Docker build failure

Description

Docker build are failing, docker details as below:

Client:
 Version:       17.12.1-ce
 API version:   1.35
 Go version:    go1.9.4
 Git commit:    7390fc6
 Built: Tue Feb 27 22:17:40 2018
 OS/Arch:       linux/amd64

Server:
 Engine:
  Version:      17.12.1-ce
  API version:  1.35 (minimum version 1.12)
  Go version:   go1.9.4
  Git commit:   7390fc6
  Built:        Tue Feb 27 22:16:13 2018
  OS/Arch:      linux/amd64
  Experimental: false

Swagger-codegen version

3.0.0 and master

Command line used for generation

git clone https://github.com/swagger-api/swagger-codegen.git
cd swagger-codegen
docker build . -t swagger/codegen-3.0.0-rc

Steps to reproduce

git clone https://github.com/swagger-api/swagger-codegen.git
cd swagger-codegen
docker build . -t swagger/codegen-3.0.0-rc

akhil@testing:~/setup/tests/generated/swagger-codegen-3.0.0-rc0$ docker build . -t swagger/codegen-3.0.0-rc
Sending build context to Docker daemon  5.177MB
Step 1/15 : FROM jimschubert/8-jdk-alpine-mvn:1.0
 ---> 240eccea6c3b
Step 2/15 : RUN set -x &&     apk add --no-cache bash
 ---> Using cache
 ---> 94a5c893cd05
Step 3/15 : ENV GEN_DIR /opt/swagger-codegen
 ---> Using cache
 ---> d6a706fc2c16
Step 4/15 : WORKDIR ${GEN_DIR}
 ---> Using cache
 ---> 73312c1a59af
Step 5/15 : VOLUME  ${MAVEN_HOME}/.m2/repository
 ---> Using cache
 ---> b03c0e2cd11f
Step 6/15 : COPY ./LICENSE ${GEN_DIR}
 ---> Using cache
 ---> 8e4788d9f4ee
Step 7/15 : COPY ./google_checkstyle.xml ${GEN_DIR}
 ---> Using cache
 ---> d99ba1dcabc0
Step 8/15 : COPY ./modules/swagger-codegen-maven-plugin ${GEN_DIR}/modules/swagger-codegen-maven-plugin
 ---> Using cache
 ---> 70377cc02f44
Step 9/15 : COPY ./modules/swagger-codegen-cli ${GEN_DIR}/modules/swagger-codegen-cli
 ---> Using cache
 ---> 5067508f4d55
Step 10/15 : COPY ./modules/swagger-codegen ${GEN_DIR}/modules/swagger-codegen
 ---> Using cache
 ---> 3dd8be25f1e2
Step 11/15 : COPY ./pom.xml ${GEN_DIR}
 ---> Using cache
 ---> baa77c7511c7
Step 12/15 : RUN mvn -am -pl "modules/swagger-codegen-cli" package
 ---> Running in e22e430b5da4
[INFO] Scanning for projects...
Downloading: https://oss.sonatype.org/content/repositories/snapshots/org/sonatype/oss/oss-parent/5/oss-parent-5.pom
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Downloaded: https://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-utils/1.4.1/plexus-utils-1.4.1.jar (185 KB at 104.1 KB/sec)
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Downloading: https://repo.maven.apache.org/maven2/org/apache/maven/wagon/wagon-provider-api/1.0-alpha-6/wagon-provider-api-1.0-alpha-6.pom
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Downloaded: https://repo.maven.apache.org/maven2/org/apache/maven/wagon/wagon-provider-api/1.0-alpha-6/wagon-provider-api-1.0-alpha-6.jar (42 KB at 81.3 KB/sec)
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Downloaded: https://repo.maven.apache.org/maven2/commons-logging/commons-logging/1.0.3/commons-logging-1.0.3.jar (31 KB at 24.4 KB/sec)
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Downloaded: https://repo.maven.apache.org/maven2/commons-httpclient/commons-httpclient/2.0.2/commons-httpclient-2.0.2.jar (221 KB at 146.5 KB/sec)
[ERROR] [ERROR] Some problems were encountered while processing the POMs:
[ERROR] Child module /opt/swagger-codegen/modules/swagger-generator of /opt/swagger-codegen/pom.xml does not exist @
 @
[ERROR] The build could not read 1 project -> [Help 1]
[ERROR]
[ERROR]   The project io.swagger:swagger-codegen-project:3.0.0-rc0 (/opt/swagger-codegen/pom.xml) has 1 error
[ERROR]     Child module /opt/swagger-codegen/modules/swagger-generator of /opt/swagger-codegen/pom.xml does not exist
[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
The command '/bin/sh -c mvn -am -pl "modules/swagger-codegen-cli" package' returned a non-zero code: 1
```

Reproduce the failure from the repository root with docker build . -t swagger/codegen-3.0.0-rc, using the Docker build steps and the shown mvn -am -pl "modules/swagger-codegen-cli" package command as entry points. Identify the first failing step in the complete build output and verify that the Docker image builds successfully afterward.