build failure on windows

[patflynn]

Description of the issue:
error after running jib:build with no gcr cred helper installed
Expected behavior:
a helpful message explaining I didn't have cred helper configured properly
Steps to reproduce:
checkout https://github.com/patflynn/kplay/tree/jib-based
run mvn jib:build
Environment:
C:\Users\patrick\Projects\kplay\spring-boot-basic>mvn -version
Apache Maven 3.3.9 (bb52d8502b132ec0a5a3f4c09453c07478323dc5; 2015-11-10T11:41:47-05:00)
Maven home: C:\Users\patrick\Tools\apache-maven-3.3.9\bin..
Java version: 9.0.1, vendor: Oracle Corporation
Java home: C:\Program Files\Java\jdk-9.0.1
Default locale: en_US, platform encoding: Cp1252
OS name: "windows 10", version: "10.0", arch: "amd64", family: "dos"

jib-maven-plugin Configuration:

PASTE YOUR pom.xml CONFIGURATION HERE

Log output:
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2.129 s
[INFO] Finished at: 2018-02-07T15:50:53-05:00
[INFO] Final Memory: 23M/78M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal com.google.cloud.tools:jib-maven-plugin:0.1.0:build (default-cli) on project demo-app: Execution default-cli of goal com.google.cloud.tools:jib-maven-plugin:0.1.0:build failed: Illegal char <> at index 0: * -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal com.google.cloud.tools:jib-maven-plugin:0.1.0:build (default-cli) on project demo-app: Execution default-cli of goal com.google.cloud.tools:jib-maven-plugin:0.1.0:build fail
ed: Illegal char <> at index 0: *
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:212)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80)
at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:307)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106)
at org.apache.maven.cli.MavenCli.execute(MavenCli.java:863)
at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:288)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:199)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
Caused by: org.apache.maven.plugin.PluginExecutionException: Execution default-cli of goal com.google.cloud.tools:jib-maven-plugin:0.1.0:build failed: Illegal char <> at index 0: *
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:145)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:207)
... 20 more
Caused by: java.nio.file.InvalidPathException: Illegal char <> at index 0: *
at java.base/sun.nio.fs.WindowsPathParser.normalize(WindowsPathParser.java:182)
at java.base/sun.nio.fs.WindowsPathParser.parse(WindowsPathParser.java:153)
at java.base/sun.nio.fs.WindowsPathParser.parse(WindowsPathParser.java:77)
at java.base/sun.nio.fs.WindowsPath.parse(WindowsPath.java:92)
at java.base/sun.nio.fs.WindowsFileSystem.getPath(WindowsFileSystem.java:229)
at java.base/java.nio.file.Path.resolve(Path.java:402)
at com.google.cloud.tools.jib.builder.BuildImageSteps.getEntrypoint(BuildImageSteps.java:175)
at com.google.cloud.tools.jib.builder.BuildImageSteps.run(BuildImageSteps.java:127)
at com.google.cloud.tools.jib.maven.BuildImageMojo.buildImage(BuildImageMojo.java:157)
at com.google.cloud.tools.jib.maven.BuildImageMojo.execute(BuildImageMojo.java:142)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
... 21 more
[ERROR]

Additional Information:

[coollog]

This should be fixed by changing all use of Path to strings instead in the SourceFilesConfiguration and building the entrypoint of the container, so that the entrypoint is always in Unix format.