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Editorial Team
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Asked: 2026-06-15T06:53:32+00:00

I am trying to use EqualsBuilder in the apache commons library. So, I downloaded

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I am trying to use EqualsBuilder in the apache commons library. So, I downloaded commons-lang3-3.1.jar from the apache site, and in Eclipse I configured my build path to add it to my set of libraries. I see it listed in my libraries, and if I hit cmd+shift+o it automatically adds this import:

import org.apache.commons.lang3.builder.EqualsBuilder;

However, when I run my application and try to use it, I get:

Could not find class 'org.apache.commons.lang3.builder.EqualsBuilder', referenced from method com.gnychis.awmon.DeviceAbstraction.Interface.equals

Is there something simple I’m missing, here?

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1 Answer

  1. Editorial Team

    Having in build path just satisfies compile time requirement

    You need to add it to your project runtime also (If it is web-app, add it to lib folder)

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