I thought it was a bug in Nexus, and reported it here: https://support.sonatype.com/hc/en-us/requests/13495?flash_digest=bea6ea417674a0e9c66a0d9d021ecae615c9312e&flash_digest=ee787364221c6b9e7e1aed171997794c060a014e
We use Nexus (currently version 2.11.2-06). We have a pom that is configured to fetch sources JARs, and a job that runs mvn with -U. We expected to see the job download sources JARs that are SNAPSHOTs, but we also see it unexpectedly and unwantedly re-downloading released sources JARs. For example: [INFO] Downloading: <our Nexus server>/nexus/content/groups/qbo/org/apache/axis/axis-saaj/1.4/axis-saaj-1.4-sources.jar [INFO] Downloading: <our Nexus server>/nexus/content/groups/qbo/org/apache/tomcat/tomcat-i18n-fr/7.0.39/tomcat-i18n-fr-7.0.39-sources.jar [INFO] Downloading: <our Nexus server>/nexus/content/groups/qbo/org/jyaml/jyaml/1.3/jyaml-1.3-sources.jar [INFO] Downloading: <our Nexus server>/nexus/content/groups/qbo/net/sf/flatpack/flatpack/3.2.0/flatpack-3.2.0-sources.jar [INFO] Downloading: <our Nexus server>/nexus/content/groups/qbo/com/sun/webservices-extra-api/2.0.1/webservices-extra-api-2.0.1-sources.jar [INFO] Downloading: <our Nexus server>/nexus/content/groups/qbo/com/pingidentity/opentoken/opentoken-adapter/2.3/opentoken-adapter-2.3-sources.jar [INFO] Downloading: <our Nexus server>/nexus/content/groups/qbo/org/grlea/log/adapters/simple-log-sl4j/1.7/simple-log-sl4j-1.7-sources.pom [INFO] Downloading: <our Nexus server>/nexus/content/groups/qbo/gnu-regexp/gnu-regexp/1.1.4/gnu-regexp-1.1.4-sources.jar [INFO] Downloading: <our Nexus server>/nexus/content/groups/qbo/hsqldb/hsqldb/1.8.0.7/hsqldb-1.8.0.7-sources.jar [INFO] Downloading: <our Nexus server>/nexus/content/groups/qbo/xstream/xstream/1.3/xstream-1.3-sources.jar etc. This continual redownloading of sources JARs bogs down our builds (we have a lot of dependencies). But the Nexus support person said: This is not a Nexus issue. If maven request the download of a file, then Nexus will try to provide it. Doing a quick test, I have found that with "-U dependency:sources", maven will download the sources files even if it is locally cached. Removing the "-U", it will use the local copy. Jim Showalter Principal Engineer Intuit, Inc. 2500 Garcia Ave., Building 4 Office 0401028 Mountain View, CA 94043 (650) 944-5788
