Maven build and pacakge doesn't work.

[sumedhyadav]

Command: mvn clean package
Complete output:

[INFO] Scanning for projects...
[WARNING] 
[WARNING] Some problems were encountered while building the effective model for com.github.simplesteph.kafka.streams:udemy-reviews-fraud:jar:1.0-SNAPSHOT
[WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-shade-plugin is missing. @ line 142, column 21
[WARNING] 
[WARNING] Some problems were encountered while building the effective model for com.github.simplesteph.kafka.producer:udemy-reviews-producer:jar:1.0-SNAPSHOT
[WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-shade-plugin is missing. @ line 105, column 21
[WARNING] 
[WARNING] Some problems were encountered while building the effective model for com.github.simplesteph.kafka.streams:udemy-reviews-aggregator:jar:1.0-SNAPSHOT
[WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-shade-plugin is missing. @ line 118, 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] Reactor Build Order:
[INFO] 
[INFO] udemy-reviews-producer                                             [jar]
[INFO] udemy-reviews-fraud                                                [jar]
[INFO] udemy-reviews-aggregator                                           [jar]
[INFO] udemy-reviews-parent-project                                       [pom]
[INFO] 
[INFO] ----< com.github.simplesteph.kafka.producer:udemy-reviews-producer >----
[INFO] Building udemy-reviews-producer 1.0-SNAPSHOT                       [1/4]
[INFO] --------------------------------[ jar ]---------------------------------
[INFO] 
[INFO] --- avro-maven-plugin:1.8.2:schema (default) @ udemy-reviews-producer ---
[INFO] 
[INFO] --- avro-maven-plugin:1.8.2:protocol (default) @ udemy-reviews-producer ---
[INFO] 
[INFO] --- avro-maven-plugin:1.8.2:idl-protocol (default) @ udemy-reviews-producer ---
[INFO] 
[INFO] --- build-helper-maven-plugin:3.0.0:add-source (add-source) @ udemy-reviews-producer ---
[INFO] Source directory: /home/sumedh/Documents/Development/Kafka/end-to-end/medium-blog-kafka-udemy-master/udemy-reviews-producer/target/generated-sources/avro added.
[INFO] 
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ udemy-reviews-producer ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 3 resources
[INFO] 
[INFO] --- maven-compiler-plugin:3.6.1:compile (default-compile) @ udemy-reviews-producer ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 9 source files to /home/sumedh/Documents/Development/Kafka/end-to-end/medium-blog-kafka-udemy-master/udemy-reviews-producer/target/classes
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR : 
[INFO] -------------------------------------------------------------
[ERROR] No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK?
[INFO] 1 error
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary for udemy-reviews-parent-project 1.0-SNAPSHOT:
[INFO] 
[INFO] udemy-reviews-producer ............................. FAILURE [  0.949 s]
[INFO] udemy-reviews-fraud ................................ SKIPPED
[INFO] udemy-reviews-aggregator ........................... SKIPPED
[INFO] udemy-reviews-parent-project ....................... SKIPPED
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  1.041 s
[INFO] Finished at: 2020-09-16T15:50:32+05:30
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.6.1:compile (default-compile) on project udemy-reviews-producer: Compilation failure
[ERROR] No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK?
[ERROR] 
[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

[sumedhyadav]

However,
Package works from IntelliJ IDE for the root project @simplesteph.

[pavelu19990]

You should use JDK instead of JRE. Change from JRE to JDK in the run configurations