Thanks for your support, below works for us.
SQLTypeInfo sqlType = new H2TypeInfo(
"NVARCHAR", // String typeName
(short)Types.NVARCHAR, // short dataType
2147483647, // int precision
"'", // String literalPrefix
"'", // String literalSuffix
"LENGTH", // String createParams
1, // int nullable
true, // boolean caseSensitive
(short)3, // short searchable
false, // boolean unsignedAttribute
false, // boolean fixedPrecScale
false, // boolean autoIncrement
"NVARCHAR", // String localTypeName
(short)0, // short minimumScale
(short)0, // short maximumScale
0 // int numPrecRadix
);
addSQLTypeForJDBCType(handler, mconn, (short)Types.NVARCHAR, sqlType, true);
