blocks|key|1104314|text|用于已实现方法的@Override标记是Java1.6的新特性。在Java1.5中，只有在覆盖基类中的方法时，@Override才是正确的。阅读更多here和here。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1104315|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/94361/when-do-you-use-javas-override-annotation-and-why|1|https://stackoverflow.com/questions/1407198/eclipse-ignoring-incorrect-override-annotations^0|8|9|1J|9|22|4|0|27|4|1|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]|$9|S|A|T|B|C]]|D|@$9|U|A|V|1|W]|$9|X|A|Y|1|Z]]|E|$]]|$1|F|3|-4|5|6|7|10|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]|N|$5|I|J|K|E|$L|O]]]]

<code>@Override</code> tags for implemented methods are new to Java 1.6. In Java 1.5 <code>@Override</code> is only correct when overriding a method in a base class. Read more <a href="https://stackoverflow.com/questions/94361/when-do-you-use-javas-override-annotation-and-why">here</a> and <a href="https://stackoverflow.com/questions/1407198/eclipse-ignoring-incorrect-override-annotations">here</a>.

blocks|key|1104392|text|@Override注释规范在Java1.6中发生了变化。在Java1.5中，编译器不允许在已实现的接口方法上使用@Override注释，但在1.6中允许。我找到的第一个搜索结果是一个blog+post+here.。It+was+not+well+documented，但它确实改变了。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1104393|Eclipse之所以添加它，是因为您的Eclipse是为1.6兼容性设置的。您应该尽量将构建环境和eclipse环境保持在同一版本的Java上。我不清楚您是否指定Cruise+Control正在运行Java5，它是否正在使用单独的JDK6进行编译。|1104394|与上面1.5vs1.6Eclipse注释规则不同，请记住@Override有自己的编译器实现(而不是javac)，并且偶尔会有不同的行为。每当在Eclipse中编译某些东西，而不是Ant或Maven时，您将需要找到一种方法来使两个编译器都满意。|1104395|​|1104396|📷|atomic|1104397|1104398|entityMap|0|LINK|mutability|MUTABLE|url|http://dertompson.com/2008/01/25/override-specification-changes-in-java-6/|1|http://blogs.oracle.com/ahe/entry/override_snafu|2|IMAGE|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/44093bfb0e58cc854528aadf6839e00c.png|imageAlt^0|0|9|1K|9|2J|F|0|32|N|1|0|0|S|9|1E|5|0|0|0|1|2|0|0^^$0|@$1|2|3|4|5|6|7|15|8|@$9|16|A|17|B|C]|$9|18|A|19|B|C]]|D|@$9|1A|A|1B|1|1C]|$9|1D|A|1E|1|1F]]|E|$]]|$1|F|3|G|5|6|7|1G|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|1H|8|@$9|1I|A|1J|B|C]|$9|1K|A|1L|B|C]]|D|@]|E|$]]|$1|J|3|K|5|6|7|1M|8|@]|D|@]|E|$]]|$1|L|3|M|5|N|7|1N|8|@]|D|@$9|1O|A|1P|1|1Q]]|E|$]]|$1|O|3|K|5|6|7|1R|8|@]|D|@]|E|$]]|$1|P|3|-4|5|6|7|1S|8|@]|D|@]|E|$]]]|Q|$R|$5|S|T|U|E|$V|W]]|X|$5|S|T|U|E|$V|Y]]|Z|$5|10|T|11|E|$12|13|14|-4]]]]

The <code>@Override</code> annotation spec changed in Java 1.6. In Java 1.5, the compiler did not allow the <code>@Override</code> annotation on implemented interface methods, but in 1.6 it does. First search result I found is a <a href="http://dertompson.com/2008/01/25/override-specification-changes-in-java-6/" rel="nofollow noreferrer">blog post here.</a>. It <a href="http://blogs.oracle.com/ahe/entry/override_snafu" rel="nofollow noreferrer">was not well documented</a>, but it did change.

Eclipse is adding it because your Eclipse is set for 1.6 compliance. You should try to keep your build and eclipse environments on the same version of Java. It's unclear to me by your specifying Cruise Control is running Java 5 on whether or not it is compiling using a separate JDK6 or not.

Separate from the above 1.5 vs 1.6 <code>@Override</code> annotation rules, remember that Eclipse has its own compiler implementation (not <code>javac</code>) and will occasionally have different behavior. Whenever something compiles in Eclipse, but not Ant or Maven, you will need to find a way to make both compilers happy.

<img src="https://i.stack.imgur.com/Ytnyd.png" alt="Here&#39;s a screenshot of changing the compiler in eclipse">

blocks|key|1319315|text|Eclipse将指向1.6版的Java，而不是1.5版。用于在eclipse中配置java版本的See+here。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1319316|entityMap|0|LINK|mutability|MUTABLE|url|http://help.eclipse.org/help33/index.jsp?topic=/org.eclipse.jst.j2ee.doc.user/topics/tchangejavalevel.html^0|1C|8|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

Eclipse would be pointing to 1.6 version of Java rather than 1.5.
<a href="http://help.eclipse.org/help33/index.jsp?topic=/org.eclipse.jst.j2ee.doc.user/topics/tchangejavalevel.html" rel="nofollow noreferrer">See here</a> for configuring java version in eclipse.

blocks|key|1319326|text|很多人，包括我，都被这件事搞砸了。See+here+for+a+bigger+SO+discussion|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1319327|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/1678122/must-override-a-superclass-method-errors-after-importing-a-project-into-eclips^0|H|Z|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

A lot of people, including me, got busted by this. <a href="https://stackoverflow.com/questions/1678122/must-override-a-superclass-method-errors-after-importing-a-project-into-eclips">See here for a bigger SO discussion</a>

blocks|key|1104486|text|确保该接口只有一个定义。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1104487|示例:+HttpServletRequest|1104488|这是一个根据提供商的不同规格的接口。|1104489|比较pax-web-jetty和apache-felix+jetty。他们有不同的方法。|1104490|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|L|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|M|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

Ensure that there is only one definition of that interface.

Example: 
 HttpServletRequest

This is an interface with different specs depending on provider.

Compare pax-web-jetty and apache-felix-jetty. They have different methods.

blocks|key|1104520|text|在使用ANT构建项目时，我也遇到了同样的问题。该问题的解决方案是更改build.properties文件中的以下属性：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1104521|javac.compiler=org.eclipse.jdt.core.JDTCompilerAdapter|code-block|syntax|javascript|1104522|至：|1104523|javac.compiler=modern|1104524|这解决了问题，项目被成功编译和部署。|1104525|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

I have had the same problem when building a project with ANT. The solution to the problem was to change the following property inside the build.properties file: 

<pre><code>javac.compiler=org.eclipse.jdt.core.JDTCompilerAdapter
</code></pre>

to:

<pre><code>javac.compiler=modern
</code></pre>

That solved the problem and the project got compiled and deployed successfully.

Eclipse is adding @Override annotations when I implement methods of an interface. Eclipse seems to have no problem with this. And our automated build process from Cruise Control seems to have no problem with this. But when I build from the command-line, with ant running javac, I get this error:

<pre><code>[javac] C:\path\project\src\com\us\MyClass.java:70: method does not override a method from its superclass
[javac] @Override
[javac] ^
[javac] 1 error
</code></pre>

Eclipse is running under Java 1.6. Cruise Control is running Java 1.5. My ant build fails regardless of which version of Java I use.

Why is javac failing on @Override annotation

编译器

Eclipse

Java

当我实现接口的方法时，Eclipse会添加@Override注释。Eclipse在这方面似乎没有问题。我们来自Cruise Control的自动化构建过程似乎对此没有问题。但是当我从命令行构建时，在ant运行javac的情况下，我得到了这个错误：[javac] C:\path\project\src\com\us\My...

问为什么javac在@Override注解上失败
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