Cloud Translate API Java client - problems using source, target lang

I have an issue here that I'm hoping to resolve. First, when I call the cloud Translate service with source and target languages, I encounter the following error:

java.lang.NoSuchMethodError: com.google.common.base.Preconditions.checkArgument(ZLjava/lang/String;Ljava/lang/Object;)V
at com.google.cloud.translate.TranslateImpl.optionMap(TranslateImpl.java:131)
at com.google.cloud.translate.TranslateImpl.access$000(TranslateImpl.java:40)
at com.google.cloud.translate.TranslateImpl$4.call(TranslateImpl.java:113)
at com.google.cloud.translate.TranslateImpl$4.call(TranslateImpl.java:110)


This is what I'm doing:

protected Translate getTranslationServiceClient() throws IOException
if (translationServiceClient == null)
synchronized (this)
if (translationServiceClient == null)

try (InputStream is = new FileInputStream(new File(getCredentialFilePath())))

final GoogleCredentials myCredentials = GoogleCredentials.fromStream(is);
translationServiceClient = TranslateOptions.newBuilder().setCredentials(myCredentials).build().getService();
catch (IOException ioe)
throw new NuxeoException(ioe);






return translationServiceClient;


public TranslationResponse translateText(String text, String sourceLanguage, String targetLanguage) throws IOException

Translation response = translationService.translate(text, TranslateOption.sourceLanguage("en"), TranslateOption.sourceLanguage("es"));
//System.out.println(response.getTranslatedText());
GoogleTranslationResponse gtr = new GoogleTranslationResponse(response);

return gtr;



The error points to the Cloud's TranslateImpl class optionMap method and spills the NoSuchMethodError on the checkArgument. Am I Passing the TranslateOption's incorrectly??:

private Map<TranslateRpc.Option, ?> optionMap(Option... options)
Map<TranslateRpc.Option, Object> optionMap = Maps.newEnumMap(TranslateRpc.Option.class);
for (Option option : options)
Object prev = optionMap.put(option.getRpcOption(), option.getValue());
checkArgument(prev == null, "Duplicate option %s", option);

return optionMap;


In an effort to get any kind of response from the API, I've tried calling the service without passing any options or just the targetLanguage. Without any options, I don't have any errors and my texted is translated into english, as expected. If I just add TranslateOption.targetLanguage("es"), I still get the NoSuchMethodError.

1 Answer
1

I had this exact same error. The problem was an ancient version of Google Guava being brought in by some other dependency. I found this by running mvn dependency:tree. I had to exclude the ancient version of Guava like this

mvn dependency:tree

<exclusions>
<exclusion>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
</exclusion>
</exclusions>


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