After the Java project was converted from 8 to 17, an error occurred when running the project. There was no running process and an error was reported directly.
错误:Internal error: (java.lang.IllegalAccessError) class com.intellij.util.io.FileChannelUtil (in unnamed module @0x60611244) cannot access class sun.nio.ch.FileChannelImpl (in module java.base) because module java.base does not export sun.nio.ch to unnamed module @0x60611244
java.lang.IllegalAccessError: class com.intellij.util.io.FileChannelUtil (in unnamed module @0x60611244) cannot access class sun.nio.ch.FileChannelImpl (in module java.base) because module java.base does not export sun.nio.ch to unnamed module @0x60611244
at com.intellij.util.io.FileChannelUtil.setupUnInterruptibleHandle(FileChannelUtil.java:26)
at com.intellij.util.io.FileChannelUtil.<clinit>(FileChannelUtil.java:18)
at com.intellij.util.io.ReadWriteDirectBufferWrapper$FileContext$1.execute(ReadWriteDirectBufferWrapper.java:50)
at com.intellij.util.io.ReadWriteDirectBufferWrapper$FileContext$1.execute(ReadWriteDirectBufferWrapper.java:42)
at com.intellij.openapi.util.io.FileUtilRt.doIOOperation(FileUtilRt.java:945)
at com.intellij.util.io.ReadWriteDirectBufferWrapper$FileContext.<init>(ReadWriteDirectBufferWrapper.java:42)
at com.intellij.util.io.ReadWriteDirectBufferWrapper.create(ReadWriteDirectBufferWrapper.java:27)
at com.intellij.util.io.DirectBufferWrapper.getBuffer(DirectBufferWrapper.java:24)
at com.intellij.util.io.ReadWriteDirectBufferWrapper.getBuffer(ReadWriteDirectBufferWrapper.java:16)
at com.intellij.util.io.PagedFileStorage$StorageLock.createValue(PagedFileStorage.java:631)
at com.intellij.util.io.PagedFileStorage$StorageLock.get(PagedFileStorage.java:558)
at com.intellij.util.io.PagedFileStorage$StorageLock.access$500(PagedFileStorage.java:466)
at com.intellij.util.io.PagedFileStorage.getBufferWrapper(PagedFileStorage.java:407)
at com.intellij.util.io.PagedFileStorage.getReadOnlyBuffer(PagedFileStorage.java:375)
at com.intellij.util.io.PagedFileStorage.getInt(PagedFileStorage.java:155)
at com.intellij.util.io.ResizeableMappedFile.getInt(ResizeableMappedFile.java:217)
at com.intellij.util.io.PersistentEnumeratorBase.<init>(PersistentEnumeratorBase.java:212)
at com.intellij.util.io.PersistentBTreeEnumerator.<init>(PersistentBTreeEnumerator.java:73)
at com.intellij.util.io.PersistentEnumeratorDelegate.<init>(PersistentEnumeratorDelegate.java:47)
at com.intellij.util.io.PersistentHashMap.<init>(PersistentHashMap.java:149)
at com.intellij.util.io.PersistentHashMap.<init>(PersistentHashMap.java:138)
at com.intellij.util.io.PersistentHashMap.<init>(PersistentHashMap.java:129)
at com.intellij.util.io.PersistentHashMap.<init>(PersistentHashMap.java:121)
at com.intellij.util.io.PersistentHashMap.<init>(PersistentHashMap.java:114)
at org.jetbrains.jps.incremental.storage.AbstractStateStorage.createMap(AbstractStateStorage.java:124)
at org.jetbrains.jps.incremental.storage.AbstractStateStorage.<init>(AbstractStateStorage.java:27)
at org.jetbrains.jps.incremental.storage.FileTimestampStorage.<init>(FileTimestampStorage.java:27)
at org.jetbrains.jps.incremental.storage.ProjectStamps.<init>(ProjectStamps.java:39)
at org.jetbrains.jps.incremental.storage.ProjectTimestamps.<init>(ProjectTimestamps.java:19)
at org.jetbrains.jps.cmdline.BuildRunner.load(BuildRunner.java:92)
at org.jetbrains.jps.cmdline.BuildSession.runBuild(BuildSession.java:274)
at org.jetbrains.jps.cmdline.BuildSession.run(BuildSession.java:130)
at org.jetbrains.jps.cmdline.BuildMain$MyMessageHandler.lambda$channelRead0$0(BuildMain.java:232)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
at java.base/java.lang.Thread.run(Thread.java:833)
It was found that the issue was with the ideal version. ideal2019 does not support jdk17, so I uninstalled ideal and installed a new version.
Uninstall tutorial: Uninstall and reinstall idea_Uninstall clean idea and reinstall it_Jennifer33K's blog-CSDN blog
Installation tutorial: IDEA installation tutorial (foolish installation)_AiLi0617's blog-CSDN blog