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    <blockquote> <p>Is it right that datanucleus-db4o defines its own dependency with a specific version number? Is this a good way?</p> </blockquote> <p>I'm not sure I understood the question... Anyway, there is indeed something wrong with the <code>db4o:db4o</code> dependency of the datanucleus-db4o artifact: it is not available in Maven central nor in the <a href="http://www.datanucleus.org/downloads/maven2" rel="nofollow noreferrer">DataNucleus repository</a>. I don't understand how users are supposed to use the datanucleus-db4o artifact.</p> <blockquote> <p>I downloaded a newer Version of db4o and added it to the classpath. Maven keeps writing about the missing artifact.</p> </blockquote> <p>Not sure what you did exactly but maybe the following will work: exclude the dependency that can't be resolved and replace it with some equivalent from the db4o repository.</p> <pre><code>&lt;dependencies&gt; ... &lt;dependency&gt; &lt;groupId&gt;org.datanucleus&lt;/groupId&gt; &lt;artifactId&gt;datanucleus-db4o&lt;/artifactId&gt; &lt;version&gt;2.1.1&lt;/version&gt; &lt;type&gt;jar&lt;/type&gt; &lt;scope&gt;compile&lt;/scope&gt; &lt;exclusions&gt; &lt;exclusion&gt; &lt;groupId&gt;db4o&lt;/groupId&gt; &lt;artifactId&gt;db4o&lt;/artifactId&gt; &lt;/exclusion&gt; &lt;/exclusions&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;com.db4o&lt;/groupId&gt; &lt;artifactId&gt;db4o-full-java5&lt;/artifactId&gt; &lt;version&gt;7.12-SNAPSHOT&lt;/version&gt; &lt;/dependency&gt; &lt;/dependencies&gt; &lt;repositories&gt; ... &lt;repository&gt; &lt;id&gt;db4o&lt;/id&gt; &lt;url&gt;https://source.db4o.com/maven&lt;/url&gt; &lt;/repository&gt; &lt;/repositories&gt; </code></pre> <p>I have no idea if this will work of course.</p> <blockquote> <p>Also I've got NoClassDefFound errors when I launch my application. This leads me to the other question:</p> </blockquote> <p>Can't say since you didn't post the error. But give the above a try.</p>
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    1. COThx, I solved it now another way. I'll post it now...
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