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POInstalling 3rd party JARs within Maven lifecycle vs system scoped dependency
 

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  1. POInstalling 3rd party JARs within Maven lifecycle vs system scoped dependency
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    <p>My project depends on some 3rd-party JARs which are not available in Maven Central.</p> <p>Most information I see regarding this situation, including the official Maven <a href="http://maven.apache.org/guides/mini/guide-3rd-party-jars-local.html" rel="nofollow noreferrer">Guide to installing 3rd party JARs</a>, advises installing the artifact into the local repository using <code>mvn install:install-file ...</code>. This works well when developing locally, but when the build needs to be performed on many different systems in an automated fashion, requiring this manual step is undesirable and impractical.</p> <p>Another solution often presented is to install the dependency into an organization-wide repository, however there are circumstances in which that isn't possible.</p> <p>With neither of those options being acceptable, I can think of two options:</p> <ol> <li>Store the JAR in a lib directory within the project and declare the dependency with a <code>system</code> scope (as suggested in <a href="https://stackoverflow.com/questions/364114/can-i-add-jars-to-maven-2-build-classpath-without-installing-them/364188#364188">several</a> <a href="https://stackoverflow.com/questions/396245/add-a-dependency-in-maven/765032#765032">answers</a>). This would seem to work on any system since the dependency is bundled with the project, but I've seen the use of <code>system</code> discouraged as a bad practice (typically with no more explanation than that).</li> <li>Bind the maven-install-plugin to the <code>initialize</code> lifecycle phase to install the artifact to the local repository. However, as pointed out <a href="https://stackoverflow.com/questions/6571022/is-it-best-to-mavenize-your-project-jar-files-or-put-them-in-web-inf-lib/6592613#6592613">here</a>, this would cause unnecessary overhead as it runs for each and every build. If there were a way to execute this lazily only when the artifact is not installed, that might be ideal.</li> </ol> <p>I would like a standard Maven project that can be built using the regular Maven lifecycle, without any out-of-band "run scripts/init-dependencies first" steps required.</p> <p>What is the best way forward?</p>
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