Issue with adding third party library

[althtu 0]

Adding a third party library in a regular project I get normal access as follows:

In my DreamBot project I'm getting the following:

In the second scenario I can access some StringUtils functions (e.g. replace, containsAny, containsNone), but not all of them (such as substringBetween shown in the second image above). My guess would be that client.jar (which is required for a DreamBot project) already has an older version of org.apache.commons.lang3, and that takes precedence when calling StringUtils. How could I avoid this conflict so that all StringUtils functions are available in my DreamBot project?