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https://issues.apache.org/activemq/browse/CAMEL-2687?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Claus Ibsen reassigned CAMEL-2687:
----------------------------------
Assignee: Claus Ibsen
> exec component fails after receiving empty output
> -------------------------------------------------
>
> Key: CAMEL-2687
> URL: https://issues.apache.org/activemq/browse/CAMEL-2687
> Project: Apache Camel
> Issue Type: Bug
> Components: camel-core
> Affects Versions: 2.3.0
> Environment: windows XP, jdk 1.6
> Reporter: Chuck Adams
> Assignee: Claus Ibsen
>
> I have a simple route here:
> {quote}
> public void configure() {
> from("timer://foo?period=5000")
> .to("C:/apps/putty/plink.exe?args=cad...@labmachine -i
> C:/apps/putty/priv/chuck.ppk \"ls /tmp/foo\"")
> .to("log:experiments.cameltest");
> }
> {quote}
> This just runs a dummy command on a remote machine every five seconds.
> Normally it has no problems as long as /tmp/foo has contents. For example, I
> create 'bar' and 'baz' files, and the log reflects this:
> {quote}
> [ main] DefaultCamelContext INFO Apache
> Camel 2.3-SNAPSHOT (CamelContext: camelContext) started in 734 millis
> [ foo] ExecProducer INFO
> Executing ExecCommand [args=[cad...@labmachine, -i,
> C:/apps/putty/priv/chuck.ppk, ls /tmp/foo],
> executable=C:/apps/putty/PLINK.EXE, timeout=9223372036854775807,
> outFile=null, workingDir=null]
> [ foo] ExecProducer INFO The
> command ExecCommand [args=[cad...@labmachine, -i,
> C:/apps/putty/priv/chuck.ppk, ls /tmp/foo],
> executable=C:/apps/putty/PLINK.EXE, timeout=9223372036854775807,
> outFile=null, workingDir=null] had exit value 0
> [ foo] cameltest INFO
> Exchange[ExchangePattern:InOnly,
> BodyType:org.apache.camel.component.exec.ExecResult, Body:bar
> baz
> blah
> ]
> [ foo] ExecProducer INFO
> Executing ExecCommand
> [args=[cad...@spamlab-bizintel-corpus01.eng.symantec.com, -i,
> C:/apps/putty/priv/chuck.ppk, ls /tmp/foo],
> executable=C:/apps/putty/PLINK.EXE, timeout=9223372036854775807,
> outFile=null, workingDir=null]
> [ foo] ExecProducer INFO The
> command ExecCommand [args=[cad...@spamlab-bizintel-corpus01.eng.symantec.com,
> -i, C:/apps/putty/priv/chuck.ppk, ls /tmp/foo],
> executable=C:/apps/putty/PLINK.EXE, timeout=9223372036854775807,
> outFile=null, workingDir=null] had exit value 0
> [ foo] cameltest INFO
> Exchange[ExchangePattern:InOnly,
> BodyType:org.apache.camel.component.exec.ExecResult, Body:bar
> baz
> blah
> ]
> {quote}
> And so on.... But if I delete both files, this is what happens:
> {quote}
> [ foo] ExecProducer INFO
> Executing ExecCommand [args=[cad...@labmachine, -i,
> C:/apps/putty/priv/chuck.ppk, ls /tmp/foo],
> executable=C:/apps/putty/PLINK.EXE, timeout=9223372036854775807,
> outFile=null, workingDir=null]
> [ foo] ExecProducer INFO The
> command ExecCommand [args=[cad...@labmachine, -i,
> C:/apps/putty/priv/chuck.ppk, ls /tmp/foo],
> executable=C:/apps/putty/PLINK.EXE, timeout=9223372036854775807,
> outFile=null, workingDir=null] had exit value 0
> [ foo] ExecResultConverter WARN
> Received null stdout of the ExecResult for conversion!
> [ foo] DefaultTypeConverter WARN
> Overriding type converter from: StaticMethodTypeConverter: public static
> java.lang.String
> org.apache.camel.component.exec.ExecResultConverter.convertToString(org.apache.camel.component.exec.ExecResult,org.apache.camel.Exchange)
> throws java.io.FileNotFoundException to:
> org.apache.camel.impl.converter.tostringtypeconver...@1e3d24a
> [ foo] cameltest INFO
> Exchange[ExchangePattern:InOnly,
> BodyType:org.apache.camel.component.exec.ExecResult,
> Body:org.apache.camel.component.exec.execres...@d767dc]
> {quote}
> And from that point on, even if I add files to the directory again, I get
> nothing back, just the following log section over and over. It seems that
> the behavior of suddenly switching the converter to ToStringTypeConverter had
> the effect of suppressing all output for good.
> {quote}
> [ foo] ExecProducer INFO
> Executing ExecCommand [args=[cad...@labmachine, -i,
> C:/apps/putty/priv/chuck.ppk, ls /tmp/foo],
> executable=C:/apps/putty/PLINK.EXE, timeout=9223372036854775807,
> outFile=null, workingDir=null]
> [ foo] ExecProducer INFO The
> command ExecCommand [args=[cad...@labmachine, -i,
> C:/apps/putty/priv/chuck.ppk, ls /tmp/foo],
> executable=C:/apps/putty/PLINK.EXE, timeout=9223372036854775807,
> outFile=null, workingDir=null] had exit value 0
> [ foo] cameltest INFO
> Exchange[ExchangePattern:InOnly,
> BodyType:org.apache.camel.component.exec.ExecResult,
> Body:org.apache.camel.component.exec.execres...@3aacb4]
> {quote}
> This behavior is certainly unexpected and undesireable. I've been working
> around this by making my remote script always produce some dummy output when
> they otherwise have nothing to return, but any workaround I could use on the
> Camel side pending a more permanent fix would be very much appreciated.
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