Intellij Idea Maven 'cannot reconnect' error

Question

Maybe you can help me I got a strange apache maven's problem, when opening my project at Intellij Idea 13. When projects was open I have no libraries at External Libraries section. And at all pom.xml files from diff's modules I see error "Cannot reconnect". enter image description here

I tried to Invalidate Cache/Restart Idea, try to use Maven Reimport but problem still take a place. But if I do mvn clean install, and deploy my projects everything works fine. I use Maven 3.2.3. and Java 1.8.

Maven settings: enter image description here

Aded idea.log files:

2015-06-03 11:54:24,585 [ 441715]   INFO -      #org.jetbrains.idea.maven - Cannot reconnect. 
java.lang.RuntimeException: Cannot reconnect.
    at org.jetbrains.idea.maven.server.RemoteObjectWrapper.perform(RemoteObjectWrapper.java:98)
    at org.jetbrains.idea.maven.server.MavenEmbedderWrapper.resolveProject(MavenEmbedderWrapper.java:97)
    at org.jetbrains.idea.maven.project.MavenProjectReader.resolveProject(MavenProjectReader.java:462)
    at org.jetbrains.idea.maven.project.MavenProject.resolve(MavenProject.java:624)
    at org.jetbrains.idea.maven.project.MavenProjectsTree.resolve(MavenProjectsTree.java:1215)
    at org.jetbrains.idea.maven.project.MavenProjectsProcessorResolvingTask.perform(MavenProjectsProcessorResolvingTask.java:42)
    at org.jetbrains.idea.maven.project.MavenProjectsProcessor.doProcessPendingTasks(MavenProjectsProcessor.java:131)
    at org.jetbrains.idea.maven.project.MavenProjectsProcessor.access$100(MavenProjectsProcessor.java:28)
    at org.jetbrains.idea.maven.project.MavenProjectsProcessor$2.run(MavenProjectsProcessor.java:107)
    at org.jetbrains.idea.maven.utils.MavenUtil$6.run(MavenUtil.java:440)
    at com.intellij.openapi.application.impl.ApplicationImpl$8.run(ApplicationImpl.java:419)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
    at java.util.concurrent.FutureTask.run(FutureTask.java:262)
    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:745)
    at com.intellij.openapi.application.impl.ApplicationImpl$1$1.run(ApplicationImpl.java:149)
Caused by: java.rmi.ServerError: Error occurred in server thread; nested exception is: 
    java.lang.NoClassDefFoundError: org/apache/commons/lang/StringUtils
    at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:351)
    at sun.rmi.transport.Transport$1.run(Transport.java:200)
    at sun.rmi.transport.Transport$1.run(Transport.java:197)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
    at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:568)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:826)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$254(TCPTransport.java:683)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler$$Lambda$1/99407688.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:682)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)
    at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:275)
    at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:252)
    at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:161)
    at java.rmi.server.RemoteObjectInvocationHandler.invokeRemoteMethod(RemoteObjectInvocationHandler.java:194)
    at java.rmi.server.RemoteObjectInvocationHandler.invoke(RemoteObjectInvocationHandler.java:148)
    at com.sun.proxy.$Proxy121.resolveProject(Unknown Source)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at com.intellij.execution.rmi.RemoteUtil$2$1$1.compute(RemoteUtil.java:106)
    at com.intellij.execution.rmi.RemoteUtil.executeWithClassLoader(RemoteUtil.java:167)
    at com.intellij.execution.rmi.RemoteUtil$2$1.invoke(RemoteUtil.java:102)
    at com.sun.proxy.$Proxy121.resolveProject(Unknown Source)
    at org.jetbrains.idea.maven.server.MavenEmbedderWrapper$4.execute(MavenEmbedderWrapper.java:100)
    at org.jetbrains.idea.maven.server.MavenEmbedderWrapper$4.execute(MavenEmbedderWrapper.java:97)
    at org.jetbrains.idea.maven.server.RemoteObjectWrapper.perform(RemoteObjectWrapper.java:89)
    ... 16 more
Caused by: java.lang.NoClassDefFoundError: org/apache/commons/lang/StringUtils
    at org.apache.maven.wagon.providers.file.FileWagon.resolveDestinationPath(FileWagon.java:206)
    at org.apache.maven.wagon.providers.file.FileWagon.resourceExists(FileWagon.java:265)
    at org.sonatype.aether.connector.wagon.WagonRepositoryConnector$GetTask.run(WagonRepositoryConnector.java:577)
    at org.sonatype.aether.util.concurrency.RunnableErrorForwarder$1.run(RunnableErrorForwarder.java:60)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)
2015-06-03 11:54:24,586 [ 441716]   WARN - ution.rmi.RemoteProcessSupport - Exception in thread "pool-6-thread-1" java.lang.NoClassDefFoundError: org/apache/commons/lang/StringUtils 
2015-06-03 11:54:24,586 [ 441716]   WARN - ution.rmi.RemoteProcessSupport - at org.apache.maven.wagon.providers.file.FileWagon.resolveDestinationPath(FileWagon.java:206)

My guess is that there is a problem with your IntelliJ Maven plugin, but that running Maven from the command line is working without issue. — Tim Biegeleisen, Jun 03 '15 at 08:51
@TimBiegeleisen - you could right click and open it in new tab. It is big enough. @MeetJoeBlack - please check `idea.log` and see what error details are present there. — ring bearer, Jun 03 '15 at 08:51
Have you tried using the bundled Maven instead of the command line one? http://puu.sh/iaG9U/bd94fce2ba.png — Crembo, Jun 03 '15 at 09:01
My problem was solved by updating /etc/hosts file. [Refer this](https://stackoverflow.com/a/12702961/1686291) — Not a bug, Dec 04 '18 at 17:02
@Notabug My man, saved my day. This issue was irritating and I was simply switching the JDK for importer multiple times in a session. In my hosts file 127.0.0.1 was mapped to Kubernetes as well by docker desktop apart from localhost. Commented out and it works like a charm now. Thank you. — cyanotrix, Feb 09 '23 at 11:32

score 193 · Answer 1 · edited Apr 23 '21 at 19:27

193

I was facing the same error and fixed it like that:

Open settings by pressing Ctrl+Alt+S and navigate to Build, Execution, Deployment | Build Tools | Maven | Importing
Check JDK for Importer and change the exact version of JDK (example : 1.8.0.250) installed on your machine from the drop-down.

After doing the same it prompts for verification and after that, the maven will be automatically updated and the project will run.

In my case, I did the same thing as the JDK which is used in the machine is different when the project is imported from a repository. These things happen when we uninstall the IDE and JDK and install the IDE and different version of JDK, the IDE automatically fetch the project which is available in the machine as before but it can not change the imported JDK.

edited Apr 23 '21 at 19:27

ax.

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answered May 02 '20 at 13:29

Subhajit

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This should be marked as the solution instead. – Marks Gniteckis Apr 15 '21 at 08:07
This works for me for a while then it fails again and I need to switch again (switching to any option works). It seems the problem lies somewhere else but you can work around it switching JDK from time to time. – domaru Jun 21 '21 at 15:16
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Amazingly, this actually worked for me even though it was already set correctly. I just selected it again from the dropdown, pressed Apply and OK, and I was able to download just fine. Strange! – devinbost Oct 06 '21 at 19:24
This worked for me just through opening the settings page and clicking “OK” to close the dialog – I had nothing to change. Next time I’ll try opening the dialog without navigating to that screen (because this happens to me for time to time as well…) – Didier L Aug 22 '22 at 13:33
In the end what really works for me is clicking reload project until it succeeds… It might be that IntelliJ doesn’t like the fact that Docker Desktop messes with the hosts file, looking at _Not a bug_’s comment on the question – Didier L Sep 23 '22 at 16:15
Changing the project SDK had the same effect for me (without ever touching Maven settings) – hughjdavey Jan 12 '23 at 12:47
If you are getting this repeatedly then please check the hosts file as commented above by @Notabug. In my case I was getting this even after changing the JDK for importer. It was an issue with my hosts file. – cyanotrix Feb 09 '23 at 11:33
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For anyone, with multiple java versions like me, you need to select the version set as JAVA_HOME for this to work. – Skillzore Mar 16 '23 at 09:21

score 23 · Answer 2 · edited Aug 18 '17 at 11:21

23

I fixed this by changing my local Maven 3.3.9 to Idea Bundle Maven3.

edited Aug 18 '17 at 11:21

Cody Gray - on strike

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answered Aug 18 '17 at 09:40

luffy

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How did you do that? – parsecer Apr 12 '20 at 19:56
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@parsecer Preferences -> Build, Execution, Deployment -> Build Tools -> Maven -> Maven home directory (drop down). This solution worked for me as well. – Srikanth Reddy Lingala Aug 07 '20 at 05:48
I already have the bundled one but still getting this error. – domaru Jun 21 '21 at 15:17

score 23 · Answer 3 · answered Feb 24 '21 at 21:13

23

Clicking on Reload All Maven Projects helped me in this scenario.

answered Feb 24 '21 at 21:13

matua

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This is one of my default actions I consider before googling if I have trouble with maven, and it did not help in my case – sinned Apr 19 '21 at 07:41
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For me the problem happens exactly after I click the icon – domaru Jun 21 '21 at 15:18
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Click once more. – matua Jun 22 '21 at 12:19
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Amazing, after clicking a few times, it sync'ed! Seems like some random behavior. – auspicious99 Jun 11 '22 at 19:26
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clicking a few times on refresh button: one of the silliest and stupidest bugs you may be faced and its remarkable solution – Mustafa Güven Oct 03 '22 at 17:30

score 9 · Answer 4 · answered Apr 27 '21 at 15:17

9

File -> Invalid Cache

might also be helpful in a scenario where IntelliJ seems to tangle up itself.

answered Apr 27 '21 at 15:17

Simeon

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Nothing else worked for me, except this.... Hitting Invalidate Cache.... It instantly reloaded everything from top to bottom as like new.... I was trying hard for hours on this, but this solution helped me get around the issue.... You're a saviour man, Thank you – Aravindh Sivalingam Sep 14 '21 at 10:38
Any weird intellij issue -> invalidate caches. Downside is you need to restart the app and with it all the services you're running. – gdrt Dec 14 '22 at 18:29

score 3 · Answer 5 · answered Jan 25 '23 at 11:21

3

In case you are running InteliJ in WSL with X-Server (e.g. VcXsrv), a solution may be to

close InteliJ
restart the server
open Intelij

and it will be working.

answered Jan 25 '23 at 11:21

LoukasPap

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For those working with WSL try this first. it also fixed it for me. – WinterBoot Feb 21 '23 at 12:26

score 1 · Answer 6 · answered Apr 10 '21 at 08:23

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I fixed this problem by removing .lastUpdated files coming from transfer error in ~/.m2

find ~/.m2  -name "*.lastUpdated" -exec grep -q "Could not transfer" {} \; -print -exec rm {} \;

answered Apr 10 '21 at 08:23

Ortomala Lokni

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score 1 · Answer 7 · answered Apr 27 '23 at 12:56

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In my case, restarting IntelliJ solved the problem.

answered Apr 27 '23 at 12:56

Florian Kirmaier

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Same for me... Just restart it and everything works well – ch271828n Jul 25 '23 at 01:12

score 0 · Answer 8 · answered Apr 09 '21 at 08:57

I was getting this error and I fixed this error in IntelliJ by following steps:

1] close all running application(if any)
2] reimport/reload pom.xml (right-click on pom.xml -> select maven option->reimport/reload project)
3] then run your application(i.e. main file) by following this I did not needed to delete the .m2 folder manually

score 0 · Answer 9 · answered Jan 12 '23 at 10:41

In my case, I have maven runner and importer set to use Project JDK, but I managed to solve this problem by changing JDK from OpenJDK to Liberica JDK (same Java version) and it magically started working.

So for anyone with similar problem, try to change JDK to different implementation.

Sandeep Kumar · Answer 10 · 2023-07-22T16:13:38.983

Cause IDE launches Maven import in a separate java process and communicates with it using java RMI calls which work via local loopback interface (localhost). To access the loopback interface the localhost hostname is used. When IDE is unable to establish connection to a localhost this error occurs. There could be several causes why localhost is not accessible:

DNS misconfiguration The 127.0.0.1 is the standard address for IPv4 loopback traffic and the localhost name must resolve to 127.0.0.1 IPv4 address. If it is not - the error will occur.

Antivirus or firewall blocks connections to localhost

Resolution Make sure the localhost hostname resolves to 127.0.0.1 IPv4 loopback address. It is better to leave only localhost name for the 127.0.0.1 address. For this the hosts file must have only following lines for mapping localhost to IPv4 and IPv6 local addresses:

Quick Solution restart the Intelij IDE.

Intellij Idea Maven 'cannot reconnect' error

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