Maven - exception during project building

Question

When I'm trying to build project I get exception:

Downloading: http://repo.maven.apache.org/maven2/log4j/log4j/1.2.14/log4j-1.2.14.jar Nov 4, 2012 5:47:16 PM org.apache.maven.wagon.providers.http.httpclient.impl.client.DefaultRequestDirector tryExecute INFO: I/O exception (java.net.SocketException) caught when processing request: Connection reset Nov 4, 2012 5:47:16 PM org.apache.maven.wagon.providers.http.httpclient.impl.client.DefaultRequestDirector tryExecute INFO: Retrying request Nov 4, 2012 5:48:16 PM org.apache.maven.wagon.providers.http.httpclient.impl.client.DefaultRequestDirector tryExecute INFO: I/O exception (java.net.SocketException) caught when processing request: Connection reset Nov 4, 2012 5:48:16 PM org.apache.maven.wagon.providers.http.httpclient.impl.client.DefaultRequestDirector tryExecute INFO: Retrying request Nov 4, 2012 5:49:17 PM org.apache.maven.wagon.providers.http.httpclient.impl.client.DefaultRequestDirector tryExecute INFO: I/O exception (java.net.SocketException) caught when processing request: Connection reset Nov 4, 2012 5:49:17 PM org.apache.maven.wagon.providers.http.httpclient.impl.client.DefaultRequestDirector tryExecute INFO: Retrying request [DEBUG] Writing resolution tracking file /root/.m2/repository/log4j/log4j/1.2.14/log4j-1.2.14.jar.lastUpdated [INFO] ------------------------------------------------------------------------ [INFO] BUILD FAILURE [INFO] ------------------------------------------------------------------------ [INFO] Total time: 4:03.016s [INFO] Finished at: Sun Nov 04 17:50:17 CET 2012 [INFO] Final Memory: 5M/15M [INFO] ------------------------------------------------------------------------ [ERROR] Failed to execute goal on project jboss-ejb3-examples-ch04-firstejb: Could not resolve dependencies for project org.jboss.ejb3.examples:jboss-ejb3-examples-ch04-firstejb:jar:1.0.0-cr-1: Could not transfer artifact log4j:log4j:jar:1.2.14 from/to central (http://repo.maven.apache.org/maven2): Connection reset -> [Help 1] org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal on project jboss-ejb3-examples-ch04-firstejb: Could not resolve dependencies for project org.jboss.ejb3.examples:jboss-ejb3-examples-ch04-firstejb:jar:1.0.0-cr-1: Could not transfer artifact log4j:log4j:jar:1.2.14 from/to central (http://repo.maven.apache.org/maven2): Connection reset at org.apache.maven.lifecycle.internal.LifecycleDependencyResolver.getDependencies(LifecycleDependencyResolver.java:210) at org.apache.maven.lifecycle.internal.LifecycleDependencyResolver.resolveProjectDependencies(LifecycleDependencyResolver.java:117) at org.apache.maven.lifecycle.internal.MojoExecutor.ensureDependenciesAreResolved(MojoExecutor.java:258) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:201) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145) at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84) at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59) at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183) at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161) at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:320) at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156) at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537) at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196) at org.apache.maven.cli.MavenCli.main(MavenCli.java:141) 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.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290) at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230) at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409) at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352) Caused by: org.apache.maven.project.DependencyResolutionException: Could not resolve dependencies for project org.jboss.ejb3.examples:jboss-ejb3-examples-ch04-firstejb:jar:1.0.0-cr-1: Could not transfer artifact log4j:log4j:jar:1.2.14 from/to central (http://repo.maven.apache.org/maven2): Connection reset at org.apache.maven.project.DefaultProjectDependenciesResolver.resolve(DefaultProjectDependenciesResolver.java:189) at org.apache.maven.lifecycle.internal.LifecycleDependencyResolver.getDependencies(LifecycleDependencyResolver.java:185) ... 22 more Caused by: org.sonatype.aether.resolution.DependencyResolutionException: Could not transfer artifact log4j:log4j:jar:1.2.14 from/to central (http://repo.maven.apache.org/maven2): Connection reset at org.sonatype.aether.impl.internal.DefaultRepositorySystem.resolveDependencies(DefaultRepositorySystem.java:375) at org.apache.maven.project.DefaultProjectDependenciesResolver.resolve(DefaultProjectDependenciesResolver.java:183) ... 23 more Caused by: org.sonatype.aether.resolution.ArtifactResolutionException: Could not transfer artifact log4j:log4j:jar:1.2.14 from/to central (http://repo.maven.apache.org/maven2): Connection reset at org.sonatype.aether.impl.internal.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:538) at org.sonatype.aether.impl.internal.DefaultArtifactResolver.resolveArtifacts(DefaultArtifactResolver.java:216) at org.sonatype.aether.impl.internal.DefaultRepositorySystem.resolveDependencies(DefaultRepositorySystem.java:358) ... 24 more Caused by: org.sonatype.aether.transfer.ArtifactTransferException: Could not transfer artifact log4j:log4j:jar:1.2.14 from/to central (http://repo.maven.apache.org/maven2): Connection reset at org.sonatype.aether.connector.wagon.WagonRepositoryConnector$4.wrap(WagonRepositoryConnector.java:951) at org.sonatype.aether.connector.wagon.WagonRepositoryConnector$4.wrap(WagonRepositoryConnector.java:939) at org.sonatype.aether.connector.wagon.WagonRepositoryConnector$GetTask.run(WagonRepositoryConnector.java:669) at org.sonatype.aether.util.concurrency.RunnableErrorForwarder$1.run(RunnableErrorForwarder.java:60) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:662) Caused by: org.apache.maven.wagon.TransferFailedException: Connection reset at org.apache.maven.wagon.shared.http4.AbstractHttpClientWagon.fillInputData(AbstractHttpClientWagon.java:799) at org.apache.maven.wagon.StreamWagon.getInputStream(StreamWagon.java:116) at org.apache.maven.wagon.StreamWagon.getIfNewer(StreamWagon.java:88) at org.apache.maven.wagon.StreamWagon.get(StreamWagon.java:61) at org.sonatype.aether.connector.wagon.WagonRepositoryConnector$GetTask.run(WagonRepositoryConnector.java:601) ... 4 more Caused by: java.net.SocketException: Connection reset at java.net.SocketInputStream.read(SocketInputStream.java:168) at org.apache.maven.wagon.providers.http.httpclient.impl.io.AbstractSessionInputBuffer.fillBuffer(AbstractSessionInputBuffer.java:149) at org.apache.maven.wagon.providers.http.httpclient.impl.io.SocketInputBuffer.fillBuffer(SocketInputBuffer.java:111) at org.apache.maven.wagon.providers.http.httpclient.impl.io.AbstractSessionInputBuffer.readLine(AbstractSessionInputBuffer.java:264) at org.apache.maven.wagon.providers.http.httpclient.impl.conn.DefaultResponseParser.parseHead(DefaultResponseParser.java:98) at org.apache.maven.wagon.providers.http.httpclient.impl.io.AbstractMessageParser.parse(AbstractMessageParser.java:252) at org.apache.maven.wagon.providers.http.httpclient.impl.AbstractHttpClientConnection.receiveResponseHeader(AbstractHttpClientConnection.java:282) at org.apache.maven.wagon.providers.http.httpclient.impl.conn.DefaultClientConnection.receiveResponseHeader(DefaultClientConnection.java:247) at org.apache.maven.wagon.providers.http.httpclient.impl.conn.AbstractClientConnAdapter.receiveResponseHeader(AbstractClientConnAdapter.java:219) at org.apache.maven.wagon.providers.http.httpclient.protocol.HttpRequestExecutor.doReceiveResponse(HttpRequestExecutor.java:298) at org.apache.maven.wagon.providers.http.httpclient.protocol.HttpRequestExecutor.execute(HttpRequestExecutor.java:125) at org.apache.maven.wagon.providers.http.httpclient.impl.client.DefaultRequestDirector.tryExecute(DefaultRequestDirector.java:633) at org.apache.maven.wagon.providers.http.httpclient.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:454) at org.apache.maven.wagon.providers.http.httpclient.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:820) at org.apache.maven.wagon.providers.http.httpclient.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:754) at org.apache.maven.wagon.shared.http4.AbstractHttpClientWagon.execute(AbstractHttpClientWagon.java:674) at org.apache.maven.wagon.shared.http4.AbstractHttpClientWagon.fillInputData(AbstractHttpClientWagon.java:793) ... 8 more [ERROR] [ERROR] [ERROR] For more information about the errors and possible solutions, please read the following articles: [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/DependencyResolutionException

What is the problem? I think pom and other things are ok as it is example from book, so it should build.

Answer 1

Buried in there you'll see:

http://repo.maven.apache.org/maven2: Connection reset

You have a network problem. Maybe you're on wifi and getting interference... who knows.