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Java example calling Pega API cases
Hi,
I'm trying to call the cases Pega API using a Java program to create a case in Pega. But I'm always getting a http code 400.
Are there any Java examples?
Thnx.
Regards,
Oene
***Edited by Moderator Marissa to update platform capability tags****
Posted: 5 years ago
Pegasystems Inc.
IN
Please find the code below
Replace your class name and user and password
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Please find the code below
Replace your class name and user and password
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.nio.charset.StandardCharsets;
import java.util.Base64;
import java.util.List;
import java.util.Map;
class Util {
public static String readResponse(HttpURLConnection connection) throws Exception {
return readResponse(connection, false);
}
public static String readResponse(HttpURLConnection connection, boolean isError) throws Exception {
BufferedReader br = null;
if (isError) {
br = new BufferedReader(new InputStreamReader(connection.getErrorStream()));
} else {
br = new BufferedReader(new InputStreamReader(connection.getInputStream()));
}
StringBuffer jsonString = new StringBuffer();
String line = "";
while ((line = br.readLine()) != null) {
jsonString.append(line);
}
br.close();
connection.disconnect();
return jsonString.toString();
}
public static String buildBasicAuthorizationString() {
String credentials = "admin.myapp:rules123";
return "Basic " + new String(Base64.getEncoder().encodeToString(credentials.getBytes(StandardCharsets.UTF_8)));
}
public static void responseHeaders(HttpURLConnection connection) {
System.out.println("\r\nResponse header:");
Map<String, List<String>> map = connection.getHeaderFields();
for (Map.Entry<String, List<String>> entry : map.entrySet()) {
System.out.println(entry.getKey() + " : " + entry.getValue());
}
}
}
public class MainPost {
private static String payload = "{ \"caseTypeID\": \"O86DVK-MyApp-Work-Test\", \"processID\": \"pyStartCase\", \"parentCaseID\": \"\", \"content\": {} }";
private static HttpURLConnection connection = null;
public static void main(String[] args) {
String requestUrl = "http://localhost:8732/prweb/api/v1/cases";
System.out.println("Request:\r\n" + payload);
System.out.println();
sendGetRequest(requestUrl, payload);
}
public static void sendGetRequest(String requestUrl, String payload) {
try {
URL url = new URL(requestUrl);
connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("POST");
connection.setRequestProperty("Accept", "application/json");
connection.setDoOutput(true);
// connection.setRequestProperty("Accept", "application/json");
connection.setRequestProperty("Authorization", Util.buildBasicAuthorizationString());
// connection.setRequestProperty("Content-Type",
// "application/json");
// connection.setRequestProperty("Content-Length",
// Integer.toString(payload.length()));
OutputStream os = connection.getOutputStream();
os.write(payload.getBytes());
os.flush();
System.out.println("HTTP code: " + connection.getResponseCode());
System.out.println();
if (connection.getResponseCode() == 201) {
System.out.println("Response:\r\n" + Util.readResponse(connection));
}
} catch (Exception e) {
System.err.println("Exception:\r\n");
System.err.println(e.getMessage());
e.printStackTrace();
} finally {
if (connection != null) {
try {
if (connection.getResponseCode() == 400 || connection.getResponseCode() == 403) {
Thread.sleep(500);
System.out.print("Error response:\r\n");
System.out.println(Util.readResponse(connection, true));
}
} catch (Exception e) {
System.err.println(e.getMessage());
}
Util.responseHeaders(connection);
connection.disconnect();
}
}
}
}
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Posted: 5 years ago
PEGA
Pegasystems Inc.
US
To add more, your question is really not unique to Pega. There are a lot of public resources regarding Java REST client examples, e.g., https://github.com/howtoprogram/Java-Examples/tree/master/Java-RESTful-Client-Example. Furthermore, I wonder why you need to write java code to access Pega API endpoints. Pega promotes low-code development, e.g., you can use Connect-REST as REST client (instead of having to write custom java code, which should be last resort) if that suites your particular requirement.