ERROR "Failed to read artifact descriptor for junit:junit:jar:4.12" happens when restarting BPMS server instance

Issue

If there is no internet access in the server where Business Central is running, when we start BPMS server instance , the following exception happens.

2017-11-09 11:01:26,704 ERROR [org.kie.api.builder.KieScanner] (MSC service thread 1-2) Unable to create MavenProject from InputStream: org.kie.scanner.embedder.MavenEmbedderException: Failed to read artifact descriptor for junit:junit:jar:4.12
    at org.kie.scanner.embedder.MavenEmbedder.readProject(MavenEmbedder.java:302)
    at org.kie.scanner.embedder.MavenProjectLoader.parseMavenPom(MavenProjectLoader.java:62)
    at org.kie.scanner.embedder.MavenProjectLoader.parseMavenPom(MavenProjectLoader.java:55)
    at org.kie.scanner.MavenPomModelGenerator.parse(MavenPomModelGenerator.java:33)
    at org.drools.compiler.kproject.xml.PomModel$Parser.parse(PomModel.java:110)
    at org.drools.compiler.kie.builder.impl.AbstractKieModule.getPomModel(AbstractKieModule.java:436)
    at org.drools.compiler.kie.builder.impl.AbstractKieModule.getJarDependencies(AbstractKieModule.java:130)
    at org.kie.scanner.MavenClassLoaderResolver.getClassLoader(MavenClassLoaderResolver.java:65)
    at org.drools.compiler.kie.builder.impl.KieModuleKieProject.<init>(KieModuleKieProject.java:68)
    at org.drools.compiler.kie.builder.impl.KieServicesImpl.newKieContainer(KieServicesImpl.java:188)
    at org.drools.compiler.kie.builder.impl.KieServicesImpl.newKieContainer(KieServicesImpl.java:172)
    at org.jbpm.kie.services.impl.KModuleDeploymentService.deploy(KModuleDeploymentService.java:137)
 ...
Caused by: org.eclipse.aether.resolution.ArtifactDescriptorException: Failed to read artifact descriptor for junit:junit:jar:4.12
 ...
Caused by: org.eclipse.aether.resolution.ArtifactResolutionException: Could not transfer artifact junit:junit:pom:4.12 from/to central (https://repo.maven.apache.org/maven2): repo.maven.apache.org: unknown error
 ...
Caused by: java.net.UnknownHostException: repo.maven.apache.org: unknown error
    at java.net.Inet4AddressImpl.lookupAllHostAddr(Native Method)
    at java.net.InetAddress$2.lookupAllHostAddr(InetAddress.java:928)
    at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1323)
    at java.net.InetAddress.getAllByName0(InetAddress.java:1276)
    at java.net.InetAddress.getAllByName(InetAddress.java:1192)
    at java.net.InetAddress.getAllByName(InetAddress.java:1126)
    at org.apache.http.impl.conn.SystemDefaultDnsResolver.resolve(SystemDefaultDnsResolver.java:45)
 ...

How can we avoid this error?