Unable to do maven build for Core Annotator Project

[kamesh231]

While trying to do a MavenBuild for Ontology-Annotator-Core project. I hit with this error

Exception in thread "main" java.lang.NoClassDefFoundError: com/google/common/base/Strings
at org.sonatype.nexus.maven.staging.deploy.DeployLifecycleParticipant.getPluginByGAFromContainer(DeployLifecycleParticipant.java:238)
at org.sonatype.nexus.maven.staging.deploy.DeployLifecycleParticipant.getNexusMavenPluginFromContainer(DeployLifecycleParticipant.java:182)
at org.sonatype.nexus.maven.staging.deploy.DeployLifecycleParticipant.getBuildPluginsNexusMavenPlugin(DeployLifecycleParticipant.java:163)
at org.sonatype.nexus.maven.staging.deploy.DeployLifecycleParticipant.afterProjectsRead(DeployLifecycleParticipant.java:95)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:266)
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 sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
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: java.lang.ClassNotFoundException: com.google.common.base.Strings
at org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy.loadClass(SelfFirstStrategy.java:50)
at org.codehaus.plexus.classworlds.realm.ClassRealm.unsynchronizedLoadClass(ClassRealm.java:271)
at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:247)
at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:239)
... 18 more

I tried adding the Guava Jar too in the library and added this entry in POM.xml file-

com.google.guava guava 18

Is there anything else I need to do. Could someone help