That could definitely be the issue. Unfortunately, when we move back to a 
previous version of the project we still get the same error so we think it 
might be something with the eclipse environment and are going to try a new 
eclipse install. 

On Monday, May 14, 2018 at 12:34:20 PM UTC-4, Thomas Broyer wrote:
>
> Could one of your dependencies possibly "shadow" its own version of 
> ImageResourceGenerator that had been compiled against GWT 2.8? You'd have 
> to revert to an older version of that dependency then.
>
> On Monday, May 14, 2018 at 3:37:34 PM UTC+2, Rachel wrote:
>>
>> Thank you for responding. I'm looking at the build path and both gwt-user 
>> and gwt-dev jar files are from 2.7. Is there somewhere else I should look?
>>
>> On Monday, May 14, 2018 at 9:16:18 AM UTC-4, Thomas Broyer wrote:
>>>
>>>
>>>
>>> On Monday, May 14, 2018 at 3:06:09 PM UTC+2, Rachel wrote:
>>>>
>>>> We have to move our project back to GWT 2.7 due to some java 1.8 
>>>> issues. I've checked all my jar files to make sure they are 2.7 and no 
>>>> duplicate jars in the build path but am getting errors when I try to 
>>>> compile with Ant.
>>>> Any suggestions would be greatly appreciated. Thank you.
>>>>
>>>> [*java*] Caused by: java.lang.NoSuchMethodError: 
>>>> com.google.gwt.util.tools.Utility.close(Ljava/lang/AutoCloseable;)V
>>>>
>>>> [*java*] at 
>>>> com.google.gwt.resources.rg.ImageResourceGenerator.getContentLength(
>>>> *ImageResourceGenerator.java:623*)
>>>>
>>>
>>> This close(AutoCloseable) method was added in 2.8: 
>>> https://github.com/gwtproject/gwt/commit/349210a31ec593cb499ac73a80743b89bd8d5aac
>>> So this means you have gwt-user from 2.8 and gwt-dev from 2.7 here.
>>>
>>

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