java.lang.NoClassDefFoundError:com/google/cloud/sql/core/CoreSocketFactory [英] java.lang.NoClassDefFoundError: com/google/cloud/sql/core/CoreSocketFactory

问题描述

当我尝试运行通过jdbc连接到Google云实例的脚本时，我一直收到此错误.完全不确定该如何解决:

I keep getting this error when I try to run a script that connects to a google cloud instance via jdbc. Not really sure at all how to fix it:

Exception in thread "main" java.lang.NoClassDefFoundError: com/google/cloud/sql/core/CoreSocketFactory
        at com.google.cloud.sql.postgres.SocketFactory.createSocket(SocketFactory.java:73)
        at org.postgresql.core.PGStream.<init>(PGStream.java:73)
        at org.postgresql.core.v3.ConnectionFactoryImpl.tryConnect(ConnectionFactoryImpl.java:93)
        at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:197)
        at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:49)
        at org.postgresql.jdbc.PgConnection.<init>(PgConnection.java:211)
        at org.postgresql.Driver.makeConnection(Driver.java:459)
        at org.postgresql.Driver.connect(Driver.java:261)
        at java.sql.DriverManager.getConnection(DriverManager.java:664)
        at java.sql.DriverManager.getConnection(DriverManager.java:270)
        at App.main(App.java:12)
Caused by: java.lang.ClassNotFoundException: com.google.cloud.sql.core.CoreSocketFactory
        at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:355)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
        ... 11 more

正在连接到db的脚本(".."引用出于隐私原因未包含的实例名称和密码):

Script that's connecting to db (".." references instance name and password that haven't been included for privacy reasons):

import java.sql.Connection;
import java.sql.DriverManager;

public class App
{
    public static void main(String args[])
    {
        Connection c = null;
        try
        {
           Class.forName("org.postgresql.Driver");
           c = DriverManager.getConnection("jdbc:postgresql:///<postgres>?cloudSqlInstance=<...:database>&socketFactory=com.google.cloud.sql.postgres.SocketFactory&user=<postgres>&password=<...>");
        }
        catch (Exception e)
        {
           e.printStackTrace();
           System.err.println(e.getClass().getName()+": "+e.getMessage());
           System.exit(0);
        }
        System.out.println("Opened database successfully");
     }
}

推荐答案

您正在尝试将socketFactory=com.google.cloud.sql.postgres.SocketFactory参数传递给JDBC连接字符串，而在类路径中找不到类com.google.cloud.sql.core.CoreSocketFactory.

You're trying to pass socketFactory=com.google.cloud.sql.postgres.SocketFactory parameter to JDBC connection string, while class com.google.cloud.sql.core.CoreSocketFactory is not found in your classpath.

您似乎尚未将必需的依赖项添加到classpath.看看GCP github手册: https://github.com/GoogleCloudPlatform/cloud-sql-jdbc-socket-factory

It looks you have not added a required dependency to classpath. Take a look at GCP github manual: https://github.com/GoogleCloudPlatform/cloud-sql-jdbc-socket-factory

例如，如果您使用的是Maven，请添加此依赖项

For example, add this dependency if you're using Maven

<dependency>
    <groupId>com.google.cloud.sql</groupId>
    <artifactId>postgres-socket-factory</artifactId>
    <version>1.0.15</version>
</dependency>

这篇关于java.lang.NoClassDefFoundError:com/google/cloud/sql/core/CoreSocketFactory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IT屋！