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<title>Solving java.net.SocketException: Protocol family unavailable on a Java + Docker + WildFly - Sipmann</title>
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<link rel="alternate" hreflang="pt" href="https://www.sipmann.com/../pt/socketException-protocol-family-unavailable-java-docker-wildfly.html">
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<meta property="article:author" content="Maurício Camargo Sipmann">
<meta name="description" content="Author: Maurício Sipmann, Solving java.net.SocketException when using WildFly with Docker with a simple xml tag">
<meta property="og:description" content="Author: Maurício Sipmann, Solving java.net.SocketException when using WildFly with Docker with a simple xml tag">
<meta property="article:published_time" content=" 2018-03-04 ">
<meta property="article:section" content="Java"> <meta property="article:tag" content="Java"> <meta property="article:tag" content="WildFly"> <meta property="article:tag" content="Docker"> <meta property="article:tag" content="java.net.SocketException"> <meta property="article:tag" content="Protocol family unavailable">
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<h1><b><a href="https://www.sipmann.com/socketException-protocol-family-unavailable-java-docker-wildfly.html" title="Permalink to Solving java.net.SocketException: Protocol family unavailable on a Java + Docker + WildFly">Solving java.net.SocketException: Protocol family unavailable on a Java + Docker + WildFly</a></b></h1>
<h5>
<i class="fa fa-calendar"></i><time class="w3-opacity" datetime="2018-03-04T17:40:00-03:00"> Sun 04 March 2018</time>
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<p><p>On the last days I've been playing with <a class="reference external" href="http://wildfly-swarm.io/">WildFly Swarm</a> and I decided to deploy a simple app with Docker. Should work fine, at least that was what I thought. Built a container with the following Dockerfile and instead of a working web app, all that I got was the error <cite>java.net.SocketException: Protocol family unavailable</cite>.</p>
<div class="highlight"><pre><span></span><span class="k">FROM</span> <span class="s">java:openjdk-8-jdk</span>
<span class="k">COPY</span> target/issues.jar /opt/issues.jar
<span class="k">EXPOSE</span><span class="s"> 8080</span>
<span class="k">CMD</span> <span class="p">[</span><span class="s2">"java"</span><span class="p">,</span><span class="s2">"-jar"</span><span class="p">,</span><span class="s2">"/opt/issues.jar"</span><span class="p">]</span>
</pre></div>
<p>For some reason, WildFly and Java decided to use the IPv6 network interface from Docker instead the v4, so all you have to do is tell Java to prefer IPv4 instead with the following configuration option in your pom.xml file inside your WildFly plugin.</p>
<div class="highlight"><pre><span></span><span class="nt"><plugin></span>
<span class="nt"><groupId></span>org.wildfly.swarm<span class="nt"></groupId></span>
<span class="nt"><artifactId></span>wildfly-swarm-plugin<span class="nt"></artifactId></span>
<span class="nt"><version></span>2018.2.0<span class="nt"></version></span>
<span class="c"><!-- ADD THIS --></span>
<span class="nt"><configuration></span>
<span class="nt"><mainClass></span>org.wildfly.swarm.examples.netflix.ribbon.frontend.Main<span class="nt"></mainClass></span>
<span class="nt"><properties></span>
<span class="nt"><java.net.preferIPv4Stack></span>true<span class="nt"></java.net.preferIPv4Stack></span>
<span class="nt"></properties></span>
<span class="nt"></configuration></span>
</pre></div>
<p>Another way to solve is adding the same properties to the run command at the Dockerfile, so you choose where you'll add it. Bellow the Dockerfile solution.</p>
<div class="highlight"><pre><span></span><span class="k">FROM</span> <span class="s">java:openjdk-8-jdk</span>
<span class="k">ENV</span> <span class="nv">JAVA_OPTS</span><span class="o">=</span><span class="s2">"-Djava.net.preferIPv4Stack=true -Djava.net.preferIPv4Addresses=true"</span>
<span class="k">COPY</span> target/issues.jar /opt/issues.jar
<span class="k">EXPOSE</span><span class="s"> 8080</span>
<span class="k">ENTRYPOINT</span> <span class="nb">exec</span> java <span class="nv">$JAVA_OPTS</span> -jar /opt/issues.jar
</pre></div>
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<h4>Translations:</h4>
<ul>
<li><a href="../pt/socketException-protocol-family-unavailable-java-docker-wildfly.html">pt - Resolvendo java.net.SocketException: Protocol family unavailable em Java + Docker + WildFly</a></li>
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