Started testing Java9 with log4j 1.2, SLF4J and logback projects

[Ceki Gülcü]

Hi Rory,

Thank you for the pointer to JEP 223.

Logback would also fail to parse the new java.version property. I 
created issue LOGBACK-1260 (See [1]) to track this problem which I 
expect will be fixed in version 1.2.2, that is the next release of logback.

In the context of SLF4J, the build of the slf4j-log4j12 module fails 
since log4j can no longer correctly detect the version of Java and shuts 
down MDC support. In short, the changes introduced in JEP 223 have 
significant consequences for log4j 1.2.x and by ricochet for SLF4J.

Best regards,

--
Ceki Gülcü

[1] https://jira.qos.ch/browse/LOGBACK-1260

On 2/14/2017 11:26, Rory O'Donnell wrote:
> Hi Ceki,
>
> Can you read  JEP 223 <http://openjdk.java.net/jeps/223> it describes
> how the new version string is implemented in JDK 9.
>
> Is logback working with JDK 9 ?
>
> Rgds,Rory
>
> On 14/02/2017 10:10, Ceki Gülcü wrote:
>>
>> Hi All,
>>
>>
>> We started testing SLF4J and logback projects using Java 9, more
>> specifically build 154. As such, I would appreciate if you could add
>> the following details onto the Quality Outreach wiki page.
>>
>> Contact: Ceki Gülcü
>> SLF4J mailing list  slf4j-dev AT qos DOT ch
>> Logback mailing list logback-dev AT qos DOT ch
>>
>> Initial testing results
>> =======================
>>
>> Initial testing indicates that log4j version 1.2.x is unable to parse
>> the result of the call System.getProperties("java.version"). The
>> returned string is "9-ea". However, log4j 1.2.x expects a string in
>> the form "1\.*", for example "1.6", "1.7" etc.
>>
>> If the string is not in the correct form, log4j 1.2.x conservatively
>> assumes that it is running under Java 1.1 and disables certain
>> important functions, such as MDC support. The code in question is the
>> static initializer of the org.apache.log4j.helpers.Loader class.
>>
>> Log4j 1.2.x is no longer maintained. However, there are innumerably
>> many projects which still use log4j 1.2.x.
>>
>> I would suggest that the string returned be in the form "1\.9*" such as
>> "1.9EA" so as not to break log4j 1.2.x under Java 9.
>>
>> Many thanks in advance for taking the above into consideration.
>>
>> Best regards,
>>
>> --
>> Ceki Gülcü
>>
>>
>>
>
> --
> Rgds,Rory O'Donnell
> Quality Engineering Manager
> Oracle EMEA , Dublin, Ireland
>