在Eclipse中生成WSDL時Java ClassCastException？

Question

我想在Eclipse中創建一個新的Web服務（自下而上，apache axis 1，tomcat 6），但是我在嘗試之前得到警告，然後出現錯誤。

錯誤：

IWAB0398E Error in generating WSDL from Java: java.lang.ClassCastException: org.apache.axis.encoding.ser.BeanSerializer cannot be cast to org.apache.axis.encoding.Serializer 

這裏是我使用的序列化：警告

public class IntegrationUtils extends Utilities implements java.io.Serializable { 
    private static final long serialVersionUID = 7515033201857603982L; 

摘要： 很多的警告都與我的網站使用的類做服務類沒有默認構造函數。

這裏是警告：

The service class "net.abc.Indy.WebService.IntegrationUtils" does not comply to one or more requirements of the JAX-RPC 1.1 specification, and may not deploy or function correctly. 
The service class "net.abc.Indy.WebService.IntegrationUtils" does not comply to one or more requirements of the JAX-RPC 1.1 specification, and may not deploy or function correctly. 
    The field or property "headers" on the value type "org.apache.axis.AxisFault" used via the service class "net.abc.Indy.WebService.IntegrationUtils" has a data type, "java.util.ArrayList", that is not supported by the JAX-RPC 1.1 specification. Instances of the type may not serialize or deserialize correctly. Loss of data or complete failure of the Web service may result. 
    The field or property "cause" on the value type "java.rmi.RemoteException" used via the service class "net.abc.Indy.WebService.IntegrationUtils" has a data type, "java.lang.Throwable", that is not supported by the JAX-RPC 1.1 specification. Instances of the type may not serialize or deserialize correctly. Loss of data or complete failure of the Web service may result. 
    The field or property "noClasses" on the value type "org.apache.axis.description.TypeDesc" used via the service class "net.abc.Indy.WebService.IntegrationUtils" has a data type, "java.lang.Class", that is not supported by the JAX-RPC 1.1 specification. Instances of the type may not serialize or deserialize correctly. Loss of data or complete failure of the Web service may result. 
    The field or property "noObjects" on the value type "org.apache.axis.description.TypeDesc" used via the service class "net.abc.Indy.WebService.IntegrationUtils" has a data type, "java.lang.Object", that is not supported by the JAX-RPC 1.1 specification. Instances of the type may not serialize or deserialize correctly. Loss of data or complete failure of the Web service may result. 
    The field or property "propertyDescriptorMap" on the value type "org.apache.axis.description.TypeDesc" used via the service class "net.abc.Indy.WebService.IntegrationUtils" has a data type, "java.util.Map", that is not supported by the JAX-RPC 1.1 specification. Instances of the type may not serialize or deserialize correctly. Loss of data or complete failure of the Web service may result. 
    The field or property "type" on the value type "org.apache.axis.utils.BeanPropertyDescriptor" used via the service class "net.abc.Indy.WebService.IntegrationUtils" has a data type, "java.lang.Class", that is not supported by the JAX-RPC 1.1 specification. Instances of the type may not serialize or deserialize correctly. Loss of data or complete failure of the Web service may result. 
    The field or property "actualType" on the value type "org.apache.axis.utils.BeanPropertyDescriptor" used via the service class "net.abc.Indy.WebService.IntegrationUtils" has a data type, "java.lang.Class", that is not supported by the JAX-RPC 1.1 specification. Instances of the type may not serialize or deserialize correctly. Loss of data or complete failure of the Web service may result. 
    The field or property "javaType" on the value type "org.apache.axis.description.FieldDesc" used via the service class "net.abc.Indy.WebService.IntegrationUtils" has a data type, "java.lang.Class", that is not supported by the JAX-RPC 1.1 specification. Instances of the type may not serialize or deserialize correctly. Loss of data or complete failure of the Web service may result. 
    The field or property "headers" on the value type "org.apache.axis.AxisFault" used via the service class "net.abc.Indy.WebService.IntegrationUtils" has a data type, "java.util.ArrayList", that is not supported by the JAX-RPC 1.1 specification. Instances of the type may not serialize or deserialize correctly. Loss of data or complete failure of the Web service may result. 
    The field or property "cause" on the value type "java.rmi.RemoteException" used via the service class "net.abc.Indy.WebService.IntegrationUtils" has a data type, "java.lang.Throwable", that is not supported by the JAX-RPC 1.1 specification. Instances of the type may not serialize or deserialize correctly. Loss of data or complete failure of the Web service may result. 
    The value type "org.w3c.dom.Element" used via the service class "net.abc.Indy.WebService.IntegrationUtils" does not have a public default constructor. Chapter 5.4 of the JAX-RPC 1.1 specification requires a value type to have a public default constructor, otherwise a JAX-RPC 1.1 compliant Web service engine may be unable to construct an instance of the value type during deserialization. 
    The value type "org.w3c.dom.TypeInfo" used via the service class "net.abc.Indy.WebService.IntegrationUtils" does not have a public default constructor. Chapter 5.4 of the JAX-RPC 1.1 specification requires a value type to have a public default constructor, otherwise a JAX-RPC 1.1 compliant Web service engine may be unable to construct an instance of the value type during deserialization. 
    The value type "org.apache.axis.description.TypeDesc" used via the service class "net.abc.Indy.WebService.IntegrationUtils" does not have a public default constructor. Chapter 5.4 of the JAX-RPC 1.1 specification requires a value type to have a public default constructor, otherwise a JAX-RPC 1.1 compliant Web service engine may be unable to construct an instance of the value type during deserialization. 
    The value type "org.apache.axis.utils.BeanPropertyDescriptor" used via the service class "net.abc.Indy.WebService.IntegrationUtils" does not have a public default constructor. Chapter 5.4 of the JAX-RPC 1.1 specification requires a value type to have a public default constructor, otherwise a JAX-RPC 1.1 compliant Web service engine may be unable to construct an instance of the value type during deserialization. 
    The value type "org.apache.axis.description.FieldDesc" used via the service class "net.abc.Indy.WebService.IntegrationUtils" does not have a public default constructor. Chapter 5.4 of the JAX-RPC 1.1 specification requires a value type to have a public default constructor, otherwise a JAX-RPC 1.1 compliant Web service engine may be unable to construct an instance of the value type during deserialization. 

感謝您的幫助！

Answer 1

無論何時您有重複的JAR或具有相同類文件的JAR文件，您都會得到ClassCastException。在你的情況下，它也可能是一個不同的Axis版本。這個問題通常發生在你的tomcat實例化一個axis-class並將這個實例發送給你的應用程序時。另一方的應用程序可以使用自己的jar（打包到WAR或EAR中）。由於Web或Java EE容器中的多類加載器hirarchie的可能性，您可以在同一臺服務器上同時運行不同的webapps和自己的jar-files-versions版本。

但是如何解決呢？那麼，在你的tomcat的所有jar和你的web應用程序中搜索這些類（在StackTrace中顯示）並檢查，哪一個用於實例化Axis-Requests/-responses。最簡單的解決方案是，從您的Web應用程序中刪除相關的jar，並根據您的運行時環境（您的tomcat）的jar編譯代碼。如果tomcat-jar-versions不適合您的情況，請嘗試修補server-jar。 另一種解決方案可以是Web應用程序/服務器的不同配置來控制類加載器。