[Engine-devel] java 1.6 compatibility no more?

[Juan Hernandez]

On 07/19/2012 01:39 PM, Yair Zaslavsky wrote:
> On 07/19/2012 02:31 PM, Vojtech Szocs wrote:
>>> Don't we need that (the source part) to avoid Java 7 syntax in GWT code?
>>
>> That's a very good point.
>>
>> In general, GWT compiler supports Java 5 syntax (note that there are no language changes between Java 5 and 6). For this reason, our frontend code should be compliant with Java 5. If someone uses new Java 7 language features in frontend code, GWT compiler will throw an error and the build will fail.
>>
>> So the 'Java 5 only' limitation applies to frontend code and any other code (e.g. shared modules) that is directly referenced by frontend code. This shouldn't affect the backend, however.
>>
>> We could do something like this:
>>
>> - let oVirt root POM declare source and target compliance to Java 7
>> - let frontend modules POM (frontend/webadmin/modules/pom.xml) declare source compliance to Java 5 (or 6)
>>
>> (note that target compliance can be left to Java 7 since frontend compilation results in JavaScript code)
>>
>> What do you think?
>>
>> Vojtech
> 
> +1 - I really like this idea!

+1 from me as well.

>> ----- Original Message -----
>> From: "Juan Hernandez" <jhernand at redhat.com>
>> To: "Vojtech Szocs" <vszocs at redhat.com>
>> Cc: "Yair Zaslavsky" <yzaslavs at redhat.com>, engine-devel at ovirt.org
>> Sent: Thursday, July 19, 2012 11:01:00 AM
>> Subject: Re: [Engine-devel] java 1.6 compatibility no more?
>>
>> On 07/19/2012 10:09 AM, Vojtech Szocs wrote:
>>>> As I previously emailed - JDK7 already fixed a known issue with ldap and
>>>> DNS ,and made one of my patches at gerrit redundant.
>>>> Why not enjoy the bug fixes?
>>>
>>> I agree, but in that case, why not switch to '1.7' Java source/target compliance for oVirt Maven build as well?
>>>
>>> If JDK6 cannot be used for building oVirt (because of missing Java 7 APIs, because of LDAP/DNS issues in JDK6, etc.), we should also update our Maven POM files. Currently, when I import oVirt projects into Eclipse (using Eclipse Maven plugin), I'm getting compile errors on 'bll' project. This is because our Maven POM files declare '1.6' Java source/target compliance.
>>>
>>> Juan - you are right, but for me, it sounds quite strange to have '1.6' Java source/target compliance for Maven build, and use JDK7 to do the build.
>>
>> Don't we need that (the source part) to avoid Java 7 syntax in GWT code?
>>
>>> ----- Original Message -----
>>> From: "Yair Zaslavsky" <yzaslavs at redhat.com>
>>> To: engine-devel at ovirt.org
>>> Sent: Thursday, July 19, 2012 7:59:45 AM
>>> Subject: Re: [Engine-devel] java 1.6 compatibility no more?
>>>
>>> On 07/18/2012 08:21 PM, Juan Hernandez wrote:
>>>> On 07/18/2012 06:33 PM, Vojtech Szocs wrote:
>>>>> In fact, for both backend and frontend, Maven effective POM contains:
>>>>>
>>>>> <artifactId>maven-compiler-plugin</artifactId>
>>>>> <configuration>
>>>>>   <source>1.6</source>
>>>>>   <target>1.6</target>
>>>>> </configuration>
>>>>>
>>>>> Therefore, according to Maven POM files, oVirt should be build-able using Java 6, but it's not. (?)
>>>>
>>>> These maven settings just tell the java compiler to accept Java 6 syntax
>>>> only and to generate a Java 6 compatible .class file format, but they
>>>> don't restrict the set of APIs that can be used.
>>>>
>>>>> The problem is in backend/manager/modules/bll: StorageDomainCommandBase class uses new Java 7 Long.compare() static method.
>>>>>
>>>>> I think we should decide if we want to be compliant with Java 7, or submit a patch that uses Java 6 API (Long.compareTo instance method).
>>>>>
>>>>> Vojtech
>>>
>>> As I previously emailed - JDK7 already fixed a known issue with ldap and
>>> DNS ,and made one of my patches at gerrit redundant.
>>> Why not enjoy the bug fixes?
>>>
>>>>>
>>>>>
>>>>> ----- Original Message -----
>>>>> From: "Laszlo Hornyak" <lhornyak at redhat.com>
>>>>> To: "engine-devel" <engine-devel at ovirt.org>
>>>>> Cc: "Vojtech Szocs" <vszocs at redhat.com>
>>>>> Sent: Wednesday, July 18, 2012 5:43:34 PM
>>>>> Subject: java 1.6 compatibility no more?
>>>>>
>>>>> Hi,
>>>>>
>>>>> It may be a historic moment, but for a few hours oVirt engine is no longer building on java 1.6.
>>>>> Is this intentional?
>>>>>
>>>>> Laszlo


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