修正异常处理的问题

git-svn-id: http://code.alibabatech.com/svn/druid/trunk@20 b9813039-fb51-4c41-a8b9-e21c2acb5095

src/main/java/com/alibaba/druid/pool/DruidDataAbstractSource.java

@@ -491,9 +491,15 @@ public abstract class DruidDataAbstractSource implements DataSource, DataSourceP
     }
 
     @Override
-    public PrintWriter getLogWriter() throws SQLException {
+    public PrintWriter getLogWriter() {
         return logWriter;
     }
+    
+    protected void printStackTrace(Throwable e) {
+        if (logWriter != null) {
+            e.printStackTrace(logWriter);
+        }
+    }
 
     @Override
     public void setLogWriter(PrintWriter out) throws SQLException {

src/main/java/com/alibaba/druid/pool/DruidDataSource.java

@@ -487,7 +487,7 @@ public class DruidDataSource extends DruidDataAbstractSource implements DruidDat
                 } catch (InterruptedException e) {
                     break;
                 } catch (SQLException e) {
-                    e.printStackTrace();
+                    printStackTrace(e);
                 } finally {
                     lock.unlock();
                 }
@@ -532,7 +532,7 @@ public class DruidDataSource extends DruidDataAbstractSource implements DruidDat
                     try {
                         connection.close();
                     } catch (SQLException e) {
-                        e.printStackTrace(); // TODO
+                        printStackTrace(e);
                     }
 
                     destroyCount++;