Stream has already been closed; nested exception is java.sql.SQLException

Stream has already been closed; nested exception is java.sql.SQLException in Oracle.
Java - Oracle connectivity some times this exception will happen.
One of the reason of this exception is , the table contains a long(datatype) field.
eg: 'users' table contains a field 'age' long datatype.
To solve this problem , replace the 'long' field to 'number' datatype.