Eclipse Java条件观察点

Question

Eclipse supports conditional breakpoints which break at a particular line when the condition is true.

It also supports watchpoints which break immediately when a given variable is accessed/modified, regardless of the line that caused the modification.

How would I create a conditional watchpoint such that it breaks at whichever line a given variable is modified AND the condition is true?

For example: set a MODIFY watchpoint on a variable X so that it only breaks when X is set to a value > 1000

EDIT: Say a field can be changed from many different methods, potentially in different packages. One could conceivably create a conditional breakpoint at each of these locations to break when the condition is true. However, the number of places this variable is touched can be numerous and placing that make breakpoints is rather inefficient (from a human standpoint). An alternative is watchpoints which automatically breaks any time the field is modified, regardless of where it was modified from in code. However, I don't know of a way to only have watchpoints break when a condition is met.

Answer 1

在这种情况下，为什么不只创建一个条件断点“ true时暂停”并将其设置为条件

X > 1000 && (your other condition)

Answer 2

I'm not sure if what you want is possible within the breakpoint options or not - however a simple workaround would be:

To add a new variable which holds the origianl value, then use it to create a breakpoint check with your desired affect.

int originalValue = value;

Then inside the breakpoint:

value != originalValue && value > 1000

This breakpoint will then trigger when the value has changed and it is greater than 1000.

EDIT: If you are trying to find the random location within your code where such a change could happen, then there is only one way I would suggest:

Make the variable in question private and force all references to it do go through getter/setter methods. Then you only need to add a breakpoint to the setter method, then you'll very quickly find what you are looking for.