将对象转换为xml时出现此异常。这种情况间歇发生，而不是每次都发生。这是由于eclipselink 2.5.1版本中的任何错误吗？
Caused by: javax.xml.bind.JAXBException
- with linked exception:
[java.lang.NullPointerException]
at org.eclipse.persistence.jaxb.JAXBContext$TypeMappingInfoInput.createContextState(JAXBContext.java:1021)
at org.eclipse.persistence.jaxb.JAXBContext.<init>(JAXBContext.java:174)
at org.eclipse.persistence.jaxb.JAXBContextFactory.createContext(JAXBContextFactory.java:165)
at org.eclipse.persistence.jaxb.JAXBContextFactory.createContext(JAXBContextFactory.java:152)
at org.eclipse.persistence.jaxb.JAXBContextFactory.createContext(JAXBContextFactory.java:112)
at org.eclipse.persistence.jaxb.JAXBContextFactory.createContext(JAXBContextFactory.java:102)
at sun.reflect.GeneratedMethodAccessor93.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:250)
at javax.xml.bind.ContextFinder.find(ContextFinder.java:447)
at cts.emv.bind.JAXBTransformer.transformToXml(JAXBTransformer.java:88)
... 10 more
Caused by: java.lang.NullPointerException
at org.eclipse.persistence.jaxb.JAXBContext$JAXBContextState.updateResolverForFields(JAXBContext.java:1252)
at org.eclipse.persistence.jaxb.JAXBContext$JAXBContextState.processXMLDescriptor(JAXBContext.java:1235)
at org.eclipse.persistence.jaxb.JAXBContext$JAXBContextState.processRefClasses(JAXBContext.java:1219)
at org.eclipse.persistence.jaxb.JAXBContext$JAXBContextState.processXMLDescriptor(JAXBContext.java:1243)
at org.eclipse.persistence.jaxb.JAXBContext$JAXBContextState.updateNamespaces(JAXBContext.java:1208)
at org.eclipse.persistence.jaxb.JAXBContext$JAXBContextState.<init>(JAXBContext.java:1135)
at org.eclipse.persistence.jaxb.JAXBContext$JAXBContextState.<init>(JAXBContext.java:1156)
at org.eclipse.persistence.jaxb.JAXBContext$TypeMappingInfoInput.createContextState(JAXBContext.java:1051)
at org.eclipse.persistence.jaxb.JAXBContext$TypeMappingInfoInput.createContextState(JAXBContext.java:1018)
at org.eclipse.persistence.jaxb.JAXBContext.<init>(JAXBContext.java:174)
at org.eclipse.persistence.jaxb.JAXBContextFactory.createContext(JAXBContextFactory.java:165)
at org.eclipse.persistence.jaxb.JAXBContextFactory.createContext(JAXBContextFactory.java:152)
at org.eclipse.persistence.jaxb.JAXBContextFactory.createContext(JAXBContextFactory.java:112)
at org.eclipse.persistence.jaxb.JAXBContextFactory.createContext(JAXBContextFactory.java:102)
at sun.reflect.GeneratedMethodAccessor93.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:263)
at javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:250)
at javax.xml.bind.ContextFinder.find(ContextFinder.java:447)
at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:652)
at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:599)
at cts.emv.bind.JAXBTransformer.transformToXml(JAXBTransformer.java:87)
at cts.ws.policy.WSAuthPolicy.getAuthDirectPaymentRequest(WSAuthPolicy.java:308)
at cts.ws.policy.WSAuthPolicy.getPareResponseMsg(WSAuthPolicy.java:202)
at cts.ws.policy.WSAuthPolicy.getUnAcknowledgedRequests(WSAuthPolicy.java:324)
相同的代码如下，它在此行失败JAXBContext jc = JAXBContext.newInstance（clazz）;
public String transformToXml(Object pObject, boolean validate) throws
XMLProcessingException, XMLValidationException {
StringWriter writer = new StringWriter();
Class clazz = pObject.getClass();
ValidationErrorHandler handler = new ValidationErrorHandler();
try {
JAXBContext jc = JAXBContext.newInstance(clazz);
Marshaller m = jc.createMarshaller();
m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
m.setProperty(Marshaller.JAXB_ENCODING, "UTF-16");
if(validate){
Schema schema = SchemaValidator.getInstance().getSchema(clazz);
if(schema == null){
throw new XMLProcessingException(ExceptionSeverity.ERROR, this, "transformToXML",
"Error validating object. Schema for " + clazz.getName() + " not found.");
}
m.setEventHandler(handler);
m.setSchema(schema);
}
m.marshal(pObject, writer);
}catch(JAXBException je){
Throwable cause = je.getCause();
if(cause != null){
Throwable innerCause = cause.getCause();
if(innerCause != null && innerCause instanceof MarshalSAXParseException){
throw new XMLValidationException((Exception)innerCause, ExceptionSeverity.ERROR, this, "transformToXml", handler.getMessages());
}
throw new XMLProcessingException(je, ExceptionSeverity.ERROR, this, "transformToXML",
"Error transforming Object to XML");
}
throw new XMLProcessingException(je, ExceptionSeverity.ERROR, this, "transformToXML",
"Error transforming Object to XML");
}
return writer.toString();
Eclipse Persistence Services - 2.3.2.v20111125-r10461
@SuppressWarnings("serial")
@XmlRootElement(name="DirectPaymentConfirmationRequest")
@XmlAccessorType(XmlAccessType.FIELD)
public class DirectPaymentConfirmationRequest implements Serializable {
@XmlElement(name="DirectPaymentReferenceId", nillable=false, required=true)
private Long mDirectPaymentReferenceId;
@XmlElement(name="PaymentCardTransactionType", nillable=false, required=true)
private String mPaymentCardTransactionType;
@XmlElement(name="Amount", nillable=false, required=true)
private Integer mAmount;
@XmlElement(name="MerchantId", nillable=false, required=true)
private String mMerchantId;
@XmlElement(name="AddressCheckRequested", nillable=false, required=true)
private Boolean mAddressCheckRequested;
@XmlElement(name="AuthorisationTimeStamp" , nillable=false, required=true)
private Calendar mAuthorisationTimeStamp;
@XmlElements({
@XmlElement(name="AcquirerResponse", type=DirectPaymentAcquirerResponse.class),
@XmlElement(name="Error", type=Error.class)
})
private Object mResponse;
@XmlElement(name="CardDetail",required=false)
private CardDetail mCardDetail;
@SuppressWarnings("serial")
@XmlRootElement(name="AcquirerResponse")
@XmlAccessorType(XmlAccessType.FIELD)
public class DirectPaymentAcquirerResponse extends AuthAuthorisationCode implements Serializable {
@XmlElement(name="AddressCheckResult", nillable=true, required=true)
private String mAddressCheckResult;
@XmlElement(name="CVVCheckResult", nillable=true, required=true)
private String mCVVCheckResult;
@XmlElement(name="ProductCode", nillable=true, required=true)
private String mProductCode;
@XmlElement(name="TraceId", nillable=true, required=true)
private String mTraceId;
@SuppressWarnings("serial")
@XmlRootElement(name="Error")
@XmlAccessorType(XmlAccessType.FIELD)
public class Error implements Serializable {
@XmlElement(name="ErrorCode", nillable=false, required=true)
private Short mErrorCode;
@XmlElement(name="ErrorDescription", nillable=false, required=true)
private String mErrorDescription;