Useful error message when V$OPEN_CURSOR is not accessible

Author: Michael-A-McMahon

src/test/java/oracle/r2dbc/util/SharedConnectionFactory.java

@@ -27,6 +27,7 @@
 import io.r2dbc.spi.ConnectionFactoryMetadata;
 import io.r2dbc.spi.ConnectionMetadata;
 import io.r2dbc.spi.IsolationLevel;
+import io.r2dbc.spi.R2dbcException;
 import io.r2dbc.spi.Statement;
 import io.r2dbc.spi.ValidationDepth;
 import org.reactivestreams.Publisher;
@@ -38,6 +39,8 @@
 import java.util.concurrent.CompletionStage;
 import java.util.concurrent.atomic.AtomicReference;
 
+import static oracle.r2dbc.DatabaseConfig.user;
+
 /**
  * <p>
  * A {@link ConnectionFactory} which caches a single connection that is
@@ -176,9 +179,17 @@ private static Publisher<String> queryOpenCursors(Connection connection) {
       .execute())
       .flatMapMany(result ->
         result.map((row, metadata) ->
-          row.get("sql_text", String.class)));
-      // Don't count the v$open_cursor query
-      //.filter();
+          row.get("sql_text", String.class)))
+      .onErrorMap(R2dbcException.class, r2dbcException ->
+        // Handle ORA-00942
+        r2dbcException.getErrorCode() == 942
+          ? new RuntimeException(
+              "V$OPEN_CUROSR is not accessible to the test user. " +
+                "Grant access as SYSDBA with: " +
+                "\"GRANT SELECT ON v_$open_cursor TO "+user()+"\", " +
+                "or disable open cursor checks with: " +
+                " -Doracle.r2bdc.disableCursorCloseVerification=true")
+        : r2dbcException);
   }
 
   /**