Reading remote file - difference between linux and windows deployments

Hi Ranchers,

I am facing a problem while reading data from linux machine when app deployed in linux machine but able to read from linux when the application deployed in Windows machine. Here I am posting error prone method. I have used jsch-0.1.31.jar , commons-vfs-1.0 jars . I am getting NoSuchMethodException in former case. Could anybody suggest what should be taken care while reading data from linux to linux ..

FileSystemOptions fsOptions = new FileSystemOptions();
			  try{
				  SftpFileSystemConfigBuilder.getInstance().setStrictHostKeyChecking(
			            fsOptions, "no");
			    DefaultFileSystemManager fsManager = (DefaultFileSystemManager)VFS
			            .getManager();
 FileObject fo = fsManager.resolveFile(completeURL.trim(), fsOptions);
			    if(fo.getContent() !=null){
			    	logger.info("fo.getContent().getSize() --->"+fo.getContent().getSize());
			    	logger.info("File Object is readable -->"+fo.isReadable());
				    BufferedInputStream is = new BufferedInputStream(fo.getContent().getInputStream());
				    DataInputStream dis = new DataInputStream(is);
				    monitors = new HashMap<String, String>();
				    try{
				    	logger.info("dis.available()--->"+dis.available());
				    	 while(dis.available() != 0){
						    	str = dis.readLine().split(":");
						    	if(str !=null && str.length>1){
						    		logger.info("Monitor name and value -->"+str[0].trim()+" "+str[1].trim());
						    		monitors.put(str[0].trim(), str[1].trim());
						    	}else if(str != null && str.length>2){
						    		monitors.put(str[0].trim()+":", str[2].trim());
						    	}
						    }
						    is.close();
						    dis.close();
						    fo.close();	
						    fsManager.close();
				    }catch(IOException ioe){
				    	 logger.error("IOException has occured",ioe);
				    }
			    }
			   
			  }catch(FileSystemException fse){
				  logger.error("File system exception has occured",fse);
			  }catch(NoSuchMethodError nsme){
				  logger.error("No such method while connecting to linux server",nsme);
			  }
		}

Without knowing the answer to your problem: you should close your resources in a proper way (try {} finally {}). And you don't need to close the BufferedInputStream since that is being closed by the DataInputStream.

First of all, there's a difference between NoSuchMethodException and NoSuchMethodError. The former is thrown when using reflection to find a method, the latter when a method call is compiled into the byte code but then the method disappears.

Secondly, please call nsme.printStackTrace() to the catch block. That will show you more information, including which method is missing. The cause is probably a difference between classes (or JAR files) between the compilation process and the runtime process.

Ranchers,
I am getting following exception in this case..I have applied couple of fixes suggested but no use. has anybody ever faced this issue?
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.jboss.seam.util.Reflections.invoke(Reflections.java:21)
at org.jboss.seam.intercept.RootInvocationContext.proceed(RootInvocationContext.java:31)
at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:56)
at org.jboss.seam.transaction.RollbackInterceptor.aroundInvoke(RollbackInterceptor.java:31)
at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
at org.jboss.seam.core.BijectionInterceptor.aroundInvoke(BijectionInterceptor.java:46)
at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
at org.jboss.seam.core.MethodContextInterceptor.aroundInvoke(MethodContextInterceptor.java:42)
at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
at org.jboss.seam.core.SynchronizationInterceptor.aroundInvoke(SynchronizationInterceptor.java:32)
at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
at org.jboss.seam.intercept.RootInterceptor.invoke(RootInterceptor.java:107)
at org.jboss.seam.intercept.JavaBeanInterceptor.interceptInvocation(JavaBeanInterceptor.java:166)
at org.jboss.seam.intercept.JavaBeanInterceptor.invoke(JavaBeanInterceptor.java:102)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:112)
at org.jboss.ejb3.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:166)
at org.jboss.seam.intercept.EJBInvocationContext.proceed(EJBInvocationContext.java:44)
at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:56)
at org.jboss.seam.transaction.RollbackInterceptor.aroundInvoke(RollbackInterceptor.java:31)
at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
at org.jboss.seam.core.BijectionInterceptor.aroundInvoke(BijectionInterceptor.java:46)
at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
at org.jboss.seam.core.MethodContextInterceptor.aroundInvoke(MethodContextInterceptor.java:42)
at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
at org.jboss.seam.persistence.EntityManagerProxyInterceptor.aroundInvoke(EntityManagerProxyInterceptor.java:26)
at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
at org.jboss.seam.persistence.HibernateSessionProxyInterceptor.aroundInvoke(HibernateSessionProxyInterceptor.java:27)
at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
at org.jboss.seam.intercept.RootInterceptor.invoke(RootInterceptor.java:107)
at org.jboss.seam.intercept.SessionBeanInterceptor.aroundInvoke(SessionBeanInterceptor.java:50)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.jboss.ejb3.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:118)
at org.jboss.ejb3.interceptor.EJB3InterceptorsInterceptor.invoke(EJB3InterceptorsInterceptor.java:63)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
at org.jboss.ejb3.entity.TransactionScopedEntityManagerInterceptor.invoke(TransactionScopedEntityManagerInterceptor.java:54)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
at org.jboss.ejb3.AllowedOperationsInterceptor.invoke(AllowedOperationsInterceptor.java:47)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
at org.jboss.aspects.tx.TxPolicy.invokeInCallerTx(TxPolicy.java:126)
at org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:195)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
at org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:94)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
at org.jboss.ejb3.stateless.StatelessInstanceInterceptor.invoke(StatelessInstanceInterceptor.java:70)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
at org.jboss.aspects.security.AuthenticationInterceptor.invoke(AuthenticationInterceptor.java:77)
at org.jboss.ejb3.security.Ejb3AuthenticationInterceptor.invoke(Ejb3AuthenticationInterceptor.java:106)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
at org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:46)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
at org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(AsynchronousInterceptor.java:106)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
at org.jboss.ejb3.stateless.StatelessContainer.localInvoke(StatelessContainer.java:216)
at org.jboss.ejb3.stateless.StatelessContainer.localInvoke(StatelessContainer.java:186)
at org.jboss.ejb3.stateless.StatelessLocalProxy.invoke(StatelessLocalProxy.java:81)
... 73 more
Caused by: java.lang.NoSuchMethodError: com.jcraft.jsch.ChannelSftp.isClosed()Z
at org.apache.commons.vfs.provider.sftp.SftpFileSystem.putChannel(SftpFileSystem.java:158)
at org.apache.commons.vfs.provider.sftp.SftpFileObject.statSelf(SftpFileObject.java:148)
at org.apache.commons.vfs.provider.sftp.SftpFileObject.doGetType(SftpFileObject.java:75)
at org.apache.commons.vfs.provider.AbstractFileObject.attach(AbstractFileObject.java:1296)
at org.apache.commons.vfs.provider.AbstractFileObject.getContent(AbstractFileObject.java:1041)

Naresh Kavala wrote:Caused by: java.lang.NoSuchMethodError: com.jcraft.jsch.ChannelSftp.isClosed()Z
at org.apache.commons.vfs.provider.sftp.SftpFileSystem.putChannel(SftpFileSystem.java:158)
at org.apache.commons.vfs.provider.sftp.SftpFileObject.statSelf(SftpFileObject.java:148)
at org.apache.commons.vfs.provider.sftp.SftpFileObject.doGetType(SftpFileObject.java:75)
at org.apache.commons.vfs.provider.AbstractFileObject.attach(AbstractFileObject.java:1296)
at org.apache.commons.vfs.provider.AbstractFileObject.getContent(AbstractFileObject.java:1041)

I think you have a library version problem. The currently available version of JSch is missing the isClosed method of class com.jcraft.jsch.ChannelSftp.