I have deployed a microservice into AWS Elasticbeanstalk using tomacat server as the platform. My instance has gone to warning state now. When i call the rest GET method, i can see that my code is not able to make a connection to MYSQL which is also an instance in AWS.
Below is the error am facing
Last packet sent to the server was 0 ms ago. at
sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:406) at
com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1074)
at
com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2103)
at com.mysql.jdbc.ConnectionImpl.(ConnectionImpl.java:718)
...............
Caused by: java.net.ConnectException: Connection timed out (Connection
timed out) 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.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:244) at
com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:253)
at com.mysql.jdbc.MysqlIO.(MysqlIO.java:280) at
com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2026)
However the same code if i run locally on my laptop, i can connect to RDS which is on AWS and get the desired output.
I have alsoattached AmazonRDSFullaccess policy to the role that is generated against elasticbeanstalk instance. But issue still exists.
Need help in resolving this. Thanks in advance
Related
Can't connect to postgres from scala slick app, jdbc connection on VPS.
But I can connect
from local computer to VPS using dbeaver,
and I can connect using psql localhost from inside VPS,
and I can connect to VPS db launching app on my home computer.
So looks like everything working except app on VPS. Port is open, configs are same, Java version 1.8 on home computer and vps, connection string not empty and looks like
jdbc:postgresql://localhost:{custom port}/{db_name}
Error log:
DEBUG c.zaxxer.hikari.pool.HikariPool - database.whale - Cannot acquire connection from data source
org.postgresql.util.PSQLException: The connection attempt failed.
at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:292)
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:458)
at org.postgresql.Driver.connect(Driver.java:260)
at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:136)
at com.zaxxer.hikari.pool.PoolBase.newConnection(PoolBase.java:369)
at com.zaxxer.hikari.pool.PoolBase.newPoolEntry(PoolBase.java:198)
at com.zaxxer.hikari.pool.HikariPool.createPoolEntry(HikariPool.java:467)
at com.zaxxer.hikari.pool.HikariPool.access$100(HikariPool.java:71)
at com.zaxxer.hikari.pool.HikariPool$PoolEntryCreator.call(HikariPool.java:706)
at com.zaxxer.hikari.pool.HikariPool$PoolEntryCreator.call(HikariPool.java:692)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.net.SocketTimeoutException: connect timed out
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.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:607)
at org.postgresql.core.PGStream.<init>(PGStream.java:75)
at org.postgresql.core.v3.ConnectionFactoryImpl.tryConnect(ConnectionFactoryImpl.java:91)
at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:192)
Actually restart the VPS make all working.
I tried to restart firewalls(ufw, iptables etc), postgres, apps, another components, nothing happend. But restart full VPS save the day.
I think it was like a bug in OS, but don't know what kind of...
I have 2 Spring boot projects running on same tomcat:
REST-API
Background Service (BS)
Purpose
REST-API : UI application uses this to get things done.
BS : Based on UI activity this service gets executed and gets things done on Real-time .
Details
BS is written as while(1) considering the purpose of the same.
Tomcat Error
1st Attempt:
Using CATALINA_PID: /home/user/bin/pid/tomcat_pid
Tomcat did not stop in time.
PID file was not removed.
To aid diagnostics a thread dump has been written to standard out
2nd Attempt:
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.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.<init>(Socket.java:434)
at java.net.Socket.<init>(Socket.java:211)
at org.apache.catalina.startup.Catalina.stopServer(Catalina.java:492)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.catalina.startup.Bootstrap.stopServer(Bootstrap.java:406)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:495)
The stop command failed. Attempting to signal the process to stop through OS signal.
Tomcat stopped.
Problems:
1. When I restart tomcat, BS project will only be running and REST-API does not get started (I guess this happens because of while(1) it starts executing and not giving chance to start REST-API project )
2. While stopping tomcat it does not get stopped in a single attempt, when we try to stop one more time then it gets stopped.
This exception mostly indicates that there is no service listening on the IP/port you are trying to connect to, so ,you are trying to connect to the wrong IP/port, or the server is not started.
I have created an application, that communicates with a remote MySQL database, which is on my laptop. The app work fine, when I use my localhost to connect like this:
public class DbConncetion {
public Connection Connect(){
try {
Class.forName("com.mysql.jdbc.Driver");
Connection con= DriverManager.getConnection("jdbc:mysql://localhost:3306/cms?autoReconnect=true&useSSL=false","root","");
return con;
}
catch(Exception ex){
System.out.println(ex);
}
return null;
}
}
It works just great. But when I use my public IP addres instead of "localhost", the app throws:
com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server. Attempted reconnect 3 times. Giving up.
java.lang.NullPointerException
I look a lot in this forum, but I didn't find anything. I create user and give him all privileges in my XAMPP MySQL like that:
This is pic from there
I configure the router, but i'm not sure is it correct:
This is pic from there
Can anyone told me, where i go wrong ?
Thanks in advance :)
And this is the full stacktrace:
t
com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2088)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:806)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:410)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:328)
at java.sql.DriverManager.getConnection(DriverManager.java:664)
at java.sql.DriverManager.getConnection(DriverManager.java:247)
at DBconnection.DbConncetion.Connect(DbConncetion.java:24)
at javafxapplication1.Main1Controller.loadData(Main1Controller.java:208)
at javafxapplication1.Main1Controller.lambda$new$0(Main1Controller.java:232)
at com.sun.scenario.animation.shared.TimelineClipCore.visitKeyFrame(TimelineClipCore.java:239)
at com.sun.scenario.animation.shared.TimelineClipCore.playTo(TimelineClipCore.java:180)
at javafx.animation.Timeline.impl_playTo(Timeline.java:176)
at javafx.animation.AnimationAccessorImpl.playTo(AnimationAccessorImpl.java:39)
at com.sun.scenario.animation.shared.InfiniteClipEnvelope.timePulse(InfiniteClipEnvelope.java:110)
at javafx.animation.Animation.impl_timePulse(Animation.java:1102)
at javafx.animation.Animation$1.lambda$timePulse$25(Animation.java:186)
at java.security.AccessController.doPrivileged(Native Method)
at javafx.animation.Animation$1.timePulse(Animation.java:185)
at com.sun.scenario.animation.AbstractMasterTimer.timePulseImpl(AbstractMasterTimer.java:344)
at com.sun.scenario.animation.AbstractMasterTimer$MainLoop.run(AbstractMasterTimer.java:267)
at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:506)
at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:490)
at com.sun.javafx.tk.quantum.QuantumToolkit.lambda$runToolkit$404(QuantumToolkit.java:319)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
at java.lang.Thread.run(Thread.java:745)
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:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:989)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:341)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2251)
at com.mysql.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:2104)
... 33 more
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.TwoStacksPlainSocketImpl.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.PlainSocketImpl.connect(PlainSocketImpl.java:172)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:211)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:300)
... 35 more
Feb 18, 2017 2:23:03 PM DBconnection.DbConncetion Connect
SEVERE: null
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:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)
at com.mysql.jdbc.Util.getInstance(Util.java:408)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:918)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:897)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:886)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:860)
at com.mysql.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:2163)
You must allow the application ip address in Mysql user configuration, in your pic you have masked the ip allowed, that ip must be the application server ip.
If you run your web application from the same local network of the DB Host you cannot connect to the public IP of your DB Host, the router cannot simply do that.
So for your local test you must use localhost.
When you will deploy the app you must use the public.
By the way, it is not a good practice to expose mysql db port to internet.
I wrote a multi-server chat system based on Java under Windows. At the security part, I created one keystore to create the SSLSocket. When I launch 3 servers, it works on Windows(Win10 14393.321) but fails on OS X(Version 10.12 (16A323)) and Linux(Ubuntu 14.04.4 LTS). It really confused me. Here is the keystore part:
System.setProperty("javax.net.ssl.keyStore",keyFilepath);
System.setProperty("javax.net.ssl.trustStore",keyFilepath);
System.setProperty("javax.net.ssl.keyStorePassword","password");
System.setProperty("javax.net.ssl.trustStorePassword", "password");
And when I run the third server on OS X or Linux, it shows:
java.net.ConnectException: 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.SocksSocketImpl.connect(SocksSocketImpl.java:392) at
java.net.Socket.connect(Socket.java:589) at
sun.security.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:668) at
sun.security.ssl.SSLSocketImpl.(SSLSocketImpl.java:427) at
sun.security.ssl.SSLSocketFactoryImpl.createSocket(SSLSocketFactoryImpl.java:88)
at server.AuthorizeServer.MessageReceive(AuthorizeServer.java:99) at
server.AuthorizeServer.main(AuthorizeServer.java:64) at
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497) at
org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader.main(JarRsrcLoader.java:58)
This is my first time asking on StackOverflow and I really looking forward to your kind help.
Thanks!
java.net.ConnectException: Connection refused
Connection refused is an error message from the TCP stack and means that it could not connect with TCP to the other side. Since SSL/TLS is a layer on top of TCP and is only started once the TCP connect succeeded it means that the problem is not caused by different behavior at the SSL/TLS layer.
That this is not cause by the SSL layer but the TCP layer can also be seen by the stacktrace: Connection refused at java.net.PlainSocketImpl.socketConnect
More likely is that there is something blocking the TCP connection (firewall) or that you've tried to listen/connect to the wrong IP address (e.g. trying to reach a server listening on 127.0.0.1 on Windows from the Linux system). But is impossible to say from the currently provided information what exactly is the case.
I tried to start application on remote host and received the below exception
message java.net.ConnectException: Connection refused: connect
description The server encountered an internal error that prevented it from fulfilling this request.
exception
javax.servlet.ServletException: java.net.ConnectException: Connection refused: connect
com.vaadin.terminal.gwt.server.AbstractApplicationServlet.handleServiceException(AbstractApplicationServlet.java:1010)
com.vaadin.terminal.gwt.server.AbstractApplicationServlet.service(AbstractApplicationServlet.java:548)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
root cause
java.net.ConnectException: Connection refused: connect
java.net.DualStackPlainSocketImpl.connect0(Native Method)
java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)
java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
java.net.Socket.connect(Socket.java:579)
java.net.Socket.connect(Socket.java:528)
sun.net.NetworkClient.doConnect(NetworkClient.java:180)
sun.net.www.http.HttpClient.openServer(HttpClient.java:378)
sun.net.www.http.HttpClient.openServer(HttpClient.java:473)
sun.net.www.http.HttpClient.<init>(HttpClient.java:203)
sun.net.www.http.HttpClient.New(HttpClient.java:290)
sun.net.www.http.HttpClient.New(HttpClient.java:306)
sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:995)
sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:931)
sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:849)
sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1299)
com.sun.org.apache.xerces.internal.impl.XMLEntityManager.setupCurrentEntity(XMLEntityManager.java:633)
com.sun.org.apache.xerces.internal.impl.XMLVersionDetector.determineDocVersion(XMLVersionDetector.java:189)
com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:799)
com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:764)
com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:123)
com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1210)
com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:568)
com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl.parse(SAXParserImpl.java:302)
scala.xml.factory.XMLLoader$class.loadXML(XMLLoader.scala:40)
scala.xml.XML$.loadXML(XML.scala:40)
scala.xml.factory.XMLLoader$class.load(XMLLoader.scala:54)
scala.xml.XML$.load(XML.scala:40)
com.exo.AppUser.<init>(AppUser.scala:17)
com.exo.OdaWebApplication.<init>(OdaWebApplication.scala:24)
sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
java.lang.reflect.Constructor.newInstance(Constructor.java:526)
java.lang.Class.newInstance(Class.java:374)
com.vaadin.terminal.gwt.server.ApplicationServlet.getNewApplication(ApplicationServlet.java:82)
com.vaadin.terminal.gwt.server.AbstractApplicationServlet.createApplication(AbstractApplicationServlet.java:984)
com.vaadin.terminal.gwt.server.AbstractApplicationServlet.findApplicationInstance(AbstractApplicationServlet.java:807)
com.vaadin.terminal.gwt.server.AbstractApplicationServlet.service(AbstractApplicationServlet.java:456)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
i tried figuring out the reason and checked some issues but it's still not working
i found some information about it, but it was helpless
i checked some issues like:
service not listening - catalina logged about listening
firewall bocked request - no firewall, no antivirus
user can't connect to server - it's running only in localhost
application don't work - correctly work from IDE
Application run correctly from IDE, and also before host restart.
I can't understand why this is happening.
You've missed the point. You have connected to your Servlet. That's how you got the 500 status back from it. Something in the servlet has failed to connect to something else, while it was doing some XML process.
To diagnose the problem follow the list:
telnet the hostname and port from command line telnet {hostname} {port}
If the connection is established it is not an application error, but network problem
look you are not using proxy - if so you need to setup proxy for your application
If connection refused either there is something wrong with your application and possibly with network either.
Its definitely one of the 4 points you listed
OR
you are hitting the wrong port number?
if that is not in those 4 points then Can You check whether the server is started successfully. may be there is a chance of Java Core(.txt file) generation(tomcat/bin folder). so server will not be started perfectly and also there might be chance of corruption in deployment directory. you can redeploy and check.