How to use

getJwtAccess

method

in

com.google.auth.oauth2.ServiceAccountJwtAccessCredentials

/**
 * Provide the request metadata by putting an access JWT directly in the metadata.
 */
@Override
public Map<String, List<String>> getRequestMetadata(URI uri) throws IOException {
 if (uri == null) {
  if (defaultAudience != null) {
   uri = defaultAudience;
  } else {
   throw new IOException("JwtAccess requires Audience uri to be passed in or the " 
    + "defaultAudience to be specified");
  }
 }
 String assertion = getJwtAccess(uri);
 String authorizationHeader = JWT_ACCESS_PREFIX + assertion;
 List<String> newAuthorizationHeaders = Collections.singletonList(authorizationHeader);
 return Collections.singletonMap(AuthHttpConstants.AUTHORIZATION, newAuthorizationHeaders);
}

/**
 * Provide the request metadata by putting an access JWT directly in the metadata.
 */
@Override
public Map<String, List<String>> getRequestMetadata(URI uri) throws IOException {
 if (uri == null) {
  if (defaultAudience != null) {
   uri = defaultAudience;
  } else {
   throw new IOException("JwtAccess requires Audience uri to be passed in or the " 
    + "defaultAudience to be specified");
  }
 }
 String assertion = getJwtAccess(uri);
 String authorizationHeader = JWT_ACCESS_PREFIX + assertion;
 List<String> newAuthorizationHeaders = Collections.singletonList(authorizationHeader);
 return Collections.singletonMap(AuthHttpConstants.AUTHORIZATION, newAuthorizationHeaders);
}