我对Spring有一个奇怪的问题。我不认为我做错了什么，我怀疑这是Spring本身的问题，但我永远不能确定。在Internet上其他任何地方都找不到关于此错误的参考，因此我来StackOverflow寻求帮助。
我正在使用Spring Boot，并且正在解析百里香模板。解析模板时，我发现模板尝试解析th：field值时，会出现异常：Caused by: java.lang.IllegalAccessError: tried to access class org.springframework.web.servlet.tags.form.ValueFormatter from class org.springframework.web.servlet.tags.form.ValueFormatterWrapper
我不确定发生了什么，我发现如果我从模板中删除th：field，它会很好地处理模板。堆栈跟踪中没有对我的代码的引用，全部是Spring，Thymeleaf和Tomcat的东西。这使我相信这是一个实际的Spring错误。
一些堆栈跟踪如下：
Caused by: java.lang.IllegalAccessError: tried to access class org.springframework.web.servlet.tags.form.ValueFormatter from class org.springframework.web.servlet.tags.form.ValueFormatterWrapper
at org.springframework.web.servlet.tags.form.ValueFormatterWrapper.getDisplayString(ValueFormatterWrapper.java:40)
at org.thymeleaf.spring4.processor.SpringInputGeneralFieldTagProcessor.doProcess(SpringInputGeneralFieldTagProcessor.java:110)
at org.thymeleaf.spring4.processor.AbstractSpringFieldTagProcessor.doProcess(AbstractSpringFieldTagProcessor.java:179)
at org.thymeleaf.processor.element.AbstractAttributeTagProcessor.doProcess(AbstractAttributeTagProcessor.java:74)
at org.thymeleaf.processor.element.AbstractElementTagProcessor.process(AbstractElementTagProcessor.java:95)
at org.thymeleaf.util.ProcessorConfigurationUtils$ElementTagProcessorWrapper.process(ProcessorConfigurationUtils.java:633)
at org.thymeleaf.engine.ProcessorTemplateHandler.handleStandaloneElement(ProcessorTemplateHandler.java:918)
at org.thymeleaf.engine.StandaloneElementTag.beHandled(StandaloneElementTag.java:228)
at org.thymeleaf.engine.Model.process(Model.java:282)
at org.thymeleaf.engine.Model.process(Model.java:290)
at org.thymeleaf.engine.IteratedGatheringModelProcessable.processIterationModel(IteratedGatheringModelProcessable.java:367)
at org.thymeleaf.engine.IteratedGatheringModelProcessable.process(IteratedGatheringModelProcessable.java:221)
at org.thymeleaf.engine.ProcessorTemplateHandler.handleCloseElement(ProcessorTemplateHandler.java:1640)
at org.thymeleaf.engine.CloseElementTag.beHandled(CloseElementTag.java:139)
at org.thymeleaf.engine.Model.process(Model.java:282)
at org.thymeleaf.engine.Model.process(Model.java:290)
at org.thymeleaf.engine.IteratedGatheringModelProcessable.processIterationModel(IteratedGatheringModelProcessable.java:367)
at org.thymeleaf.engine.IteratedGatheringModelProcessable.process(IteratedGatheringModelProcessable.java:221)
at org.thymeleaf.engine.ProcessorTemplateHandler.handleCloseElement(ProcessorTemplateHandler.java:1640)
at org.thymeleaf.engine.CloseElementTag.beHandled(CloseElementTag.java:139)
at org.thymeleaf.engine.Model.process(Model.java:282)
at org.thymeleaf.engine.Model.process(Model.java:290)
at org.thymeleaf.engine.IteratedGatheringModelProcessable.processIterationModel(IteratedGatheringModelProcessable.java:367)
at org.thymeleaf.engine.IteratedGatheringModelProcessable.process(IteratedGatheringModelProcessable.java:221)
at org.thymeleaf.engine.ProcessorTemplateHandler.handleCloseElement(ProcessorTemplateHandler.java:1640)
at org.thymeleaf.engine.CloseElementTag.beHandled(CloseElementTag.java:139)
at org.thymeleaf.engine.TemplateModel.process(TemplateModel.java:136)
at org.thymeleaf.engine.TemplateManager.parseAndProcess(TemplateManager.java:661)
at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1098)
at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1072)
at org.thymeleaf.spring4.view.ThymeleafView.renderFragment(ThymeleafView.java:352)
at org.thymeleaf.spring4.view.ThymeleafView.render(ThymeleafView.java:190)
at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1286)
at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1041)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:984)
... 49 more
问题模板中的特定行是：
<input type="text" th:field="${configForm.configs[__${configIter.index}__].siteId}" th:text="${progressItemAttribute.attribute.name != null} ? ${progressItemAttribute.attribute.name} : 'null value!'"/>