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From "Kai Wei" <weika...@gmail.com>
Subject Embedded Tomcat does not read META-INF/context.xml?
Date Thu, 01 Jun 2006 22:28:38 GMT
I'm running Tomcat 5.5.7 in embedded mode, i.e., starting Tomcat using
the org.apache.catalina.startup.Embedded class. For some reason, the
JNDI resource I configured in
$tomcat_home/webapps/my_webapp/META-INF/context.xml is not created
when Tomcat starts. Your help will be greatly appreciated!!

The following is the code that I use for starting Tomcat:

       Embedded tomcat = new Embedded();

       // create an Engine
       Engine catalina = tomcat.createEngine();
       catalina.setName("Catalina");
       catalina.setDefaultHost("localhost");

       // create Host
       StandardHost localhost = (StandardHost)
tomcat.createHost("localhost", "webapps");

       // add host to Engine
       catalina.addChild(localhost);

       // create application Context
       StandardContext appCtx = (StandardContext)
tomcat.createContext("/gc", "gc");

       // make the web app's class loader use the normal delegation
model to search for classes
       appCtx.setDelegate(true);

       // add context to host
       localhost.addChild(appCtx);

       // add new Engine to set of Engine for embedded server
       tomcat.addEngine(catalina);

       // create HTTP Connector
       Connector httpConnector =
tomcat.createConnector((java.net.InetAddress)null, 8080, false);
       IntrospectionUtils.setProperty(httpConnector, "redirectPort", "8443");

       // add new Connector to set of Connectors for embedded server,
associated with Engine
       tomcat.addConnector(httpConnector);

       // create HTTPS Connector
       Connector httpsConnector =
tomcat.createConnector((java.net.InetAddress)null, 8443, true);
       httpsConnector.setScheme("https");
       IntrospectionUtils.setProperty(httpsConnector, "sslProtocol", "TLS");
       IntrospectionUtils.setProperty(httpsConnector, "keypass", "changeit");
       IntrospectionUtils.setProperty(httpsConnector, "keystore",
"emf.keystore");

       // add new Connector to set of Connectors for embedded server,
associated with Engine
       tomcat.addConnector(httpsConnector);

       // start operation
       try {
           tomcat.start();
       } catch (org.apache.catalina.LifecycleException ex) {
           ex.printStackTrace();
       }

As you can see from the code, we have one web app called "gc" running
inside Tomcat. Under the $tomcat_home/webapps/gc directory, we have a
META-INF/context.xml file that defines one JNDI resource (a
javax.sql.DataSource object):

<Context docBase="gc"
        path="/gc"
        crossContext="true" reloadable="true" debug="1"
        workDir="work/Catalina/localhost/gc">
 <Resource
               name="jdbc/gc"
               auth="Container"
           description="GC DataSource Reference"
           type="javax.sql.DataSource"
           factory="com.good.gc.common.util.GCTomcatDataSourceFactory"
           driverClassName="org.postgresql.Driver"
           url="jdbc:postgresql://localhost:5432/gc"
           username="postgres"
           maxIdle="2"
           maxWait="-1"
           maxActive="4"
           validationQuery="select now()"
           />
</Context>

We use the Spring Framework (version 1.2.3 I believe) for the gc
webapp, and inside the spring context config file, we try to grab the
DataSource from the java:comp/env context this way:

   <bean id="myDataSource"
               class="org.springframework.jndi.JndiObjectFactoryBean">
               <property name="jndiName">
                     <value>java:/comp/env/jdbc/gc</value>
               </property>
   </bean>

Everything used to work just fine when we used Tomcat in standalone
mode. But now that we switched to embedded mode, we got the following
error when starting Tomcat up:

2006-06-01 15:02:15,448 ERROR main org.apache.catalina.core.ContainerBase.[Catal
ina].[localhost].[/gc] - Exception sending context initialized event to listener
 instance of class org.springframework.web.context.ContextLoaderListener
 org.springframework.beans.factory.BeanCreationException: Error creating bean wi
th name 'myDataSource' defined in ServletContext resource [/WEB-INF/springContex
tConfig.xml]: Initialization of bean failed; nested exception is javax.naming.Na
mingException: Cannot create resource instance
javax.naming.NamingException: Cannot create resource instance
       at org.apache.naming.factory.ResourceEnvFactory.getObjectInstance(Resour
ceEnvFactory.java:113)
       at javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:3
04)
       at org.apache.naming.NamingContext.lookup(NamingContext.java:792)
       at org.apache.naming.NamingContext.lookup(NamingContext.java:139)
       at org.apache.naming.NamingContext.lookup(NamingContext.java:780)
       at org.apache.naming.NamingContext.lookup(NamingContext.java:139)
       at org.apache.naming.NamingContext.lookup(NamingContext.java:780)
       at org.apache.naming.NamingContext.lookup(NamingContext.java:139)
       at org.apache.naming.NamingContext.lookup(NamingContext.java:780)
       at org.apache.naming.NamingContext.lookup(NamingContext.java:152)
       at org.apache.naming.SelectorContext.lookup(SelectorContext.java:136)
       at javax.naming.InitialContext.lookup(InitialContext.java:351)
       at org.springframework.jndi.JndiTemplate$1.doInContext(JndiTemplate.java
:123)
       at org.springframework.jndi.JndiTemplate.execute(JndiTemplate.java:85)
       at org.springframework.jndi.JndiTemplate.lookup(JndiTemplate.java:121)
       at org.springframework.jndi.JndiLocatorSupport.lookup(JndiLocatorSupport
.java:71)
       at org.springframework.jndi.JndiObjectLocator.lookup(JndiObjectLocator.j
ava:85)
       at org.springframework.jndi.JndiObjectFactoryBean.afterPropertiesSet(Jnd
iObjectFactoryBean.java:124)
       at org.springframework.beans.factory.support.AbstractAutowireCapableBean
Factory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:937)
       at org.springframework.beans.factory.support.AbstractAutowireCapableBean
Factory.createBean(AbstractAutowireCapableBeanFactory.java:334)
       at org.springframework.beans.factory.support.AbstractBeanFactory.getBean
(AbstractBeanFactory.java:222)
       at org.springframework.beans.factory.support.AbstractBeanFactory.getBean
(AbstractBeanFactory.java:146)
       at org.springframework.beans.factory.support.DefaultListableBeanFactory.
preInstantiateSingletons(DefaultListableBeanFactory.java:271)
       at org.springframework.context.support.AbstractApplicationContext.refres
h(AbstractApplicationContext.java:310)
       at org.springframework.web.context.support.AbstractRefreshableWebApplica
tionContext.refresh(AbstractRefreshableWebApplicationContext.java:133)
       at org.springframework.web.context.ContextLoader.createWebApplicationCon
text(ContextLoader.java:230)
       at org.springframework.web.context.ContextLoader.initWebApplicationConte
xt(ContextLoader.java:156)
       at org.springframework.web.context.ContextLoaderListener.contextInitiali
zed(ContextLoaderListener.java:48)
       at org.apache.catalina.core.StandardContext.listenerStart(StandardContex
t.java:3729)
       at org.apache.catalina.core.StandardContext.start(StandardContext.java:4
187)
       at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1013)

       at org.apache.catalina.core.StandardHost.start(StandardHost.java:718)
       at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1013)

       at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:442
)
       at org.apache.catalina.startup.Embedded.start(Embedded.java:821)
       at com.good.emf.TomcatStarter.main(TomcatStarter.java:160)

Looks like Spring cannot obtain the DataSource object from
java:comp/env/jdbc/gc, so I'm suspecting the embedded Tomcat does not
read META-INF/context.xml at all. How can I get this to work?

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