Path: csiph.com!x330-a1.tempe.blueboxinc.net!usenet.pasdenom.info!weretis.net!feeder4.news.weretis.net!eternal-september.org!feeder.eternal-september.org!.POSTED!not-for-mail
From: markspace <-@.>
Newsgroups: comp.lang.java.programmer
Subject: Re: How do I figure out what class method is annotated with @Id?
Date: Thu, 22 Sep 2011 11:49:50 -0700
Organization: A noiseless patient Spider
Lines: 28
Message-ID: <j5g00i$n2i$1@dont-email.me>
References: <46e27630-0633-49fb-975b-a4e78d787655@v7g2000yqk.googlegroups.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Injection-Date: Thu, 22 Sep 2011 18:49:54 +0000 (UTC)
Injection-Info: mx04.eternal-september.org; posting-host="XjIWM99mD7Ijfdu600oVPA"; logging-data="23634"; mail-complaints-to="abuse@eternal-september.org";	posting-account="U2FsdGVkX1+LdDZKgiZwxGOqkWsO37nC5yzOCVMj7CA="
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:6.0.2) Gecko/20110902 Thunderbird/6.0.2
In-Reply-To: <46e27630-0633-49fb-975b-a4e78d787655@v7g2000yqk.googlegroups.com>
Cancel-Lock: sha1:B0gDioK4xShHDQJhceBOtDv1N3I=
Xref: x330-a1.tempe.blueboxinc.net comp.lang.java.programmer:8214

On 9/22/2011 11:42 AM, laredotornado wrote:
> Hi,
>
> I'm using Java 6 with the latest version of Hibernate.  I have several
> POJOs, all of which have exactly one method annotated with
> "javax.persistence.Id".  For example, one class has ...
>
>     @Id
>     @Column(name="ID")
>     public Integer getID() {
>        return ID;
>     }
>
> Given a java.lang.Class, how do I figure out what method is annotated
> with the "@Id" annotation?  Thanks, - Dave


I think my first question is "Why do you want to do that?"  It sounds 
like a very very bad idea.  You shouldn't be messing around with those 
entities at all, let the persistence layer handle that.  Your access to 
"id" should come from some higher level of business logic.

If you must (not recommending):
<http://download.oracle.com/javase/tutorial/reflect/index.html>

<http://download.oracle.com/javase/6/docs/api/java/lang/Class.html#getAnnotations%28%29>