试图运行hello world Java教程，但总是以构建失败而告终。尝试运行其他教程，但最终也失败了。
当前使用Ubuntu 18.04。
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by com.google.inject.internal.cglib.core.$ReflectUtils$1 (file:/usr/share/maven/lib/guice.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain)
WARNING: Please consider reporting this to the maintainers of com.google.inject.internal.cglib.core.$ReflectUtils$1
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
[INFO] Scanning for projects...
[INFO]
[INFO] --------------< org.kurento.tutorial:kurento-hello-world >--------------
[INFO] Building Kurento Java Tutorial - Hello World 6.10.0
[INFO] --------------------------------[ jar ]---------------------------------
[INFO]
[INFO] --- maven-enforcer-plugin:1.4.1:enforce (enforce-java-version) @ kurento-hello-world ---
[INFO]
[INFO] --- maven-enforcer-plugin:1.4.1:enforce (enforce-maven-version) @ kurento-hello-world ---
[INFO]
[INFO] --- maven-enforcer-plugin:1.4.1:enforce (enforce-bytecode-version) @ kurento-hello-world ---
[INFO]
[INFO] --- maven-enforcer-plugin:1.4.1:enforce (enforce-ban-duplicate-classes) @ kurento-hello-world ---
[WARNING] Rule 0: org.apache.maven.plugins.enforcer.BanDuplicateClasses failed with message:
Duplicate classes found:
Found in:
org.slf4j:jcl-over-slf4j:jar:1.7.21:compile
commons-logging:commons-logging:jar:1.1.3:compile
Duplicate classes:
org/apache/commons/logging/impl/SimpleLog$1.class
org/apache/commons/logging/LogConfigurationException.class
org/apache/commons/logging/Log.class
org/apache/commons/logging/impl/NoOpLog.class
org/apache/commons/logging/impl/SimpleLog.class
org/apache/commons/logging/LogFactory.class
[INFO]
[INFO] --- maven-enforcer-plugin:1.4.1:enforce (enforce-ban-circular-dependencies) @ kurento-hello-world ---
[INFO]
[INFO] --- buildnumber-maven-plugin:1.4:create-timestamp (get-build-timestamp) @ kurento-hello-world ---
[INFO]
[INFO] --- buildnumber-maven-plugin:1.4:create (get-scm-revision) @ kurento-hello-world ---
[INFO] Executing: /bin/sh -c cd '/home/michael/kurento/kurento-tutorial-java/kurento-hello-world' && 'git' 'rev-parse' '--verify' 'HEAD'
[INFO] Working directory: /home/michael/kurento/kurento-tutorial-java/kurento-hello-world
[INFO] Storing buildNumber: c7d3db5f3642dd9552beeb3fe4d6d1623ae1eb8c at timestamp: 1563174030151
[WARNING] Cannot get the branch information from the git repository:
Detecting the current branch failed: fatal: ref HEAD is not a symbolic ref
[INFO] Executing: /bin/sh -c cd '/home/michael/kurento/kurento-tutorial-java/kurento-hello-world' && 'git' 'rev-parse' '--verify' 'HEAD'
[INFO] Working directory: /home/michael/kurento/kurento-tutorial-java/kurento-hello-world
[INFO] Storing buildScmBranch: UNKNOWN
[INFO]
[INFO] --- maven-resources-plugin:2.7:resources (default-resources) @ kurento-hello-world ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 11 resources
[INFO] Copying 2 resources
[INFO]
[INFO] --- maven-compiler-plugin:3.3:compile (default-compile) @ kurento-hello-world ---
[INFO] Nothing to compile - all classes are up to date
[INFO]
[INFO] --- exec-maven-plugin:1.6.0:java (default-cli) @ kurento-hello-world ---
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 4.540 s
[INFO] Finished at: 2019-07-15T14:00:30+07:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.6.0:java (default-cli) on project kurento-hello-world: The parameters 'mainClass' for goal org.codehaus.mojo:exec-maven-plugin:1.6.0:java are missing or invalid -> [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/PluginParameterException
我曾尝试降级或使用其他版本，但始终以构建失败而告终。