使用mybastis-plus code generator 生成后报错

Question

老师好，这里使用mybatis-plus code generator 插件生成代码的时候报错了：

1. 本地链接成功
2. 
3. 代码也生成了，但是报错了：

/**
 * <p>
 * 
 * </p>
 *
 * @author FreeMarker template error (DEBUG mode; use RETHROW in production!):
The following has evaluated to null or missing:
==> author  [in template "templates/entity.java.ftl" at line 21, column 14]

----
Tip: If the failing expression is known to legally refer to something that's sometimes null or missing, either specify a default value like myOptionalVar!myDefault, or use <#if myOptionalVar??>when-present<#else>when-missing</#if>. (These only cover the last step of the expression; to cover the whole expression, use parenthesis: (myOptionalVar.foo)!myDefault, (myOptionalVar.foo)??
----

----
FTL stack trace ("~" means nesting-related):
	- Failed at: ${author}  [in template "templates/entity.java.ftl" at line 21, column 12]
----

Java stack trace (for programmers):
----
freemarker.core.InvalidReferenceException: [... Exception message was already printed; see it above ...]
	at freemarker.core.InvalidReferenceException.getInstance(InvalidReferenceException.java:134)
	at freemarker.core.EvalUtil.coerceModelToTextualCommon(EvalUtil.java:467)
	at freemarker.core.EvalUtil.coerceModelToStringOrMarkup(EvalUtil.java:389)
	at freemarker.core.EvalUtil.coerceModelToStringOrMarkup(EvalUtil.java:358)
	at freemarker.core.DollarVariable.calculateInterpolatedStringOrMarkup(DollarVariable.java:100)
	at freemarker.core.DollarVariable.accept(DollarVariable.java:63)
	at freemarker.core.Environment.visit(Environment.java:330)
	at freemarker.core.Environment.visit(Environment.java:336)
	at freemarker.core.Environment.process(Environment.java:309)
	at freemarker.template.Template.process(Template.java:384)
	at com.baomidou.mybatisplus.generator.engine.FreemarkerTemplateEngine.writer(FreemarkerTemplateEngine.java:52)
	at com.baomidou.mybatisplus.generator.engine.AbstractTemplateEngine.batchOutput(AbstractTemplateEngine.java:91)
	at com.baomidou.mybatisplus.generator.AutoGenerator.execute(AutoGenerator.java:103)
	at com.dragon.idea.generator.service.CodeGeneratorService.generator(CodeGeneratorService.java:118)
	at com.dragon.idea.generator.action.CodeGenerateDialogAction.actionPerformed(CodeGenerateDialogAction.java:25)
	at com.intellij.openapi.actionSystem.ex.ActionUtil.lambda$performActionDumbAwareWithCallbacks$4(ActionUtil.java:240)
	at com.intellij.openapi.actionSystem.ex.ActionUtil.performDumbAwareWithCallbacks(ActionUtil.java:261)
	at com.intellij.openapi.actionSystem.ex.ActionUtil.performActionDumbAwareWithCallbacks(ActionUtil.java:240)
	at com.intellij.openapi.actionSystem.impl.ActionMenuItem$ActionTransmitter.lambda$performAction$0(ActionMenuItem.java:277)
	at com.intellij.openapi.wm.impl.FocusManagerImpl.runOnOwnContext(FocusManagerImpl.java:236)
	at com.intellij.openapi.wm.impl.IdeFocusManagerImpl.runOnOwnContext(IdeFocusManagerImpl.java:67)
	at com.intellij.openapi.actionSystem.impl.ActionMenuItem$ActionTransmitter.performAction(ActionMenuItem.java:269)
	at com.intellij.openapi.actionSystem.impl.ActionMenuItem.lambda$new$0(ActionMenuItem.java:81)
	at com.intellij.openapi.application.TransactionGuardImpl.runWithWritingAllowed(TransactionGuardImpl.java:214)
	at com.intellij.openapi.application.TransactionGuardImpl.access$200(TransactionGuardImpl.java:21)
	at com.intellij.openapi.application.TransactionGuardImpl$2.run(TransactionGuardImpl.java:196)
	at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:794)
	at com.intellij.openapi.application.impl.ApplicationImpl.lambda$invokeLater$4(ApplicationImpl.java:350)
	at com.intellij.openapi.application.impl.FlushQueue.doRun(FlushQueue.java:84)
	at com.intellij.openapi.application.impl.FlushQueue.runNextEvent(FlushQueue.java:133)
	at com.intellij.openapi.application.impl.FlushQueue.flushNow(FlushQueue.java:46)
	at com.intellij.openapi.application.impl.FlushQueue$FlushNow.run(FlushQueue.java:189)
	at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:313)
	at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:776)
	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.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:746)
	at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:885)
	at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:754)
	at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$6(IdeEventQueue.java:441)
	at com.intellij.openapi.progress.impl.CoreProgressManager.computePrioritized(CoreProgressManager.java:825)
	at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$7(IdeEventQueue.java:440)
	at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:794)
	at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:486)
	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)

请问该如何处理哈

Answer 1

Tim老师 2024-02-21 20:34:36

看你这里错误是@author这个注释为空，导致freemarker解释失败，这个插件我看了一下源码，是通过System.getenv().get("USERNAME")来获取的，也就是说获取的是当前操作系统的用户环境变量，你看看你是不是获取不到这个值。看看是你的电脑做了什么限制吗

• 提问者 慕盖茨0002275 #1

  我应该没有做什么操作把，我用的是苹果电脑 Big Sur 11.7.9，我用System.getenv().get("USERNAME")，确实啥也没有输出, 请问应该怎么设置好一点？我用ENV输出了对应的值，可以看到有USER，有LOGNAME，就是没有USERNAME，请问应该要怎么设置呢？试了System.put()一直报错

• Tim老师 回复 提问者 慕盖茨0002275 #2

  mac最近两年用的比较少了，我估计可能是mac上用户不叫USERNAME，所以拿不到。你在环境变量里面export USERNAME="XXX"试一下。如果实在不行，我建议你不要纠结了，这个生成代码插件不是唯一的，也不是咱们的重点，你可以找找类似的插件也有很多，搜索一下MAC下面支持的自动代码生成插件，找一个有用的就好了

• 提问者 慕盖茨0002275 回复 Tim老师 #3

  嗯嗯，我已经各种设置系统变量，也可以输出System.getenv().get("USERNAME")的值了，系统里面使用ENV也可以正常输出“USERNAME”的信息了，但是用插件生成代码还是不行。然后重启电脑，重启idea后，重启插件，还是不行，依然是报那个错误。我回头试试其他插件，谢谢Time老师！

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