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.最近我们在点击jnlp链接时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.
我们很快就发现了它，因为 jnlp 文件中的 max-heap-size 设置被设置为 1024m，而大多数客户端 PC 只有 1 GB 的物理内存.将最大堆大小设置回 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.理论上，最大堆大小不应该与初始堆大小一样重要.但我们的经验表明恰恰相反.
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)，Internet Explorer 8.06，内存 1G注意 max-heap-size 设置为 1024m 会在具有 2G ram 的机器上引起同样的问题.
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，我在这里寻找的是一些关于为什么会发生这种情况的参考/规范/经验，以及除了增加物理内存大小之外是否还有解决此问题的方法.
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，实际物理内存大小将用作 max-heap-size，还是使用系统默认大小?
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，贾森
推荐答案
此问题很可能是由于无法为您的 JVM 分配足够大的内存区域造成的.出于实现的原因，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，在具有 2 Gb RAM 的 Win XP 机器上，这会在 1.5 GB 左右中断(当然这取决于每台 PC 上运行的进程，因此 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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