GsonFormat插件使用报错 String index out of range -1_gsonformat报错

错误

使用GsonFormat插件将GSON格式的字符串转换成Java实体类失败，报错如下：

错误日志

java.lang.RuntimeException: java.lang.StringIndexOutOfBoundsException: String index out of range: -1
	at com.intellij.openapi.application.TransactionGuardImpl.submitTransactionAndWait(TransactionGuardImpl.java:176)
	at com.intellij.openapi.command.WriteCommandAction.execute(WriteCommandAction.java:248)
	at org.gsonformat.intellij.action.DataWriter.execute(DataWriter.java:74)
	at org.gsonformat.intellij.action.DataWriter$1.run(DataWriter.java:54)
	at com.intellij.openapi.progress.impl.CoreProgressManager$TaskRunnable.run(CoreProgressManager.java:727)
	at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$runProcess$2(CoreProgressManager.java:164)
	at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:582)
	at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:532)
	at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:87)
	at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:151)
	at com.intellij.openapi.progress.impl.CoreProgressManager$4.run(CoreProgressManager.java:403)
	at com.intellij.openapi.application.impl.ApplicationImpl$1.run(ApplicationImpl.java:314)
	at java.util.concurrent.Executors$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$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.StringIndexOutOfBoundsException: String index out of range: -1
	at java.lang.String.substring(String.java:1967)
	at org.gsonformat.intellij.common.PsiClassUtil.getPackage(PsiClassUtil.java:160)
	at org.gsonformat.intellij.process.Processor.process(Processor.java:44)
	at org.gsonformat.intellij.process.ClassProcessor.generate(ClassProcessor.java:24)
	at org.gsonformat.intellij.action.DataWriter.run(DataWriter.java:83)
	at com.intellij.openapi.command.WriteCommandAction$Simple.run(WriteCommandAction.java:348)
	at com.intellij.openapi.application.RunResult.run(RunResult.java:35)
	at com.intellij.openapi.command.WriteCommandAction.lambda$null$1(WriteCommandAction.java:264)
	at com.intellij.openapi.application.impl.ApplicationImpl.runWriteAction(ApplicationImpl.java:1057)
	at com.intellij.openapi.command.WriteCommandAction.lambda$performWriteCommandAction$2(WriteCommandAction.java:263)
	at com.intellij.openapi.command.WriteCommandAction.lambda$doExecuteCommand$4(WriteCommandAction.java:321)
	at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:220)
	at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:188)
	at com.intellij.openapi.command.WriteCommandAction.doExecuteCommand(WriteCommandAction.java:323)
	at com.intellij.openapi.command.WriteCommandAction.performWriteCommandAction(WriteCommandAction.java:262)
	at com.intellij.openapi.command.WriteCommandAction.lambda$execute$0(WriteCommandAction.java:248)
	at com.intellij.openapi.application.TransactionGuardImpl.lambda$submitTransactionAndWait$2(TransactionGuardImpl.java:165)
	at com.intellij.openapi.application.TransactionGuardImpl.runSyncTransaction(TransactionGuardImpl.java:88)
	at com.intellij.openapi.application.TransactionGuardImpl.lambda$submitTransaction$1(TransactionGuardImpl.java:111)
	at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.doRun(LaterInvocator.java:435)
	at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.runNextEvent(LaterInvocator.java:419)
	at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.run(LaterInvocator.java:403)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:762)
	at java.awt.EventQueue.access$500(EventQueue.java:98)
	at java.awt.EventQueue$3.run(EventQueue.java:715)
	at java.awt.EventQueue$3.run(EventQueue.java:709)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:732)
	at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:719)
	at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:668)
	at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:363)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

原因

需要转换成的实体类文件是在IDEA项目的默认文件目录下。

解决

在原来IDEA默认目录下创建一个来放实体类的包。

例如：创建一个bean目录，并在其目录下创建一个User实体类。

再次使用GsonFormat插件转换实体类。