The exception was java net bindexception cannot assign requested address bind как исправить

Fixing java.net.BindException: Cannot assign requested address: JVM_Bind in Tomcat, Jetty

One of the most dreaded errors in Java-based client server-based applications is a networking-related error, e.g. java.net.BindException: Cannot assign requested address: JVM_Bind. I have faced this issue while working with web servers like Tomcat , Jetty , and Weblogic before, but yesterday it came again when one of my colleagues faced this issue in Windows. As soon as Java programmers see java.net.BindException , they come to the conclusion that it’s an issue with two processes listening on the same port and often mistook it for Java.net.BindException: Address already in use: JVM_Bind:8080, which is slightly different than this.

If you look at Java documentation for java.net.BindExcpetion , you will find this «Signals that an error occurred while attempting to bind a socket to a local address and port. Typically, the port is in use, or the requested local address could not be assigned.»

It’s the second part , which is more interesting in the case of java.net.BindException: Cannot assign requested address: JVM_Bind.

When you start a web server or application server, which typically listens on a port e.g. Tomcat or Jetty listens on 8080 and 8084 for HTTP and HTTPS traffic, they bind a socket to a local address and port. If you give them hostnames like localhost or devhost , then they used /etc/host in both Windows and Linux to resolve the domain name into IP address, if this mapping is incorrect then you will get java.net.BindException: Cannot assign requested address: JVM_Bind .

This host to IP address mapping file can be found at C:WindowsSystem32Driversetchosts , where C:Windows is where you have installed Windows operating system. If you look at this file, you will see it contains IP address and hostname as shown below:

If this mapping is changed and localhost cannot be resolve to 192.168.52.1 then you will get java.net.BindException: Cannot assign requested address: JVM_Bind. You can try by following program to reproduce this issue, remember, you need admin rights to change /etc/host settings in Windows.

If your /etc/host mapping is incorrect then you will see something like

Just, correct the mapping, or add 127.0.0.1 against the localhost to resolve this issue. That’s all about how to fix java.net.BindException: Cannot assign requested address: JVM_Bind error in Java-based client-server application like Minecraft , a popular game in Java, which also communicates with the server and other machines using TCP and sockets. It could also occur when you are using web and application servers like Tomcat, Jetty, or Weblogic as well.

Next time, instead of thinking that two processes are listening on the same port, also think about hostname to IP address resolution issue and verify contents of /etc/host file in both Windows and Linux. Let me know if you are facing this issue and not able to resolve it, pasting the error message and what you are trying to do will help to solve your error quickly and accurately.

How to resolve java.net.BindException: Cannot assign requested address: JVM_Bind in Tomcat

If you are getting this issue in the Tomcat web server then open your server.xml , which contains host and port information for Tomcat connectors. You can find server.xml in location (Windows OS) C:Program FilesApache Software FoundationApache Tomcat 7.0.41confserver.xml . Now look for your connector, if you are using default settings then your connector will look like this :

but if you have modified it to include address=»TestServer» , then look for TestServer mapping in the /etc/hosts file. Try ping with the IP address and see if it is up or not, you will find that it’s incorrect. Just update with the right IP and restart Tomcat.

Similarly, you can resolve java.net.BindException: Cannot assign requested address: JVM_Bind in Jetty or any other web server. The key thing is not to confuse this error with an address already in use error.

All the best and let me know if you face similar issues.

Источник

Minecraft Forums

This thread was marked as Locked by user-6840779 .

FAILED TO BIND TO PORT!

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• Tree Puncher
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Hi. I have problem. I cant start my server.
I get crash:

And my Server.properties:

I restart computer multiple times and I have port forward for all ports.
I googled this and nothing help.
Please help.

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• Tree Puncher
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Still not working and I dont have any programs running on this port.

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Me and my friend had this problem and this is how we fixed it: Completely delete the server and everything that it has, if u have saves back them up, download a completely new server file from Bukkit or minecraft.net what ever youre using, set it up normally and do everything like you usually do EXCEPT writing your ip where it says to, when u run the server for the first time it will automatically find the ip and write it down for you, but if you write it down manually you will get that error, hope I could help.

alright my last post was a little unclear, so do what i told you to in the last post but what I am trying to emphasize is that you DONT write your IP in the properties thing, and remember you have to do this with a fresh minecraft server file. like i said hope i could help.

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Me and my friend had this problem and this is how we fixed it: Completely delete the server and everything that it has, if u have saves back them up, download a completely new server file from Bukkit or minecraft.net what ever youre using, set it up normally and do everything like you usually do EXCEPT writing your ip where it says to, when u run the server for the first time it will automatically find the ip and write it down for you, but if you write it down manually you will get that error, hope I could help.

alright my last post was a little unclear, so do what i told you to in the last post but what I am trying to emphasize is that you DONT write your IP in the properties thing, and remember you have to do this with a fresh minecraft server file. like i said hope i could help.

Nope, still nothing.
I think it’s something with my computer, beacuse I was able to run server, but I have to reinstall windows, becuse of some problems.
I will try to just update drivers.

Источник

Cannot assign requested address using ServerSocket.socketBind

When I’m trying to set up a socket server, I’ve got an error message:

Whole code is simplest as it can be:

I’m 100% sure that my ports are forwarded, Windows Firewall is off. Nothing blocks port 9999. What else can go wrong?

15 Answers 15

It may be related to a misconfiguration in your /etc/hosts . In my case, it was like this: 192.168.1.11 localhost instead of 127.0.0.1 localhost

As other people have pointed out, it is most likely related to another process using port 9999 . On Windows, run the command:

And it should list anything there that’s hogging the port. Of course you’ll then have to go and manually kill those programs in Task Manager. If this still doesn’t work, replace the line:

Of course replace 192.168.1.20 with your actual IP address, or use 127.0.0.1 .

Just for others who may look at this answer in the hope of solving a similar problem, I got a similar message because my ip address changed.

The error says Cannot assign requested address . This means that you need to use the correct address for one of your network interfaces or 0.0.0.0 to accept connections from all interfaces.

The other solutions about ports only work after sometimes-failing black magic (like working after some computer restarts but not others) because the port is completely irrelevant.

Java documentation for java.net.BindExcpetion ,

Signals that an error occurred while attempting to bind a socket to a local address and port. Typically, the port is in use, or the requested local address could not be assigned.

The error is due to the second condition mentioned above. When you start a server(Tomcat,Jetty etc) it listens to a port and bind a socket to an address and port. In Windows and Linux the hostname is resolved to IP address from /etc/hosts This host to IP address mapping file can be found at C:WindowsSystem32Driversetchosts . If this mapping is changed and the host name cannot be resolved to the IP address you get the error message.

Edit the hosts file and correct the mapping for hostname and IP using admin privileges.

Источник

Minecraft Forums

This thread was marked as Locked by user-6840779 .

[Solution] «Failed to bind to port»

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• Coal Miner
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So I lately have seen a lot of posts about the «Failed to bind to port. » message so I decided to post a solution for all of those.

Just to make sure: The message has generally NOTHING to do with your router or port-forwarding!

Common solutions

• The problem is that another instance of the server is already running on that port. If you can’t find the console to that port it may have crashed. To solve that you need to go to your taskmanager and look for a java process and terminate it.
• If you have entered something in «server-ip=» in the server.properties file REMOVE IT!
• The local firewall of your computer could be blocking it. Add .jar/java/javaw as an exception.

Other solutions
The problem can also occur when you aren’t connected to any network. You need to make sure that you are connected to your router. Try the following steps:

• Restart your computer
• Renew your ipconfig
• Open the network and sharing center and Troubleshoot problems (ik that the troubleshooter is sucky in windows but it can help setting up a connection.
• Check if you have your network drivers installed

If nothing works you can try changing the port in the server.properties and check that. If it works then it’ll be most likely that something is using the port already (another server/application). If it still doesn’t work it’s probably firewall issue. You can try disabling it or adding an exception to .jar, java and/or javaw

If you have any other solutions or that doesn’t fix your problem please post it here and I will try to help and resolve the problem.

Edit: Updated with some more cases/solutions

Источник

One of the most dreaded errors in Java-based client server-based applications is a networking-related error, e.g. java.net.BindException: Cannot assign requested address: JVM_Bind. I have faced this issue while working with web servers like Tomcat, Jetty, and Weblogic before, but yesterday it came again when one of my colleagues faced this issue in Windows. As soon as Java programmers see java.net.BindException, they come to the conclusion that it’s an issue with two processes listening on the same port and often mistook it for Java.net.BindException: Address already in use: JVM_Bind:8080, which is slightly different than this.

If you look at Java documentation for java.net.BindExcpetion, you will find this «Signals that an error occurred while attempting to bind a socket to a local address and port. Typically, the port is in use, or the requested local address could not be assigned.»

It’s the second part, which is more interesting in the case of java.net.BindException: Cannot assign requested address: JVM_Bind.

When you start a web server or application server, which typically listens on a port e.g. Tomcat or Jetty listens on 8080 and 8084 for HTTP and HTTPS traffic, they bind a socket to a local address and port. If you give them hostnames like localhost or devhost, then they used /etc/host in both Windows and Linux to resolve the domain name into IP address, if this mapping is incorrect then you will get java.net.BindException: Cannot assign requested address: JVM_Bind.

This host to IP address mapping file can be found at C:WindowsSystem32Driversetchosts, where C:Windows is where you have installed Windows operating system. If you look at this file, you will see it contains IP address and hostname as shown below:

#127.0.0.1 localhost
192.168.52.1 localhost

If this mapping is changed and localhost cannot be resolve to 192.168.52.1 then you will get java.net.BindException: Cannot assign requested address: JVM_Bind. You can try by following program to reproduce this issue, remember, you need admin rights to change /etc/host settings in Windows.

import java.io.IOException;
import java.net.ServerSocket;

public class ServerSocketTesting {

    public static void main(String args[]) throws IOException {

        ServerSocket server = new ServerSocket(8080);
        System.out.println("Server is started, listening connections on port :8080 ");
        server.accept();
    }
}

If your /etc/host mapping is incorrect then you will see something like

Exception in thread "main" java.net.BindException: 
Cannot assign requested address: JVM_Bind
    at java.net.PlainSocketImpl.socketBind(Native Method)
    at java.net.PlainSocketImpl.bind(PlainSocketImpl.java:383)
    at java.net.ServerSocket.bind(ServerSocket.java:328)
    at java.net.ServerSocket.(ServerSocket.java:194)
    at java.net.ServerSocket.(ServerSocket.java:106)

Just, correct the mapping, or add 127.0.0.1 against the localhost to resolve this issue.  That’s all about how to fix java.net.BindException: Cannot assign requested address: JVM_Bind error in Java-based client-server application like Minecraft, a popular game in Java, which also communicates with the server and other machines using TCP and sockets. It could also occur when you are using web and application servers like Tomcat, Jetty, or Weblogic as well.

Next time, instead of thinking that two processes are listening on the same port, also think about hostname to IP address resolution issue and verify contents of /etc/host file in both Windows and Linux. Let me know if you are facing this issue and not able to resolve it, pasting the error message and what you are trying to do will help to solve your error quickly and accurately.

How to resolve java.net.BindException: Cannot assign requested address: JVM_Bind in Tomcat

If you are getting this issue in the Tomcat web server then open your server.xml, which contains host and port information for Tomcat connectors. You can find server.xml in location (Windows OS) C:Program FilesApache Software FoundationApache Tomcat 7.0.41confserver.xml. Now look for your connector, if you are using default settings then your connector will look like this :

 <Connector port="8080" protocol="HTTP/1.1"
               connectionTimeout="20000"
               redirectPort="8443" />

but if you have modified it to include address=»TestServer», then look for TestServer mapping in the/etc/hosts file. Try ping with the IP address and see if it is up or not, you will find that it’s incorrect. Just update with the right IP and restart Tomcat.

Similarly, you can resolve java.net.BindException: Cannot assign requested address: JVM_Bind in Jetty or any other web server. The key thing is not to confuse this error with an address already in use error.

All the best and let me know if you face similar issues.

Troubleshooting

at java.net.PlainSocketImpl.socketBind(Native Method)
at java.net.PlainSocketImpl.bind(PlainSocketImpl.java:357)
at java.net.Socket.bind(Socket.java:524)
at com.ibm.rmi.transport.TCPTransportConnection.createSocket(TCPTransportConnection.java:165)

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Title : Fixing Java.Net.Bindexception: Cannot Assign Requested Address: Jvm_Bind Inwards Tomcat, Jetty
link : Fixing Java.Net.Bindexception: Cannot Assign Requested Address: Jvm_Bind Inwards Tomcat, Jetty

Fixing Java.Net.Bindexception: Cannot Assign Requested Address: Jvm_Bind Inwards Tomcat, Jetty

#127.0.0.1 localhost 192.168.52.1 localhost

import java.io.IOException; import java.net.ServerSocket;  public class ServerSocketTesting {      public static void main(String args[]) throws IOException {          ServerSocket server = new ServerSocket(8080);         System.out.println("Server is started, listening connections on port :8080 ");         server.accept();     } }

Exception inward thread "main" java.net.BindException: Cannot assign requested address: JVM_Bind     at java.net.PlainSocketImpl.socketBind(Native Method)     at java.net.PlainSocketImpl.bind(PlainSocketImpl.java:383)     at java.net.ServerSocket.bind(ServerSocket.java:328)     at java.net.ServerSocket.(ServerSocket.java:194)     at java.net.ServerSocket.(ServerSocket.java:106)

 <Connector port="8080" protocol="HTTP/1.1"                connectionTimeout="20000"                redirectPort="8443" />