Getting java.lang.ClassNotFoundException: com.sun.xml.internal.ws.spi.ProviderImpl despite the dependencies are defined

The first part of the answer by @reta works for me. These are the relevant dependencies from my pom (Java 10):

<dependency>
  <groupId>javax.xml.ws</groupId>
  <artifactId>jaxws-api</artifactId>
  <version>2.3.1</version>
</dependency>
<dependency>
  <groupId>com.sun.xml.ws</groupId>
  <artifactId>rt</artifactId>
  <version>2.3.1</version>
</dependency>