Unable to deploy maven project on Google App Engin

Question

My maven project is working fine locally but it's just not getting deployed on gcloud. Following is the Error log and pom.xml file:-

Error log:-

[INFO] Scanning for projects...
[WARNING] The POM for com.google.appengine:appengine-maven-plugin:jar:1.9.66 is missing, no dependency information available
[WARNING] Failed to retrieve plugin descriptor for com.google.appengine:appengine-maven-plugin:1.9.66: Plugin com.google.appengine:appengine-maven-plugin:1.9.66 or one of its dependencies could not be resolved: Failure to find com.google.appengine:appengine-maven-plugin:jar:1.9.66 in https://repo.maven.apache.org/maven2 was cached in the local repository, resolution will not be reattempted until the update interval of central has elapsed or updates are forced
[INFO] Downloading from : https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-metadata.xml
[INFO] Downloading from : https://repo.maven.apache.org/maven2/org/codehaus/mojo/maven-metadata.xml
[INFO] Downloaded from : https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-metadata.xml (14 kB at 9.4 kB/s)
[INFO] Downloaded from : https://repo.maven.apache.org/maven2/org/codehaus/mojo/maven-metadata.xml (20 kB at 14 kB/s)
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2.744 s
[INFO] Finished at: 2018-10-08T22:43:01+05:30
[INFO] ------------------------------------------------------------------------
[ERROR] No plugin found for prefix 'appengine' in the current project and in the plugin groups [org.apache.maven.plugins, org.codehaus.mojo] available from the repositories [local (/Users/shashankk/.m2/repository), central (https://repo.maven.apache.org/maven2)] -> [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/NoPluginFoundForPrefixException

pom.xml:-

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>LiveInBliss</groupId>
  <artifactId>LiveInBliss</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>war</packaging>
  <build>
  <!-- [START resources] -->
    <resources>
      <resource>
        <directory>src/main/resources</directory>
        <filtering>true</filtering>
      </resource>
    </resources>
    <!-- [END resources] -->

    <plugins>


   <plugin>
    <groupId>org.eclipse.jetty</groupId>
    <artifactId>jetty-maven-plugin</artifactId>
    <version>9.4.0.M0</version>
</plugin> 



    <plugin>
            <groupId>com.google.appengine</groupId>
            <artifactId>appengine-maven-plugin</artifactId>
            <version>1.9.66</version>
        </plugin>




      <plugin>
        <artifactId>maven-war-plugin</artifactId>
        <version>3.2.1</version>
      </plugin>
    </plugins>
  </build>
  <dependencies>
  <dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>javax.servlet-api</artifactId>
    <version>3.1.0</version>
    <type>jar</type>
    <scope>provided</scope>
  </dependency>
  <!-- https://mvnrepository.com/artifact/javax.mail/mail -->
<dependency>
    <groupId>javax.mail</groupId>
    <artifactId>mail</artifactId>
    <version>1.4</version>
</dependency>

  <dependency>
  <groupId>com.google.cloud</groupId>
  <artifactId>google-cloud</artifactId>
  <version>0.8.0</version>
</dependency>
<dependency>
  <groupId>com.google.cloud</groupId>
  <artifactId>google-cloud-storage</artifactId>
  <version>1.34.0</version>
</dependency>
<dependency>                        <!-- http://dev.mysql.com/doc/connector-j/en/ -->
  <groupId>mysql</groupId>
  <artifactId>mysql-connector-java</artifactId>
  <version>6.0.5</version>
</dependency>
<dependency>
  <groupId>com.google.cloud.sql</groupId>
  <artifactId>mysql-socket-factory-connector-j-6</artifactId>
  <version>1.0.10</version>
</dependency>
</dependencies>
<properties>
<maven.compiler.source>1.8</maven.compiler.source>
  <maven.compiler.target>1.8</maven.compiler.target>
<!--
    INSTANCE_CONNECTION_NAME from Cloud Console > SQL > Instance Details > Properties
    or `gcloud sql instances describe <instance> | grep connectionName`
-->
    <INSTANCE_CONNECTION_NAME>live-in-bliss:northamerica-northeast1:liveinbliss-99</INSTANCE_CONNECTION_NAME>
    <user>root</user>
    <password>my_password</password>
    <database>my_database</database>
    <sqlURL>jdbc:mysql://google/$liveinbliss?cloudSqlInstance=$live-in-bliss:northamerica-northeast1:liveinbliss-99&amp;socketFactory=com.google.cloud.sql.mysql.SocketFactory&amp;user=$root&amp;password=$my_password&amp;useSSL=false</sqlURL>
  </properties>

</project>

I think I have added all the required dependencies but still don't know what's causing this.

Also, I don't know why but there are errors related to JRE:- Pls see the following two images:-

They need Java 1.8 and I have already set Java 1.8 as seen in the following image:-

Please help me with this.

Thank you!!!