List.getSize() returns different result when run in Eclipse debugger

I found something strange about an eclipse debugger. First of all, when a program runs as a simple Java Application, everything is ok, but when I use debugger some references become null so that I catch NullPointerException.

Here is much more strange example:

System.out.println("the list size is " + list.getSize());
System.out.println("the list size is " + list.getSize());
System.out.println("the list size is " + list.getSize());
System.out.println("the list size is " + list.getSize());
开发者_JAVA技巧

When I start a program the output is : 50, 50, 50, 50.

But when I use debugger the output is : 50, 49, 48, 47. That is REALLY strange, because getSize() method changes nothing.

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Do you have any custom code in the debugger ("change value" in variables view accepts statements) that might change the list? Like list.remove() as a custom value for some variable?

Also check the "detail formatters" for the variables in the variables view, whether there is some code there for this list or some other variable.

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It's impossible if the list is created just before and with a single threaded application.