Build Docker Image File of Spring Boot Application - maven

Question

I am trying to build a docker image for my spring boot maven project by using dockerfile-maven-plugin. I am using Docker Tool Box on windows 7 and it is running fine.
I am getting Below Error:
Failed to load Google application default credentials
java.io.IOException: The Application Default Credentials are not
available. They are available if running in Google Compute Engine.
Otherwise, the environment variable GOOGLE_APPLICATION_CREDENTIALS
must be defined pointing to a file defining the credentials. See
https://developers.google.com/accounts/docs/application-default-credentials
for more information.
Pom.XML Build
<build>
<plugins>
<plugin>
<groupId>com.spotify</groupId>
<artifactId>dockerfile-maven-plugin</artifactId>
<version>1.4.10</version>
<executions>
<execution>
<id>default</id>
<goals>
<goal>build</goal>
</goals>
</execution>
</executions>
<configuration>
<serverId>docker-hub</serverId>
<repository>${project.artifactId}</repository>
<tag>${project.version}</tag>
<buildArgs>
<JAR_FILE>target/${project.build.finalName}.jar</JAR_FILE>
</buildArgs>
</configuration>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<executions>
<execution>
<goals>
<goal>repackage</goal>
</goals>
</execution>
</executions>
<configuration>
<outputDirectory>D:\spring\MicroServiceOutput</outputDirectory>
</configuration>
</plugin>
</plugins>
</build>
I am not able to get that why we need google default credential to build a local image.Please help me out as I am new to Docker World.

Answer 1

It seems that's a bug, by default the plugin set googleContainerRegistryEnabled flag to true, so you have to change that flag to false, try this:
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
<spring-cloud.version>Greenwich.RC2</spring-cloud.version>
<docker.image.prefix>prefix</docker.image.prefix>
<docker.image.name>${project.artifactId}</docker.image.name>
<docker.image.tag>${project.version}</docker.image.tag>
<docker.file>Dockerfile</docker.file>
</properties>
...
<plugin>
<groupId>com.spotify</groupId>
<artifactId>dockerfile-maven-plugin</artifactId>
<version>1.4.10</version>
<configuration>
<googleContainerRegistryEnabled>false</googleContainerRegistryEnabled>
<repository>${docker.image.prefix}/${docker.image.name}</repository>
<tag>${docker.image.tag}</tag>
<dockerfile>${docker.file}</dockerfile>
</configuration>
<executions>
<execution>
<id>build</id>
<goals>
<goal>build</goal>
<goal>tag</goal>
</goals>
</execution>
<execution>
<id>push</id>
<goals>
<goal>push</goal>
</goals>
</execution>
</executions>
</plugin>