Console Output

Established TCP socket on 43921
Exception in thread "main" java.lang.UnsupportedClassVersionError: hudson/remoting/Launcher : Unsupported major.minor version 52.0
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:791)
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
	at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
	at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
	at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClassFromSelf(ClassRealm.java:401)
	at org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy.loadClass(SelfFirstStrategy.java:42)
	at org.codehaus.plexus.classworlds.realm.ClassRealm.unsynchronizedLoadClass(ClassRealm.java:271)
	at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:247)
	at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:239)
	at jenkins.maven3.agent.Maven33Main.main(Maven33Main.java:133)
	at jenkins.maven3.agent.Maven33Main.main(Maven33Main.java:64)
Established TCP socket on 44663
<===[JENKINS REMOTING CAPACITY]===>channel started
Executing Maven:  -B -f /var/lib/jenkins/jobs/guilib/workspace/pom.xml -Dmaven.repo.local=/var/lib/jenkins/maven-repositories/1 deploy -Panon-cc-dev
[INFO] Scanning for projects...
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building guilib 00.00.230-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] Downloading: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-compiler-plugin/3.6.2/maven-compiler-plugin-3.6.2.pom
[INFO] Downloaded: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-compiler-plugin/3.6.2/maven-compiler-plugin-3.6.2.pom (11 KB at 29.7 KB/sec)
[INFO] Downloading: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-compiler-plugin/3.6.2/maven-compiler-plugin-3.6.2.jar
[INFO] Downloaded: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-compiler-plugin/3.6.2/maven-compiler-plugin-3.6.2.jar (74 KB at 1204.2 KB/sec)
[INFO] Downloading: http://svn.jondos.de/maven/repos/anon/anonlib/00.20.044-SNAPSHOT/maven-metadata.xml
[INFO] Downloading: http://anon.inf.tu-dresden.de/artifactory/repo/anon/anonlib/00.20.044-SNAPSHOT/maven-metadata.xml
[INFO] Downloading: http://anon.inf.tu-dresden.de/artifactory/repo/anon/anonlib/00.20.044-SNAPSHOT/anonlib-00.20.044-SNAPSHOT.pom
[INFO] Downloading: http://svn.jondos.de/maven/repos/anon/anonlib/00.20.044-SNAPSHOT/anonlib-00.20.044-SNAPSHOT.pom
[WARNING] The POM for anon:anonlib:jar:00.20.044-SNAPSHOT is missing, no dependency information available
[INFO] Downloading: http://anon.inf.tu-dresden.de/artifactory/repo/anon/anonlib/00.20.044-SNAPSHOT/anonlib-00.20.044-SNAPSHOT.jar
[INFO] Downloading: http://svn.jondos.de/maven/repos/anon/anonlib/00.20.044-SNAPSHOT/anonlib-00.20.044-SNAPSHOT.jar
[WARNING] Attempt to (de-)serialize anonymous class hudson.maven.reporters.MavenArtifactArchiver$2; see: https://jenkins.io/redirect/serialization-of-anonymous-classes/
[WARNING] Attempt to (de-)serialize anonymous class hudson.maven.reporters.MavenFingerprinter$1; see: https://jenkins.io/redirect/serialization-of-anonymous-classes/
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2.568 s
[INFO] Finished at: 2018-04-12T09:58:36+02:00
[INFO] Final Memory: 15M/173M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal on project guilib: Could not resolve dependencies for project anon:guilib:jar:00.00.230-SNAPSHOT: Could not find artifact anon:anonlib:jar:00.20.044-SNAPSHOT in anon.inf.tu-dresden.de (http://anon.inf.tu-dresden.de/artifactory/repo) -> [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/DependencyResolutionException