java 当对 CDI 中的事件使用自定义注释时，此位置不允许使用注释“@Added”
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原文地址: http://stackoverflow.com/questions/28231004/
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The annotation "@Added" is disallowed for this location, when using custom annotation with events in CDI
提问by Gica
When using a custom qualifier near the @Observes qualifier to catch an event I have this compilation error.
在@Observes 限定符附近使用自定义限定符来捕获事件时，我遇到了此编译错误。
All the classes are in the same package so the problem is not the import statements. I already checked that.
所有的类都在同一个包中，所以问题不在于导入语句。我已经检查过了。
@Inject
private Logger logger;
List<Book> inventory = new ArrayList<>();
public void addBook(@Observes @Added Book book) {
logger.warning("adding book" + book.getTitle());
inventory.add(book);
}
public void removeBook(@Observes @Removed Book book) {
logger.warning("remove book");
}
So, this line: public void addBook(@Observes @Added Book book) {
所以，这一行： public void addBook(@Observes @Added Book book) {
and this like: public void removeBook(@Observes @Removed Book book) {
就像这样： public void removeBook(@Observes @Removed Book book) {
are marked with the following error: The annotation @Added (@Removed) is not allowed for this location.
标有以下错误：此位置不允许使用注释@Added (@Removed)。
And here is the code that defines the methods addBook and removeBook. Here there's no problem.
这是定义 addBook 和 removeBook 方法的代码。这里没有问题。
@Inject
@Added
private Event<Book> bookAddedEvent;
@Inject
@Removed
private Event<Book> bookRemovedEvent;
public Book createBook(String title, float price, String description) {
Book book = new Book(title, price, description);
book.setNumber(numberGenerator.generateNumber());
bookAddedEvent.fire(book);
return book;
}
public void deleteBook(Book book) {
bookRemovedEvent.fire(book);
}
回答by Harald Wellmann
What's the definition of your qualifier annotations @Addedand @Removed?
什么是你的预选赛注释的定义@Added和@Removed？
You're probably missing the PARAMETERentry in the @Targetlist:
您可能遗漏PARAMETER了@Target列表中的条目：
@Target({ TYPE, METHOD, PARAMETER, FIELD })
