I wanted to make a multi-pom project in Intellij (2020.3.4). In one Maven project, I right-click ->New -> Module -> Maven. select parent to "my project". However, even if parent is not specified, I get the error: Error adding module to project: null. (at the same time, it adds a regular folder with the module name and an empty pom.xml inside) (This happens with any archetype). I didn't find any solutions on the Internet at all. Only downgrade to the old version of Intellij IDEA and that solution was published 10 years ago. Tell me what is the problem? Or what to do? Does not work only with "Maven". With "Java" and "Spring Inizializr" it works.
idea.log
2022-03-23 15:54:05,382 [81624884] WARN - il.projectWizard.ModuleBuilder -
java.lang.NullPointerException
at java.base/java.util.concurrent.ConcurrentHashMap.putVal(ConcurrentHashMap.java:1011)
at java.base/java.util.concurrent.ConcurrentHashMap.put(ConcurrentHashMap.java:1006)
at java.base/java.util.Properties.put(Properties.java:1340)
at java.base/java.util.Properties.setProperty(Properties.java:228)
at org.jetbrains.idea.maven.utils.MavenUtil.runOrApplyMavenProjectFileTemplate(MavenUtil.java:384)
at org.jetbrains.idea.maven.utils.MavenUtil.runOrApplyMavenProjectFileTemplate(MavenUtil.java:341)
at org.jetbrains.idea.maven.wizards.MavenModuleBuilderHelper.lambda$configure$0(MavenModuleBuilderHelper.java:85)
at com.intellij.openapi.command.WriteCommandAction$BuilderImpl$2.run(WriteCommandAction.java:122)
at com.intellij.openapi.application.RunResult.run(RunResult.java:35)
at com.intellij.openapi.command.WriteCommandAction.lambda$performWriteCommandAction$1(WriteCommandAction.java:253)
at com.intellij.openapi.application.impl.ApplicationImpl.runWriteAction(ApplicationImpl.java:1000)
at com.intellij.openapi.command.WriteCommandAction.lambda$performWriteCommandAction$2(WriteCommandAction.java:252)
at com.intellij.openapi.command.WriteCommandAction.lambda$doExecuteCommand$4(WriteCommandAction.java:310)
at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:220)
at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:187)
at com.intellij.openapi.command.WriteCommandAction.doExecuteCommand(WriteCommandAction.java:312)
at com.intellij.openapi.command.WriteCommandAction.performWriteCommandAction(WriteCommandAction.java:251)
at com.intellij.openapi.command.WriteCommandAction.execute(WriteCommandAction.java:232)
at com.intellij.openapi.command.WriteCommandAction$BuilderImpl.compute(WriteCommandAction.java:124)
at org.jetbrains.idea.maven.wizards.MavenModuleBuilderHelper.configure(MavenModuleBuilderHelper.java:79)
at org.jetbrains.idea.maven.wizards.AbstractMavenModuleBuilder.lambda$setupRootModel$0(AbstractMavenModuleBuilder.java:77)
at org.jetbrains.idea.maven.utils.MavenUtil.runDumbAware(MavenUtil.java:211)
at org.jetbrains.idea.maven.utils.MavenUtil.runWhenInitialized(MavenUtil.java:231)
at org.jetbrains.idea.maven.wizards.AbstractMavenModuleBuilder.setupRootModel(AbstractMavenModuleBuilder.java:70)
at com.intellij.ide.util.projectWizard.ModuleBuilder.setupModule(ModuleBuilder.java:260)
at com.intellij.ide.util.projectWizard.ModuleBuilder.createModule(ModuleBuilder.java:253)
at com.intellij.ide.util.projectWizard.ModuleBuilder.createAndCommitIfNeeded(ModuleBuilder.java:292)
at com.intellij.ide.util.projectWizard.ModuleBuilder.lambda$commitModule$4(ModuleBuilder.java:338)
at com.intellij.openapi.application.impl.ApplicationImpl.runWriteActionWithClass(ApplicationImpl.java:988)
at com.intellij.openapi.application.impl.ApplicationImpl.runWriteAction(ApplicationImpl.java:1014)
at com.intellij.ide.util.projectWizard.ModuleBuilder.commitModule(ModuleBuilder.java:337)
at com.intellij.openapi.roots.ui.configuration.actions.NewModuleAction.createModuleFromWizard(NewModuleAction.java:59)
at com.intellij.openapi.roots.ui.configuration.actions.NewModuleAction.actionPerformed(NewModuleAction.java:49)
at com.intellij.openapi.actionSystem.ex.ActionUtil.performActionDumbAware(ActionUtil.java:281)
at com.intellij.openapi.actionSystem.impl.ActionMenuItem$ActionTransmitter.lambda$actionPerformed$0(ActionMenuItem.java:310)
at com.intellij.openapi.wm.impl.FocusManagerImpl.runOnOwnContext(FocusManagerImpl.java:286)
at com.intellij.openapi.wm.impl.IdeFocusManagerImpl.runOnOwnContext(IdeFocusManagerImpl.java:77)
at com.intellij.openapi.actionSystem.impl.ActionMenuItem$ActionTransmitter.actionPerformed(ActionMenuItem.java:299)
at java.desktop/javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1967)
at com.intellij.openapi.actionSystem.impl.ActionMenuItem.lambda$fireActionPerformed$0(ActionMenuItem.java:110)
at com.intellij.openapi.application.TransactionGuardImpl.performUserActivity(TransactionGuardImpl.java:95)
at com.intellij.openapi.actionSystem.impl.ActionMenuItem.fireActionPerformed(ActionMenuItem.java:110)
at com.intellij.ui.plaf.beg.BegMenuItemUI.doClick(BegMenuItemUI.java:514)
at com.intellij.ui.plaf.beg.BegMenuItemUI$MyMouseInputHandler.mouseReleased(BegMenuItemUI.java:544)
at java.desktop/java.awt.Component.processMouseEvent(Component.java:6652)
at java.desktop/javax.swing.JComponent.processMouseEvent(JComponent.java:3345)
at java.desktop/java.awt.Component.processEvent(Component.java:6417)
at java.desktop/java.awt.Container.processEvent(Container.java:2263)
at java.desktop/java.awt.Component.dispatchEventImpl(Component.java:5027)
at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2321)
at java.desktop/java.awt.Component.dispatchEvent(Component.java:4859)
at java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4918)
at java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Container.java:4547)
at java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Container.java:4488)
at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2307)
at java.desktop/java.awt.Window.dispatchEventImpl(Window.java:2780)
at java.desktop/java.awt.Component.dispatchEvent(Component.java:4859)
at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:778)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:727)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:95)
at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:751)
at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:749)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:748)
at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:976)
at com.intellij.ide.IdeEventQueue.dispatchMouseEvent(IdeEventQueue.java:911)
at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:840)
at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$8(IdeEventQueue.java:454)
at com.intellij.openapi.progress.impl.CoreProgressManager.computePrioritized(CoreProgressManager.java:773)
at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$9(IdeEventQueue.java:453)
at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:822)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:507)
at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
2022-03-23 15:54:05,981 [81625483] ERROR - plication.impl.ApplicationImpl - Cannot reconnect.
java.lang.RuntimeException: Cannot reconnect.
at org.jetbrains.idea.maven.server.RemoteObjectWrapper.perform(RemoteObjectWrapper.java:82)
at org.jetbrains.idea.maven.server.MavenIndexerWrapper.getArchetypes(MavenIndexerWrapper.java:143)
at org.jetbrains.idea.maven.indices.MavenIndicesManager.getArchetypes(MavenIndicesManager.java:337)
at org.jetbrains.idea.maven.wizards.MavenArchetypesStep.lambda$updateArchetypesList$3(MavenArchetypesStep.java:223)
at com.intellij.util.RunnableCallable.call(RunnableCallable.java:20)
at com.intellij.util.RunnableCallable.call(RunnableCallable.java:11)
at com.intellij.openapi.application.impl.ApplicationImpl$1.call(ApplicationImpl.java:270)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:668)
at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:665)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1.run(Executors.java:665)
at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.rmi.ConnectException: Connection refused to host: 127.0.0.1; nested exception is:
java.net.ConnectException: Connection refused: connect
at java.rmi/sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:623)
at java.rmi/sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:209)
at java.rmi/sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:196)
at java.rmi/sun.rmi.server.UnicastRef.invoke(UnicastRef.java:132)
at java.rmi/java.rmi.server.RemoteObjectInvocationHandler.invokeRemoteMethod(RemoteObjectInvocationHandler.java:217)
at java.rmi/java.rmi.server.RemoteObjectInvocationHandler.invoke(RemoteObjectInvocationHandler.java:162)
at com.sun.proxy.$Proxy146.createIndexer(Unknown Source)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at com.intellij.execution.rmi.RemoteUtil.invokeRemote(RemoteUtil.java:150)
at com.intellij.execution.rmi.RemoteUtil.access$400(RemoteUtil.java:21)
at com.intellij.execution.rmi.RemoteUtil$1.lambda$invoke$0(RemoteUtil.java:134)
at com.intellij.openapi.util.ClassLoaderUtil.computeWithClassLoader(ClassLoaderUtil.java:31)
at com.intellij.execution.rmi.RemoteUtil.executeWithClassLoader(RemoteUtil.java:202)
at com.intellij.execution.rmi.RemoteUtil$1.invoke(RemoteUtil.java:134)
at com.sun.proxy.$Proxy146.createIndexer(Unknown Source)
at org.jetbrains.idea.maven.server.MavenServerConnectorImpl.createIndexer(MavenServerConnectorImpl.java:197)
at org.jetbrains.idea.maven.server.MavenServerManager$4.create(MavenServerManager.java:381)
at org.jetbrains.idea.maven.server.MavenServerManager$4.create(MavenServerManager.java:377)
at org.jetbrains.idea.maven.server.RemoteObjectWrapper.getOrCreateWrappee(RemoteObjectWrapper.java:41)
at org.jetbrains.idea.maven.server.MavenIndexerWrapper.lambda$getArchetypes$6(MavenIndexerWrapper.java:143)
at org.jetbrains.idea.maven.server.RemoteObjectWrapper.perform(RemoteObjectWrapper.java:76)
... 14 more
Caused by: java.net.ConnectException: Connection refused: connect
at java.base/java.net.PlainSocketImpl.connect0(Native Method)
at java.base/java.net.PlainSocketImpl.socketConnect(PlainSocketImpl.java:101)
at java.base/java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:399)
at java.base/java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:242)
at java.base/java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:224)
at java.base/java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.base/java.net.Socket.connect(Socket.java:609)
at java.base/java.net.Socket.connect(Socket.java:558)
at java.base/java.net.Socket.<init>(Socket.java:454)
at java.base/java.net.Socket.<init>(Socket.java:231)
at com.intellij.execution.rmi.RemoteServer$1.createSocket(RemoteServer.java:122)
at java.rmi/sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:617)
... 37 more
2022-03-23 15:54:05,981 [81625483] ERROR - plication.impl.ApplicationImpl - IntelliJ IDEA 2020.3.4 Build #IU-203.8084.24
2022-03-23 15:54:05,981 [81625483] ERROR - plication.impl.ApplicationImpl - JDK: 11.0.10; VM: OpenJDK 64-Bit Server VM; Vendor: JetBrains s.r.o.
2022-03-23 15:54:05,981 [81625483] ERROR - plication.impl.ApplicationImpl - OS: Windows 10
2022-03-23 15:54:05,981 [81625483] ERROR - plication.impl.ApplicationImpl - Last Action: NewModuleInGroup
2022-03-23 15:54:06,580 [81626082] INFO - .diagnostic.PerformanceWatcher - Indexable file iteration took 1922ms; general responsiveness: ok; EDT responsiveness: ok
2022-03-23 15:54:06,580 [81626082] INFO - indexing.UnindexedFilesUpdater - Unindexed files update started: 0 files to index
2022-03-23 15:54:06,580 [81626082] INFO - .diagnostic.PerformanceWatcher - Indexable file iteration took 1922ms; general responsiveness: ok; EDT responsiveness: ok
2022-03-23 15:54:06,595 [81626097] INFO - indexing.UnindexedFilesUpdater - Unindexed files update started: 0 files to index
2022-03-23 15:54:08,524 [81628026] INFO - rationStore.ComponentStoreImpl - Saving appFileTypeManager took 16 ms
CodePudding user response：
I reinstalled windows. (I needed it anyway) and installed intellij IDEA 2021.3 instead of 2020.3. Everything worked. Some of this has affected. Perhaps reinstalling the same version would also solve this problem.