java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at oracle.jdbc.driver.ScrollableResultSet.getCachedDatumValueAt(ScrollableResultSet.java:1307)
at oracle.jdbc.driver.ScrollableResultSet.getOracleObject(ScrollableResultSet.java:398)
at oracle.jdbc.driver.ScrollableResultSet.getLong(ScrollableResultSet.java:463)
at com.solarmetric.datasource.ResultSetWrapper.getLong(ResultSetWrapper.java:156)
at com.solarmetric.kodo.impl.jdbc.schema.dict.AbstractDictionary.longFromSQL(AbstractDictionary.java:573)
at com.solarmetric.kodo.impl.jdbc.ormapping.ClassMapping.getObjectId(ClassMapping.java:859)
at com.solarmetric.kodo.impl.jdbc.runtime.JDBCStoreManager.createFromResultSet(JDBCStoreManager.java:960)
at com.solarmetric.kodo.impl.jdbc.runtime.JDBCStoreManager$2.getResultObject(JDBCStoreManager.java:1146)
at com.solarmetric.kodo.impl.jdbc.runtime.LazyResultList.instantiateRow(LazyResultList.java:199)
at com.solarmetric.kodo.impl.jdbc.runtime.LazyResultList.get(LazyResultList.java:142)
at com.solarmetric.kodo.runtime.objectprovider.ResultListIterator.next(ResultListIterator.java:49)
at de.tolina.kontodispo.logic.MainController.processClassificationsAll(MainController.java:338)

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