TomcatInstrumentableClassLoader Servlet ClassNotFoundException
I using Tomcat 6 as the App Server for my web application which uses the AOP to inject DAO into servlet but the problem 1 is Tomcat still using the default server class loader rather than TomcatInstrumentableClassLoader to load the GenericServlet. From the stacktrace, Error loading org.springframework.instrument.classloading.tomcat .TomcatInstrumentableClassLoader. Why is it ?
Problem 2 is Tomcast class loader tries to load GenericServlet from default package rather than custom defined package. Thus, I tried to put GenericServlet.class into default package and I realized the TomcatInstrumentableClassLoader complaints NoClassDefFoundError.
Question 1:
As mentione as above.
Question 2:
I create this project (DAO) as war dynamic project in eclipse ?
How to use this DAO in another project such as war project using @Autowired GenericDAO ? Is it merge applicationContext.xml or configure contextConfigLocation ? Is it using XMLApplicationContext for jar project ?
StackTrace:
Code:
INFO: Initializing Spring root WebApplicationContext
17:21:02,477 INFO ContextLoader:272 - Root WebApplicationContext: initialization started
17:21:02,571 INFO XmlWebApplicationContext:510 - Refreshing Root WebApplicationContext: startup date [Mon Dec 31 17:21:02 SGT 2012]; root of context hierarchy
17:21:02,635 INFO XmlBeanDefinitionReader:315 - Loading XML bean definitions from ServletContext resource [/WEB-INF/applicationContext.xml]
17:21:02,967 INFO DefaultContextLoadTimeWeaver:89 - Using a reflective load-time weaver for class loader: org.springframework.instrument.classloading.tomcat.TomcatInstrumentableClassLoader
17:21:03,614 INFO DefaultListableBeanFactory:577 - Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@188c838: defining beans root of factory hierarchy
17:21:03,944 INFO EhCacheManagerFactoryBean:100 - Initializing EHCache CacheManager
17:21:04,263 INFO MLog:80 - MLog clients using log4j logging.
17:21:04,330 INFO C3P0Registry:204 - Initializing c3p0-0.9.1.2 [built 21-May-2007 15:04:56; debug? true; trace: 10]
17:21:04,471 INFO ContextLoader:301 - Root WebApplicationContext: initialization completed in 1993 ms
Dec 31, 2012 5:21:04 PM org.apache.coyote.http11.Http11Protocol start
INFO: Starting Coyote HTTP/1.1 on http-8080
Dec 31, 2012 5:21:04 PM org.apache.jk.common.ChannelSocket init
INFO: JK: ajp13 listening on /0.0.0.0:8009
Dec 31, 2012 5:21:04 PM org.apache.jk.server.JkMain start
INFO: Jk running ID=0 time=0/11 config=null
Dec 31, 2012 5:21:04 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 2354 ms
Dec 31, 2012 5:21:08 PM org.apache.catalina.core.ApplicationContext log
INFO: Marking servlet GenericServlet as unavailable
Dec 31, 2012 5:21:08 PM org.apache.catalina.core.ApplicationContext log
SEVERE: Error loading org.springframework.instrument.classloading.tomcat.TomcatInstrumentableClassLoader
WebappClassLoader
context: /BISDAO
delegate: false
repositories:
/WEB-INF/classes/
----------> Parent Classloader:
org.apache.catalina.loader.StandardClassLoader@3c0007
GenericServlet
java.lang.ClassNotFoundException: GenericServlet
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1680)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1128)
at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:827)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:129)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Unknown Source)
Dec 31, 2012 5:21:08 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Allocate exception for servlet GenericServlet
java.lang.ClassNotFoundException: GenericServlet
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1680)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1128)
at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:827)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:129)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Unknown Source)
Below is my configuration:
I have put spring-instrument-tomcat-3.1.2.RELEASE.jar into $CATALINA_HOME\lib and have context.xml inside my META-INF folder.
Code:
<?xml version='1.0' encoding='utf-8'?>
<Context path="/BISDAO">
<Loader loaderClass="org.springframework.instrument.classloading.tomcat.TomcatInstrumentableClassLoader" />
</Context>
applicationContext.xml
Code:
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-2.5.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-2.5.xsd">
<context:annotation-config />
<context:component-scan base-package="com.breeze.bis.core.service.jdbcTemplate" />
<context:load-time-weaver aspectj-weaving="autodetect" />
<tx:annotation-driven proxy-target-class="false" transaction-manager="transactionManager"/>
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
<property name="jdbcUrl" value="jdbc:mysql://localhost:3306/vbossdb" />
<property name="driverClass" value="com.mysql.jdbc.Driver" />
<property name="user" value="root" />
<property name="password" value="root" />
</bean>
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<constructor-arg type="javax.sql.DataSource" ref="dataSource"></constructor-arg>
</bean>
<bean id="genericDaoImpl" class="com.breeze.bis.core.service.jdbcTemplate.GenericDAOImpl">
<property name="jdbcDao" ref="jdbcTemplate"></property>
</bean>
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"></property>
</bean>
</beans>
Servlet.java
Code:
@Configurable
public class GenericServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
@Autowired
GenericDAO dao;
}
Please help.
Thanks.
