Enable servlet db test

curl http://192.168.122.89:8081/servlet/db

How to prepare the db:

cat > mysql.txt << EOF
drop database if exists hello_world;
create database hello_world;
use hello_world;
drop table if exists World;
CREATE TABLE World ( id int primary key auto_increment, randomNumber
int);
EOF

for i in `seq 1 10000`;do
        echo "insert into World (randomNumber) values (123456);"  >> mysql.txt
done

mysql -uroot -p -h your_db_ip < mysql.txt

Signed-off-by: Asias He <[email protected]>

servlet/src/main/webapp/META-INF/context.xml

@@ -0,0 +1,38 @@
+<?xml version='1.0' encoding='utf-8'?>
+<!--
+  Licensed to the Apache Software Foundation (ASF) under one or more
+  contributor license agreements.  See the NOTICE file distributed with
+  this work for additional information regarding copyright ownership.
+  The ASF licenses this file to You under the Apache License, Version 2.0
+  (the "License"); you may not use this file except in compliance with
+  the License.  You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+-->
+<!-- The contents of this file will be loaded for each web application -->
+<Context>
+
+    <!-- Default set of monitored resources -->
+    <WatchedResource>WEB-INF/web.xml</WatchedResource>
+
+    <!-- Uncomment this to disable session persistence across Tomcat restarts -->
+    <!--
+    <Manager pathname="" />
+    -->
+
+    <!-- Uncomment this to enable Comet connection tacking (provides events
+         on session expiration as well as webapp lifecycle) -->
+    <!--
+    <Valve className="org.apache.catalina.valves.CometConnectionManagerValve" />
+    -->
+    <Resource name="jdbc/hello_world" auth="Container" type="javax.sql.DataSource"
+         maxActive="100" maxIdle="30" maxWait="10000"
+         username="my_db_username" password="my_db_passwd" driverClassName="com.mysql.jdbc.Driver"
+         url="jdbc:mysql://my_db_ip:3306/hello_world"/>
+</Context>

servlet/src/main/webapp/WEB-INF/web.xml

@@ -3,6 +3,12 @@
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
     http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
+  <resource-ref>
+      <description>DB Connection</description>
+      <res-ref-name>jdbc/hello_world</res-ref-name>
+      <res-type>javax.sql.DataSource</res-type>
+      <res-auth>Container</res-auth>
+  </resource-ref>
   <servlet>
     <servlet-name>json</servlet-name>
     <servlet-class>hello.JsonServlet</servlet-class>