java.io.IOException: Protocol violation

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Protocol violation
java.io.IOException: Protocol violation
at oracle.jdbc.dbaccess.DBError.SQLToIOException(DBError.java:717)
at oracle.jdbc.driver.OracleClobReader.needChars(OracleClobReader.java:222)
at oracle.jdbc.driver.OracleClobReader.read(OracleClobReader.java:163)
at java.io.Reader.read(Unknown Source)
at undefined.OracleXMLTypeQuery.main(OracleXMLTypeQuery.java:59)

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