修正并发的问题

git-svn-id: http://code.alibabatech.com/svn/druid/trunk@220 b9813039-fb51-4c41-a8b9-e21c2acb5095

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

@@ -571,6 +571,7 @@ public abstract class DruidAbstractDataSource implements DataSource, DataSourceP
     protected void printStackTrace(Throwable e) {
         if (logWriter != null) {
             e.printStackTrace(logWriter);
+            logWriter.flush();
         }
     }
 

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

@@ -522,9 +522,7 @@ public class DruidDataSource extends DruidAbstractDataSource implements DruidDat
                     ConnectionHolder poolableConnection = new ConnectionHolder(DruidDataSource.this, connection);
                     connections[count++] = poolableConnection;
 
-                    if (count == 1) {
-                        notEmpty.signal();
-                    }
+                    notEmpty.signal();
 
                 } catch (InterruptedException e) {
                     break;

src/test/java/com/alibaba/druid/bvt/pool/Case2.java

@@ -40,9 +40,9 @@ public class Case2 extends TestCase {
         properties.put("maxActive", "100");
         properties.put("maxIdle", "30");
         properties.put("maxWait", "10000");
-        properties.put("url", "jdbc:derby:memory:tomcat-jndi;create=true");
+        properties.put("url", "jdbc:mock:");
         properties.put("filters", "stat");
-        properties.put("validationQuery", "");
+        properties.put("validationQuery", "SELECT 1");
         final DruidDataSource dataSource = (DruidDataSource) com.alibaba.druid.pool.DruidDataSourceFactory.createDataSource(properties);
         JMXUtils.register("com.alibaba.druid:type=DruidDataSource", dataSource);