Re: GWT tutorial does not compile

If you want to use REST, you should use Domino REST simple framework for GWT, see: https://github.com/DominoKit/domino-rest

Here is my example using REST with Domino REST for GWT: https://github.com/lofidewanto/stockwatcher/blob/3079899cb55da13f5d5bc2bd385868dc9276fd89/stockwatcher-springboot/stockwatcher-springboot-client/src/main/java/stockwatcher/client/ResponseFromServerPanel.java#L184

If you cannot add Domino REST, we need to use a simple JavaScript API but I won't recommend that to you... Maybe you check in your Nexus first whether you can find Domino REST? It is also in Maven Central...

https://github.com/DominoKit/domino-rest/wiki/Quick-start

GWT 2.9.0.

Thanks

likejudo schrieb am Montag, 17. Mai 2021 um 22:00:12 UTC+2:

The REST example uses Postman as client, not GWT.

I need to use Spring Boot for server, and GWT for client. REST is fine if I don't have to add new libraries.

(I want to avoid adding libraries like Domino to keep it simple and not worry about yet learning another tool, availability in my repo, and license).

Working in baby steps, I want to send a file from the GWT client to SpringBoot server.

Following the Spring docs https://spring.io/guides/gs/uploading-files/

I added a multipart file parameter, but then get a compile error

My code is here: https://github.com/1dropaflame/UploadStocks/commit/3c1599253f569c439f6d755b917be5b74140b97c

@WebServlet("/stockwatcher/greet")

public class GreetingServiceImpl extends RemoteServiceServlet implements GreetingService {

public GreetingResponse greetServer(@RequestParam("file") MultipartFile file,

RedirectAttributes redirectAttributes) throws IllegalArgumentException {

// Verify that the input is valid.

System.out.println("greetServer is called!");

I tried changing the GreetingService also but also get a compile error:

[INFO] --- maven-compiler-plugin:3.8.1:compile (default-compile) @ StockWatcher-shared ---

[INFO] Changes detected - recompiling the module!

[INFO] Compiling 4 source files to C:\Users\User\Documents\Learn\GWT\Nalu\StockWatcher\StockWatcher-shared\target\classes

[INFO] -------------------------------------------------------------

[ERROR] COMPILATION ERROR :

[INFO] -------------------------------------------------------------

[ERROR] /C:/Users/User/Documents/Learn/GWT/Nalu/StockWatcher/StockWatcher-shared/src/main/java/stockwatcher/GreetingService.java:[11,38] cannot find symbol

  symbol:   class MultipartFile

  location: interface stockwatcher.GreetingService

[ERROR] /C:/Users/User/Documents/Learn/GWT/Nalu/StockWatcher/StockWatcher-shared/src/main/java/stockwatcher/GreetingService.java:[11,58] cannot find symbol

  symbol:   class RedirectAttributes

  location: interface stockwatcher.GreetingService

[INFO] 2 errors

[INFO] -------------------------------------------------------------

[INFO] ------------------------------------------------------------------------

[INFO] Reactor Summary for StockWatcher 1.0-SNAPSHOT:

[INFO]

[INFO] StockWatcher ....................................... SUCCESS [  0.075 s]

[INFO] StockWatcher-shared ................................ FAILURE [  0.835 s]

[INFO] StockWatcher-client ................................ SKIPPED

[INFO] StockWatcher-server ................................ SKIPPED

[INFO] ------------------------------------------------------------------------

[INFO] BUILD FAILURE

[INFO] ------------------------------------------------------------------------

[INFO] Total time:  1.914 s

[INFO] Finished at: 2021-05-17T14:50:09-05:00

[INFO] ------------------------------------------------------------------------

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.1:compile (default-compile) on project StockWatcher-shared: Compilation failure: Compilation failure:

[ERROR] /C:/Users/User/Documents/Learn/GWT/Nalu/StockWatcher/StockWatcher-shared/src/main/java/stockwatcher/GreetingService.java:[11,38] cannot find symbol

[ERROR]   symbol:   class MultipartFile

[ERROR]   location: interface stockwatcher.GreetingService

[ERROR] /C:/Users/User/Documents/Learn/GWT/Nalu/StockWatcher/StockWatcher-shared/src/main/java/stockwatcher/GreetingService.java:[11,58] cannot find symbol

[ERROR]   symbol:   class RedirectAttributes

[ERROR]   location: interface stockwatcher.GreetingService

[ERROR] -> [Help 1]

[ERROR]

[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.

[ERROR] Re-run Maven using the -X switch to enable full debug logging.

[ERROR]

[ERROR] For more information about the errors and possible solutions, please read the following articles:

[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException

[ERROR]

[ERROR] After correcting the problems, you can resume the build with the command

[ERROR]   mvn <args> -rf :StockWatcher-shared

On Monday, May 17, 2021 at 12:17:58 PM UTC-5 lofid...@gmail.com wrote:

You need to decide first, what communication protocol you want to use between your Web browser (client) and your Spring Boot (server):

• GWT RPC 
  
• REST 
  

In both cases you can upload your files...

GWT RPC: https://stackoverflow.com/questions/9160535/is-it-possible-to-upload-a-file-via-gwt-rpc-servlets

REST: https://www.websparrow.org/spring/spring-boot-rest-api-file-upload-save-example

Hope this helps!

Am Mo., 17. Mai 2021 um 18:58 Uhr schrieb likejudo <anil...@gmail.com>:

Dr Lofi,

I need to make a file uploader for a spring boot server and was looking at the generated code. I see that the Impl extends  RemoteServiceServlet.

The example for file uploads however, has its own controller.

https://spring.io/guides/gs/uploading-files/

@Controller public class FileUploadController {

.....

@PostMapping("/") public String handleFileUpload(@RequestParam("file") MultipartFile file, RedirectAttributes redirectAttributes) {

 

NaluKit has the servicing method in the Impl.

https://github.com/1dropaflame/UploadStocks/blob/main/StockWatcher/StockWatcher-server/src/main/java/stockwatcher/GreetingServiceImpl.java

@WebServlet("/stockwatcher/greet")
public class GreetingServiceImpl extends RemoteServiceServlet implements GreetingService {

I am confused which to follow.

On Monday, May 17, 2021 at 11:44:33 AM UTC-5 lofid...@gmail.com wrote:

Yeah, I think your Nexus is connected to Maven Central... So you would have everything which is already uploaded at Maven Central...

Other than Maven Central is difficult...

likejudo schrieb am Montag, 17. Mai 2021 um 16:32:00 UTC+2:

@TBroyer, @Lofi

When I looked in my employer's Nexus repo searching for "gwt-maven-plugin" I found only the Mojo Codehaus plugin.

So I assumed that we did not have it.

A few days ago, I searched instead for "net.ltgt.gwt.maven" and found it! :)

On Monday, May 17, 2021 at 7:09:21 AM UTC-5 t.br...@gmail.com wrote:

On Sunday, May 16, 2021 at 5:54:51 PM UTC+2 lofid...@gmail.com wrote:

Yes that also fine.

The main thing: use the TBroyer Maven plugin instead the old one or Eclipse plugin.

Except, he said several times that he couldn't: " I don't have a choice. I have to use what is in my employer's repository."

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