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https://issues.apache.org/jira/browse/CAMEL-10727?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15831508#comment-15831508
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Johan Vandeweerd commented on CAMEL-10727:
------------------------------------------
Nice! I'll test it when the snapshot version is available and will give
feedback.
> camel-ftp: knownHostsUri configuration with camel 2.18.1
> --------------------------------------------------------
>
> Key: CAMEL-10727
> URL: https://issues.apache.org/jira/browse/CAMEL-10727
> Project: Camel
> Issue Type: Bug
> Components: camel-ftp
> Affects Versions: 2.18.1
> Reporter: Johan Vandeweerd
> Assignee: Claus Ibsen
> Priority: Minor
> Fix For: 2.18.2, 2.19.0
>
>
> I have a known_hosts file on my classpath and I want the ftp-component to use
> this known_hosts file when connecting to an sftp server (and not be dependent
> on the ~/.ssh/known_hosts file).
> The documentation (http://camel.apache.org/ftp2.html) mentions that u can use
> the option knownHostsUri to configure the (classpath) location of a
> known_hosts file.
> When using this option (in combination with the option
> useUserKnownHostsFile=false), camel fails to connect to the server because of
> a NullPointerException (see below).
> When debugging, it seems that the list of known_hosts from the classpath are
> first loaded succesfully (SftpOperations:268) but afterwards the known_hosts
> are ALWAYS overridden (SftpOperations:284). When setting the option
> useUserKnownHostsFile to false, there is no file to load (no fallback to the
> known_hosts file from the home directory) and the exception is thrown.
> I made a small github project (https://github.com/johanvandeweerd/camel-sftp)
> that can be cloned and run to reproduce the error. You can play with the
> options in SftpRouteBuilder.
> Stacktrace:
> {code}
> 2017-01-17 18:19:33.397 WARN 2652 --- [ main]
> o.a.c.c.file.remote.SftpConsumer : Error auto creating directory:
> pub/example due Cannot connect to sftp://[email protected]:22. This
> exception is ignored.
> org.apache.camel.component.file.GenericFileOperationFailedException: Cannot
> connect to sftp://[email protected]:22
> at
> org.apache.camel.component.file.remote.SftpOperations.connect(SftpOperations.java:146)
> ~[camel-ftp-2.18.1.jar:2.18.1]
> at
> org.apache.camel.component.file.remote.RemoteFileConsumer.connectIfNecessary(RemoteFileConsumer.java:203)
> ~[camel-ftp-2.18.1.jar:2.18.1]
> at
> org.apache.camel.component.file.remote.SftpConsumer.doStart(SftpConsumer.java:53)
> ~[camel-ftp-2.18.1.jar:2.18.1]
> at
> org.apache.camel.support.ServiceSupport.start(ServiceSupport.java:61)
> [camel-core-2.18.1.jar:2.18.1]
> at
> org.apache.camel.impl.DefaultCamelContext.startService(DefaultCamelContext.java:3371)
> [camel-core-2.18.1.jar:2.18.1]
> at
> org.apache.camel.impl.DefaultCamelContext.doStartOrResumeRouteConsumers(DefaultCamelContext.java:3688)
> [camel-core-2.18.1.jar:2.18.1]
> at
> org.apache.camel.impl.DefaultCamelContext.doStartRouteConsumers(DefaultCamelContext.java:3624)
> [camel-core-2.18.1.jar:2.18.1]
> at
> org.apache.camel.impl.DefaultCamelContext.safelyStartRouteServices(DefaultCamelContext.java:3544)
> [camel-core-2.18.1.jar:2.18.1]
> at
> org.apache.camel.impl.DefaultCamelContext.doStartOrResumeRoutes(DefaultCamelContext.java:3308)
> [camel-core-2.18.1.jar:2.18.1]
> at
> org.apache.camel.impl.DefaultCamelContext.doStartCamel(DefaultCamelContext.java:3162)
> [camel-core-2.18.1.jar:2.18.1]
> at
> org.apache.camel.impl.DefaultCamelContext.access$000(DefaultCamelContext.java:182)
> [camel-core-2.18.1.jar:2.18.1]
> at
> org.apache.camel.impl.DefaultCamelContext$2.call(DefaultCamelContext.java:2957)
> [camel-core-2.18.1.jar:2.18.1]
> at
> org.apache.camel.impl.DefaultCamelContext$2.call(DefaultCamelContext.java:2953)
> [camel-core-2.18.1.jar:2.18.1]
> at
> org.apache.camel.impl.DefaultCamelContext.doWithDefinedClassLoader(DefaultCamelContext.java:2976)
> [camel-core-2.18.1.jar:2.18.1]
> at
> org.apache.camel.impl.DefaultCamelContext.doStart(DefaultCamelContext.java:2953)
> [camel-core-2.18.1.jar:2.18.1]
> at
> org.apache.camel.support.ServiceSupport.start(ServiceSupport.java:61)
> [camel-core-2.18.1.jar:2.18.1]
> at
> org.apache.camel.impl.DefaultCamelContext.start(DefaultCamelContext.java:2920)
> [camel-core-2.18.1.jar:2.18.1]
> at
> org.apache.camel.spring.boot.RoutesCollector.maybeStart(RoutesCollector.java:141)
> [camel-spring-boot-2.18.1.jar:2.18.1]
> at
> org.apache.camel.spring.boot.RoutesCollector.onApplicationEvent(RoutesCollector.java:116)
> [camel-spring-boot-2.18.1.jar:2.18.1]
> at
> org.apache.camel.spring.boot.RoutesCollector.onApplicationEvent(RoutesCollector.java:41)
> [camel-spring-boot-2.18.1.jar:2.18.1]
> at
> org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:166)
> [spring-context-4.3.5.RELEASE.jar:4.3.5.RELEASE]
> at
> org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:138)
> [spring-context-4.3.5.RELEASE.jar:4.3.5.RELEASE]
> at
> org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:383)
> [spring-context-4.3.5.RELEASE.jar:4.3.5.RELEASE]
> at
> org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:337)
> [spring-context-4.3.5.RELEASE.jar:4.3.5.RELEASE]
> at
> org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:882)
> [spring-context-4.3.5.RELEASE.jar:4.3.5.RELEASE]
> at
> org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.finishRefresh(EmbeddedWebApplicationContext.java:144)
> [spring-boot-1.4.3.RELEASE.jar:1.4.3.RELEASE]
> at
> org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:545)
> [spring-context-4.3.5.RELEASE.jar:4.3.5.RELEASE]
> at
> org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122)
> [spring-boot-1.4.3.RELEASE.jar:1.4.3.RELEASE]
> at
> org.springframework.boot.SpringApplication.refresh(SpringApplication.java:761)
> [spring-boot-1.4.3.RELEASE.jar:1.4.3.RELEASE]
> at
> org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:371)
> [spring-boot-1.4.3.RELEASE.jar:1.4.3.RELEASE]
> at
> org.springframework.boot.SpringApplication.run(SpringApplication.java:315)
> [spring-boot-1.4.3.RELEASE.jar:1.4.3.RELEASE]
> at
> org.springframework.boot.SpringApplication.run(SpringApplication.java:1186)
> [spring-boot-1.4.3.RELEASE.jar:1.4.3.RELEASE]
> at
> org.springframework.boot.SpringApplication.run(SpringApplication.java:1175)
> [spring-boot-1.4.3.RELEASE.jar:1.4.3.RELEASE]
> at be.engine31.camel.Application.main(Application.java:10)
> [classes/:na]
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> ~[na:1.8.0_91]
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> ~[na:1.8.0_91]
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> ~[na:1.8.0_91]
> at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_91]
> at
> com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)
> [idea_rt.jar:na]
> Caused by: java.lang.NullPointerException: null
> at com.jcraft.jsch.Util.checkTilde(Util.java:489)
> ~[jsch-0.1.54.jar:na]
> at com.jcraft.jsch.KnownHosts.setKnownHosts(KnownHosts.java:54)
> ~[jsch-0.1.54.jar:na]
> at com.jcraft.jsch.JSch.setKnownHosts(JSch.java:317)
> ~[jsch-0.1.54.jar:na]
> at
> org.apache.camel.component.file.remote.SftpOperations.createSession(SftpOperations.java:284)
> ~[camel-ftp-2.18.1.jar:2.18.1]
> at
> org.apache.camel.component.file.remote.SftpOperations.connect(SftpOperations.java:115)
> ~[camel-ftp-2.18.1.jar:2.18.1]
> ... 38 common frames omitted
> {code}
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