ADD: Test and possible fix for (C)LOBs being handed out of connnection-context

Signed-off-by: Jonas Pöhler (JPo) <jonas.poehler@foconis.de>

ebean-core/src/main/java/io/ebeaninternal/server/rawsql/DRawSqlService.java

@@ -9,6 +9,7 @@ import io.ebeaninternal.server.query.DefaultSqlRow;
 import java.sql.ResultSet;
 import java.sql.ResultSetMetaData;
 import java.sql.SQLException;
+import java.sql.Types;
 
 public class DRawSqlService implements SpiRawSqlService {
 
@@ -49,6 +50,26 @@ public class DRawSqlService implements SpiRawSqlService {
         name = combine(meta.getSchemaName(i), meta.getTableName(i), name);
       }
       ret.put(name, resultSet.getObject(i));
+
+      // convert (C/B)LOBs to java objects.
+      // A java.sql.Clob depends on an open connection, so storing this object in a map
+      // that is accessed later, when the connection is closed, will result in a "connection is closed" exception.
+      // From the java.sql.Clob documentation: "... which means that a Clob object contains a logical pointer to the SQL CLOB
+      // data rather than the data itself."
+      switch (meta.getColumnType(i)) {
+        case Types.CLOB:
+        case Types.NCLOB:
+          ret.put(name, resultSet.getString(i));
+          break;
+
+        case Types.BLOB:
+          ret.put(name, resultSet.getBytes(i));
+          break;
+
+        default:
+          ret.put(name, resultSet.getObject(i));
+          break;
+      }
     }
     return ret;
   }