Error message when debugging in Eclipse

[tiroxino]

Hello,
I can't debug in Eclipse. It shows "cannot connect to VM"
and the console shows:

ERROR: transport error 202: connect failed: No route to host
ERROR: JDWP Transport dt_socket failed to initialize, TRANSPORT_INIT(510)
JDWP exit error AGENT_ERROR_TRANSPORT_INIT(197): No transports initialized [../../../src/share/back/debugInit.c:690]
FATAL ERROR in native method: JDWP No transports initialized, jvmtiError=AGENT_ERROR_TRANSPORT_INIT(197)


Thanks.

[tiroxino]

I found some information about the bug: http://forum.java.sun.com/thread.jspa?threadID=618145

I tried to solve the problem editing /etc/hosts. Now it shows this:
127.0.0.1 localhost

but that doesn't solve the problem. I still get the same error when debugging, for example in the shell:

$ jdb Prueba01.java
Initializing jdb ...
> run
run Prueba01.java
VM start exception: VM initialization failed for: /usr/lib/jvm/java-6-sun-1.6.0.00/jre/bin/java -Xdebug -Xrunjdwp:transport=dt_socket,address=127.0.0.1:476 63,suspend=y Prueba01.java

ERROR: transport error 202: connect failed: No route to host
ERROR: JDWP Transport dt_socket failed to initialize, TRANSPORT_INIT(510)
JDWP exit error AGENT_ERROR_TRANSPORT_INIT(197): No transports initialized [../../../src/share/back/debugInit.c:690]
FATAL ERROR in native method: JDWP No transports initialized, jvmtiError=AGENT_ERROR_TRANSPORT_INIT(197)

Fatal error:
Target VM failed to initialize.

Can anyone help me, please?

Thanks

[eap1935]

This problem still exists in Intrepid, so here's a workaround. This also fixes problems connecting to processes using JConsole and debugging in NetBeans.

The trouble is in /etc/hosts. Ubuntu places "127.0.0.1 <hostname-you-picked-when-you-installed>" in there by default. For whatever reason, with this default setup, Ubuntu is unable to report hostname properly. If you issue hostname -i to get the IP address, it reports a nonsense address, not the DHCP'd address, and not even the address of the DHCP host. So the solution is to associate your actual IP address with <hostname-you-picked-when-you-installed> in /etc/hosts.

For me, I'm behind NAT, so I set up a static IP address and I replaced the default /etc/hosts line with this:

127.0.0.1 localhost.localdomain localhost
192.168.1.4 toodles-laptop

Then when I issue hostname -i the system reports 192.168.1.4 and Java is happy making JMX and debug connections. JConsole works, and I can debug in both Eclipse and NetBeans.

This will also work using DHCP (as opposed to assigning a static IP), but only till the DHCP server gives you a new IP address. Then you'll have to update /etc/hosts again, reboot and hope you get the same IP address :) If anyone knows how to do this properly with DHCP, please correct me here.

[chinni.joy]

hi eap1935,

you are reply is worked for me. thanq.

[dwhitney67]

This problem still exists in Intrepid, so here's a workaround. This also fixes problems connecting to processes using JConsole and debugging in NetBeans.

The trouble is in /etc/hosts. Ubuntu places "127.0.0.1 <hostname-you-picked-when-you-installed>" in there by default. For whatever reason, with this default setup, Ubuntu is unable to report hostname properly. If you issue hostname -i to get the IP address, it reports a nonsense address, not the DHCP'd address, and not even the address of the DHCP host. So the solution is to associate your actual IP address with <hostname-you-picked-when-you-installed> in /etc/hosts.

For me, I'm behind NAT, so I set up a static IP address and I replaced the default /etc/hosts line with this:

127.0.0.1 localhost.localdomain localhost
192.168.1.4 toodles-laptop

Then when I issue hostname -i the system reports 192.168.1.4 and Java is happy making JMX and debug connections. JConsole works, and I can debug in both Eclipse and NetBeans.

This will also work using DHCP (as opposed to assigning a static IP), but only till the DHCP server gives you a new IP address. Then you'll have to update /etc/hosts again, reboot and hope you get the same IP address :) If anyone knows how to do this properly with DHCP, please correct me here.

Typically the localhost (and localhost.localdomain) are assigned 127.0.0.1.

Intrepid (and previous Ubuntu distros I have used), assigned one's chosen hostname to 127.0.1.1.

Of course, one is free to assign a different IP than the default 127.0.1.1 (as you have done). As for the localhost, it should always remain as 127.0.0.1.

[elonderin]

has anybody solved this problem for DHCP ? ie. that this works automatically?

my situation is such that i use ubuntu in VM at home and at work.
my vm network is "bridged" so others can also get to the server and as a consequence it gets quite diff. IPs assigned when i'm at work and at home.

,sure i can keep updating the hosts file but that is bothersome.

thx