我目前是Glassfish应用服务器的新手,我一直在线使用管理界面在服务器上设置JDBC连接池。
我可以看到创建的连接池与服务器上默认创建的两个连接池一起列出,如下面的屏幕截图所示
我将此设置固定以确保一切正常,但是当我尝试从下面的代码清单中获取与数据库的连接时
public static Connection getDatabaseConnection()
{
Connection con = null;
try {
Context initialContext = new InitialContext();
if ( initialContext == null){
System.out.println("JNDI problem. Cannot get InitialContext.");
}
DataSource datasource = (DataSource)initialContext.lookup("AppDb");
if (datasource != null) {
con = datasource.getConnection();
}
else {
System.out.println("Failed to lookup datasource.");
}
}
catch(Exception ex)
{
System.out.println("error looking up connection");
ex.printStackTrace();
}
return con;
}
但我在下面得到以下错误,说明找不到连接
javax.naming.NamingException: Lookup failed for 'AppDb' in SerialContext[myEnv={java.naming.factory.initial=com.sun.enterprise.naming.impl.SerialInitContextFactory, java.naming.factory.state=com.sun.corba.ee.impl.presentation.rmi.JNDIStateFactoryImpl, java.naming.factory.url.pkgs=com.sun.enterprise.naming} [Root exception is javax.naming.NameNotFoundException: AppDb not found]
at com.sun.enterprise.naming.impl.SerialContext.lookup(SerialContext.java:491)
at com.sun.enterprise.naming.impl.SerialContext.lookup(SerialContext.java:438)
at javax.naming.InitialContext.lookup(InitialContext.java:417)
at javax.naming.InitialContext.lookup(InitialContext.java:417)
at com.keystone.test.User.getDatabaseConnection(User.java:156)
创建JDBC连接池是不够的,您应该:
1)在“JDBC资源”部分中,创建使用池的资源
2)为该资源提供JNDI名称
3)在代码中查找该名称
(参见Payara/GlassFish DataSource JNDI Lookup Reference和JDBC Connection Pool for GlassFish and Payara Java Application Servers)