Java Maven 全新安装：找不到符号
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Maven clean install: cannot find symbol
提问by Jason
My Maven clean install is failing. Below is the error message.
我的 Maven 全新安装失败。下面是错误信息。
[ERROR] Failed to execute goal
org.apache.maven.plugins:maven-compiler-plugin:2.0.2:compile
(default-compile) on project MyProject: Compilation failure:
Compilation failure:
[ERROR] C:\..\MyClass.java:[13,2] cannot find symbol
[ERROR] symbol : class MyAnnotation
[ERROR] location: class mypackage.MyClass
MyClass.java
我的类
public class MyClass{
@MyAnnotation
public static class MyAnnotation{
//some static nested class code here...
}
MyAnnotation.java
我的注解
@Retention (RetentionPolicy.RUNTIME)
public @interface MyAnnotation{
}
I have no clue why this would present problems, can anyone please give me some ideas?
我不知道为什么这会出现问题，任何人都可以给我一些想法吗？
采纳答案by Jason
Found the problem...
发现问题了...
I apologize as I didn't include enough code for anyone to determine the root cause of the issue, normally I don't include import statements in my posts but this time I should have. The below class is a more full example. As we can see, the below class declares a static import to an object that resides in the static nested class (within the same .java file). While this is not illegal from a compilation standpoint, it was causing issues in my Maven clean install. I'm still not %100 sure why maven does not like this, but this fashion of static importing doesn't really make sense to begin with. To fix this, I removed the static import and substituded a normal static call (MyAnnoation.someObject) wherever the static import was being used.
我很抱歉，因为我没有为任何人包含足够的代码来确定问题的根本原因，通常我不会在我的帖子中包含 import 语句，但这次我应该有。下面的课程是一个更完整的例子。正如我们所见，下面的类声明了对驻留在静态嵌套类中的对象的静态导入（在同一个 .java 文件中）。虽然从编译的角度来看这并不违法，但它在我的 Maven 全新安装中引起了问题。我仍然不确定 %100 为什么 maven 不喜欢这个，但是这种静态导入的方式一开始就没有意义。为了解决这个问题，我删除了静态导入，并在使用静态导入的地方替换了一个普通的静态调用 (MyAnnoation.someObject)。
package com.classes;
import static com.classes.MyClass.MyAnnotation.someObject;
public class MyClass{
@MyAnnotation
public static class MyAnnotation{
public static final Object someObject = new Object();
}
Again, my apologies for not providing the static import details in my original post, hopefully someone finds this helpful.
再次，我很抱歉没有在我的原始帖子中提供静态导入详细信息，希望有人觉得这有帮助。
回答by Vinay Lodha
Did your maven-compiler-pluginis using 1.5. By default it used 1.4 and annotations are introduced in 1.5
你用的maven-compiler-plugin是 1.5. 默认情况下，它使用 1.4 并在 1.5 中引入注释
回答by carlspring
Try the following:
请尝试以下操作：
Import just one of the classes.
Always use the FQN (fully-qualified name) for the other case, let's assume that's the annotation (
@com.foo.MyAnnotation).Also, as Vinay suggested, set the
sourceandtargetversions in yourmaven-compiler-plugin's<configuration/>.
只导入其中一个类。
对于另一种情况，始终使用 FQN（完全限定名称），让我们假设这是注释 (
@com.foo.MyAnnotation)。此外，作为维奈建议，设置
source和target版本在你maven-compiler-plugin的<configuration/>。
