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This bill of materials (BOM) POM covers all the Apache HttpClient artifacts related to a particular version. By importing this BOM, you fix the version of all of HttpClient-related artifacts to the versions associated with a particular release. This prevents the overriding of HttpClient transitive dependencies which in turn could cause version conflicts between libraries. To use this BOM, add the following in your POM: <dependencyManagement> <dependencies> <dependency> <groupId>com.covisint.core</groupId> <artifactId>httpclient-bom</artifactId> <version>4.3.2</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement> And then declare your dependency on the HttpClient artifacts *without* a version.