Java 使用org.eclipse.wst.WSDL.util.WSDLResourceImpl加载WSDL文件时出现Nullpointer异常
当我们使用org.eclipse.wst.WSDL.util.WSDLResourceImpl加载WSDL文件时,遇到了一个问题,并且发现了Nullpointer异常问题 我们已经注意到,org.eclipse.wst.wsdl.internal.impl.MessageImpl中的以下代码在一个类加载器中初始化EMF模型,而第二个类加载器调用 EMF WSDl加载Java 使用org.eclipse.wst.WSDL.util.WSDLResourceImpl加载WSDL文件时出现Nullpointer异常,java,eclipse,wsdl,emf,Java,Eclipse,Wsdl,Emf,当我们使用org.eclipse.wst.WSDL.util.WSDLResourceImpl加载WSDL文件时,遇到了一个问题,并且发现了Nullpointer异常问题 我们已经注意到,org.eclipse.wst.wsdl.internal.impl.MessageImpl中的以下代码在一个类加载器中初始化EMF模型,而第二个类加载器调用 EMF WSDl加载 public void handleUnreconciledElement(Element child, Collection r
public void handleUnreconciledElement(Element child, Collection remainingModelObjects)
{
switch (WSDLUtil.getInstance().getWSDLType(child))
{
case WSDLConstants.PART:
{
Part part = ((WSDLPackage)EPackage.Registry.INSTANCE.getEPackage(WSDLPackage.eNS_URI)).getWSDLFactory().createPart();
part.setEnclosingDefinition(getEnclosingDefinition());
part.setElement(child);
getEParts().add(part);
break;
}
default:
{
super.handleUnreconciledElement(child, remainingModelObjects);
break;
}
}
}
Nullpointer异常发生在这里
Part Part=((WSDLPackage)EPackage.Registry.INSTANCE.getEPackage(WSDLPackage.eNS_URI)).getWSDLFactory().createPart()
因为注册表没有第二个类加载器的WSDL命名空间URI的条目
上述问题的详细情况如下所示
MessageImpl.handleUnreconciledElement(Element, Collection) line: 411
MessageImpl(WSDLElementImpl).reconcileContents(Element) line: 1296
MessageImpl(WSDLElementImpl).reconcile(Element) line: 1242
MessageImpl(WSDLElementImpl).changeAttribute(EAttribute) line: 1215
MessageImpl.changeAttribute(EAttribute) line: 467
MessageImpl(WSDLElementImpl).eNotify(Notification) line: 472
MessageImpl(WSDLElementImpl).setElementGen(Element) line: 181
MessageImpl(WSDLElementImpl).setElement(Element) line: 367
DefinitionImpl.handleUnreconciledElement(Element, Collection) line: 1785
DefinitionImpl(WSDLElementImpl).reconcileContents(Element) line: 1296
DefinitionImpl(WSDLElementImpl).reconcile(Element) line: 1242
DefinitionImpl(WSDLElementImpl).changeAttribute(EAttribute) line: 1215
DefinitionImpl.changeAttribute(EAttribute) line: 1997
DefinitionImpl(WSDLElementImpl).eNotify(Notification) line: 472
DefinitionImpl.eNotify(Notification) line: 515
DefinitionImpl(WSDLElementImpl).setElementGen(Element) line: 181
DefinitionImpl(WSDLElementImpl).setElement(Element) line: 367
DefinitionImpl.setElement(Element) line: 1704
DefinitionImpl.createDefinition(Node, String, boolean) line: 1511
WSDLResourceImpl.handleDefinitionElement(Element) line: 572
WSDLResourceImpl.findDefinition(Element) line: 540
WSDLResourceImpl.doLoad(InputSource, Map) line: 285
WSDLResourceImpl.doLoad(InputStream, Map) line: 358
WSDLResourceImpl(ResourceImpl).load(InputStream, Map<?,?>) line: 1505
protected void handleSchemaElement(Element element, boolean isMeta)
{
XSDSchema xsdSchema;
if (element == null)
{
xsdSchema = XSDFactory.eINSTANCE.createXSDSchema();
xsdSchema.getQNamePrefixToNamespaceMap().put(null, XSDConstants.SCHEMA_FOR_SCHEMA_URI_2001);
}
else if (isMeta)
{
xsdSchema = XSDSchemaImpl.createMetaSchema(element);
}
else
{
xsdSchema = XSDSchemaImpl.createSchema(element);
}
getContents().add(xsdSchema);
}
现在,XSD也会出现同样的问题,因为当我们使用org.eclipse.XSD.util.XSDResourceImpl加载XSD文件时,会出现下面的方法
XSDResourceImpl.handleSchemaElement(元素,布尔值)
这里的代码如下所示
MessageImpl.handleUnreconciledElement(Element, Collection) line: 411
MessageImpl(WSDLElementImpl).reconcileContents(Element) line: 1296
MessageImpl(WSDLElementImpl).reconcile(Element) line: 1242
MessageImpl(WSDLElementImpl).changeAttribute(EAttribute) line: 1215
MessageImpl.changeAttribute(EAttribute) line: 467
MessageImpl(WSDLElementImpl).eNotify(Notification) line: 472
MessageImpl(WSDLElementImpl).setElementGen(Element) line: 181
MessageImpl(WSDLElementImpl).setElement(Element) line: 367
DefinitionImpl.handleUnreconciledElement(Element, Collection) line: 1785
DefinitionImpl(WSDLElementImpl).reconcileContents(Element) line: 1296
DefinitionImpl(WSDLElementImpl).reconcile(Element) line: 1242
DefinitionImpl(WSDLElementImpl).changeAttribute(EAttribute) line: 1215
DefinitionImpl.changeAttribute(EAttribute) line: 1997
DefinitionImpl(WSDLElementImpl).eNotify(Notification) line: 472
DefinitionImpl.eNotify(Notification) line: 515
DefinitionImpl(WSDLElementImpl).setElementGen(Element) line: 181
DefinitionImpl(WSDLElementImpl).setElement(Element) line: 367
DefinitionImpl.setElement(Element) line: 1704
DefinitionImpl.createDefinition(Node, String, boolean) line: 1511
WSDLResourceImpl.handleDefinitionElement(Element) line: 572
WSDLResourceImpl.findDefinition(Element) line: 540
WSDLResourceImpl.doLoad(InputSource, Map) line: 285
WSDLResourceImpl.doLoad(InputStream, Map) line: 358
WSDLResourceImpl(ResourceImpl).load(InputStream, Map<?,?>) line: 1505
protected void handleSchemaElement(Element element, boolean isMeta)
{
XSDSchema xsdSchema;
if (element == null)
{
xsdSchema = XSDFactory.eINSTANCE.createXSDSchema();
xsdSchema.getQNamePrefixToNamespaceMap().put(null, XSDConstants.SCHEMA_FOR_SCHEMA_URI_2001);
}
else if (isMeta)
{
xsdSchema = XSDSchemaImpl.createMetaSchema(element);
}
else
{
xsdSchema = XSDSchemaImpl.createSchema(element);
}
getContents().add(xsdSchema);
}
在这里,XSDFcatory用于流动方式
xsdSchema=XSDFactory.eINSTANCE.createXSDSchema()
因此,我们想知道为什么不能在org.eclipse.wst.wsdl.internal.impl.MessageImpl中更改此代码,如下所示,这可以解决问题,并且与XSD行为一致
public void handleUnreconciledElement(Element child, Collection remainingModelObjects)
{
switch (WSDLUtil.getInstance().getWSDLType(child))
{
case WSDLConstants.PART:
{
Part part = WSDLFactory.eINSTANCE.createPart();
part.setEnclosingDefinition(getEnclosingDefinition());
part.setElement(child);
getEParts().add(part);
break;
}
default:
{
super.handleUnreconciledElement(child, remainingModelObjects);
break;
}
}
}
否则,请告知我们是否有其他解决此问题的替代方案。显然,当存在多个类加载器时,类加载会导致EPackage.Registry.INSTANCE中出现问题
我们还有两个疑问
1) 为什么注册表是每个类加载器。如果是这样的话,那么当EMF一经初始化就不允许再次初始化时,如何为多个类加载器填充注册表
2) 同样在org.eclipse.wst.wsdl.internal.impl.MessageImpl中,为什么不能使用WSDFactory.eINSTANCE代替注册表
请让我们知道,这对我们正在进行的项目之一非常重要。我们需要有非常高优先级的解决方案
谢谢和问候
阿南