CS23.2 REST Java Client not working after JDK 17 upgrade

sdarbha · 2023-09-27T21:13:11+00:00

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We wrote a Java Client program to call the REST APIs of OpenText for Uploading the Files to Content Server.

The Program is working on Windows 10 / JDK 1.8 platform.
But when the code is migrated to Linux / JDK 17 platform, we are not able to get the OTCS Ticket.

'response' object is coming as null in the below code in Linuz / JDK17, but is working from Windows 10/JDK1.8.

Are you aware of any changes done in JDK17 that makes it not work ?
Can you please check and help ?

Following is the Code

Client client = ClientBuilder.newClient(); // this line does not complete on Linux

Response response = null;

Form form = new Form();

form.param("username", getIKNOW_USERNAME());

form.param("password", getIKNOW_PASSWORD());

Entity<Form> entity = Entity.form(form);


try 

{

    response = client.target(getIKNOW_BASE_URL() + "/api/v1/auth")

                              .request(MediaType.APPLICATION_JSON_TYPE)

                              .post(entity);


	//	response is returning as NULL.

} catch (Exception e) {

    System.out.println("Exception while calling Auth REST API .. " + e.getMessage());

    System.out.println("Localized Error Message : " + e.getLocalizedMessage());

    e.printStackTrace();

}

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sdarbha

Tried to isolate the issue in a separate simple java file.

The following code line

Client client = ClientBuilder.newClient();

is throwing the below exception

Exception in thread "main" java.lang.LinkageError: ClassCastException: attempting to castjar:file:/u01/app/livelink/iKnowRESTJavaClient/iKnowRESTJavaClient/lib/javax.ws.rs.javax.ws.rs-api.jar!/javax/ws/rs/client/ClientBuilder.class to jar:file:/u01/app/livelink/iKnowRESTJavaClient/iKnowRESTJavaClient/lib/javax.ws.rs.javax.ws.rs-api.jar!/javax/ws/rs/client/ClientBuilder.class
at javax.ws.rs.client.ClientBuilder.newBuilder(ClientBuilder.java:97)
at javax.ws.rs.client.ClientBuilder.newClient(ClientBuilder.java:114)
at iknowrestclient.iKnowRestClient.main(iKnowRestClient.java:14)

This is happening only on Linux / JDK 17.

sdarbha

Instead of ClientBuilder.newClient();, Is there an alternative API we are supposed to be using after upgrading the JDK to 17+ ?

HSS2021

Hi Sameer,

Older jars may not work as expected with JDK 17. You are better off using HttpClient which is embedded in java.net.HTTP.*

I was able to write a simple api/v1/ping call using the code samples provided.

That might be the alternative to go with.

HSS2021

Forgot to add my sample code :


try {

HttpRequest request = HttpRequest.newBuilder()

.uri(new URI("http://ServerFQDN/OTCS/cs.exe/api/v1/ping"))

.version(HttpClient.Version.HTTP_2)

.GET()

.build();

try {

HttpResponse


<String>


 response = HttpClient.newHttpClient()

.send(request, HttpResponse.BodyHandlers.ofString());

System.out.println(response.toString());

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (InterruptedException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

} catch (URISyntaxException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

This would output the following:

(GET http://ServerFQDN/OTCS/cs.exe/api/v1/ping) 200