How can I solve Modularity related issue ?

[Ichiroh Takiguchi]

Hello Alan and Mandy.

I appreciate your explanation and action.

Also I read Lance's mail.
http://mail.openjdk.java.net/pipermail/core-libs-dev/2018-September/055780.html

I verified Lance's patch, it worked...

Many thanks,
Ichiroh Takiguchi
IBM Japan, Ltd.

On 2018-09-29 09:35, Mandy Chung wrote:
> On 9/28/18 1:59 AM, Alan Bateman wrote:
>> On 28/09/2018 08:28, Ichiroh Takiguchi wrote:
>>> Hello.
>>> 
>>> One of JDBC application with JavaDB did not work on JDK12.
>>> Following exception happened:
>>>   java.sql.SQLException: No suitable driver found for 
>>> jdbc:derby:xxxxxx
>>> 
>>> I assume, this issue related Modularity feature...
>>> I could not solve this issue by myself.
>> I suspect this is related to the de-privileging of the java.sql.rowset 
>> module in JDK 9. The java.sql.rowset module is mapped to the platform 
>> class loader whereas historically the types in this module were 
>> defined by the boot class loader. This is relevant because 
>> java.sql.rowset is making use of the java.sql.DriverManager (in the 
>> java.sql module) and DriverManager is caller sensitive so it sees the 
>> caller coming from java.sql.rowset. This is problematic because the 
>> JDBC driver is on the class path and is not visible to the caller's 
>> class loader. The visibility check has always been in JDBC and I 
>> suspect this usage in the JDBC Rowset implementation only worked by 
>> accident in the past because DriverManager used the TCCL when called 
>> from code defined to the bootstrap class loader. I'm sure Lance will 
>> jump in but all previous investigations into changing behavior going 
>> back 20+ has come to nothing due to compatibility concerns.
>> 
> 
> It does look like related to the de-privileging of java.sql.rowset
> module.  JDBC rowset implementation just happened to work in the past
> as it was defined to the bootstrap class loader.
> 
> I have created JBS issue for this:
>    https://bugs.openjdk.java.net/browse/JDK-8211295
> 
> Mandy