Henrik Wingerei created SOLR-5597:
-------------------------------------
Summary: ClassCastException occurs when importing CLOB-fields
using SqlEntityProcessor and SortedMapBackedCache
Key: SOLR-5597
URL: https://issues.apache.org/jira/browse/SOLR-5597
Project: Solr
Issue Type: Bug
Components: contrib - DataImportHandler
Affects Versions: 4.6
Reporter: Henrik Wingerei
Using the SqlEntityProcessor with the SortedMapBackedCache as cache
implementation, gives the following ClassCastException when trying to import a
field of type oracle.sql.CLOB.
2014-01-02 09:32:19,143 [ERROR] [Thread-54] Exception in entity :
<field-name>:java.lang.ClassCastException: oracle.sql.CLOB cannot be cast to
java.lang.Comparable
at java.util.TreeMap.getEntry(TreeMap.java:325)
at java.util.TreeMap.get(TreeMap.java:255)
at
org.apache.solr.handler.dataimport.SortedMapBackedCache.add(SortedMapBackedCache.java:61)
at
org.apache.solr.handler.dataimport.DIHCacheSupport.populateCache(DIHCacheSupport.java:124)
at
org.apache.solr.handler.dataimport.DIHCacheSupport.getSimpleCacheData(DIHCacheSupport.java:199)
at
org.apache.solr.handler.dataimport.DIHCacheSupport.getCacheData(DIHCacheSupport.java:147)
at
org.apache.solr.handler.dataimport.EntityProcessorBase.getNext(EntityProcessorBase.java:129)
at
org.apache.solr.handler.dataimport.SqlEntityProcessor.nextRow(SqlEntityProcessor.java:75)
at
org.apache.solr.handler.dataimport.EntityProcessorWrapper.nextRow(EntityProcessorWrapper.java:243)
at
org.apache.solr.handler.dataimport.DocBuilder.buildDocument(DocBuilder.java:469)
at
org.apache.solr.handler.dataimport.DocBuilder.buildDocument(DocBuilder.java:495)
at
org.apache.solr.handler.dataimport.DocBuilder.buildDocument(DocBuilder.java:408)
at
org.apache.solr.handler.dataimport.DocBuilder.doFullDump(DocBuilder.java:323)
at
org.apache.solr.handler.dataimport.DocBuilder.execute(DocBuilder.java:231)
at
org.apache.solr.handler.dataimport.DataImporter.doFullImport(DataImporter.java:411)
at
org.apache.solr.handler.dataimport.DataImporter.runCmd(DataImporter.java:476)
at
org.apache.solr.handler.dataimport.DataImporter$1.run(DataImporter.java:457)
-- org.apache.solr.handler.dataimport.EntityProcessorWrapper
It seems that this occurs because the SortedMapBackedCache uses a
java.util.TreeMap as the underlying cache, and TreeMap requires that all
elements implements the java.lang.Comparable interface. However oracle.sql.CLOB
does not implement Comparable and the import fails when the TreeMap
implementation tries to cast the element to a Comparable (this occurs on line
325 in TreeMap.java - java version 1.6.0_33).
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