Using OpenML Java apiconnector in Matlab #1

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1. joaquinvanschoren commented on Feb 19, 2015

   

   joaquinvanschoren

   on Feb 19, 2015

   Contributor

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   I remember we had a similar issue with RapidMiner. Jan, do you remember how
   you solved that?

   On Thu Feb 19 2015 at 11:31:14 AM Manuel Martín [email protected]
   wrote:

   I tried to use Java apiconnector in Matlab R2012a but got the following
   error:

   Java exception occurred:
   java.lang.NoSuchMethodError:
   com.thoughtworks.xstream.io.xml.DomDriver.(Ljava/lang/String;Lcom/thoughtworks/xstream/io/naming/NameCoder;)V
   at org.openml.apiconnector.xstream.XstreamXmlMapping.getInstance(XstreamXmlMapping.java:63)
   at org.openml.apiconnector.io.HttpConnector.doApiRequest(HttpConnector.java:30)
   at org.openml.apiconnector.io.ApiSessionHash.openmlAuthenticate(ApiSessionHash.java:162)
   at org.openml.apiconnector.io.ApiSessionHash.update(ApiSessionHash.java:84)
   at org.openml.apiconnector.io.ApiSessionHash.set(ApiSessionHash.java:71)
   at org.openml.apiconnector.io.OpenmlConnector.(OpenmlConnector.java:89)

   This problem occurs because an older version of xstream is loaded by
   Matlab in the static java class path and therefore it's not using the
   xstream library provided in the dynamic java class path. I've been googling
   and couldn't find any elegant solution. Apparently, the only workaround
   would be to replace the xstream.jar file in the "jarext" Matlab folder with
   the new version, but that could lead to internal Matlab problems.

   So at the moment it's not possible to use the Java apiconnector in Matlab,
   but I would like to leave this comment here for future reference.

   —
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   #1.
2. janvanrijn commented on Feb 19, 2015

   

   janvanrijn

   on Feb 19, 2015

   Member

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   I didn't solve that problem yet, as there was a second problem with
   RapidMiner as well.

   A solution would be to downgrade xstream version of the apiconnector,
   but that isn't straightforward as we rely heavily on one of the new
   features.

   2015-02-20 0:57 GMT+13:00 Joaquin Vanschoren [email protected]:

   I remember we had a similar issue with RapidMiner. Jan, do you remember how
   you solved that?

   On Thu Feb 19 2015 at 11:31:14 AM Manuel Martín [email protected]
   wrote:

   I tried to use Java apiconnector in Matlab R2012a but got the following
   error:

   Java exception occurred:
   java.lang.NoSuchMethodError:

   com.thoughtworks.xstream.io.xml.DomDriver.(Ljava/lang/String;Lcom/thoughtworks/xstream/io/naming/NameCoder;)V
   at
   org.openml.apiconnector.xstream.XstreamXmlMapping.getInstance(XstreamXmlMapping.java:63)
   at
   org.openml.apiconnector.io.HttpConnector.doApiRequest(HttpConnector.java:30)
   at
   org.openml.apiconnector.io.ApiSessionHash.openmlAuthenticate(ApiSessionHash.java:162)
   at
   org.openml.apiconnector.io.ApiSessionHash.update(ApiSessionHash.java:84)
   at org.openml.apiconnector.io.ApiSessionHash.set(ApiSessionHash.java:71)
   at
   org.openml.apiconnector.io.OpenmlConnector.(OpenmlConnector.java:89)

   This problem occurs because an older version of xstream is loaded by
   Matlab in the static java class path and therefore it's not using the
   xstream library provided in the dynamic java class path. I've been
   googling
   and couldn't find any elegant solution. Apparently, the only workaround
   would be to replace the xstream.jar file in the "jarext" Matlab folder
   with
   the new version, but that could lead to internal Matlab problems.

   So at the moment it's not possible to use the Java apiconnector in
   Matlab,
   but I would like to leave this comment here for future reference.

   —
   Reply to this email directly or view it on GitHub
   #1.

   —
   Reply to this email directly or view it on GitHub
   #1 (comment).