Spring boot 应用程序错误日志显示尝试在 FanManager 中配置 ONS 失败，并出现 oracle.ons.NoServersAvailabl

在开发和部署Spring Boot应用程序时，我们经常会遇到各种错误和异常。其中一个常见的问题是在配置FanManager时尝试使用ONS(Oracle Notification Service)失败，并出现oracle.ons.NoServersAvailable错误。这个错误通常表示应用程序无法连接到ONS服务器。

java
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import oracle.jdbc.pool.OracleDataSource;
import oracle.ucp.jdbc.PoolDataSource;
import oracle.ucp.jdbc.PoolDataSourceFactory;
@SpringBootApplication
@EnableTransactionManagement
public class SpringBootApp {
    public static void main(String[] args) {
        SpringApplication.run(SpringBootApp.class, args);
    }
    @Bean
    public PoolDataSource dataSource() throws Exception {
        OracleDataSource oracleDataSource = new OracleDataSource();
        oracleDataSource.setURL("jdbc:oracle:thin:@localhost:1521:xe");
        oracleDataSource.setUser("username");
        oracleDataSource.setPassword("password");
        PoolDataSource poolDataSource = PoolDataSourceFactory.getPoolDataSource();
        poolDataSource.setDataSource(oracleDataSource);
        poolDataSource.setConnectionPoolName("MyConnectionPool");
        return poolDataSource;
    }
}