Question: `Integer.parseInt("5")` and `Long.parseLong("5")` are throwing an `UnsupportedOperationException` in the Eclipse Expressions Window.

![Eclipse Environment Screenshot](https://i.stack.imgur.com/d5Yjj.png)

I think this is also the Exception I'm getting at runtime, but being new to Eclipse, I'm not sure how to find the type of `e` within a debug session:

```
public static long longTryParse(String text, long fallbackValue) {
  try {
    return Long.parseLong(text);
  } catch (Exception e) {
    return fallbackValue; // When stopping at a breakpoint here, Eclipse says that e is of type 'Exception'.  Well, that's informative.
  }
}

```

So ... 

1. Are these valid statements?
2. If so, why am I getting an exception?
3. (Of lesser importance) Why won't Eclipse say that e is of type UnsupportedOperationException rather than Exception during my debug session?

Thanks!

Answer: 
> 
> Are these valid statements?
> 
> 
> 

Yes ... taken as Java expressions in the context of a normal Java program. 

In the context of an Eclipse debugger's expression evaluator, I'm not sure. 

> 
> If so, why am I getting an exception?
> 
> 
> 

I don't know for sure, but I suspect that it is something to do with the debugger itself.

* One possibility is that you are using the expression evaluation functionality incorrectly.
* Another possibility is that this is a bug in the Eclipse debugger, or a mismatch between the Eclipse debugger and the debug agent in the JVM.

The one thing that I do know is that the `parseInt` and `parseLong` methods themselves don't throw `UnsupportedOperationException`. (In theory, they could because it is an unchecked exception. But I checked the source code for those 2 methods, and there's no way that the code could do that ... if executed in the normal way.)

---

The Google query - "site:eclipse.org +UnsupportedOperationException JDI" - shows a lot of hits in the Eclipse issues database and newsgroups / mailing lists.

In some cases, it looks like the problem is that the JDI / JNDI implementation for the target platform is incomplete. Could this be your problem? You mention you are doing Android development ...
Exception is the declared type of `e` and that is what is normally displayed in the tooltip in Java perspective. If eclipse doesn't tell you more, first make sure you are in debug perspective (not in Java perspective). 

I guess you have a problem with the configuration of eclipse tooltips. You should see more information about the exception in the variable view (if it's not open, try Window/Show View/Variables).

Also, when debugging stops at your breakpoint, you can mark `e` in source and hit CTRL+I (inspect). You should get a popup telling you more about e.

EDIT: This is about finding out more about e. I agree with the earlier posters you cannot normally get an UnsupportedOperationException from your code. Seems like the problem is that debugging is not working correctly.