配置Web.xml使这个Servlet在启动时加载。
<servlet>
<servlet-name>testConnectionPooler</servlet-name>
<servlet-class>com.test.web.TestServlet</servlet-class>
<load-on-startup>2</load-on-startup>
</servlet>
启动Tomcat
出现信息如下
2004-3-20 21:28:05 org.apache.commons.modeler.Registry getRegistry
信息: Creating new Registry instance
2004-3-20 21:28:06 org.apache.commons.modeler.Registry getServer
信息: Creating MBeanServer
2004-3-20 21:28:07 org.apache.coyote.http11.Http11Protocol init
信息: Initializing Coyote HTTP/1.1 on port 80
Starting service Tomcat-Standalone
Apache Tomcat/4.1.27-LE-jdk14
2004-03-20 21:28:11,843 INFO [main] web.TestServlet (TestServlet.java:43) - 连接池OK
2004-3-20 21:28:13 org.apache.struts.util.PropertyMessageResources <init>
信息: Initializing, config='org.apache.struts.util.LocalStrings', returnNull=true
2004-3-20 21:28:13 org.apache.struts.util.PropertyMessageResources <init>
现在我们关闭MySQL数据库服务，再重新启动Tomcat
出现信息如下
2004-3-20 21:26:48 org.apache.commons.modeler.Registry getRegistry
信息: Creating new Registry instance
2004-3-20 21:26:49 org.apache.commons.modeler.Registry getServer
信息: Creating MBeanServer
2004-3-20 21:26:50 org.apache.coyote.http11.Http11Protocol init
信息: Initializing Coyote HTTP/1.1 on port 80
Starting service Tomcat-Standalone
Apache Tomcat/4.1.27-LE-jdk14
2004-03-20 21:26:55,421 ERROR [main] web.TestServlet (TestServlet.java:48) - 出现错误Cannot create PoolableConnectionFactory
2004-3-20 21:26:56 org.apache.struts.util.PropertyMessageResources <init>
信息: Initializing, config='org.apache.struts.util.LocalStrings', returnNull=true
2004-3-20 21:26:56 org.apache.struts.util.PropertyMessageResources <init>
好了数据库连接已经成功，接下来我们重新配置Hibernate，使其支持连接池
