I have two AWS Instance I1 and I2 having Ip addresses as ip1 and ip2 respectively.What I want to achieve is:
I want to hit a url from I1(using java httpclient) and want that request should go through I2 instance i.e to outside world it should appear that the request is coming from instance I2.
For Example :
I am executing the below-mentioned code from instance I1 :
class Test {
public static void main(String[] args) {
String url = "https://api.ipify.org?format=json",
proxy = "ip2";
Proxy p = new Proxy(Proxy.Type.HTTP, new InetSocketAddress(proxy, 80));
URL server = new URL(url);
Properties systemProperties = System.getProperties();
HttpURLConnection connection = (HttpURLConnection)server.openConnection(p);
connection.connect();
String theString = IOUtils.toString(connection.getInputStream(), StandardCharsets.UTF_8);
System.out.println(theString);
}
}
The Output should be public Ip of instance I2. But it is throwing the exception:
Exception in thread "main" java.net.ConnectException: Connection refused (Connection refused)
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.Socket.connect(Socket.java:589)
at java.net.Socket.connect(Socket.java:538)
at sun.net.NetworkClient.doConnect(NetworkClient.java:180)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
at sun.net.www.http.HttpClient$1.run(HttpClient.java:515)
at sun.net.www.http.HttpClient$1.run(HttpClient.java:513)
at java.security.AccessController.doPrivileged(Native Method)
at sun.net.www.http.HttpClient.privilegedOpenServer(HttpClient.java:512)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:553)
at sun.net.www.protocol.https.HttpsClient.<init>(HttpsClient.java:264)
at sun.net.www.protocol.https.HttpsClient.New(HttpsClient.java:367)
at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(AbstractDelegateHttpsURLConnection.java:191)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1199)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:177)
at sun.net.www.protocol.https.HttpsURLConnectionImpl.connect(HttpsURLConnectionImpl.java:162)
at sun.net.www.protocol.https.HttpsURLConnectionImpl$connect.call(Unknown Source)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:113)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:117)
at com.exp.Test.main(Test.java:24)
I have googled for the above mentioned use case but was not able to find anything. Any help is appriciated.
This issue is fixed.
Installed squid server on instance I2.
Related
When i'm trying to connect to tarantool server i get the following error:
Exception in thread "main" java.net.ConnectException: Connection
refused: connect at java.net.DualStackPlainSocketImpl.connect0(Native
Method) at
java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)
at
java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at
java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at
java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172) at
java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) at
java.net.Socket.connect(Socket.java:589) at
java.net.Socket.connect(Socket.java:538) at
java.net.Socket.(Socket.java:434) at
java.net.Socket.(Socket.java:211) at
TarantoolKt.main(Tarantool.kt:37)
My code:
class Tarantool {
val client: TarantoolClient
init {
val config: TarantoolClientConfig = TarantoolClientConfig()
config.apply {
username = "test"
password = "test"
}
val socketChannelProvider: SocketChannelProvider = SocketChannelProvider { _, p1 ->
when(p1) {
null -> {
println("Trying to connect . . .")
SocketChannel.open(InetSocketAddress("192.168.1.254", 3301)) // <- error
}
else -> {
p1.printStackTrace(System.out)
null!!
}
}
}
client = TarantoolClientImpl(socketChannelProvider, config)
}
}
fun main(args: Array<String>): Unit {
val client: Tarantool = Tarantool()
println(client.client.isAlive)
}
I get the same error when i'm trying to use different ip
It's the same as in tutorial here: https://github.com/tarantool/tarantool-java/
I'd also created the test user using this commands:
box.schema.user.create('test', { password = 'test' })
box.schema.user.grant('test', 'execute,read,write', 'universe')
I use docker for tarantool and i tried to ping IPs from windows 7 cmd and it works.
Thank you!
SOLVED
I have a problem with sending emails in Java. I am using the JavaMail api to send emails. I have a program which downloads an email attachment using pop3, reads the content, does some manipulation and then sends the result in an email using smtp.
The program works fine until the last step where it sends the email and I get the following exception.
javax.mail.MessagingException: Could not connect to SMTP host: localhost, port: 25;
nested exception is:
java.net.ConnectException: Connection refused: connect
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1961)
at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:654)
at javax.mail.Service.connect(Service.java:295)
at javax.mail.Service.connect(Service.java:176)
at javax.mail.Service.connect(Service.java:125)
at javax.mail.Transport.send0(Transport.java:194)
at javax.mail.Transport.send(Transport.java:124)
at com.adidas.monitoring.SendMail.sendMail(SendMail.java:46)
at com.adidas.monitoring.MainClass.main(MainClass.java:115)
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(Unknown Source)
at java.net.PlainSocketImpl.connectToAddress(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:321)
at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:237)
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1927)
I am using the following code to send the email
public void sendMail(String strMailContent)
{
MimeMessage emailMessage;
Properties emailProperties = new Properties();
try {
emailProperties.load(new FileInputStream("Email.ini"));
} catch (IOException e){
DataLogger.logger.error(e.getMessage());
}
/*Get the properties from the email configuration file*/
String From = emailProperties.getProperty("Email.From");
String ToAdd = emailProperties.getProperty("Email.To");
String CC = emailProperties.getProperty("Email.CC");
String Subject = emailProperties.getProperty("Email.Subject");
String Host = emailProperties.getProperty("Email.Gateway");
emailProperties.setProperty("mail.smtp.host", Host);
Session emailSendSession = Session.getDefaultInstance(emailProperties);
try{
emailMessage = new MimeMessage(emailSendSession);
emailMessage.setFrom(new InternetAddress(From));
emailMessage.addRecipients(javax.mail.Message.RecipientType.TO,ToAdd);
emailMessage.addRecipients(javax.mail.Message.RecipientType.CC,CC);
emailMessage.setSubject(Subject);
emailMessage.setText(strMailContent);
Transport.send(emailMessage);
}
catch (Exception mailEx)
{
mailEx.printStackTrace();
}
}
The above code works fine when I use it with other programs. But when I am using it along with the pop3 code in this case, I have this error. Strange thing is the host is shown as localhost even though I set the property "mail.smtp.host".
Any help on this topic is really appreciated.
I dont know much about the connection proccess i'm trying to connect wordpress database without creating new database with my remotedesktop IP in mysql. Normally i can connect localhost and i can connect to database that created with remote ip. In my server mydatabase host name/Ip adress is localhost, as i said i dont know the whole connection between url request,wp-config file and mysql. I think i'm sending request with url to wp-config and it is connecting to my localhost. Anyway i want to connect to my remotedesktop's localhost with JAVA but i couldn't. Let me explain with code . Hope i could explain myself.
Thanks in advance.
Here are the codes :
wp-config.php
define('DB_NAME', 'mydbname');
define('DB_USER', 'mydbuser');
define('DB_PASSWORD', 'mydbpass');
define('DB_HOST', '127.0.0.1');
My connection code :
public class Dt_page {
public static DataSource getDataSource(int server) {
String database_driver = null;
String database_adres = null;
String dbuser = null;
String dbpass = null;
ConnectionFactory connectionFactory;
switch (server) {
case 1://profile server
database_driver = "com.mysql.jdbc.Driver";
database_adres = "jdbc:mysql://MY_REMOTE_DESKTOP_IP:3306/?useUnicode=true&characterEncoding=UTF-8&rewriteBatchedStatements=true";
dbuser = "mydbuser";
dbpass = "mydbpass";
}
try {
Class.forName(database_driver);
} catch (ClassNotFoundException ex) {
Logger.getLogger(Dt_page.class.getName()).log(Level.SEVERE, null, ex);
}
Properties props = new Properties();
props.put("user", dbuser);
props.put("password", dbpass);
props.put("autoReconnect", "true");
props.put("autoReconnectForPools", "true");
props.put("validationQuery", "SELECT 1 from dual;");
props.put("testWhileIdle","true");
connectionFactory = new DriverManagerConnectionFactory(database_adres, props);
GenericObjectPool connectionPool = new GenericObjectPool(null, 12, GenericObjectPool.WHEN_EXHAUSTED_GROW, 60*30, 12,true,true);
GenericKeyedObjectPoolFactory keyedObjectPoolFactory = new GenericKeyedObjectPoolFactory(null);
PoolableConnectionFactory poolableConnectionFactory =
new PoolableConnectionFactory(connectionFactory,
connectionPool,
keyedObjectPoolFactory,
"select 1",
30,
null,
false,
true);
PoolingDataSource dataSource = new PoolingDataSource(connectionPool);
return dataSource;
And SQL
QueryRunner qr;
qr = new QueryRunner(Dt_page.getDataSource(1));
try {
List<Object[]> v = qr.query("Select meta_value from mydbname.wp_favorite", new ArrayListHandler());
System.out.println(v.size());
for (Object[] objects : v) {
for (Object object : objects) {
System.out.println(object);
}
}
}
catch (Exception ex){
ex.printStackTrace();
}
}
}
Error Log:
com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server. Attempted reconnect 3 times. Giving up.
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.Util.getInstance(Util.java:386)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1014)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:988)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:974)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:919)
at com.mysql.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:2367)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2288)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:822)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:404)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:317)
at java.sql.DriverManager.getConnection(DriverManager.java:571)
at java.sql.DriverManager.getConnection(DriverManager.java:187)
at org.apache.commons.dbcp.DriverManagerConnectionFactory.createConnection(DriverManagerConnectionFactory.java:78)
at org.apache.commons.dbcp.PoolableConnectionFactory.makeObject(PoolableConnectionFactory.java:582)
at org.apache.commons.pool.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:1188)
at org.apache.commons.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:106)
at org.apache.commons.dbutils.AbstractQueryRunner.prepareConnection(AbstractQueryRunner.java:175)
at org.apache.commons.dbutils.QueryRunner.query(QueryRunner.java:304)
at tazedizi.TazeDizi.main(TazeDizi.java:29)
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1117)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:355)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2461)
at com.mysql.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:2306)
... 19 more
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.DualStackPlainSocketImpl.connect0(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:579)
at java.net.Socket.connect(Socket.java:528)
at java.net.Socket.<init>(Socket.java:425)
at java.net.Socket.<init>(Socket.java:241)
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:259)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:305)
... 21 more
Two things to check:
Are you sure that your mysql server is configurated to listend on MY_REMOTE_DESKTOP_IP ?
Are you sure that your firewall (iptable...) allows connexion on MY_REMOTE_DESKTOP_IP on tpc port 3306 ?
I want the request of http get request using the following java code.
But, uncertainly i am getting the following exception.
import java.net.*;
import java.io.*;
public class API {
public static void main(String[] args) throws Exception {
URL oracle = new URL("http://www.oracle.com/");
URLConnection yc = oracle.openConnection();
BufferedReader in = new BufferedReader(new InputStreamReader(yc.getInputStream()));
String inputLine;
while ((inputLine = in.readLine()) != null)
System.out.println(inputLine);
in.close();
}
}
The Error or exception is as follows:
Exception in thread "main" java.net.ConnectException: Connection timed out: connect
at java.net.DualStackPlainSocketImpl.connect0(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:69)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:337)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:198)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:180)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:157)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:391)
at java.net.Socket.connect(Socket.java:579)
at java.net.Socket.connect(Socket.java:528)
at sun.net.NetworkClient.doConnect(NetworkClient.java:180)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:388)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:483)
at sun.net.www.http.HttpClient.<init>(HttpClient.java:213)
at sun.net.www.http.HttpClient.New(HttpClient.java:300)
at sun.net.www.http.HttpClient.New(HttpClient.java:316)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:992)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:928)
at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:846)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1296)
at API.main(API.java:8)
I'm guessing you have a firewall and it's blocking this HTTP get request.
You code should work as you expect it. Something outside the Java runtime is preventing the connection.
Check whether you can ping to http://www.oracle.com/.
If you can ping check whether you are behind a proxy server.
If so provide -Dhttp.proxyHost and -Dhttp.proxyPort while starting the JVM
java -Dhttp.proxyHost=<Your Proxy Server Name/IP> -Dhttp.proxyPort=<Your Proxy Server Port>
I am trying to fetch and download file in html format. Following is the code block:
import java.net.*;
import java.io.*;
public class URLReader {
public static void main(String[] args) throws Exception {
System.setProperty("http.proxyHost", "webcache.mydomain.com");
System.setProperty("http.proxyPort", "8080");
URL url = new URL("http://www.java2s.com/");
BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream()));
String inputLine;
while ((inputLine = in.readLine()) != null)
System.out.println(inputLine);
in.close();
}
}
Here, when i am trying to Run this java file it show me following error:
D:\Build>javac URLReader.java
D:\Build>java URLReader
Exception in thread "main" java.net.ConnectException: Connection timed out: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:351)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:213)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:200)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
at java.net.Socket.connect(Socket.java:529)
at java.net.Socket.connect(Socket.java:478)
at sun.net.NetworkClient.doConnect(NetworkClient.java:163)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:388)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:523)
at sun.net.www.http.HttpClient.<init>(HttpClient.java:227)
at sun.net.www.http.HttpClient.New(HttpClient.java:300)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:977)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:925)
at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:836)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1172)
at java.net.URL.openStream(URL.java:1010)
at URLReader.main(URLReader.java:12)
I don't think there any problem with code because When i tried to run this code at Home it worked for me. But when i tried it in my office it showed me the error!
So i guess there must be some kind of blockage in my office.
Can i set any proxy here in code so that it might work?
If you are behind a proxy you need to configure Java to use it. Read here on how to set your proxy for your network program
Try this as mentioned in this link http://docs.oracle.com/javase/6/docs/technotes/guides/net/proxies.html
//Set the http proxy to webcache.mydomain.com:8080
System.setProperty("http.proxyHost", "webcache.mydomain.com");
System.setPropery("http.proxyPort", "8080");
// Next connection will be through proxy.
URL url = new URL("http://java.sun.com/");
InputStream in = url.openStream();
// Now, let's 'unset' the proxy.
System.setProperty("http.proxyHost", null);
// From now on http connections will be done directly.