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Executing Maven:  -B -f /var/lib/jenkins/jobs/CitizensAPI/workspace/pom.xml clean install javadoc:javadoc
[INFO] Scanning for projects...
[HUDSON] Collecting dependencies info
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[INFO] Building CitizensAPI 2.0.25-SNAPSHOT
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[INFO] 
[INFO] --- maven-clean-plugin:2.4.1:clean (default-clean) @ citizensapi ---
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[INFO] --- maven-resources-plugin:2.4.3:resources (default-resources) @ citizensapi ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory /var/lib/jenkins/jobs/CitizensAPI/workspace/src/main/resources
[INFO] 
[INFO] --- maven-compiler-plugin:2.3.2:compile (default-compile) @ citizensapi ---
[INFO] Compiling 246 source files to /var/lib/jenkins/jobs/CitizensAPI/workspace/target/classes
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[ERROR] COMPILATION ERROR : 
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[ERROR] /var/lib/jenkins/jobs/CitizensAPI/workspace/src/main/java/net/citizensnpcs/api/persistence/PersistenceLoader.java:[126,40] error: incompatible types: inference variable E has incompatible bounds
[INFO] 1 error
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[WARNING] Attempt to (de-)serialize anonymous class org.jfrog.hudson.maven2.MavenDependenciesRecorder$1; see: https://jenkins.io/redirect/serialization-of-anonymous-classes/
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[INFO] BUILD FAILURE
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[INFO] Total time: 4.582s
[INFO] Finished at: Tue May 14 09:59:10 UTC 2019
[INFO] Final Memory: 20M/169M
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Waiting for Jenkins to finish collecting data
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile (default-compile) on project citizensapi: Compilation failure
[ERROR] /var/lib/jenkins/jobs/CitizensAPI/workspace/src/main/java/net/citizensnpcs/api/persistence/PersistenceLoader.java:[126,40] error: incompatible types: inference variable E has incompatible bounds
[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