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    This bug happens on jenkins 2.1 with gitLab plugin 1.2.2, try updating plugin to 1.2.3 or further.

Solutions on the web

via Jenkins JIRA by Ratn Dwivedi, 1 year ago
Connection not obtained from this manager
via Jenkins JIRA by Ratn Dwivedi, 1 year ago
Connection not obtained from this manager
via Stack Overflow by Eugen
, 2 years ago
via Stack Overflow by CDU
, 2 years ago
Invalid use of BasicClientConnManager: connection still allocated. Make sure to release the connection before allocating another one.
via GitHub by mohataher
, 2 years ago
Connection pool shut down
via GitHub by mohataher
, 7 months ago
Connection pool shut down
java.lang.IllegalStateException: Connection not obtained from this manager	at org.apache.http.util.Asserts.check(Asserts.java:34)	at org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager.releaseConnection(ThreadSafeClientConnManager.java:252)	at org.apache.http.impl.conn.AbstractClientConnAdapter.abortConnection(AbstractClientConnAdapter.java:338)	at org.apache.http.impl.client.DefaultRequestDirector.abortConnection(DefaultRequestDirector.java:1119)	at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:590)	at org.apache.http.impl.client.AbstractHttpClient.doExecute(AbstractHttpClient.java:858)	at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:76)	at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:97)	at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:58)	at com.amazonaws.http.AmazonHttpClient.executeHelper(AmazonHttpClient.java:262)	at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:169)	at com.amazonaws.services.ec2.AmazonEC2Client.invoke(AmazonEC2Client.java:5684)	at com.amazonaws.services.ec2.AmazonEC2Client.describeRegions(AmazonEC2Client.java:768)	at com.amazonaws.services.ec2.AmazonEC2Client.describeRegions(AmazonEC2Client.java:4534)	at hudson.plugins.ec2.AmazonEC2Cloud$DescriptorImpl.doFillRegionItems(AmazonEC2Cloud.java:96)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:282)	at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:149)	at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:88)	at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:104)	at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)	at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:561)	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:646)	at org.kohsuke.stapler.MetaClass$6.doDispatch(MetaClass.java:234)	at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)	at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:561)	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:646)	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:477)	at org.kohsuke.stapler.Stapler.service(Stapler.java:159)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)	at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:491)	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1074)	at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:94)	at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:86)	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1065)	at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:47)	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1065)	at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84)	at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76)	at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:164)	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1065)	at hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:81)	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1065)