Fix infinite immediate retries that the client does when Bitbucket Data Center does not response.

Fix stackoverflow in BitbucketApiUtil unwrap method when exception has a cause that refer to itself

Author: nfalco79

checkstyle.xml

@@ -18,6 +18,9 @@
             <property name="separatedStaticGroups" value="true" />
             <property name="option" value="bottom" />
         </module>
+        <module name="LeftCurly">
+            <property name="option" value="eol" />
+        </module>
         <module name="UnusedImports" />
         <module name="AvoidStarImport" />
     </module>

src/main/java/com/cloudbees/jenkins/plugins/bitbucket/impl/client/ExponentialBackoffRetryStrategy.java

@@ -154,6 +154,11 @@ public boolean retryRequest(HttpRequest request, IOException exception, int exec
         return handleAsIdempotent(request);
     }
 
+    @Override
+    public TimeValue getRetryInterval(HttpRequest request, IOException exception, int execCount, HttpContext context) {
+        return TimeValue.ofMilliseconds(getRetryInterval(execCount));
+    }
+
     /**
      * {@inheritDoc}
      */

src/main/java/com/cloudbees/jenkins/plugins/bitbucket/impl/util/BitbucketApiUtils.java

@@ -121,8 +121,10 @@ public static BitbucketRequestException unwrap(Exception e) {
         while (cause != null) {
             if (e instanceof BitbucketRequestException bbException) {
                 return bbException;
-            } else {
+            } else if (cause != e.getCause()) { // avoid stackoverflow when cause is also the exception
                 cause = e.getCause();
+            } else {
+                break;
             }
         }
         return null;

src/test/java/com/cloudbees/jenkins/plugins/bitbucket/BitbucketSCMSourceBuildTest.java

@@ -37,8 +37,8 @@
 import com.cloudbees.plugins.credentials.common.StandardUsernameCredentials;
 import com.cloudbees.plugins.credentials.domains.Domain;
 import com.cloudbees.plugins.credentials.impl.UsernamePasswordCredentialsImpl;
-import hudson.model.Item;
 import hudson.model.Descriptor.FormException;
+import hudson.model.Item;
 import hudson.plugins.git.GitSCM;
 import hudson.plugins.git.UserRemoteConfig;
 import hudson.plugins.git.extensions.impl.BuildChooserSetting;