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[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building citizens-main 2.0.21-SNAPSHOT
[INFO] ------------------------------------------------------------------------
Downloading: http://repo.citizensnpcs.co/org/bukkit/craftbukkit/1.10-R0.1-SNAPSHOT/maven-metadata.xml
Downloading: http://nexus.theyeticave.net/content/repositories/pub_releases/org/bukkit/craftbukkit/1.10-R0.1-SNAPSHOT/maven-metadata.xml
Downloading: http://repo.bukkit.org/content/groups/public/org/bukkit/craftbukkit/1.10-R0.1-SNAPSHOT/maven-metadata.xml
[WARNING] Could not transfer metadata org.bukkit:craftbukkit:1.10-R0.1-SNAPSHOT/maven-metadata.xml from/to bukkit-repo (http://repo.bukkit.org/content/groups/public/): Error transferring file: Server returned HTTP response code: 521 for URL: http://repo.bukkit.org/content/groups/public/org/bukkit/craftbukkit/1.10-R0.1-SNAPSHOT/maven-metadata.xml
[WARNING] Could not transfer metadata org.bukkit:craftbukkit:1.10-R0.1-SNAPSHOT/maven-metadata.xml from/to vault-repo (http://nexus.theyeticave.net/content/repositories/pub_releases): Error transferring file: nexus.theyeticave.net
Downloading: http://repo.bukkit.org/content/groups/public/org/bukkit/craftbukkit/1.10-R0.1-SNAPSHOT/maven-metadata.xml
Downloading: http://nexus.theyeticave.net/content/repositories/pub_releases/org/bukkit/craftbukkit/1.10-R0.1-SNAPSHOT/maven-metadata.xml
[WARNING] Could not transfer metadata org.bukkit:craftbukkit:1.10-R0.1-SNAPSHOT/maven-metadata.xml from/to bukkit-repo (http://repo.bukkit.org/content/groups/public/): Error transferring file: Server returned HTTP response code: 521 for URL: http://repo.bukkit.org/content/groups/public/org/bukkit/craftbukkit/1.10-R0.1-SNAPSHOT/maven-metadata.xml
[WARNING] Could not transfer metadata org.bukkit:craftbukkit:1.10-R0.1-SNAPSHOT/maven-metadata.xml from/to vault-repo (http://nexus.theyeticave.net/content/repositories/pub_releases): Error transferring file: nexus.theyeticave.net
Downloading: http://repo.bukkit.org/content/groups/public/org/bukkit/bukkit/1.8-R0.1-SNAPSHOT/maven-metadata.xml
Downloading: http://nexus.theyeticave.net/content/repositories/pub_releases/org/bukkit/bukkit/1.8-R0.1-SNAPSHOT/maven-metadata.xml
Downloading: http://repo.citizensnpcs.co/org/bukkit/bukkit/1.8-R0.1-SNAPSHOT/maven-metadata.xml
Downloading: http://nexus.theyeticave.net/content/repositories/pub_releases/org/bukkit/bukkit/1.8-R0.1-SNAPSHOT/maven-metadata.xml
Downloading: https://hub.spigotmc.org/nexus/content/groups/public/org/bukkit/bukkit/1.8-R0.1-SNAPSHOT/maven-metadata.xml
Downloading: https://oss.sonatype.org/content/repositories/snapshots/org/bukkit/bukkit/1.8-R0.1-SNAPSHOT/maven-metadata.xml
Downloading: http://files.krinsoft.net:8085/nexus/content/groups/public/org/bukkit/bukkit/1.8-R0.1-SNAPSHOT/maven-metadata.xml
Downloading: http://dev.escapecraft.com/maven/org/bukkit/bukkit/1.8-R0.1-SNAPSHOT/maven-metadata.xml
Downloaded: https://hub.spigotmc.org/nexus/content/groups/public/org/bukkit/bukkit/1.8-R0.1-SNAPSHOT/maven-metadata.xml (2 KB at 1.6 KB/sec)
[WARNING] Could not transfer metadata org.bukkit:bukkit:1.8-R0.1-SNAPSHOT/maven-metadata.xml from/to bukkit-repo (http://repo.bukkit.org/content/groups/public/): Error transferring file: Server returned HTTP response code: 521 for URL: http://repo.bukkit.org/content/groups/public/org/bukkit/bukkit/1.8-R0.1-SNAPSHOT/maven-metadata.xml
[WARNING] Could not transfer metadata org.bukkit:bukkit:1.8-R0.1-SNAPSHOT/maven-metadata.xml from/to vault-repo (http://nexus.theyeticave.net/content/repositories/pub_releases): Error transferring file: nexus.theyeticave.net
[WARNING] Could not transfer metadata org.bukkit:bukkit:1.8-R0.1-SNAPSHOT/maven-metadata.xml from/to pub-repo (http://nexus.theyeticave.net/content/repositories/pub_releases/): Error transferring file: nexus.theyeticave.net
[WARNING] Could not transfer metadata org.bukkit:bukkit:1.8-R0.1-SNAPSHOT/maven-metadata.xml from/to krinsoft (http://files.krinsoft.net:8085/nexus/content/groups/public): Error transferring file: files.krinsoft.net
[INFO] 
[INFO] --- maven-clean-plugin:2.4.1:clean (default-clean) @ citizens-main ---
[INFO] 
[INFO] --- maven-resources-plugin:2.4.3:resources (default-resources) @ citizens-main ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 6 resources to .
[INFO] 
[INFO] --- maven-compiler-plugin:2.3.2:compile (default-compile) @ citizens-main ---
[INFO] Compiling 120 source files to /var/lib/jenkins/jobs/Citizens2/workspace/main/target/classes
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR : 
[INFO] -------------------------------------------------------------
[ERROR] Unable to locate the Javac Compiler in:
  /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.102-1.b14.el7_2.x86_64/jre/../lib/tools.jar
Please ensure you are using JDK 1.4 or above and
not a JRE (the com.sun.tools.javac.Main class is required).
In most cases you can change the location of your Java
installation by setting the JAVA_HOME environment variable.
[INFO] 1 error
[INFO] -------------------------------------------------------------