上下文是只读的

问题描述

Helo管理员，我必须动态创建JNDI数据源，我尝试使用一个名为SetupApplicationListener的侦听器来做到这一点.这是WEB-LIB/web.xml

Helo masters, I have to create a JNDI Datasource dynamically, I tried to do it with a listener called SetupApplicationListener. Here is the beginning of WEB-LIB/web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee">

    <display-name>pri-web</display-name>

    <!-- Listeners -->
    <listener>
        <listener-class>org.apache.myfaces.webapp.StartupServletContextListener</listener-class>
    </listener>
    <listener>
        <listener-class>myapp.SetupApplicationListener</listener-class>
    </listener>

侦听器的代码:

public class SetupApplicationListener implements ServletContextListener {

    public static Log LOG = null;

    public void contextInitialized(ServletContextEvent ctx){
        try {
            createOracleDataSource();
.....
        }
    }

    private void createOracleDataSource() throws SQLException, NamingException {
        OracleDataSource ds = new OracleDataSource();
        ds.setDriverType(...);
        ds.setServerName(...);
        ds.setPortNumber(...);
        ds.setDatabaseName(...);
        ds.setUser(...);
        ds.setPassword(...);

        new InitialContext().bind("java:comp/env/jdbc/myDS", ds);
    }

.....
}

有错误:

[ERROR] 29/01/2013 09:44:50,517 (SetupApplicationListener.java:86) -> Error
javax.naming.NamingException: Context is read only
    at org.apache.naming.NamingContext.checkWritable(NamingContext.java:903)
    at org.apache.naming.NamingContext.bind(NamingContext.java:831)
    at org.apache.naming.NamingContext.bind(NamingContext.java:171)
    at org.apache.naming.NamingContext.bind(NamingContext.java:187)
    at org.apache.naming.SelectorContext.bind(SelectorContext.java:186)
    at javax.naming.InitialContext.bind(InitialContext.java:359)
    at myapp.SetupApplicationListener.createOracleDataSource(SetupApplicationListener.java:102)

我可以将上下文的只读属性设置为"true"吗?谢谢！ :)

Can I set the read-only properties of the Context to "true"? Thanks! :)

Tomcat 6.0
Oracle 11g
jdk1.5

编辑:不需要动态，我必须在内部定义jndi数据源，因为它是共享服务器，所以我不能修改服务器文件.一定是jndi，因为其他模块以这种方式使用它，谢谢.

EDIT: Don't need to be dynamically, i have to define a jndi datasource internally I can't modify the server files because it is a shared server. It must be jndi because other modules use it in that way, thanks.

推荐答案

如果您需要动态创建数据源，是否真的需要JNDI查找? JNDI旨在使连接位于应用程序外部，而在您的情况下，由于合法要求，它与应用程序紧密耦合.为什么不只使用JDBC连接呢?

If you need to create a datasource dynamically is there really any need for a JNDI lookup? JNDI is designed to make the connection external to the application, while in your scenario its tightly coupled to the application due to a legitimate requirement. Why not just use a JDBC connection?

这篇关于上下文是只读的的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！