Donato Perconti :

Summary

I've seen a few questions [1] [2] [3] that resemble this somewhat, but none of the answers have produced any sort of success.

So, here are the issues that I am seeing:

1) The pom is indicating that it is not able to connect to the local .m2 repository.

2) The Maven setting in Intellij is showing an error that the connection to the local .m2 repository is refused.

What I have tried so far:

Pretty much everything in the linked issues. Including:

1) Delete the entire .m2/repository folder manually, and then update your Maven project again.

2) Invalidate your Idea cache and restart Idea.

3) increasing Maven's allocated memory

4) Setting localhost to only 127.0.0.1

5) Adding -Djava.net.preferIPv4Stack=true flag

6) Starting Intellij with Java 1.7 instead of 1.8

7) Uninstalling and re-installing Maven, Java, and Intellij

Other information:

$ java -version
java version "1.8.0_144"
Java(TM) SE Runtime Environment (build 1.8.0_144-b01)
Java HotSpot(TM) 64-Bit Server VM (build 25.144-b01, mixed mode)

$ echo $JAVA_HOME
/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home

$ mvn -version
Apache Maven 3.5.0 (ff8f5e7444045639af65f6095c62210b5713f426; 2017-04-03T12:39:06-07:00)
Maven home: /usr/local/apache-maven-3.5.0
Java version: 1.8.0_144, vendor: Oracle Corporation
Java home: /Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "mac os x", version: "10.12.6", arch: "x86_64", family: "mac"

Any help is greatly appreciated.

Idea.log

2017-08-29 13:16:51,471 [12172337]   WARN -      #org.jetbrains.idea.maven - Failed to update Maven indices for: [local] /Users/donato/.m2/repository 
org.jetbrains.idea.maven.server.MavenServerIndexerException: Connection refused to host: localhost; nested exception is: 
    java.net.ConnectException: Connection refused (Connection refused)
    at org.jetbrains.idea.maven.server.Maven3ServerIndexerImpl.updateIndex(Maven3ServerIndexerImpl.java:221)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:346)
    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$0(TCPTransport.java:683)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:682)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:748)
    at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:276)
    at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:253)
    at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:162)
    at java.rmi.server.RemoteObjectInvocationHandler.invokeRemoteMethod(RemoteObjectInvocationHandler.java:227)
    at java.rmi.server.RemoteObjectInvocationHandler.invoke(RemoteObjectInvocationHandler.java:179)
    at com.sun.proxy.$Proxy137.updateIndex(Unknown Source)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at com.intellij.execution.rmi.RemoteUtil.invokeRemote(RemoteUtil.java:175)
    at com.intellij.execution.rmi.RemoteUtil.access$300(RemoteUtil.java:36)
    at com.intellij.execution.rmi.RemoteUtil$2$1$1.compute(RemoteUtil.java:156)
    at com.intellij.execution.rmi.RemoteUtil.executeWithClassLoader(RemoteUtil.java:232)
    at com.intellij.execution.rmi.RemoteUtil$2$1.invoke(RemoteUtil.java:153)
    at com.sun.proxy.$Proxy137.updateIndex(Unknown Source)
    at org.jetbrains.idea.maven.server.MavenIndexerWrapper$3.execute(MavenIndexerWrapper.java:120)
    at org.jetbrains.idea.maven.server.RemoteObjectWrapper.perform(RemoteObjectWrapper.java:118)
    at org.jetbrains.idea.maven.server.MavenIndexerWrapper.updateIndex(MavenIndexerWrapper.java:115)
    at org.jetbrains.idea.maven.indices.MavenIndex.updateContext(MavenIndex.java:371)
    at org.jetbrains.idea.maven.indices.MavenIndex.updateOrRepair(MavenIndex.java:329)
    at org.jetbrains.idea.maven.indices.MavenIndices.updateOrRepair(MavenIndices.java:128)
    at org.jetbrains.idea.maven.indices.MavenIndicesManager.doUpdateIndices(MavenIndicesManager.java:276)
    at org.jetbrains.idea.maven.indices.MavenIndicesManager.access$200(MavenIndicesManager.java:52)
    at org.jetbrains.idea.maven.indices.MavenIndicesManager$3.run(MavenIndicesManager.java:243)
    at com.intellij.openapi.progress.impl.CoreProgressManager$TaskRunnable.run(CoreProgressManager.java:718)
    at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$runProcess$1(CoreProgressManager.java:170)
    at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:548)
    at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:493)
    at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:94)
    at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:157)
    at com.intellij.openapi.progress.impl.ProgressManagerImpl$2.run(ProgressManagerImpl.java:165)
    at com.intellij.openapi.application.impl.ApplicationImpl$2.run(ApplicationImpl.java:343)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.rmi.ConnectException: Connection refused to host: localhost; nested exception is: 
    java.net.ConnectException: Connection refused (Connection refused)
    at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:619)
    at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:216)
    at sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:202)
    at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:130)
    at java.rmi.server.RemoteObjectInvocationHandler.invokeRemoteMethod(RemoteObjectInvocationHandler.java:227)
    at java.rmi.server.RemoteObjectInvocationHandler.invoke(RemoteObjectInvocationHandler.java:179)
    at com.sun.proxy.$Proxy29.setIndeterminate(Unknown Source)
    at org.jetbrains.idea.maven.server.Maven3ServerIndexerImpl.updateIndex(Maven3ServerIndexerImpl.java:152)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:346)
    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$0(TCPTransport.java:683)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.rmi.transport.tcp.TCPTransport$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:748)
Caused by: java.net.ConnectException: Connection refused (Connection refused)
    at java.net.PlainSocketImpl.socketConnect(Native Method)
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
    at java.net.Socket.connect(Socket.java:589)
    at java.net.Socket.connect(Socket.java:538)
    at java.net.Socket.<init>(Socket.java:434)
    at java.net.Socket.<init>(Socket.java:211)
    at sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(RMIDirectSocketFactory.java:40)
    at sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(RMIMasterSocketFactory.java:148)
    at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:613)
    ... 24 more
2017-08-29 13:17:07,836 [12188702]   WARN - ution.rmi.RemoteProcessSupport - java.rmi.ConnectException: Connection refused to host: localhost; nested exception is: 
2017-08-29 13:17:07,841 [12188707]   WARN - ution.rmi.RemoteProcessSupport - java.net.ConnectException: Connection refused (Connection refused) 
2017-08-29 13:17:07,841 [12188707]   WARN - ution.rmi.RemoteProcessSupport - at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:619) 
2017-08-29 13:17:07,841 [12188707]   WARN - ution.rmi.RemoteProcessSupport - at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:216) 
2017-08-29 13:17:07,841 [12188707]   WARN - ution.rmi.RemoteProcessSupport - at sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:202) 
2017-08-29 13:17:07,841 [12188707]   WARN - ution.rmi.RemoteProcessSupport - at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:130) 
2017-08-29 13:17:07,841 [12188707]   WARN - ution.rmi.RemoteProcessSupport - at java.rmi.server.RemoteObjectInvocationHandler.invokeRemoteMethod(RemoteObjectInvocationHandler.java:227) 
2017-08-29 13:17:07,841 [12188707]   WARN - ution.rmi.RemoteProcessSupport - at java.rmi.server.RemoteObjectInvocationHandler.invoke(RemoteObjectInvocationHandler.java:179) 
2017-08-29 13:17:07,841 [12188707]   WARN - ution.rmi.RemoteProcessSupport - at com.sun.proxy.$Proxy1.ping(Unknown Source) 
2017-08-29 13:17:07,841 [12188707]   WARN - ution.rmi.RemoteProcessSupport - at com.intellij.execution.rmi.RemoteServer.start(RemoteServer.java:83) 
2017-08-29 13:17:07,841 [12188707]   WARN - ution.rmi.RemoteProcessSupport - at org.jetbrains.idea.maven.server.RemoteMavenServer.main(RemoteMavenServer.java:22) 
2017-08-29 13:17:07,841 [12188707]   WARN - ution.rmi.RemoteProcessSupport - Caused by: java.net.ConnectException: Connection refused (Connection refused) 
2017-08-29 13:17:07,841 [12188707]   WARN - ution.rmi.RemoteProcessSupport - at java.net.PlainSocketImpl.socketConnect(Native Method) 
2017-08-29 13:17:07,841 [12188707]   WARN - ution.rmi.RemoteProcessSupport - at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) 
2017-08-29 13:17:07,842 [12188708]   WARN - ution.rmi.RemoteProcessSupport - at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) 
2017-08-29 13:17:07,842 [12188708]   WARN - ution.rmi.RemoteProcessSupport - at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) 
2017-08-29 13:17:07,842 [12188708]   WARN - ution.rmi.RemoteProcessSupport - at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) 
2017-08-29 13:17:07,842 [12188708]   WARN - ution.rmi.RemoteProcessSupport - at java.net.Socket.connect(Socket.java:589) 
2017-08-29 13:17:07,842 [12188708]   WARN - ution.rmi.RemoteProcessSupport - at java.net.Socket.connect(Socket.java:538) 
2017-08-29 13:17:07,842 [12188708]   WARN - ution.rmi.RemoteProcessSupport - at java.net.Socket.<init>(Socket.java:434) 
2017-08-29 13:17:07,842 [12188708]   WARN - ution.rmi.RemoteProcessSupport - at java.net.Socket.<init>(Socket.java:211) 
2017-08-29 13:17:07,842 [12188708]   WARN - ution.rmi.RemoteProcessSupport - at sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(RMIDirectSocketFactory.java:40) 
2017-08-29 13:17:07,842 [12188708]   WARN - ution.rmi.RemoteProcessSupport - at sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(RMIMasterSocketFactory.java:148) 
2017-08-29 13:17:07,842 [12188708]   WARN - ution.rmi.RemoteProcessSupport - at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:613) 
2017-08-29 13:17:07,842 [12188708]   WARN - ution.rmi.RemoteProcessSupport - ... 8 more 
2017-08-29 13:17:21,180 [12202046]   INFO - .script.IdeScriptEngineManager - javax.script.ScriptEngineManager initialized in 34 ms 
2017-08-29 13:17:23,080 [12203946]   INFO - ij.compiler.impl.CompileDriver - COMPILATION STARTED (BUILD PROCESS) 
2017-08-29 13:17:23,756 [12204622]   INFO - j.compiler.server.BuildManager - BUILDER_PROCESS [stdout]: Build process started. Classpath: /Applications/IntelliJ IDEA CE.app/Contents/lib/jps-launcher.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home/lib/tools.jar:/Applications/IntelliJ IDEA CE.app/Contents/lib/optimizedFileManager.jar 
2017-08-29 13:17:23,859 [12204725]   INFO - j.compiler.server.BuildManager - BUILDER_PROCESS [stderr]: SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder". 
2017-08-29 13:17:23,860 [12204726]   INFO - j.compiler.server.BuildManager - BUILDER_PROCESS [stderr]: SLF4J: Defaulting to no-operation (NOP) logger implementation 
2017-08-29 13:17:23,860 [12204726]   INFO - j.compiler.server.BuildManager - BUILDER_PROCESS [stderr]: SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details. 
2017-08-29 13:17:27,244 [12208110]   INFO - pl.ProjectRootManagerComponent - project roots have changed 
2017-08-29 13:17:27,299 [12208165]   INFO - pl.ProjectRootManagerComponent - project roots have changed 
2017-08-29 13:17:27,305 [12208171]   INFO - .diagnostic.PerformanceWatcher - Pushing properties took 0ms; general responsiveness: ok; EDT responsiveness: ok 
2017-08-29 13:17:27,324 [12208190]   INFO - indexing.UnindexedFilesUpdater - Unindexed files update canceled 
2017-08-29 13:17:27,325 [12208191]   INFO - pl.ProjectRootManagerComponent - project roots have changed 
2017-08-29 13:17:27,333 [12208199]   INFO - .diagnostic.PerformanceWatcher - Pushing properties took 2ms; general responsiveness: ok; EDT responsiveness: ok 
2017-08-29 13:17:27,336 [12208202]   INFO - lij.compiler.impl.CompilerUtil -    COMPILATION FINISHED (BUILD PROCESS); Errors: 100; warnings: 3 took 4150 ms: 0 min 4sec 
2017-08-29 13:17:27,365 [12208231]   INFO - s.CompilerReferenceServiceImpl - backward reference index reader is opened 
2017-08-29 13:17:27,369 [12208235]   INFO - .diagnostic.PerformanceWatcher - Indexable file iteration took 36ms; general responsiveness: ok; EDT responsiveness: ok 
2017-08-29 13:17:27,635 [12208501]   INFO - j.compiler.server.BuildManager - BUILDER_PROCESS [stdout]: Build process started. Classpath: /Applications/IntelliJ IDEA CE.app/Contents/lib/jps-launcher.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home/lib/tools.jar:/Applications/IntelliJ IDEA CE.app/Contents/lib/optimizedFileManager.jar 
2017-08-29 13:17:27,704 [12208570]   INFO - j.compiler.server.BuildManager - BUILDER_PROCESS [stderr]: SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder". 
2017-08-29 13:17:27,704 [12208570]   INFO - j.compiler.server.BuildManager - BUILDER_PROCESS [stderr]: SLF4J: Defaulting to no-operation (NOP) logger implementation 
2017-08-29 13:17:27,704 [12208570]   INFO - j.compiler.server.BuildManager - BUILDER_PROCESS [stderr]: SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.

Update

Which settings.xml are you using?

/Users/donato/.m2/settings.xml

Does this happen with any Maven project you open in IntelliJ or just this one?

This occurs with all maven projects

Also, apart from Intellij showing indexing failure, does your build work if invoked from the Maven panel?

Build fails, stating that a lot of symbols cannot be found.

Donato Perconti :

Finally figured out the issue. There was an invalid character in my /etc/hosts file which was preventing any connection to localhost. This was discovered when I entered the following command: