JNDI @资源注释 [英] JNDI @Resource annotation

问题描述

在servlet和过滤器类中，我可以通过注释初始化DataSource变量

In servlet and filter classes i can initialize DataSource variable via annotation

 @Resource(name = "jdbc/testDB")
    protected DataSource ds;

但是它如何通过注解在基本类中初始化? 通常会抛出 NullPointerException

But how it initialize in basic class via annotation? Usually thorows NullPointerException

public class AddAuto {
        @Resource(name = "jdbc/testDB")
        private DataSource ds;
}

推荐答案

您的容器是什么?

如果是tomcat，则资源名称应该是这样的

If it's tomcat, the resource name should be something like this

@Resource(name = "java:/comp/env/jdbc/testDB")
    protected DataSource ds;

我不知道其他容器，但是JBoss与Tomcat相同，而GlassFish作为您的值.

I don't know about the other container, but JBoss would be same as Tomcat, and GlassFish as your value.

我还建议您使用旧的查找方法，从而对调试有很大帮助

Also I suggest old lookup which help you so much for debugging

void init(){
DataSource ds=(DataSource)InitialContext.doLookup("java:/comp/env/jdbc/testDB");
}

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