On 2011-10-10 1:28 PM, Stephen Connolly wrote:
On 10 October 2011 21:15, Eric Kolotyluk<eric.koloty...@gmail.com> wrote:
OK, I still clearly do not understand how sniffer is supposed to work, and
it does not look like am going to any time soon, even after all these
explanations.
As it is, I am making better progress now just by specifying the Java 5
compiler in my maven-compiler-plugin. It complains right away when the
artifact has Java 6 class files in it and prints an error message
identifying the troublesome jar file. I am not really sure why no-one
recommended this to me in the first place as it effective and simple to
understand.
Again, I am at a complete loss to fathom any utility in the sniffer. Maybe I
am just too stupid to get it.
Cheers, Eric
On 2011-10-10 9:49 AM, Wayne Fay wrote:
The problem is I cannot figure out the intent of how the sniffer is
supposed
to work - in particular if it will even help with my particular problem.
As
far as I can tell the Hibernate folks have not set up the necessary
signatures for the sniffer to tell me what I need to know.
You should not need to set up signatures. The community has already
done that for you. Just use an artifact under the groupId
org.codehaus.mojo.signature and specify the Java version you are
looking to target (most likely java15-sun in your case).
I do not know what you mean...
When generating signatures, are we supposed to create a separate Maven
project/artifact for the signature? For example
I don't believe this is something you need to worry about. Just use
the existing signatures. Why would you be generating signatures
anyway?
I have no idea because I do not know what the intent of the sniffer is or
how it is supposed to work.
The intent of animal sniffer is to allow you to use
<source>1.5</source> with a 1.6 JDK and not accidentally link to
methods like java.lang.String#isEmpty()
OK, that is useful because I had exactly that same case. In the end I
had to figure it out by actually using a 1.5 JDK. That particular
sentence would be extremely valuable on the introduction page
http://mojo.codehaus.org/animal-sniffer-maven-plugin/
Setting the source to 1.5 will only flush out the class format... the
signatures of methods used can only be enforced by the sniffer.
Excellent point! This would also be extremely valuable to document on
the introduction page
You run it on all your classes with the signatures you want to enforce
on your code... if you use a method outside those signatures it will
fail the build for you.
Sounds good - unfortunately based on all the examples I have seen - how
to actually configure a POM to do this is a huge mystery still.
I can say without a doubt, the animal-sniffer-maven-plugin is by far the
most abstruse plugin I have yet encountered.
- Eric
HTH
-Stephen
It is not that I need 1.6 features - it is that somewhere I am pulling in
a
JAR file via Maven that has version 50 class files from Java 6 and the
Java
5 run time can only recognize version 49 or earlier. I am trying to pin
down
which JAR file exactly, and then determine if there is an earlier version
of
the artifact that has version 49 class files.
If you set up the plugin properly, it should check all of YOUR code to
ensure it only uses JDK5 APIs. It will not help with code in your
dependencies (that I am aware of at least).
If you want to check the Hibernate artifacts (jars), you should
probably just use the Animal Sniffer ant tasks and write a little Ant
to compare each Hibernate jar against the jdk15 signature:
http://mojo.codehaus.org/animal-sniffer/animal-sniffer-ant-tasks/examples/checking-signatures.html
Wayne
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