mybatis-plus生成代码失败

本文介绍了一个关于Freemarker模板引擎在代码生成过程中遇到的错误案例,详细分析了错误产生的原因在于模板中引用了未定义或为空的变量,并给出了正确的解决办法。

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生成报错
FreeMarker template error:
The following has evaluated to null or missing:
==> table.comment [in template “templates/entity.java.ftl” at line 19, column 6]


Tip: It’s the step after the last dot that caused this error, not those before it.

Tip: If the failing expression is known to be 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: ${table.comment} [in template “templates/entity.java.ftl” at line 19, column 4]

Java stack trace (for programmers):

freemarker.core.InvalidReferenceException: [… Exception message was already printed; see it above …]
at freemarker.core.InvalidReferenceException.getInstance(InvalidReferenceException.java:131)
at freemarker.core.EvalUtil.coerceModelToString(EvalUtil.java:355)
at freemarker.core.Expression.evalAndCoerceToString(Expression.java:82)
at freemarker.core.DollarVariable.accept(DollarVariable.java:41)
at freemarker.core.Environment.visit(Environment.java:324)
at freemarker.core.MixedContent.accept(MixedContent.java:54)
at freemarker.core.Environment.visit(Environment.java:324)
at freemarker.core.Environment.process(Environment.java:302)
at freemarker.template.Template.process(Template.java:325)
at com.baomidou.mybatisplus.generator.engine.FreemarkerTemplateEngine.writer(FreemarkerTemplateEngine.java:55)
at com.baomidou.mybatisplus.generator.engine.AbstractTemplateEngine.batchOutput(AbstractTemplateEngine.java:99)
at com.baomidou.mybatisplus.generator.AutoGenerator.execute(AutoGenerator.java:99)
at com.kjtpay.groupprod.common.dal.generator.MpGenerator.main(MpGenerator.java:175)

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平常都是用这个模板进行生成,今天新加一个表,结果一直生成失败,最后整理发现原来是这个表没有取名字

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加上表名就可以了,这个真坑,搞了我一小时
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