1、今天在敲代码的时候，发现了一个bug：

Error:Internal error: (java.lang.IllegalAccessError) class com.intellij.util.io.FileChannelUtil (in unnamed module @0x3745e5c6) cannot access class sun.nio.ch.FileChannelImpl (in module java.base) because module java.base does not export sun.nio.ch to unnamed module @0x3745e5c6
java.lang.IllegalAccessError: class com.intellij.util.io.FileChannelUtil (in unnamed module @0x3745e5c6) cannot access class sun.nio.ch.FileChannelImpl (in module java.base) because module java.base does not export sun.nio.ch to unnamed module @0x3745e5c6
	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$500(PagedFileStorage.java:466)
	at com.intellij.util.io.PagedFileStorage.getBufferWrapper(PagedFileStorage.java:407)
	at com.intellij.util.io.PagedFileStorage.getBuffer(PagedFileStorage.java:371)
	at com.intellij.util.io.PagedFileStorage.putInt(PagedFileStorage.java:144)
	at com.intellij.util.io.ResizeableMappedFile.putInt(ResizeableMappedFile.java:222)
	at com.intellij.util.io.PersistentEnumeratorBase.markDirty(PersistentEnumeratorBase.java:597)
	at com.intellij.util.io.PersistentEnumeratorBase.<init>(PersistentEnumeratorBase.java:185)
	at com.intellij.util.io.PersistentBTreeEnumerator.<init>(PersistentBTreeEnumerator.java:73)
	at com.intellij.util.io.PersistentEnumeratorDelegate.<init>(PersistentEnumeratorDelegate.java:47)
	at com.intellij.util.io.PersistentHashMap.<init>(PersistentHashMap.java:149)
	at com.intellij.util.io.PersistentHashMap.<init>(PersistentHashMap.java:138)
	at com.intellij.util.io.PersistentHashMap.<init>(PersistentHashMap.java:129)
	at com.intellij.util.io.PersistentHashMap.<init>(PersistentHashMap.java:121)
	at com.intellij.util.io.PersistentHashMap.<init>(PersistentHashMap.java:114)
	at org.jetbrains.jps.incremental.storage.AbstractStateStorage.createMap(AbstractStateStorage.java:124)
	at org.jetbrains.jps.incremental.storage.AbstractStateStorage.<init>(AbstractStateStorage.java:27)
	at org.jetbrains.jps.incremental.storage.FileTimestampStorage.<init>(FileTimestampStorage.java:27)
	at org.jetbrains.jps.incremental.storage.ProjectStamps.<init>(ProjectStamps.java:39)
	at org.jetbrains.jps.incremental.storage.ProjectTimestamps.<init>(ProjectTimestamps.java:19)
	at org.jetbrains.jps.cmdline.BuildRunner.load(BuildRunner.java:92)
	at org.jetbrains.jps.cmdline.BuildSession.runBuild(BuildSession.java:274)
	at org.jetbrains.jps.cmdline.BuildSession.run(BuildSession.java:130)
	at org.jetbrains.jps.cmdline.BuildMain$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:842)

2、这里在参考大佬的文章，找到的答案是：idea2019不支持jdk17

错误:Internal error: (java.lang.IllegalAccessError) class com.intellij.util.io.FileChannelUtil (in unn_error:internal error: (java.lang.illegalaccesserro-CSDN博客

zoeil

2.1 可以cmd查看一下java -version的资料,那没办法，只好换一个java的版本！！！

2.2 现在我安装jdk的11版本，开始吧！！！安装完了，这里setting修改一下：

3、这里的JDK要调成11，

 4、经过调整，idea2019.3版本必须要用，Application2.7.6版本或者更低版本，具体可以参考这篇资料。

Error:java: 错误: 无效的源发行版：13， 类文件具有错误的版本 61.0, 应为 55.0 请删除该文件或确保该文件位于正确的类路径子目录中。-CSDN博客