[connection]完善DefaultConnectionSource日志输出

datagear-connection/src/main/java/org/datagear/connection/DefaultConnectionSource.java

@@ -248,6 +248,10 @@ public class DefaultConnectionSource implements ConnectionSource
 					}
 					catch (Throwable t)
 					{
+						if (LOGGER.isDebugEnabled())
+							LOGGER.debug("checking if [" + driverEntity
+									+ "] 's driver checked for getting prefered connection for [" + connectionOption
+									+ "] error", t);
 					}
 				}
 			}

datagear-connection/src/test/java/org/datagear/connection/XmlDriverEntityManagerTest.java

@@ -106,7 +106,7 @@ public class XmlDriverEntityManagerTest
 			catch (PathDriverFactoryException e)
 			{
 				// 如果当前JRE小于8，将会抛出此异常
-				assertEquals(DriverLoadErrorException.class, e.getClass());
+				assertEquals(DriverNotFoundException.class, e.getClass());
 			}
 		}