Stuck threads reading blob column from db table

WLS 10.3.5, JDK 1.6u29, Oracle 11g RAC, ojdbc6 latest driver
We're having problems with stuck threads trying to read a blob column from a DB table. The query to extract the blob is a simple select, without any locking such as "for update" clauses or whatever. The blob's size is <= 100k.
The thread dump shows the following stack trace:
+"[STUCK] ExecuteThread: '3' for queue: 'weblogic.kernel.Default (self-tuning)'" RUNNABLE native+
+     java.net.SocketInputStream.socketRead0(Native Method)+
+     java.net.SocketInputStream.read(SocketInputStream.java:129)+
+     oracle.net.ns.Packet.receive(Packet.java:300)+
+     oracle.net.ns.DataPacket.receive(DataPacket.java:106)+
+     oracle.net.ns.NetInputStream.getNextPacket(NetInputStream.java:315)+
+     oracle.net.ns.NetInputStream.read(NetInputStream.java:260)+
+     oracle.jdbc.driver.T4CSocketInputStreamWrapper.read(T4CSocketInputStreamWrapper.java:105)+
+     oracle.jdbc.driver.T4CMAREngine.getNBytes(T4CMAREngine.java:1517)+
+     oracle.jdbc.driver.T4C8TTILobd.unmarshalLobData(T4C8TTILobd.java:476)+
+     oracle.jdbc.driver.T4C8TTILob.readLOBD(T4C8TTILob.java:770)+
+     oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:361)+
+     oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:192)+
+     oracle.jdbc.driver.T4C8TTILob.read(T4C8TTILob.java:146)+
+     oracle.jdbc.driver.T4CConnection.getBytes(T4CConnection.java:2392)+
+     oracle.sql.BLOB.getBytes(BLOB.java:348)+
+     oracle.sql.BLOB.getBytes(BLOB.java:222)+
+     weblogic.jdbc.wrapper.Blob_oracle_sql_BLOB.getBytes(Unknown Source)+
+     com.ibatis.sqlmap.engine.type.BlobTypeHandlerCallback.getResult(BlobTypeHandlerCallback.java:33)+
+     com.ibatis.sqlmap.engine.type.CustomTypeHandler.getResult(CustomTypeHandler.java:52)+
+     com.ibatis.sqlmap.engine.mapping.result.ResultMap.getPrimitiveResultMappingValue(ResultMap.java:619)+
+     com.ibatis.sqlmap.engine.mapping.result.ResultMap.getResults(ResultMap.java:345)+
+     com.ibatis.sqlmap.engine.execution.SqlExecutor.handleResults(SqlExecutor.java:384)+
+     com.ibatis.sqlmap.engine.execution.SqlExecutor.handleMultipleResults(SqlExecutor.java:300)+
+     com.ibatis.sqlmap.engine.execution.SqlExecutor.executeQuery(SqlExecutor.java:189)+
+     com.ibatis.sqlmap.engine.mapping.statement.MappedStatement.sqlExecuteQuery(MappedStatement.java:221)+
+     com.ibatis.sqlmap.engine.mapping.statement.MappedStatement.executeQueryWithCallback(MappedStatement.java:189)+
+     com.ibatis.sqlmap.engine.mapping.statement.MappedStatement.executeQueryForList(MappedStatement.java:139)+
+     com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.queryForList(SqlMapExecutorDelegate.java:567)+
+     com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.queryForList(SqlMapExecutorDelegate.java:541)+
+     com.ibatis.sqlmap.engine.impl.SqlMapSessionImpl.queryForList(SqlMapSessionImpl.java:118)+
+     com.ibatis.sqlmap.engine.impl.SqlMapClientImpl.queryForList(SqlMapClientImpl.java:94)+
+     com.ibatis.dao.client.template.SqlMapDaoTemplate.queryForList(SqlMapDaoTemplate.java:282)"[STUCK] ExecuteThread: '3' for queue: 'weblogic.kernel.Default (self-tuning)'" RUNNABLE native+
+     java.net.SocketInputStream.socketRead0(Native Method)+
+     java.net.SocketInputStream.read(SocketInputStream.java:129)+
+     oracle.net.ns.Packet.receive(Packet.java:300)+
+     oracle.net.ns.DataPacket.receive(DataPacket.java:106)+
+     oracle.net.ns.NetInputStream.getNextPacket(NetInputStream.java:315)+
+     oracle.net.ns.NetInputStream.read(NetInputStream.java:260)+
+     oracle.jdbc.driver.T4CSocketInputStreamWrapper.read(T4CSocketInputStreamWrapper.java:105)+
+     oracle.jdbc.driver.T4CMAREngine.getNBytes(T4CMAREngine.java:1517)+
+     oracle.jdbc.driver.T4C8TTILobd.unmarshalLobData(T4C8TTILobd.java:476)+
+     oracle.jdbc.driver.T4C8TTILob.readLOBD(T4C8TTILob.java:770)+
+     oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:361)+
+     oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:192)+
+     oracle.jdbc.driver.T4C8TTILob.read(T4C8TTILob.java:146)+
+     oracle.jdbc.driver.T4CConnection.getBytes(T4CConnection.java:2392)+
+     oracle.sql.BLOB.getBytes(BLOB.java:348)+
+     oracle.sql.BLOB.getBytes(BLOB.java:222)+
+     weblogic.jdbc.wrapper.Blob_oracle_sql_BLOB.getBytes(Unknown Source)+
+     com.ibatis.sqlmap.engine.type.BlobTypeHandlerCallback.getResult(BlobTypeHandlerCallback.java:33)+
+     com.ibatis.sqlmap.engine.type.CustomTypeHandler.getResult(CustomTypeHandler.java:52)+
+     com.ibatis.sqlmap.engine.mapping.result.ResultMap.getPrimitiveResultMappingValue(ResultMap.java:619)+
+     com.ibatis.sqlmap.engine.mapping.result.ResultMap.getResults(ResultMap.java:345)+
+     com.ibatis.sqlmap.engine.execution.SqlExecutor.handleResults(SqlExecutor.java:384)+
+     com.ibatis.sqlmap.engine.execution.SqlExecutor.handleMultipleResults(SqlExecutor.java:300)+
+     com.ibatis.sqlmap.engine.execution.SqlExecutor.executeQuery(SqlExecutor.java:189)+
+     com.ibatis.sqlmap.engine.mapping.statement.MappedStatement.sqlExecuteQuery(MappedStatement.java:221)+
     com.ibatis.sqlmap.engine.mapping.statement.MappedStatement.executeQueryWithCallback(MappedStatement.java:189)
+     com.ibatis.sqlmap.engine.mapping.statement.MappedStatement.executeQueryForList(MappedStatement.java:139)+
+     com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.queryForList(SqlMapExecutorDelegate.java:567)+
+     com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.queryForList(SqlMapExecutorDelegate.java:541)+
+     com.ibatis.sqlmap.engine.impl.SqlMapSessionImpl.queryForList(SqlMapSessionImpl.java:118)+
+     com.ibatis.sqlmap.engine.impl.SqlMapClientImpl.queryForList(SqlMapClientImpl.java:94)+
+     com.ibatis.dao.client.template.SqlMapDaoTemplate.queryForList(SqlMapDaoTemplate.java:282)+
Some threads eventually end (after 1-2 hours), most of them remain there for days.
Any hint would be quite useful, thanks.

Threads are executing the actual allocated request from the Weblogic Kernel. Most of the problems happen when the Thread execution is reaching the application or business layer.
At this point your application Java code module is sending or receiving data from external sources such as a an Oracle database for example. Any problem with such external system will cause the Thread to hang and wait for data to come back.
Other situations can occur such as internal deadlock, infinite looping, heavy IO contention on your server etc.
Doesn't loo like a driver issue.
http://docs.oracle.com/cd/E21764_01/doc.1111/e14770/weblogic_server_issues.htm#autoId2
Check at the Database end
Cheers ...

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