sql procedure output value been truncated

Driver version

7.0.0.jre8

SQL Server version

Microsoft SQL Server 2017 (RTM) - 14.0.1000.169 (X64) Aug 22 2017 17:04:49 Copyright © 2017 Microsoft Corporation Enterprise Edition (64-bit) on Windows Server 2016 Datacenter 10.0 <X64> (Build 14393: ) (Hypervisor)

Client Operating System

windows server 2016 datacenter

JAVA/JVM version

openjdk version “1.8.0_191”

Table schema

not table it is procedure

Problem description

procedure

ALTER PROCEDURE [dbo].[PROC_queryPlanReport] 
    @userId bigint,
	@pageNo int,
	@length int,
	@param varchar(255),
    @report varchar(max) output
AS
.....

when i run

declare @param varchar(max), @report varchar(max);
set @param='{"template_name":"xxxxxxx","plan_id":460}'; 
exec PROC_queryPlanReport 178,0,0, @param, @report output;
select @report;

select len(@report)

the len value is 7792

but when i call this procedure in java the @report length is 7750

why has this difference

and my commection string is jdbc:sqlserver://47.244.60.83:1433;databaseName=wdb;sendStringParametersAsUnicode=false

i already add sendStringParametersAsUnicode=false

thanks for your reply

[youngerier]

glad for you help . I resolve this problem you may close this issue 😃

[youngerier]

it’s very nice for your help . but I need automap sql result to java object .so I need use SimpleJdbcCall .finally I try cast varchar(max) to text at the end of the procedure then got full text. Thanks for your help