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Change By:
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Tim Donohue
(31/Jul/13 2:40 PM)
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Description:
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In DSpace 3.2, the Lyncode XOAI module (which is used by the DSpace OAI-PMH interface) was upgraded to version 2.2.9.
Unfortunately, this version of the XOAI module seems to require Java 7 / JDK 1.7 to run properly.
See this commit: https://github.com/lyncode/xoai/commit/a25cf93b1861608d8ed2d52b224b243fb0aca511
The error you receive from the OAI-PMH interface looks like:
Caused by: java.lang.UnsupportedClassVersionError: com/lyncode/xoai/dataprovider/exceptions/ConfigurationException : Unsupported major.minor version 51.0 (unable to load class com.lyncode.xoai.dataprovider.exceptions.ConfigurationException)
at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2892)
This issue was initially reported by Sam Ottenhoff as part of this email thread:
http://dspace.2283337.n4.nabble.com/DSpace-3-2-needs-JDK-1-7-for-OAI-functionality-td4666030.html
This error seems to affect DSpace sites who are using Oracle JDK 6. It's unclear if this affects sites using OpenJDK 6 (reports that the error doesn't appear).
Upgrading to JDK 7 (Oracle or OpenJDK) would obviously fix the issue.
We'd also like to find a way to fix the Lyncode XOAI module to continue to support JDK 6 (so that DSpace 3.x continues to support JDK 6). But a fix has not yet been determined. (If anyone has determined a way to resolve this, please feel free to send us a suggested patch)
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