Console Output

Established TCP socket on 37647
<===[JENKINS REMOTING CAPACITY]===>channel started
Established TCP socket on 41719
<===[JENKINS REMOTING CAPACITY]===>channel started
Executing Maven:  -B -f /var/lib/jenkins/jobs/d1_cn_version_tool_beta/workspace/d1_cn_version_tool/pom.xml clean install javadoc:javadoc
[INFO] Scanning for projects...
[WARNING] 
[WARNING] Some problems were encountered while building the effective model for org.dataone:d1_cn_version_tool:jar:2.3.0
[WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-compiler-plugin is missing. @ line 16, column 12
[WARNING] 'build.plugins.plugin.version' for org.codehaus.mojo:buildnumber-maven-plugin is missing. @ line 24, column 21
[WARNING] 
[WARNING] It is highly recommended to fix these problems because they threaten the stability of your build.
[WARNING] 
[WARNING] For this reason, future Maven versions might no longer support building such malformed projects.
[WARNING] 
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building DataONE CN Component Version Tool 2.3.0
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] --- maven-clean-plugin:2.3:clean (default-clean) @ d1_cn_version_tool ---
[INFO] 
[INFO] --- buildnumber-maven-plugin:1.4:create (default) @ d1_cn_version_tool ---
[INFO] Executing: /bin/sh -c cd '/var/lib/jenkins/jobs/d1_cn_version_tool_beta/workspace/d1_cn_version_tool' && 'svn' '--non-interactive' 'info'
[INFO] Working directory: /var/lib/jenkins/jobs/d1_cn_version_tool_beta/workspace/d1_cn_version_tool
[INFO] Storing buildNumber: 18828 at timestamp: 1497184358487
[INFO] Executing: /bin/sh -c cd '/var/lib/jenkins/jobs/d1_cn_version_tool_beta/workspace/d1_cn_version_tool' && 'svn' '--non-interactive' 'info'
[INFO] Working directory: /var/lib/jenkins/jobs/d1_cn_version_tool_beta/workspace/d1_cn_version_tool
[INFO] Storing buildScmBranch: branches/D1_CN_VERSION_TOOL_v2.3
[INFO] 
[INFO] --- maven-resources-plugin:2.3:resources (default-resources) @ d1_cn_version_tool ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 0 resource
[INFO] 
[INFO] --- maven-compiler-plugin:2.0.2:compile (default-compile) @ d1_cn_version_tool ---
[INFO] Compiling 5 source files to /var/lib/jenkins/jobs/d1_cn_version_tool_beta/workspace/d1_cn_version_tool/target/classes
Notifying upstream projects of job completion
Join notifier requires a CauseAction
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 5.876s
[INFO] Finished at: Sun Jun 11 12:32:39 UTC 2017
[INFO] Final Memory: 18M/238M
[INFO] ------------------------------------------------------------------------
Waiting for Jenkins to finish collecting data[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.0.2:compile (default-compile) on project d1_cn_version_tool: Compilation failure
[ERROR] Unable to locate the Javac Compiler in:
[ERROR] /usr/lib/jvm/java-8-openjdk-amd64/jre/../lib/tools.jar
[ERROR] Please ensure you are using JDK 1.4 or above and
[ERROR] not a JRE (the com.sun.tools.javac.Main class is required).
[ERROR] In most cases you can change the location of your Java
[ERROR] installation by setting the JAVA_HOME environment variable.
[ERROR] -> [Help 1]

[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException