Warnings are given on release:prepare

[dakusui]

Following warnings are given when mvn release:{prepare,perform} is executed.

[INFO] Executing goals 'deploy'...
[WARNING] Maven will be executed in interactive mode, but no input stream has been configured for this MavenInvoker instance.
[INFO] [INFO] Scanning for projects...
[INFO] [WARNING] 
[INFO] [WARNING] Some problems were encountered while building the effective model for com.github.dakusui:actionunit:jar:5.1.4
[INFO] [WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-source-plugin is missing.
[INFO] [WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-javadoc-plugin is missing.
[INFO] [WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-deploy-plugin is missing.
[INFO] [WARNING] 
[INFO] [WARNING] It is highly recommended to fix these problems because they threaten the stability of your build.
[INFO] [WARNING] 
[INFO] [WARNING] For this reason, future Maven versions might no longer support building such malformed projects.
[INFO] [WARNING] 
[INFO] [INFO] 
[INFO] [INFO] ------------------------------------------------------------------------
[INFO] [INFO] Building actionunit 5.1.4
[INFO] [INFO] ------------------------------------------------------------------------
[INFO] [INFO] 
[INFO] [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ actionunit ---
[INFO] [INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] [INFO] skip non existing resourceDirectory /home/hiroshi/workspace/actionunit/target/checkout/src/main/resources
[INFO] [INFO] 
[INFO] [INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ actionunit ---
[INFO] [INFO] Changes detected - recompiling the module!
[INFO] [INFO] Compiling 36 source files to /home/hiroshi/workspace/actionunit/target/checkout/target/classes
[INFO] [INFO] 
[INFO] [INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ actionunit ---
[INFO] [INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] [INFO] skip non existing resourceDirectory /home/hiroshi/workspace/actionunit/target/checkout/src/test/resources
[INFO] [INFO] 
[INFO] [INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ actionunit ---
[INFO] [INFO] Changes detected - recompiling the module!
[INFO] [INFO] Compiling 37 source files to /home/hiroshi/workspace/actionunit/target/checkout/target/test-classes
[INFO] [WARNING] /home/hiroshi/workspace/actionunit/target/checkout/src/test/java/com/github/dakusui/actionunit/extras/cmd/CmdExample.java: /home/hiroshi/workspace/actionunit/target/checkout/src/test/java/com/github/dakusui/actionunit/extras/cmd/CmdExample.java uses unchecked or unsafe operations.
[INFO] [WARNING] /home/hiroshi/workspace/actionunit/target/checkout/src/test/java/com/github/dakusui/actionunit/extras/cmd/CmdExample.java: Recompile with -Xlint:unchecked for details.
[INFO] [INFO] 
[INFO] [INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ actionunit ---
[INFO] [INFO] Surefire report directory: /home/hiroshi/workspace/actionunit/target/checkout/target/surefire-reports
[INFO]