Thank you for your answer. I tried the different syntax and had the same error. I don’t think that the error comes from the constructor. In fact :

...

BigInteger:new("12345678901234567890”) returns an error and BigInteger:new("1234567890123456789”) runs correctly

I think that BaseX try to match the java type “BigInteger" into a XQuery type "xs:integer” which is not possible when the value is too big. And no syntax allows to avoid this mapping. Is it possible ? Thank you in advance André

On 5 Apr 2019, at 12:46, Martin Honnen <martin.honnen@gmx.de> wrote:

Am 05.04.2019 um 11:15 schrieb Andre Bovy:

...

Hi Chistian,

I am trying to use a very Big Integer in BaseX (9.1.2)

With this value : declare namespace BigInteger = "java:java.math.BigInteger";

BigInteger:new("12345678901234567890”)

I received : Cannot convert xs:string to xs:integer: "12345678901234567890”.

The java method that I used returns a BigInteger, but I just need the value as a String.

If you have the BigInteger returned from your Java method and want it as an XQuery string try

let $s as xs:string := BigInteger:toString($valueFromJavaMethod)

or

let $s as xs:string := $valueFromJavaMethod => BigInteger:toString()

e.g. a complete example that works for me with BaseX 9 is

declare namespace BigInteger = "java:java.math.BigInteger";

let $s as xs:string := BigInteger:TEN() => BigInteger:toString() return $s

Not sure about that problem with the constructor, with Saxon

declare namespace BigInteger = "java:java.math.BigInteger";

let $s as xs:string := BigInteger:new("12345678901234567890") => BigInteger:toString() return $s

runs fine as well but with BaseX I get the error you mentioned.

In fact, I am converting an X509 certificate (Base64) into XML and some of the properties of the certificates are BigInteger. No problem, I just write a small class which will do the translation into String Perhaps a topic to add in the CRYPTO module Thank you, André

On 5 Apr 2019, at 15:52, Christian Grün <christian.gruen@gmail.com> wrote:

Hi André,

...

I think that BaseX try to match the java type “BigInteger" into a XQuery type "xs:integer” which is not possible when the value is too big.

Exactly, that’s why.

If there’s a chance to write your code in plain XQuery, then I would definitely recommend that. You indicated that you need the result as string: Do you want to check if your input is a valid integer value?

Best, Christian