Maven 第一次抱怨@Override 注释，但下次编译成功

Question

I run command like this:

mvn tomcat:redeploy 

as see a lot of errors like "...of type ImageDaoImpl must override a superclass method"

But after this I do nothing, just run this command again and this time it compiles ok! Could anyone tell me how to fix that? Every odd compilation time I get this error, it's quite annoying..

Answer 1

我无法立即告诉您问题为何会消失，但通常此编译器错误表明您正在尝试使用设置为 Java 5 合规性的编译器来编译 Java 6 兼容代码（允许 @Override 实现接口）（它只允许 @Override 在覆盖超类的具体方法时使用）。

Answer 2

I've just resolved my issue) I have two plugins:

<plugin>
    <groupId>org.codehaus.mojo</groupId>
    <artifactId>aspectj-maven-plugin</artifactId>
    <configuration>
        <source>1.5</source>
        <complianceLevel>1.5</complianceLevel>
    </configuration>
...
</plugin>
<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-compiler-plugin</artifactId>
    <configuration>
        <source>${jdk.version}</source>
        <target>${jdk.version}</target>
    </configuration>
</plugin>

The first plugin was configured for 1.5 java the other was configured by ${jdk.version} which is 1.6 It's still a mystery for me why it compiles at all, but after setting 1.5 to 1.6 my issue has gone.