java.net.BindException: Cannot assign requested address on cloud foundry

[ashok kumar]

Hi All,

I have SpringBoot application running on PCF and I set output="tcpserver", port="6335" and address="<IP Address of VM>" and while starting the application, seeinb below exception. Appreciate your help on this.

2020-10-14T15:36:01.308-05:00 [APP/PROC/WEB/0] [ERR] java.net.BindException: Cannot assign requested address (Bind failed)

2020-10-14T15:36:01.308-05:00 [APP/PROC/WEB/0] [ERR] at java.net.AbstractPlainSocketImpl.bind(AbstractPlainSocketImpl.java:387)

2020-10-14T15:36:01.308-05:00 [APP/PROC/WEB/0] [ERR] at java.net.ServerSocket.bind(ServerSocket.java:390)

2020-10-14T15:36:01.308-05:00 [APP/PROC/WEB/0] [ERR] at org.jacoco.agent.rt.internal_43f5073.Agent.getInstance(Agent.java:54)

2020-10-14T15:36:01.308-05:00 [APP/PROC/WEB/0] [ERR] at org.jacoco.agent.rt.internal_43f5073.PreMain.premain(PreMain.java:50)

2020-10-14T15:36:01.309-05:00 [APP/PROC/WEB/0] [ERR] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

2020-10-14T15:36:01.309-05:00 [APP/PROC/WEB/0] [ERR] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

2020-10-14T15:36:01.309-05:00 [APP/PROC/WEB/0] [ERR] at java.lang.reflect.Method.invoke(Method.java:498)

2020-10-14T15:36:01.309-05:00 [APP/PROC/WEB/0] [ERR] at sun.instrument.InstrumentationImpl.loadClassAndStartAgent(InstrumentationImpl.java:386)

2020-10-14T15:36:01.309-05:00 [APP/PROC/WEB/0] [ERR] at sun.instrument.InstrumentationImpl.loadClassAndCallPremain(InstrumentationImpl.java:401)

2020-10-14T15:36:01.309-05:00 [APP/PROC/WEB/0] [ERR] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

2020-10-14T15:36:01.310-05:00 [APP/PROC/WEB/0] [ERR] at sun.instrument.InstrumentationImpl.loadClassAndCallPremain(InstrumentationImpl.java:401)

2020-10-14T15:36:01.310-05:00 [APP/PROC/WEB/0] [ERR] Caused by: java.net.BindException: Cannot assign requested address (Bind failed)

2020-10-14T15:36:01.310-05:00 [APP/PROC/WEB/0] [ERR] at java.net.ServerSocket.bind(ServerSocket.java:390)

2020-10-14T15:36:01.310-05:00 [APP/PROC/WEB/0] [ERR] at org.jacoco.agent.rt.internal_43f5073.output.TcpServerOutput.startup(TcpServerOutput.java:54)

2020-10-14T15:36:01.310-05:00 [APP/PROC/WEB/0] [ERR] at org.jacoco.agent.rt.internal_43f5073.Agent.startup(Agent.java:129)

2020-10-14T15:36:01.311-05:00 [APP/PROC/WEB/0] [ERR] at org.jacoco.agent.rt.internal_43f5073.Agent.getInstance(Agent.java:54)

Regards,

Ashok

[Marc Hoffmann]

Hi,

I don’t know how PCF works. But probably the “IP Adress of VM” is not available where the application is installed (container?).

You can simply specify address=* to bind to any available address.

Regards,

-marc

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[ashok kumar]

Thanks Marc for quick response. 

The VM is accessible if I set output as "tcpclient" and able to capture the coverage data and would like to try with tcpserver too. I think if I try to use "address=*" agent is going to write to the VM where PCF is running and we dont want to try * because no ports on VM where PCF container is running is not allowed.

I have couple of questions - 

1. I dont see much difference between tcpserver and tcpclient modes because we are going to supply same values. May be I am missing something.

Regards,

Ashok

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[Marc Hoffmann]

There is a big difference in the semantic of the address attribute:

* tcpclient: address is the IP address to connect to. This could be on any machine, as long as it is reachable

* tcpserver: address is the local IP address the agent binds to. This address must be configured on a accessible local interface, local process must have permission to open that server port

So if “because no ports on VM where PCF container is running is not allowed” is correct, you cannot use tcpserver on PCF.

Regards,

-marc

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[ashok kumar]

Thanks Marc for the detailed explanation.

I thought we can provide any remote IP address tcpserver which is not true. If only local addresses are allowed, why need to make it as a parameter rather than hard code to the local address?

Regards,

Ashok

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[Marc Hoffmann]

You don’t have to specify it. Loopback is default. Please have a look at the documentation:

https://www.jacoco.org/jacoco/trunk/doc/agent.html

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[ashok kumar]

Thanks Marc for quick response. It's pretty much clear now.

Regards,

Ashok

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[Evgeny Mandrikov]

On Thursday, October 15, 2020 at 3:49:45 PM UTC+2 ashok.ob...@gmail.com wrote:

Thanks Marc for the detailed explanation.

I thought we can provide any remote IP address tcpserver which is not true. If only local addresses are allowed, why need to make it as a parameter rather than hard code to the local address?

Because one machine can have multiple IP addresses.

By default tcpserver binds to loopback ( 127.0.0.1 ) and configurable option exists to bind to other addresses.

[ashok kumar]

Thanks Evgeny Mandrikov.

Regards,

Ashok

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