Retry attempts to acquire a new channel on generic failures

Do a generic retry on ExecutionException in Client

Author: gmfeinberg

driver/pom.xml

@@ -47,7 +47,7 @@
     <java.apidoc>http://docs.oracle.com/javase/8/docs/api</java.apidoc>
     <maven.deploy.skip>false</maven.deploy.skip>
     <netty.version>4.1.94.Final</netty.version>
-    <jackson.version>2.13.2</jackson.version>
+    <jackson.version>2.15.2</jackson.version>
     <bouncy.version>1.70</bouncy.version>
    <!-- by default, skip tests; tests require a profile -->
    <maven.test.skip>true</maven.test.skip>
@@ -370,10 +370,7 @@
           <link>${java.apidoc}</link>
           <additionalOptions>
             <additionalOption>-author</additionalOption>
-            <additionalOption>--frames</additionalOption>
           </additionalOptions>
-          <!-- below option makes the search bar work correctly -->
-          <additionalJOption>--no-module-directories</additionalJOption>
           <!-- put output in target/apidocs -->
           <reportOutputDirectory>
             ${project.build.directory}/apidocs

driver/src/main/java/oracle/nosql/driver/http/Client.java

@@ -880,13 +880,20 @@ public Result execute(Request kvRequest) {
                 throw new NoSQLException("Request interrupted: " +
                                          ie.getMessage());
             } catch (ExecutionException ee) {
-                kvRequest.setRateLimitDelayedMs(rateDelayedMs);
-                statsControl.observeError(kvRequest);
-                logInfo(logger, "Unable to execute request: " +
-                        ee.getCause().getMessage());
-                /* is there a better exception? */
-                throw new NoSQLException(
-                    "Unable to execute request: " + ee.getCause().getMessage());
+                /*
+                 * This can happen if a channel is bad in HttpClient.getChannel.
+                 * This happens if the channel is shut down by the server side
+                 * or the server (proxy) is restarted, etc. Treat it like
+                 * IOException above, but retry without waiting
+                 */
+                String name = ee.getCause().getClass().getName();
+                logFine(logger, "Client ExecutionException, name: " +
+                        name + ", message: " + ee.getMessage() + ", retrying");
+
+                kvRequest.addRetryException(ee.getCause().getClass());
+                kvRequest.incrementRetries();
+                exception = ee.getCause();
+                continue;
             } catch (TimeoutException te) {
                 exception = te;
                 logInfo(logger, "Timeout exception: " + te);