Build failed in Jenkins: Struts-JDK6-develop #41

[Apache Jenkins Server]

See <https://builds.apache.org/job/Struts-JDK6-develop/41/>

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Started by an SCM change
Building remotely on ubuntu6 (Ubuntu ubuntu) in workspace 
<https://builds.apache.org/job/Struts-JDK6-develop/ws/>
Fetching changes from the remote Git repository
Fetching upstream changes from http://git.apache.org/struts.git
FATAL: Failed to fetch from http://git.apache.org/struts.git
hudson.plugins.git.GitException: Failed to fetch from 
http://git.apache.org/struts.git
        at hudson.plugins.git.GitSCM.fetchFrom(GitSCM.java:621)
        at hudson.plugins.git.GitSCM.retrieveChanges(GitSCM.java:853)
        at hudson.plugins.git.GitSCM.checkout(GitSCM.java:878)
        at hudson.model.AbstractProject.checkout(AbstractProject.java:1320)
        at 
hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:609)
        at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:88)
        at 
hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:518)
        at hudson.model.Run.execute(Run.java:1700)
        at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:519)
        at hudson.model.ResourceController.execute(ResourceController.java:88)
        at hudson.model.Executor.run(Executor.java:231)
Caused by: hudson.plugins.git.GitException: Command "git fetch --tags 
--progress http://git.apache.org/struts.git 
+refs/heads/*:refs/remotes/origin/*" returned status code 128:
stdout: 
stderr: error: Empty reply from server (curl_result = 52, http_code = 0, sha1 = 
66821c40a2a359c47f5bab623360c98170413537)
error: Unable to find acc41ad0a4aea3b10587608b7bbe341338e28f8c under 
http://git.apache.org/struts.git
Cannot obtain needed tree acc41ad0a4aea3b10587608b7bbe341338e28f8c
while processing commit 7908a88a405458869f61ecff4b775429724a3ea4.
error: Fetch failed.

        at 
org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandIn(CliGitAPIImpl.java:1183)
        at 
org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandWithCredentials(CliGitAPIImpl.java:1053)
        at 
org.jenkinsci.plugins.gitclient.CliGitAPIImpl.access$200(CliGitAPIImpl.java:88)
        at 
org.jenkinsci.plugins.gitclient.CliGitAPIImpl$1.execute(CliGitAPIImpl.java:219)
        at 
org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler$1.call(RemoteGitImpl.java:153)
        at 
org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler$1.call(RemoteGitImpl.java:146)
        at hudson.remoting.UserRequest.perform(UserRequest.java:118)
        at hudson.remoting.UserRequest.perform(UserRequest.java:48)
        at hudson.remoting.Request$2.run(Request.java:328)
        at 
hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72)
        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
        at java.util.concurrent.FutureTask.run(FutureTask.java:166)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:724)

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