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

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java.lang.NullPointerException:
at oracle.jdbc.driver.T4CNamedTypeAccessor.unmarshalOneRow(T4CNamedTypeAccessor.java:137)
at oracle.jdbc.driver.T4CTTIrxd.unmarshal(T4CTTIrxd.java:792)
at oracle.jdbc.driver.T4CTTIrxd.unmarshal(T4CTTIrxd.java:708)
at oracle.jdbc.driver.T4C8Oall.receive(T4C8Oall.java:530)
at oracle.jdbc.driver.T4CCallableStatement.doOall8(T4CCallableStatement.java:181)
at oracle.jdbc.driver.T4CCallableStatement.execute_for_rows(T4CCallableStatement.java:870)
at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1081)
at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:2905)
at oracle.jdbc.driver.OraclePreparedStatement.execute(OraclePreparedStatement.java:2996)
at oracle.jdbc.driver.OracleCallableStatement.execute(OracleCallableStatement.java:4120)
at org.apache.commons.dbcp.DelegatingCallableStatement.execute(DelegatingCallableStatement.java:269)

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