JNDI没有从SQLServer中找到DataSource

时间:2014-03-26 13:52:41

标签: java sql-server xml jndi connection-pooling

我有一个名为“conpool”的MS SQLServer 2008数据库。并在那里创建了一个id,fullName和age的表。 现在我已经在Netbeans 7.3和Tomcat 7.0.30中使用Java实现了一个连接池,每次与数据库建立连接时都不会绑定,我可以为我的数据库创建查询。

我的连接池:

// ------------------------ Beginn JDBC Connection Pool ----------------- -----------------

 public static void main(String[] args) throws SQLException, NamingException {
    // Get DataSource

    Context initialContext = new InitialContext();
    System.out.println("Test1: a object from InitialContext has been created");

    Context context = (Context) initialContext.lookup("java:/comp/env");
    System.out.println("Test2: Context lookup was OKAY");

    //The JDBC Data source that was created in SQLServer
    DataSource datasource = (DataSource) context.lookup("jdbc/conpool");
    System.out.println("Test3: DataSource lookup with JNDI was successfully");
    System.out.println("JDBC Connecction Pool is created successfully");

    //-------------------------Ende JDBC Connection Pool--------------------------------------

    //Using a connection from the pool
    Connection connection = datasource.getConnection();
    System.out.println("Test4: Datasource Connection was successfully");

    if (connection == null) {
        throw new SQLException("Error establishing connection!");
        //System.out.println("DBConnection Failed!!! ");
    }

    //Using the connection to access the database

    //--------------------------------Beginn der Queryprocess------------------------------------------

    String query = "SELECT * FROM conpool.dbo.Personen";
    PreparedStatement statement = connection.prepareStatement(query);
    ResultSet rs = statement.executeQuery();

    System.out.println("Test5: All Object for a single Query are created");
    while (rs.next()) {
        System.out.println(rs.getString(query));
    }
    //Connection will be closed
    connection.close();

    //-------------------------------Ende der Queryprocess--------------------------------------

   }

我的web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app 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   http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
     version="2.4">
<description>Tomcat-ConnectionPooling with MS SQLServer</description>
<resource-ref>
    <description>DB Connection</description>
    <res-ref-name>jdbc/conpool</res-ref-name>
    <res-type>javax.sql.DataSource</res-type>
    <res-auth>Container</res-auth>
</resource-ref>
</web-app>

我的context.xml

<?xml version="1.0" encoding="UTF-8"?>
<Context  antiJARLocking="true" path="/ITWService">

<!-- Specify a JDBC datasource -->
<Resource name="jdbc/conpool" auth="Container" type="javax.sql.DataSource"

          maxActive="100" maxIdle="30" maxWait="10000"

          username="dbo" password="" driverClassName="com.microsoft.sqlserver.jdbc.SQLServerDriver"

          url="jdbc:sqlserver://localhost:1433;DatabaseName=conpool"/>
</Context>

现在我遇到了这种错误:

运行:

线程“main”中的异常javax.naming.NoInitialContextException:需要在环境或系统属性中指定类名,或者在applet参数中或在应用程序资源文件中指定类名:java.naming.factory.initial     在javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:645)     在javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:288)     在javax.naming.InitialContext.getURLOrDefaultInitCtx(InitialContext.java:325)     在javax.naming.InitialContext.lookup(InitialContext.java:392)     在com.akapoor.itwservice.server.RestServer.main(RestServer.java:136) Java结果:1 建立成功(总时间:1秒)

请帮助我解决我的问题。我非常感谢你,我很困惑。我尝试了一切,但没有帮助..请告诉我,我的问题在哪里,为什么我没有连接到我的数据库

1 个答案:

答案 0 :(得分:0)

您需要在托管环境(如应用程序服务器)中创建一个不带参数的InitialContext。

由于您发布的代码有一个主要方法,我假设您已将代码作为独立应用程序执行。但是在你的问题中你写的是你的应用程序在Tomcat上运行,所以你需要将它部署到你的容器并在那里调用它。

或者您是否有理由想远程访问JNDI?