title: Jenkins error: "ERROR: Unable to install JDK unless a valid username/password is provided."
body: <p>I have added a new slave to my jenkins server, the connection itself seemed to go successfully via ssh, however when I try to build on that server the Job tries to download Java on the slave(even though java is all-ready installed on that server) and im getting the following Error:</p>
  
  <blockquote>
    <p>Downloading JDK from <a href="http://download.oracle.com/otn/java/jdk/8u121-b13/e9e7ea248e2c4826b92b3f075a80e441/jdk-8u121-linux-x64.tar.gz" rel="noreferrer">http://download.oracle.com/otn/java/jdk/8u121-b13/e9e7ea248e2c4826b92b3f075a80e441/jdk-8u121-linux-x64.tar.gz</a>
    Your Oracle account doesn't appear valid. Please specify a valid username/password
    ERROR: Unable to install JDK unless a valid username/password is provided.
    Finished: FAILURE</p>
  </blockquote>
  
  <p>This is the output of java -version</p>
  
  <blockquote>
    <p>openjdk version "1.8.0_131"
    OpenJDK Runtime Environment (build 1.8.0_131-b12)
    OpenJDK 64-Bit Server VM (build 25.131-b12, mixed mode)</p>
  </blockquote>
  
  <p>what do I need to do here? reinstall java manually?</p>