帮助解决JAXB解组NPE问题
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我正在使用我无法控制的API,该API返回XML。
基本上,我有一个“ 0”对象,可以包含多个“ 0”和“ 2”对象,这些对象没有被任何标签包装,除了其他几个基本字段。
“ 2”对象包含几个基本字段,以及2个由“ 4”和“ 5”标记包装的列表。
以下是此类XML的示例:
<hwreply>
<result>1</result>
<directory>
<file>
<created>DATE</created>
<modified>DATE</modified>
<name>STRING</name>
<size>INT</size>
<tPath>STRING</tPath>
<oPath>STRING</oPath>
<aPath>STRING</aPath>
<tPathList>
<tPath>STRING</tPath>
...
</tPathList>
<oPathList>
<oPath>STRING</oPath>
...
</oPathList>
</file>
<file>...</file>
...
<directory>...</directory>
<directory>...</directory>
...
<nEntries>5</nEntries>
<created>DATE</created>
<modified>DATE</modified>
</directory>
</hwreply>
我已经创建了Directory和File对象,以及根目录OpenDirectory。当我打电话
OpenDirectory od = response.getEntity(OpenDirectory.class);
我得到以下异常:
Exception in thread \"main\" java.lang.NullPointerException
at com.sun.xml.internal.bind.v2.runtime.reflect.Lister$CollectionLister.addToPack(Lister.java:290)
at com.sun.xml.internal.bind.v2.runtime.reflect.Lister$CollectionLister.addToPack(Lister.java:254)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.Scope.add(Scope.java:106)
at com.sun.xml.internal.bind.v2.runtime.property.ArrayERProperty$ReceiverImpl.receive(ArrayERProperty.java:195)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext.endElement(UnmarshallingContext.java:507)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.SAXConnector.endElement(SAXConnector.java:145)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endElement(AbstractSAXParser.java:601)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanEndElement(XMLDocumentFragmentScannerImpl.java:1782)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2938)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:648)
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:140)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:511)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:808)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:737)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:119)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1205)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:522)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal0(UnmarshallerImpl.java:200)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal(UnmarshallerImpl.java:173)
at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(AbstractUnmarshallerImpl.java:120)
at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(AbstractUnmarshallerImpl.java:103)
at com.sun.jersey.core.impl.provider.entity.XMLRootElementProvider.readFrom(XMLRootElementProvider.java:115)
at com.sun.jersey.core.provider.jaxb.AbstractRootElementProvider.readFrom(AbstractRootElementProvider.java:111)
at com.sun.jersey.api.client.ClientResponse.getEntity(ClientResponse.java:553)
at com.sun.jersey.api.client.ClientResponse.getEntity(ClientResponse.java:506)
at liveperson.lphosting.plugins.cdn.proxy.highwinds.HighwindsProxy.getDirectory(HighwindsProxy.java:49)
at liveperson.lphosting.plugins.cdn.proxy.highwinds.HighwindsProxy.main(HighwindsProxy.java:59)
我认为这与我拥有的列表之一有关,但是我无法弄清楚哪里出了问题。任何帮助,将不胜感激。
提前致谢。
下面是类(减去一些字段/方法):
@XmlRootElement(name = \"hwreply\")
public class OpenDirectory extends ResponseBase {
@XmlElement(name=\"session\")
public Session getSession() {...}
public void setSession(Session session) {...}
@XmlElement(name=\"directory\")
public Directory getDirectory() {...}
public void setDirectory(Directory directory) {...}
}
public class Directory {
...
private List<Directory> directories;
private List<File> files;
@XmlElement(name=\"nEntries\")
public int getnEntries() {...}
public void setnEntries(int nEntries) {...}
@XmlElement(name=\"name\")
public String getName() {... }
public void setName(String name) {... }
@XmlElement(name=\"readonly\")
public boolean isReadonly() {... }
public void setReadonly(boolean readonly) { ... }
@XmlElement (name=\"created\")
public String getCreated() { ... }
public void setCreated(String created) { ... }
@XmlElement(name=\"modified\")
public String getModified() {... }
public void setModified(String modified) {... }
@XmlElements(
@XmlElement(name=\"directory\", type=Directory.class)
)
public List<Directory> getDirectories() {
return directories;
}
public void setDirectories(List directories) {
this.directories = directories;
}
@XmlElements(
@XmlElement(name=\"file\", type=File.class)
)
public List<File> getFiles() {
return files;
}
public void setFiles(List files) {
this.files = files;
}
}
public class File {
private List<String> tPathList;
private List<String> oPathList;
@XmlElement(name=\"xferStatus\")
public int getXferStatus() {...}
public void setXferStatus(int xferStatus) {...}
@XmlElement(name=\"size\")
public int getSize() {...}
public void setSize(int size) {...}
@XmlElement(name=\"tPath\")
public String gettPath() {...}
public void settPath(String tPath) {...}
@XmlElement(name=\"oPath\")
public String getoPath() {...}
public void setoPath(String oPath) {...}
@XmlElementWrapper(name=\"tPathList\")
@XmlElements(
@XmlElement(name=\"tPath\", type=String.class)
)
public List gettPathList() {
return tPathList;
}
public void settPathList(List tPathList) {...}
@XmlElementWrapper(name=\"oPathList\")
@XmlElements(
@XmlElement(name=\"oPath\", type=String.class)
)
public List getoPathList() {
return oPathList;
}
public void setoPathList(List oPathList) {
this.oPathList = oPathList;
}
}
没有找到相关结果
已邀请:
2 个回复
迪擅哨乘傅
素汞读
时,请看一下返回的对象。 通常它应为
类型。但是,如果它来自某些glassfish3库,例如:
那使我产生了同样的例外。如果
从此jar中找到第一个实现的
类,则更改了classpath的顺序,最后解组工作正常。