64\KERNELBASE.dll
0x - 0x752a0000 &C:\Windows\syswow64\ADVAPI32.dll
0x76b60000 - 0x76c0c000 &C:\Windows\syswow64\msvcrt.dll
0x - 0x756a9000 &C:\Windows\SysWOW64\sechost.dll
0x - 0x772f0000 &C:\Windows\syswow64\RPCRT4.dll
0x74f40000 - 0x74fa0000 &C:\Windows\syswow64\SspiCli.dll
0x74f30000 - 0x74f3c000 &C:\Windows\syswow64\CRYPTBASE.dll
0x7c340000 - 0x7c396000 &D:\Java\x86\jdk1.6.0_31\jre\bin\msvcr71.dll
0x6db90000 - 0x6dfe8000 &D:\Java\x86\jdk1.6.0_31\jre\bin\server\jvm.dll
0x766d0000 - 0x767d0000 &C:\Windows\syswow64\USER32.dll
0x752a0000 - 0x &C:\Windows\syswow64\GDI32.dll
0x - 0x &C:\Windows\syswow64\LPK.dll
0x76d10000 - 0x76dad000 &C:\Windows\syswow64\USP10.dll
0x767d0000 - 0x &C:\Windows\syswow64\WINMM.dll
0x76ca0000 - 0x76d00000 &C:\Windows\system32\IMM32.DLL
0x755b0000 - 0x &C:\Windows\syswow64\MSCTF.dll
0x71ad0000 - 0x71b1c000 &C:\Windows\system32\apphelp.dll
0x72f80000 - 0x72fb2000 &C:\Windows\SysWOW64\nvinit.dll
0x0f000000 - 0x0f006000 &C:\Program Files (x86)\NVIDIA Corporation\CoProcManager\_etoured.dll
0x71a90000 - 0x71acc000 &C:\Program Files (x86)\NVIDIA Corporation\CoProcManager\nvd3d9wrap.dll
0x - 0x758ad000 &C:\Windows\syswow64\SETUPAPI.dll
0x - 0x &C:\Windows\syswow64\CFGMGR32.dll
0x758b0000 - 0x &C:\Windows\syswow64\OLEAUT32.dll
0x76db0000 - 0x76f0c000 &C:\Windows\syswow64\ole32.dll
0x - 0x &C:\Windows\syswow64\DEVOBJ.dll
0x71a50000 - 0x71a8b000 &C:\Program Files (x86)\NVIDIA Corporation\CoProcManager\nvdxgiwrap.dll
0x6d870000 - 0x6d87c000 &D:\Java\x86\jdk1.6.0_31\jre\bin\verify.dll
0x6d3d0000 - 0x6d3ef000 &D:\Java\x86\jdk1.6.0_31\jre\bin\java.dll
0x6d8b0000 - 0x6d8bf000 &D:\Java\x86\jdk1.6.0_31\jre\bin\zip.dll
0x6d6b0000 - 0x6d6c3000 &D:\Java\x86\jdk1.6.0_31\jre\bin\net.dll
0x76c10000 - 0x76c45000 &C:\Windows\syswow64\WS2_32.dll
0x - 0x &C:\Windows\syswow64\NSI.dll
0x722c0000 - 0x722fc000 &C:\Windows\system32\mswsock.dll
0x713f0000 - 0x713f6000 &C:\Windows\System32\wship6.dll
0x - 0x &C:\Windows\system32\NLAapi.dll
0x - 0x &C:\Windows\system32\napinsp.dll
0x - 0x &C:\Windows\system32\pnrpnsp.dll
0x - 0x722b4000 &C:\Windows\system32\DNSAPI.dll
0x724f0000 - 0x724f8000 &C:\Windows\System32\winrnr.dll
0x003e0000 - 0x003f7000 &C:\Program Files (x86)\Common Files\Thunder Network\NetMon\net_monitor2.0.2.7.dll
0x75a80000 - 0x766ca000 &C:\Windows\syswow64\SHELL32.dll
0x756b0000 - 0x &C:\Windows\syswow64\SHLWAPI.dll
0x7c3c0000 - 0x7c43c000 &C:\Windows\system32\MSVCP71.dll
0x - 0x &C:\Windows\system32\VERSION.dll
0x - 0x &C:\Windows\system32\profapi.dll
0x71bb0000 - 0x71bb5000 &C:\Windows\System32\wshtcpip.dll
0x - 0x &C:\Windows\system32\IPHLPAPI.DLL
0x - 0x &C:\Windows\system32\WINNSI.DLL
0x - 0x &C:\Windows\system32\rasadhlp.dll
0x - 0x &C:\Windows\System32\fwpuclnt.dll
0x6d600000 - 0x6d609000 &D:\Java\x86\jdk1.6.0_31\jre\bin\management.dll
0x6d6d0000 - 0x6d6d9000 &D:\Java\x86\jdk1.6.0_31\jre\bin\nio.dll
0x6d850000 - 0x6d858000 &D:\Java\x86\jdk1.6.0_31\jre\bin\sunmscapi.dll
0x - 0x &C:\Windows\syswow64\CRYPT32.dll
0x74fa0000 - 0x74fac000 &C:\Windows\syswow64\MSASN1.dll
0x72f00000 - 0x72f16000 &C:\Windows\system32\CRYPTSP.dll
0x72ec0000 - 0x72efb000 &C:\Windows\system32\rsaenh.dll
0x - 0x &C:\Windows\system32\USERENV.dll
0x6d370000 - 0x6d38a000 &D:\Java\x86\jdk1.6.0_31\jre\bin\instrument.dll
0x724e0000 - 0x724ed000 &C:\Windows\system32\dhcpcsvc6.DLL
0x - 0x &C:\Windows\system32\dhcpcsvc.DLL
0x6d7a0000 - 0x6d7a6000 &D:\Java\x86\jdk1.6.0_31\jre\bin\rmi.dll
0x76d00000 - 0x76d05000 &C:\Windows\system32\PSAPI.DLL
0x6d0b0000 - 0x6d1fc000 &D:\Java\x86\jdk1.6.0_31\jre\bin\awt.dll
0x72c60000 - 0x72cb1000 &C:\Windows\system32\WINSPOOL.DRV
0x - 0x &C:\Windows\WinSxS\x86_mon-controls_ccf1df_6.0._none_41ef2b2\COMCTL32.dll
VM Arguments:
jvm_args: -Dcom.apusic.domain.home=D:\AAS8.0\AAS\domains\mydomain -Xms1024m -Xmx1024m -XX:MaxPermSize=256m
java_command: com.apusic.server.Main -root D:\AAS8.0\AAS
Launcher Type: SUN_STANDARD
Environment Variables:
JAVA_HOME=D:\Java\x86\jdk1.6.0_31
CLASSPATH=D:\AAS8.0\AAS\D:\AAS8.0\AAS\common\javaee.D:\AAS8.0\AAS\common\jsf-api.D:\AAS8.0\AAS\lib\apusic-client.D:\AAS8.0\AAS\lib\apusic-jms.D:\AAS8.0\AAS\lib\apusic-ws.D:\AAS8.0\AAS\lib\apusic.D:\AAS8.0\AAS\lib\bean-validator.D:\AAS8.0\AAS\lib\deploy.D:\AAS8.0\AAS\lib\elite-api.D:\AAS8.0\AAS\lib\elite.D:\AAS8.0\AAS\lib\firststep.D:\AAS8.0\AAS\lib\jasper-jdt.D:\AAS8.0\AAS\lib\mejb.D:\AAS8.0\AAS\lib\operamasks-impl.D:\AAS8.0\AAS\lib\razor.D:\AAS8.0\AAS\lib\ext\activation.D:\AAS8.0\AAS\lib\ext\bcprov-jdk15-138.D:\AAS8.0\AAS\lib\ext\dsn.D:\AAS8.0\AAS\lib\ext\eclipselink.D:\AAS8.0\AAS\lib\ext\jaxb-impl.D:\AAS8.0\AAS\lib\ext\jaxb-xjc.D:\AAS8.0\AAS\lib\ext\jgroups-all.D:\AAS8.0\AAS\lib\ext\jhall.D:\AAS8.0\AAS\lib\ext\jmxremote.D:\AAS8.0\AAS\lib\ext\jmxremote_optional.D:\AAS8.0\AAS\lib\ext\ldapjdk.D:\AAS8.0\AAS\lib\ext\ldapsp.D:\AAS8.0\AAS\lib\ext\mail.D:\AAS8.0\AAS\lib\ext\operamasks-third-party.D:\AAS8.0\AAS\lib\ext\standard.D:\AAS8.0\AAS\lib\ext\toplink-essentials-agent.D:\AAS8.0\AAS\lib\ext\toplink-essentials.D:\AAS8.0\AAS\lib\ext\xmemcached..;D:\Java\x86\jdk1.6.0_31\lib\tools.D:\Java\x86\jdk1.6.0_31\lib\dt.jar
PATH=D:\AAS8.0\AAS\D:\Java\x86\jdk1.6.0_31\D:\Java\x86\jdk1.6.0_31\C:\Program Files (x86)\Common Files\NetSC:\Windows\system32;C:\WC:\Windows\System32\WC:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\Lenovo\Access Connections\;D:\MySQL\MySQL Server 5.5\C:\Program Files (x86)\Common Files\Roxio Shared\DLLShared\;D:\Program Files (x86)\QuickTime\QTSystem\;d:\SSH Communications Security\SSH Secure Shell
USERNAME=mortimer
OS=Windows_NT
PROCESSOR_IDENTIFIER=Intel64 Family 6 Model 42 Stepping 7, GenuineIntel
---------------& S Y S T E M& ---------------
OS: Windows 7 , 64 bit Build 7601 Service Pack 1
CPU:total 4 (2 cores per cpu, 2 threads per core) family 6 model 42 stepping 7, cmov, cx8, fxsr, mmx, sse, sse2, sse3, ssse3, sse4.1, sse4.2, popcnt, ht
Memory: 4k page, physical 24820k free), swap 014064k free)
vm_info: Java HotSpot(TM) Server VM (20.6-b01) for windows-x86 JRE (1.6.0_31-b05), built on Feb& 3 :56 by &java_re& with MS VC++ 7.1 (VS2003)
time: Mon Aug 27 15:11:04 2012
elapsed time: 66 seconds
发生问题以后，再次启动AS，使用jconsole监控，加os的资源管理器查看，一切看起来都非常正常。单单从错误日志来看，是内存不足导致JVM的carsh。
但是，本机有8G内存，运行此应用时，仅仅用了不到3G，试着使用-Xmx加大内存，试着提升到1600M，但是，无法启动，最终定位在1200M，但是，AS依然会在运行一段时间后crash。
接下来就是各种google，有人说这是jdk1.6的bug不过人家的小版本号是25（甚至还有某些号称某电商的人，建议回滚至update24版本），我这是31，难道这个bug一直没有关闭？关于这个问题在StackOverflow有一篇帖子 问题跟我一样，并且采用了各种办法貌似是最终解决了。
楼主在启动时加上了-XX:-DoEscapeAnalysis参数，但是我这依然不可以，这个参数貌似是不再分析可能的溢出，我这只是将crash的时间稍微延后了一些，问题依然没有解决。
再查看此帖的后面，说是降低-Xmx的大小，而且在jvm的崩溃日志中也提到降低-Xmx/Xms的大小，于是试着降低大小，并且把as启动时的jvm参数全部去掉，使用默认值。问题竟然解决了，从目前来看，as运行了半小时依然没有问题（开始时是1分钟以内自动crash）。但是，在实际的生产环境中，JVM默认的参数，往往不能满足需要，因此，就出现一个问题：既然操作系统已经安装64位，并且JDK有64位版本存在，生产环境下尽量在64位的os下安装使用64位jdk，从而把性能发挥至最优。
关于为何要降低jvm堆的大小，有以下说明：
JVM线程堆栈&
应用程序中的每个线程都需要内存来存储器堆栈（用于在调用函数时持有局部变量并维护状态的内存区域）。每个 Java 线程都需要堆栈空间来运行。&
根据实现的不同，Java 线程可以分为本机线程和 Java 堆栈。除了堆栈空间，每个线程还需要为线程本地存储（thread-local storage）和内部数据结构提供一些本机内存。&
JVM堆栈大小&
-Xss 128k：设置每个线程的堆栈大小。JDK5.0以后每个线程堆 栈大小为1M，以前每个线程堆栈大小为256K。更具应用的线程所需内存大小进行调整。&
在相同物理内存下，减小这个值能生成更多的线程。但是操作对一 个进程内的线程数还是有限制的，不能无限生成，经验值在左右。&
JVM heap与JVM私有内存、JVM线程堆栈大小间的关系及平衡。&
线程栈的大小是个双刃剑，如果设置过小，可能会出现栈溢出，特别是在该线程内有递归、大的循环时&
时出现溢出的可能性更大，如果该值设置过大，就有影响到创建栈的数量，如果是多线程的应用，就会&
出现内存溢出的错误．&
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