Derby 远程连接超时：如何配置 Derby 网络服务器的网络设置？

Question

我尝试构建一个支持网络/客户端数据库连接的程序。我已经完成了用户与数据库联系的数据库创建和 GUI 设计方面的所有工作。在本地机器上一切正常（我的意思是 DB 创建和启动/停止 Derby Server 的 PC）

服务器配置；

//I take the exact path of derby jar files (derbyrun, derbynet, derby client etc.)
File file = new File(FirstTimeMainFrame.class.getProtectionDomain()
                .getCodeSource()
                .getLocation()
                .getPath().replace(new File(FirstTimeMainFrame.class.getProtectionDomain().getCodeSource().getLocation().getPath()).getName(), "").replace("%20", " "));
String path = file+"\\DB";

//Execute CMD Command for derbyrun.jar set the DERBY INSTALL Classpath
ProcessBuilder builder = new ProcessBuilder();
Process process = null;
String[] commandStart = new String[3];
String[] commandStop = new String[3];

commandStart[0] = "cmd.exe";
commandStart[1] = "/c";
commandStart[2] = "cd "+path+" && java -jar derbyrun.jar server start";

builder = new ProcessBuilder(commandStart[0], commandStart[1], commandStart[2]);
builder.redirectErrorStream(true);
process = builder.start();

//Create the DB with using Derby Client Driver
String driver = "org.apache.derby.jdbc.ClientDriver";
String connectionURL = "jdbc:derby://localhost:1527//myDB"+";create=true";
Class.forName(driver).newInstance();
Connection conn = DriverManager.getConnection(connectionURL);

//Connect to DB and Setting the DB Properties
connectionURL = "jdbc:derby://localhost:1527//myDB"+";create=false";
conn = DriverManager.getConnection(connectionURL);
//Turning on authentication, Create sample users, Create sample tables etc...

//Shutdown the Derby Server
commandStop[0] = "cmd.exe";
commandStop[1] = "/c";
commandStop[2] = "cd "+path+" && java -jar derbyrun.jar server shutdown";

builder = new ProcessBuilder(commandStop[0], commandStop[1], commandStop[2]);
builder.redirectErrorStream(true);
process = builder.start();

本地连接正常；

//Start the Server First
builder = new ProcessBuilder(commandStart[0], commandStart[1], commandStart[2]);
builder.redirectErrorStream(true);
process = builder.start();

//Load the driver and connect to Local DB
Class.forName("org.apache.derby.jdbc.ClientDriver").newInstance();
String connectionUrl = "jdbc:derby://localhost:1527//myDB"+";create=false;" + "user=" +"\""+ unameTextField.getText() +"\""+ ";" + "password=" +"\""+ new String (passwordPasswordField.getPassword()) +"\""+ ";"; 
Connection con = DriverManager.getConnection(connectionUrl);

Proplematic 远程连接；

Class.forName("org.apache.derby.jdbc.ClientDriver").newInstance();
String connectionUrl = "jdbc:derby://10.90.232.2:1527//myDB"+";create=false;" + "user=" +"\""+ unameTextField.getText() +"\""+ ";" + "password=" +"\""+ new String (passwordPasswordField.getPassword()) +"\""+ ";"; 
Connection con = DriverManager.getConnection(connectionUrl);

--PC1（服务器一）创建和存储数据库文件。它还具有在程序启动时启动和停止 Derby Network Server 的能力。当 PC1 运行程序时，我在 derby.log 中看到以下行，并了解服务器已成功启动并运行；

Sat Dec 26 04:06:49 EET 2015 : Apache Derby Network Server - 10.12.1.1 - (1704137) started and ready to accept connections on port 1527
Sat Dec 26 04:06:49 EET 2015: Booting Derby version The Apache Software Foundation - Apache Derby - 10.12.1.1 - (1704137): instance a816c00e-0151-dc09-cf3e-ffffaab85dad on database directory C:\Users\Server_PC\Desktop\Trying Project\DB\myDB with class loader sun.misc.Launcher$AppClassLoader@1909752 Loaded from file:/C:/Users/Server_PC/Desktop/Trying%20Project/DB/derby.jar
java.vendor=Oracle Corporation
java.runtime.version=1.8.0_66-b18
user.dir=C:\Users\Server_PC\Desktop\Trying Project\DB
os.name=Windows 7
os.arch=x86
os.version=6.1
derby.system.home=C:\Users\Server_PC\Desktop\Trying Project\DB
Database Class Loader started - derby.database.classpath=''

--PC2(Client one) 尝试使用其 LAN ip 连接到远程服务器。

我已将一些日志写入程序附加到程序中，当我在客户端机器上运行程序时，我看到下面的异常；

java.sql.SQLNonTransientConnectionException: java.net.ConnectException : Error connecting to server 10.90.232.2 on port 1.527 with message Connection timed out: connect.

我真的被困在这一点上。我错过了什么吗？

Answer 1

这可能是 Windows 防火墙，它通常默认打开，它将阻止从另一台机器到 Derby 网络服务器的入站连接，除非您明确配置 Windows 防火墙以允许此类连接。

原海报澄清说：

I forgot to say, sorry: I have already added Firewall Port rule 
for 1527 to Inbound and Outbound in PC1. Interesting thing is
when I check netroutes with netstat -an | find "1527" in PC1 I
see 127.0.0.1 1527 is in LISTENING state.

It should be 10.90.232.2 1527 ?

您可以使用 -h 和 -p 参数来影响 Derby Network Server 的侦听地址和端口，从而符合这些防火墙 你想说的规则：

-h 10.90.232.2 -p 1527

原发帖人确认以这种方式指定网络配置允许防火墙接受连接：

Exactly right. I found solution about 6-7 hours ago. 
For server Start should be 

commandStart[2] = "cd "+path+" && java -jar derbyrun.jar server start -h 10.90.232.2"; 

and shutdown 

commandStop[2] = "cd "+path+" && java -jar derbyrun.jar server shutdown -h 10.90.232.2"; 

then server and client side connect with 

String connectionUrl = "jdbc:derby://10.90.232.2:1527/myDB"+
    ";create=false;" + "user=" +"\""+ unameTextField.getText() +
    "\""+ ";" + "password=" +"\""+ 
    new String (passwordPasswordField.getPassword()) +"\""+ ";";