Hi,

I’m new using Box.com’s Java SDK. The application I’m working is trying to use Java to connect to Box.com in order to download a file. The application is a Spring Boot project, version 2.5.9, compiled using Java 8.

The code below “fails” in method: BoxDeveloperEditionAPIConnection.getAppEnterpriseConnection(boxConfig, tokenCache). The method does not throw an error and never comes back from the call. The thread this process is in Stops.

         try {

      Reader reader = new FileReader("D:/Box/xxxxxxx_config.json");

      BoxConfig boxConfig = BoxConfig.readFrom(reader);

      IAccessTokenCache tokenCache = new InMemoryLRUAccessTokenCache(100);



      BoxDeveloperEditionAPIConnection api = BoxDeveloperEditionAPIConnection.getAppEnterpriseConnection(boxConfig, tokenCache);



      BoxFile file = new BoxFile(api, "1081XXXXXXXXX");

      BoxFile.Info info = file.getInfo();



      FileOutputStream stream = new FileOutputStream(info.getName());

      file.download(stream);



      try {

        stream.close();

      } catch (IOException e) {

        System.out.println("Failed to close output stream" + e);

      }

    } catch (BoxAPIException e) {

      System.out.println("Error creating Box enterprise client");

      e.printStackTrace();

    } catch (IOException e1) {

      System.out.println("Error creating Box enterprise client:" + e1);

      e1.printStackTrace();

    } catch (Exception e2) {

      System.out.println("Error - Run time exception" + e2);

      e2.printStackTrace();

    }

Debugging indicates that the call to new OkHttpClient.Builder(this.httpClient) in method BoxAPIConnection.buildHttpClients() fails.

  private void buildHttpClients() {

      OkHttpClient.Builder httpClientBuilder = new OkHttpClient.Builder();

      if (this.trustManager != null) {

         try {

            SSLContext sslContext = SSLContext.getInstance("SSL");

            sslContext.init((KeyManagerK])null, new TrustManageru]{this.trustManager}, new SecureRandom());

            httpClientBuilder.sslSocketFactory(sslContext.getSocketFactory(), this.trustManager);

         } catch (KeyManagementException | NoSuchAlgorithmException var3) {

            throw new RuntimeException(var3);

         }

      }



      OkHttpClient.Builder builder = httpClientBuilder.followSslRedirects(true).followRedirects(true).connectTimeout(Duration.ofMillis((long)this.connectTimeout)).readTimeout(Duration.ofMillis((long)this.readTimeout)).connectionSpecs(Collections.singletonList(ConnectionSpec.MODERN_TLS));

      if (this.hostnameVerifier != null) {

         httpClientBuilder.hostnameVerifier(this.hostnameVerifier);

      }



      if (this.proxy != null) {

         builder.proxy(this.proxy);

         if (this.proxyUsername != null && this.proxyPassword != null) {

            builder.proxyAuthenticator((route, response) -> {

               String credential = Credentials.basic(this.proxyUsername, this.proxyPassword);

               return response.request().newBuilder().header("Proxy-Authorization", credential).build();

            });

         }



         if (this.authenticator != null) {

            builder.proxyAuthenticator(this.authenticator);

         }

      }



      builder = this.modifyHttpClientBuilder(builder);

      this.httpClient = builder.build();

      this.noRedirectsHttpClient = (**new OkHttpClient.Builder(this.httpClient)**).followSslRedirects(false).followRedirects(false).build();

   }

I’ve tried SDK versions 4.0.0, 4.6.1 as well as 4.7.0, with the same result.

Any advice on how to solve this issue would be helpful.

Thanks in advance,

Bob