JavaTomcat删除临时目录和工作目录解决了一个类路径问题，但为什么呢？

Question

昨天生产部署出了问题。部署后，soap请求的封送处理会抛出此错误

java.lang.NoClassDefFoundError: org/apache/xerces/jaxp/datatype/XMLGregorianCalendarImpl$Parser
at org.apache.xerces.jaxp.datatype.XMLGregorianCalendarImpl.<init>(Unknown Source)
at org.apache.xerces.jaxp.datatype.DatatypeFactoryImpl.newXMLGregorianCalendar(Unknown Source)
at com.sun.xml.internal.bind.v2.model.impl.RuntimeBuiltinLeafInfoImpl$12.parse(RuntimeBuiltinLeafInfoImpl.java:568)
at com.sun.xml.internal.bind.v2.model.impl.RuntimeBuiltinLeafInfoImpl$12.parse(RuntimeBuiltinLeafInfoImpl.java:544)
at com.sun.xml.internal.bind.v2.runtime.reflect.TransducedAccessor$CompositeTransducedAccessorImpl.parse(TransducedAccessor.java:230)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.LeafPropertyLoader.text(LeafPropertyLoader.java:50)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext.text(UnmarshallingContext.java:499)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.InterningXmlVisitor.text(InterningXmlVisitor.java:78)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.SAXConnector.processText(SAXConnector.java:166)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.SAXConnector.endElement(SAXConnector.java:139)
at com.sun.xml.internal.bind.unmarshaller.DOMScanner.visit(DOMScanner.java:240)
at com.sun.xml.internal.bind.unmarshaller.DOMScanner.visit(DOMScanner.java:266)
at com.sun.xml.internal.bind.unmarshaller.DOMScanner.visit(DOMScanner.java:235)
at com.sun.xml.internal.bind.unmarshaller.DOMScanner.visit(DOMScanner.java:266)
at com.sun.xml.internal.bind.unmarshaller.DOMScanner.visit(DOMScanner.java:235)
at com.sun.xml.internal.bind.unmarshaller.DOMScanner.visit(DOMScanner.java:266)
at com.sun.xml.internal.bind.unmarshaller.DOMScanner.visit(DOMScanner.java:235)
at com.sun.xml.internal.bind.unmarshaller.DOMScanner.scan(DOMScanner.java:112)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal0(UnmarshallerImpl.java:309)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal(UnmarshallerImpl.java:292)
at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(AbstractUnmarshallerImpl.java:127)
at org.springframework.oxm.jaxb.Jaxb2Marshaller.unmarshal(Jaxb2Marshaller.java:746)
at org.springframework.ws.support.MarshallingUtils.unmarshal(MarshallingUtils.java:62)
at org.springframework.ws.client.core.WebServiceTemplate$3.extractData(WebServiceTemplate.java:413)
at org.springframework.ws.client.core.WebServiceTemplate.doSendAndReceive(WebServiceTemplate.java:616)
at org.springframework.ws.client.core.WebServiceTemplate.sendAndReceive(WebServiceTemplate.java:555)
at org.springframework.ws.client.core.WebServiceTemplate.marshalSendAndReceive(WebServiceTemplate.java:390)
at org.springframework.ws.client.core.WebServiceTemplate.marshalSendAndReceive(WebServiceTemplate.java:383)
at org.springframework.ws.client.core.WebServiceTemplate.marshalSendAndReceive(WebServiceTemplate.java:373)

应用程序的其余部分运行正常。只有这个编组出了问题。我们在不同的linux服务器上有两个Tomcat。在两台服务器上，我们都出现了这个错误。我们试图启动和停止服务器，但没有效果

在令人沮丧的几个小时后，我们找到了解决办法。我们删除了tomcat的temp和work目录，现在重启后一切都正常

但为什么这对两台服务器都有效？删除temp和work direcotry处理classpaht问题的方法是什么