Hi Venkatesh, I am not very familiar with AOP but here is some information I found and I guess you may have seen this as well. http://stackoverflow.com/questions/13461985/classcastexception-proxy-cannot-be-cast-to-using-aop
This says that target object needs to implement an interface. However it refers to the link below if the target is a class. http://docs.spring.io/spring/docs/3.0.0.M3/reference/html/ch08s06.html Can you please follow the steps in the above doc and let me know how it goes. Thanks, Chandni On Tue, Nov 3, 2015 at 3:44 PM, Kottapalli, Venkatesh < [email protected]> wrote: > I am trying to log exceptions, some entry and exit parameters for certain > function calls in my implementation, hence I have defined beans to > intercept in the following way. Please let me know if you need more inputs > on this. > > I have used spring core jars : > ===================== > <dependency> > <groupId>org.springframework</groupId> > <artifactId>spring-core</artifactId> > <version>${spring.version}</version> > </dependency> > <dependency> > <groupId>org.springframework</groupId> > <artifactId>spring-context</artifactId> > <version>${spring.version}</version> > </dependency> > > > ApplicationContext definitions : > =========================== > > <bean id=" fileSplitter" class="com.package.SimpleService"/> > <bean id="secondServiceBean" class="com.package.SecondService"/> > > <bean id="logEntryBean" class="com.package.LogEntry" /> > <bean id="logExitBean" class="com.package.LogReturn" /> > <bean id="logExceptionBean" class > ="com.package.logging.ExceptionLogger"/> > > > <bean id="secondServiceProxy" > class="org.springframework.aop.framework.ProxyFactoryBean"> > <property name="target" ref="secondServiceBean" /> > <property name="interceptorNames"> > <list> > <value>logEntryBean</value> > <value>logExitBean</value> > <value>logExceptionBean</value> > </list> > </property> > </bean> > > > Application.java > =============== > > ConfigurableApplicationContext context = new > ClassPathXmlApplicationContext("ApplicationContext.xml"); > FileSplitter call =(FileSplitter) context.getBean("fileSplitter"); > SecondService secondService =(SecondService) > context.getBean("secondServiceProxy"); > > FileSplitter fileSplitter = dag.addOperator("FileSplitter", call); > SecondService reader=dag.addOperator("reader", secondService); > > ConsoleOutputOperator cons = dag.addOperator("console", new > ConsoleOutputOperator()); > dag.addStream("blockin", fileSplitter.blocksMetadataOutput, > reader.blocksMetadataInput); > dag.addStream("randomData", reader.batchData, cons.input); > > > LogEntry : > ========= > > package com.package.logging; > > import java.lang.reflect.Method; > > import org.apache.log4j.Logger; > import org.springframework.aop.MethodBeforeAdvice; > > public class LogEntry implements MethodBeforeAdvice { > private final static Logger logger = > Logger.getLogger(LogEntry.class); > > public void before(Method method, Object[] args, Object target) > throws Throwable { > > if(logger.isDebugEnabled()) > logger.info("logged entry for method : " + > method.getName()); > } > > } > > > SecondService does not implement any interface, it extends CSVBlockReader > class which again extends AbstractBlockReader class. > ========================================================================= > > Exception while running Junit : > =========================== > > java.lang.ClassCastException: com.sun.proxy.$Proxy11 cannot be cast to > com.package.filesplitterimpl.SecondService > at > com.package.filesplitterimpl.Application.populateDAG(Application.java:28) > at > com.datatorrent.stram.plan.logical.LogicalPlanConfiguration.prepareDAG(LogicalPlanConfiguration.java:1191) > at > com.datatorrent.stram.LocalModeImpl.prepareDAG(LocalModeImpl.java:57) > at > com.dtv.myapexapp.ApplicationTest.testApplication(ApplicationTest.java:28) > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) > at > sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) > at > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) > at java.lang.reflect.Method.invoke(Method.java:606) > at > org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45) > at > org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15) > at > org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42) > at > org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20) > at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263) > at > org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68) > at > org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47) > at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231) > at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60) > at > org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229) > at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50) > at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222) > at org.junit.runners.ParentRunner.run(ParentRunner.java:300) > at > org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86) > at > org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) > at > org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459) > at > org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675) > at > org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382) > at > org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192) > > regards, > Venkatesh. > > -----Original Message----- > From: Chandni Singh [mailto:[email protected]] > Sent: Tuesday, November 03, 2015 2:46 PM > To: [email protected] > Subject: Re: Regarding logging and exception handling framework > > Hi Venkatesh, > > Can you please provide a small code snippet or example which shows what > you want to do? > > If you want to find out any validation exception during preparation of > logical plan, then you can take a look at the LogicalPlanTest in Apache > Apex repository. > > Thanks, > Chandni > > > On Tue, Nov 3, 2015 at 2:37 PM, Kottapalli, Venkatesh < > [email protected]> wrote: > > > Hi, > > > > With the framework malhar has, Can we use AOP > > interception technique for logging and exception handling? I have > > tried but unable to proxy Operator classes to intercept during DAG > preparation. Please suggest. > > > > Regards, > > Venkatesh. > > >
