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Bleeding edge of development – upgrading system and ANT stops working

Written by Toomas Römer on December 28, 2009 – 5:32 pm

I run Debian Unstable as my main desktop system. I shoot myself in the foot couple of times a year with the upgrades but I like using the bleeding edge of development.

Today after my “regular” upgrade I noticed that one of the ANT tasks did not perform as I would have expected.

/home/toomasr/workspace/project/build.xml:459: The following error occurred while executing this line:
/home/toomasr/workspace/project/changelogic-build.xml:72: Please check the correctness of the root url property. The server returned HTTP response code 300 or above for the URL http://172.17.57.242/lib/changelogic-build.xml

A quick ant -debug did not help me much.

/home/toomasr/workspace/project/build.xml:459: The following error occurred while executing this line:
/home/toomasr/workspace/project/changelogic-build.xml:72: Please check the correctness of the root url property. The server returned HTTP response code 300 or above for the URL http://172.17.57.242/lib/changelogic-build.xml                                                                                                                                       
        at org.apache.tools.ant.ProjectHelper.addLocationToBuildException(ProjectHelper.java:508)                                                                                   
        at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java:369)                                                                                                                  
        at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)                                                                                                     
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)                                                                                                              
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)                                                                                            
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)                                                                                    
        at java.lang.reflect.Method.invoke(Method.java:597)                                                                                                                         
        at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)                                                                                              
        at org.apache.tools.ant.Task.perform(Task.java:348)                                                                                                                         
        at org.apache.tools.ant.Target.execute(Target.java:357)                                                                                                                     
        at org.apache.tools.ant.Target.performTasks(Target.java:385)                                                                                                                
        at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1337)
        at org.apache.tools.ant.Project.executeTarget(Project.java:1306)
        at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
        at org.apache.tools.ant.Project.executeTargets(Project.java:1189)
        at org.apache.tools.ant.Main.runBuild(Main.java:758)
        at org.apache.tools.ant.Main.startAnt(Main.java:217)
        at org.apache.tools.ant.launch.Launcher.run(Launcher.java:257)
        at org.apache.tools.ant.launch.Launcher.main(Launcher.java:104)
Caused by: /home/toomasr/workspace/project/changelogic-build.xml:72: Please check the correctness of the root url property. The server returned HTTP response code 300 or above for the URL http://172.17.57.242/lib/changelogic-build.xml
        at org.apache.tools.ant.taskdefs.Exit.execute(Exit.java:142)
        at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
        at sun.reflect.GeneratedMethodAccessor6.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
        at org.apache.tools.ant.Task.perform(Task.java:348)
        at org.apache.tools.ant.Target.execute(Target.java:357)
        at org.apache.tools.ant.helper.ProjectHelper2.parse(ProjectHelper2.java:142)
        at org.apache.tools.ant.ProjectHelper.configureProject(ProjectHelper.java:93)
        at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java:367)
        ... 17 more
--- Nested Exception ---
/home/toomasr/workspace/project/changelogic-build.xml:72: Please check the correctness of the root url property. The server returned HTTP response code 300 or above for the URL http://172.17.57.242/lib/changelogic-build.xml
        at org.apache.tools.ant.taskdefs.Exit.execute(Exit.java:142)
        at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
        at sun.reflect.GeneratedMethodAccessor6.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
        at org.apache.tools.ant.Task.perform(Task.java:348)
        at org.apache.tools.ant.Target.execute(Target.java:357)
        at org.apache.tools.ant.helper.ProjectHelper2.parse(ProjectHelper2.java:142)
        at org.apache.tools.ant.ProjectHelper.configureProject(ProjectHelper.java:93)
        at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java:367)
        at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
        at org.apache.tools.ant.Task.perform(Task.java:348)
        at org.apache.tools.ant.Target.execute(Target.java:357)
        at org.apache.tools.ant.Target.performTasks(Target.java:385)
        at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1337)
        at org.apache.tools.ant.Project.executeTarget(Project.java:1306)
        at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
        at org.apache.tools.ant.Project.executeTargets(Project.java:1189)
        at org.apache.tools.ant.Main.runBuild(Main.java:758)
        at org.apache.tools.ant.Main.startAnt(Main.java:217)
        at org.apache.tools.ant.launch.Launcher.run(Launcher.java:257)
        at org.apache.tools.ant.launch.Launcher.main(Launcher.java:104)
 
Total time: 3 seconds

The access log on the server did not show anything for the request. Browsing to the url with FireFox worked just fine. Where to even start debugging this? The simple env did not show any proxies configured either. Quite lost.

At last I decided to trace the problem with strace. strace -f ant my_target > result 2>&1 produced 35 892 lines of output. Searching for the ip showed me the message

35596 [pid 13544] connect(46, {sa_family=AF_INET6, sin6_port=htons(80), inet_pton(AF_INET6, "::ffff:172.17.57.242", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=0}, 28) = -1 ENETUNR      EACH (Network is unreachable)

Weehah, I’m getting somewhere! Googling a bit showed me multiple solutions. Either a system wide sysctl -w net.ipv6.bindv6only=0 or just -Djava.net.preferIPv4Stack=true will do the trick. I hope this helps somebody.


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