java.lang.OutOfMemoryError

[Luigi Giuri]

I'm having a problem using jdk117_v1a + Apache-JServ-1.0b3.

The problem is that sometimes a java.lang.OutOfMemoryError occurs,
so I need to restart the JVM.

To test the jdk, I wrote the following simple program:


import java.util.*;

public class crashMe
{
  public static void main(String [] argv)
    throws Throwable
  {
    try 
    {
      Vector v = new Vector();
  
      int i = 0;
      while (true)
      {
        v.addElement(
          new StringBuffer(10000));
        System.out.println(++i);
      }
    } catch (Throwable e) {
      System.out.println("Exception!!! Press <Return> to continue...");
      System.in.read();
      throw e;
    }
  }
}


The objective of this program is to fill the computer RAM and swap area but,
suddendly, when it crashes with a java.lang.OutOfMemoryError there are
66000 KB of free RAM (on a 96MB computer).

I tried the jdk117_v3, but I obtained the same result.
I also turned off the JIT compiler.

Here is the command line:

$ /usr/local/jdk117_v3/bin/java -classpath
.:/usr/local/jdk117_v3/lib/classes.zip -Djava.compiler=NONE crashMe

In my computer the above program crashes at iteration n. 525.
If I allocate StringBuffer(1000000) (one million) it crashes after
four iterations.

What's the problem?


Luigi Giuri


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