Java webstart max-heap-size导致JVM无法启动 [英] Java webstart max-heap-size causes JVM cannot be started
问题描述
我们在客户端使用java webstart来实现基于java swing的应用程序。最近，当点击jnlp链接时，我们遇到了一个奇怪的无法启动java虚拟机错误。
We use java webstart on the client side for a java swing based aplication. Recently we have been experiencing a weird "Cannot start java Virtual machine " error when clicking in the jnlp link.
我们很快发现它，因为jnlp文件中的max-heap-size设置设置为1024m，而大多数客户端PC只有1 gb物理内存。将max-heap-size设置回512m解决了问题。
目前，jnlp文件中的相关行看起来像
We soon find out its because the max-heap-size setting in the jnlp file was set to 1024m whereas most of the clients PC only have 1 gb physical memory. Set the max-heap-size back to 512m solved the problem. Currently, the relevant line in the jnlp file looks like
<j2se version="1.5+" initial-heap-size="100m" max-heap-size="512m"/>
我查看了jnlp规范，但找不到与Java虚拟机问题相关的任何内容。从理论上讲，max-heap-size应该与初始堆大小无关。但我们的经验表明情况恰恰相反。
I looked into the jnlp spec, but cannot find anything related to the "Java Virtual machine" issue. In theory the max-heap-size should not matter as much as the initial-heap-size. But our experience suggested quite the contrary.
客户端环境：
Windows XP SP2（32位），互联网Explorer 8.06，内存1G
注意max-heap-size设置为1024m可能会导致2G内存机器出现同样的问题。
Windows XP SP2 ( 32bit ), Internet Explorer 8.06, Memory 1G Note max-heap-size set to 1024m can cause the same problem on a machine with 2G ram.
基本上，我在这里寻找的是关于为什么会发生这种情况的一些参考/规范/经验，以及除了增加物理内存大小。
Basically, what I am looking for here is some reference/spec/experience about why this is happening, and if there is any get-round for this issue besides increasing the physical memory size.
另一件事是，如果我们不指定max-heap-size，那么将实际的物理内存大小用作max-heap-size，还是系统 - 将使用默认值？
Another thing is that if we leave the max-heap-size unspecified, will the actual physical memory size be used as the max-heap-size, or a system-default one will be used?
谢谢，
JasonW
Thanks, JasonW
推荐答案
这个问题很可能是因为无法将足够大的内存区域分配给JVM。出于实现原因，必须在连续的虚拟地址中分配Java对象堆。
It is likely that this problem is caused by the fact that a sufficiently large memory area could not be allocated to your JVM. The Java object heap has to be allocated in contiguous virtual addresses, for implementation reasons.
我注意到在带有2 Gb RAM的Win XP盒子上，它突破了大约1.5 GB（这个过程取决于每台PC上运行的进程，所以YMMV ）。
I noticed that on a Win XP box with 2 Gb RAM this breaks at around 1.5 GB (this off course varies depending on what processes are running on each PC, so YMMV).
查看以下帖子以获得一些解释：
Checkout the following posts for some explanations:
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