-----> Building on the Heroku-20 stack
-----> Using buildpack: heroku/java
-----> Java app detected
-----> Installing JDK 15... done
-----> Installing Maven 3.6.2... done
-----> Executing Maven
       $ mvn -DskipTests clean dependency:list install
       [INFO] Scanning for projects...
       [ERROR] [ERROR] Some problems were encountered while processing the POMs:
       [ERROR] Malformed POM /tmp/build_36149698/pom.xml: Unrecognised tag: 'plugin' (position: START_TAG seen ...</version>\n\n    <plugin>... @11:13)  @ /tmp/build_36149698/pom.xml, line 11, column 13
        @
       [ERROR] The build could not read 1 project -> [Help 1]
       [ERROR]
       [ERROR]   The project org.example:CalciteDiscordBot:1.0-SNAPSHOT (/tmp/build_36149698/pom.xml) has 1 error
       [ERROR]     Malformed POM /tmp/build_36149698/pom.xml: Unrecognised tag: 'plugin' (position: START_TAG seen ...</version>\n\n    <plugin>... @11:13)  @ /tmp/build_36149698/pom.xml, line 11, column 13 -> [Help 2]
       [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/ProjectBuildingException
       [ERROR] [Help 2] http://cwiki.apache.org/confluence/display/MAVEN/ModelParseException
 !     ERROR: Failed to build app with Maven
       We're sorry this build is failing! If you can't find the issue in application code,
       please submit a ticket so we can help: https://help.heroku.com/
 !     Push rejected, failed to compile Java app.
 !     Push failed