I try to save data in the oracle CLOB field. I declared a field in my Entity
bean: 
 @Lob private String data;      
Ther#s not much to do wrong, isn't it?  But I have an exception thrown:

Caused by: <openjpa-1.0.2-r420667:627158 nonfatal general error>
org.apache.openjpa.persistence.PersistenceException: oracle.sql.CLOB in
classloader org.apache.geronimo.configs/openjpa/2.1.1/car
        at
org.apache.openjpa.jdbc.sql.DBDictionary.newStoreException(DBDictionary.java:3946)
        at
org.apache.openjpa.jdbc.sql.SQLExceptions.getStore(SQLExceptions.java:97)
        at
org.apache.openjpa.jdbc.sql.SQLExceptions.getStore(SQLExceptions.java:83)
        at
org.apache.openjpa.jdbc.sql.SQLExceptions.getStore(SQLExceptions.java:59)
        at
org.apache.openjpa.jdbc.kernel.PreparedStatementManagerImpl.flush(PreparedStatementManagerImpl.java:75)
        at
org.apache.openjpa.jdbc.kernel.OperationOrderUpdateManager.flushPrimaryRow(OperationOrderUpdateManager.java:203)
        at
org.apache.openjpa.jdbc.kernel.OperationOrderUpdateManager.flush(OperationOrderUpdateManager.java:89)
        at
org.apache.openjpa.jdbc.kernel.AbstractUpdateManager.flush(AbstractUpdateManager.java:89)
        at
org.apache.openjpa.jdbc.kernel.AbstractUpdateManager.flush(AbstractUpdateManager.java:72)
        at
org.apache.openjpa.jdbc.kernel.JDBCStoreManager.flush(JDBCStoreManager.java:514)
        at
org.apache.openjpa.kernel.DelegatingStoreManager.flush(DelegatingStoreManager.java:130)
        ... 37 more
Caused by: java.sql.SQLException: oracle.sql.CLOB in classloader
org.apache.geronimo.configs/openjpa/2.1.1/car
        at
org.apache.openjpa.jdbc.sql.OracleDictionary.getEmptyClob(OracleDictionary.java:1016)
        at
org.apache.openjpa.jdbc.sql.OracleDictionary.setNull(OracleDictionary.java:514)
        at
org.apache.openjpa.jdbc.sql.DBDictionary.setTyped(DBDictionary.java:1090)
        at org.apache.openjpa.jdbc.sql.RowImpl.flush(RowImpl.java:888)
        at org.apache.openjpa.jdbc.sql.RowImpl.flush(RowImpl.java:848)
        at
org.apache.openjpa.jdbc.kernel.PreparedStatementManagerImpl.flushInternal(PreparedStatementManagerImpl.java:95)
        at
org.apache.openjpa.jdbc.kernel.PreparedStatementManagerImpl.flush(PreparedStatementManagerImpl.java:73)

What's wrong about it?
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