java OutOfMemory时生成java转储
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Generate java dump when OutOfMemory
提问by Andrei Ciobanu
I have a program that should eventually generate OutOfMemory.
The program code is:
我有一个程序应该最终生成OutOfMemory. 程序代码为：
public class VeryLargeObject implements Serializable {
public static final int SIZE = 1 << 12;
public String tag;
public int[][] bigOne = new int[SIZE][SIZE];
{
// Initialize bigOne
for(int i = 0; i < SIZE ; ++i) {
for(int j = 0; j < SIZE; ++j) {
bigOne[i][j] = (int) (Math.random() * 100);
}
}
}
public VeryLargeObject(String tag) {
this.tag = tag;
}
public static void main(String args[]) {
VeryLargeObject[] vla = new VeryLargeObject[1 << 12];
for(int i = 0; i < Integer.MAX_VALUE; ++i) {
vla[i] = new VeryLargeObject("aa");
}
}
}
I run the program with the following parameters:
我使用以下参数运行程序：
java VeryLargeObject -Xms1024m -Xmx1024m -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath="D:\workspace"
The program fails with OutOfMemory but no dump file is generated . Do you have any idea why?
程序因 OutOfMemory 而失败，但没有生成转储文件。你知道为什么吗？
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
at VeryLargeObject.<init>(VeryLargeObject.java:14)
at VeryLargeObject.main(VeryLargeObject.java:32)
回答by Ralph
The problem is that -XX:HeapDumpPathspefies a file and not a path.
问题是-XX:HeapDumpPath指定文件而不是路径。
-Xms1024m -Xmx1024m -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath="c:\temp\dump2.hprof"
added:
添加：
and bestsssis right too, so you need to fix both "errors":
和bestsss是正确的，所以你需要解决两个“错误”：
java -Xms1024m -Xmx1024m -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath="c:\temp\dump2.hprof" VeryLargeObject
回答by bestsss
For starter drop the XX options and any options BEFOREVeryLargeObject, otherwise you pass the parameters to the java program and not the JVM
首先删除 XX 选项和任何选项BEFOREVeryLargeObject，否则您将参数传递给 java 程序而不是 JVM
回答by Peter Lawrey
I suspect the jvm could not write to the path and fails silently. For example, this has to be a file name in a directory which exists. If you have a directory D:\workspaceit will fail. If you have D:\workspace\heap.hprofit may work. Try creating a blank file of that name first to see you can do this.
我怀疑 jvm 无法写入路径并无提示地失败。例如，这必须是存在的目录中的文件名。如果您有目录D:\workspace，它将失败。如果你有D:\workspace\heap.hprof它可能工作。首先尝试创建一个具有该名称的空白文件，看看您是否可以做到这一点。
