I am trying to run the language-entities project and finding below runtime errors while executing the app .

Exception in thread "main" java.lang.NoClassDefFoundError: com/google/auth/Servi
ceAccountSigner
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at com.google.api.gax.core.GoogleCredentialsProvider.getCredentials(Goog
leCredentialsProvider.java:54)
at com.google.cloud.language.v1.LanguageServiceClient.(LanguageSer
viceClient.java:124)
at com.google.cloud.language.v1.LanguageServiceClient.create(LanguageSer
viceClient.java:112)
at com.google.cloud.language.v1.LanguageServiceClient.create(LanguageSer
viceClient.java:103)
at com.google.cloud.language.samples.Analyze.main(Analyze.java:60)
Caused by: java.lang.ClassNotFoundException: com.google.auth.ServiceAccountSigne
r
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 17 more

Also mainClass in POM is not pointed to right file
https://github.com/GoogleCloudPlatform/java-docs-samples/blob/master/language/analysis/pom.xml#L56

Pls check and update POM dependencies with necessary exclusions if required.