java - 测试 Web 服务时出现强制转换异常

Question

我是 Java Web 服务的新手，在过去的 4 天里我一直被这个问题困扰。问题来了，我打算创建 Web 服务以供其他应用程序使用。要求是 Web 服务必须从表中返回多条记录，所以我创建了一个示例 Web 服务，这是代码

界面

@WebService 
@SOAPBinding(style = Style.DOCUMENT)
public interface TestClassInt {

/**
 * @param args
 */

@WebMethod
SampleClass[] getCaseId (String country);
}

具有两个字符串对象的自定义类

public class SampleClass {
protected String caseid;
protected String dummy;

public SampleClass(){
    super();
}
public SampleClass(String caseid,String dummy){
    this.caseid=caseid;
    this.dummy=dummy;
}
public String getDummy() {
    return dummy;
}

public void setDummy(String dummy) {
    this.dummy = dummy;
}

public String getCaseid() {
    return caseid;
}

public void setCaseid(String caseid) {
    this.caseid = caseid;
}
}

这是实现

@WebService(endpointInterface = "com.org.ccb.test.TestClassInt")
public class TestClassImpl implements TestClassInt {

public SampleClass[] getCaseId(String country) {
    // TODO Auto-generated method stub
    System.out.println("Console " + country);
    SampleClass tempSc[] = new SampleClass[2];
    tempSc[0]=new SampleClass();
    tempSc[1]=new SampleClass();
    tempSc[0].setCaseid(country);
    tempSc[0].setDummy(country);
    tempSc[1].setCaseid(country);
    tempSc[1].setDummy(country);
    return tempSc;
}

}

使用 JBoss Developer Studio 生成的 WSDL 是

<?xml version="1.0" encoding="UTF-8"?>
<wsdl:definitions name="TestClassImplService targetNamespace="http://test.ccb.org.com/" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" xmlns:tns="http://test.ccb.org.com/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/">
<wsdl:types>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:tns="http://test.ccb.org.com/" targetNamespace="http://test.ccb.org.com/" version="1.0">
<xs:element name="getCaseId" type="tns:getCaseId"/>
<xs:element name="getCaseIdResponse" type="tns:getCaseIdResponse"/>
<xs:complexType name="getCaseId">
<xs:sequence>
<xs:element minOccurs="0" name="arg0" type="xs:string"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="getCaseIdResponse">
<xs:sequence>
<xs:element maxOccurs="unbounded" name="sampleClass" type="tns:sampleClass"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="sampleClass">
<xs:sequence>
<xs:element maxOccurs="1" name="caseid" type="xs:string"/>
<xs:element maxOccurs="1" name="dummy" type="xs:string"/>
</xs:sequence>
</xs:complexType>
</xs:schema>
</wsdl:types>
<wsdl:message name="getCaseIdResponse">
<wsdl:part name="parameters" element="tns:getCaseIdResponse">
</wsdl:part>
</wsdl:message>
<wsdl:message name="getCaseId">
<wsdl:part name="parameters" element="tns:getCaseId">
</wsdl:part>
</wsdl:message>
<wsdl:portType name="TestClassInt">
<wsdl:operation name="getCaseId">
  <wsdl:input name="getCaseId" message="tns:getCaseId">
</wsdl:input>
  <wsdl:output name="getCaseIdResponse" message="tns:getCaseIdResponse">
</wsdl:output>
</wsdl:operation>
</wsdl:portType>
<wsdl:binding name="TestClassImplServiceSoapBinding" type="tns:TestClassInt">
<soap:binding style="document" transport="http://schemas.xmlsoap.org/soap/http"/>
<wsdl:operation name="getCaseId">
  <soap:operation soapAction="" style="document"/>
  <wsdl:input name="getCaseId">
    <soap:body use="literal"/>
  </wsdl:input>
  <wsdl:output name="getCaseIdResponse">
    <soap:body use="literal"/>
  </wsdl:output>
</wsdl:operation>
</wsdl:binding>
<wsdl:service name="TestClassImplService">
<wsdl:port name="TestClassImplPort" binding="tns:TestClassImplServiceSoapBinding">
  <soap:address location="http://localhost:8080/rc_ccb/TestClass"/>
</wsdl:port>
</wsdl:service>
</wsdl:definitions>

当给定一个 SOAP 请求时，我得到了强制转换异常 [Lcom.org.ccb.test.SampleClass; 不能转换为 com.org.ccb.test.SampleClass

对于从 Web 服务获取对象数组，以下是 WSDL 定义对吗？

<xs:complexType name="getCaseIdResponse">  
<xs:sequence>  
<xs:element maxOccurs="unbounded" name="sampleClass" type="tns:sampleClass"/>  
</xs:sequence>  
</xs:complexType>  
<xs:complexType name="sampleClass">  
<xs:sequence>  
<xs:element maxOccurs="1" name="caseid" type="xs:string"/>  
<xs:element maxOccurs="1" name="dummy" type="xs:string"/>  
</xs:sequence>  
</xs:complexType>

服务器：JBoss eap 5.1

任何的想法？

堆栈跟踪

14:31:46,743 WARNING [PhaseInterceptorChain] Interceptor for {http://test.ccb.org.com  /}TestClassImplService#{http://test.ccb.org.com/}getCaseId has thrown exception, unwinding now
org.apache.cxf.interceptor.Fault: [Lcom.org.ccb.test.SampleClass; cannot be cast to   com.org.ccb.test.SampleClass
at   org.apache.cxf.jaxws.interceptors.WrapperClassOutInterceptor.handleMessage(WrapperClassOutInterceptor.java:119)
at  org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:243)
at org.apache.cxf.interceptor.OutgoingChainInterceptor.handleMessage(OutgoingChainInterceptor.java:76)
at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:243)
at org.apache.cxf.transport.ChainInitiationObserver.onMessage(ChainInitiationObserver.java:109)
at org.apache.cxf.transport.servlet.ServletDestination.invoke(ServletDestination.java:98)
at org.apache.cxf.transport.servlet.ServletController.invokeDestination(ServletController.java:406)
at org.jboss.wsf.stack.cxf.ServletControllerExt.invoke(ServletControllerExt.java:173)
at org.jboss.wsf.stack.cxf.RequestHandlerImpl.handleHttpRequest(RequestHandlerImpl.java:61)
at org.jboss.wsf.stack.cxf.CXFServletExt.invoke(CXFServletExt.java:163)
at org.apache.cxf.transport.servlet.AbstractHTTPServlet.handleRequest(AbstractHTTPServlet.java:179)
at org.apache.cxf.transport.servlet.AbstractHTTPServlet.doPost(AbstractHTTPServlet.java:103)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at org.apache.cxf.transport.servlet.AbstractHTTPServlet.service(AbstractHTTPServlet.java:159)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:235)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:183)
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:95)
at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.process(SecurityContextEstablishmentValve.java:126)
at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:70)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:330)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:829)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:598)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:451)
at java.lang.Thread.run(Thread.java:662)
  Caused by: java.lang.ClassCastException: [Lcom.org.ccb.test.SampleClass; cannot be cast to com.org.ccb.test.SampleClass
at   com.org.ccb.test.jaxws.GetCaseIdResponse_WrapperTypeHelper1.createWrapperObject(Unknown Source)
at  org.apache.cxf.jaxws.interceptors.WrapperClassOutInterceptor.handleMessage(WrapperClassOutInterceptor.java:103)
... 33 more

** 主要编辑 ** 创建 Web 服务向导生成了 esdl 文件，但它不包含 maxOccurs="unbounded" ，所以我手动添加、保存并重新启动，以为它会改变，但发现 wsdl 没有改变它保留了旧的，所以应该是问题所在！找不到 wsdl 文件没有改变的原因！

score 0 · Accepted Answer

我认为 JBoss 生成的 WSDL 文件是错误的，代码如下

<xs:complexType name="getCaseId">
<xs:sequence>
<xs:element minOccurs="0" name="arg0" type="xs:string"/>
</xs:sequence>
</xs:complexType>

应该是这样的

<xs:complexType name="getCaseId">
<xs:sequence>
<xs:element minOccurs="0" maxOccurs="unbounded" name="arg0" type="xs:string"/>
</xs:sequence>
</xs:complexType>

默认maxOccurs属性值为 1，并且您的数组SimpleClass只是一个SingleClass导致类转换错误的实例（尝试将数组转换为实例）。

我没有使用 JBoss 工作室的经验，但我可以建议您使用一些集合而不是数组 - 也许 JBoss 可以比数组更好地处理集合。您也可以尝试 JAX-WS。

score 0 · Accepted Answer

您需要了解一些高级概念。

http://weblogs.java.net/blog/kohsuke/archive/2005/04/xmladapter_in_j.html

http://blog.bdoughan.com/2011/06/using-jaxbs-xmlaccessortype-to.html

http://docs.oracle.com/javaee/5/tutorial/doc/bnazf.html

我如何做到这一点，是要获得一个代表我的表/实体的类。然后我有一个 list_of_entities 的包装类；这是来自 Web 服务的返回。所以，总共：

具有所需注释的实体类
具有所需注释的包装类
具有所需注释的 Web 服务

我为下面的每一个提供了一个示例，它可能不会运行。他们只是为了给你一个理解。

//*********************** 1. your Object/Structure/table record you want to return

//since you'll like to send the object across thus it should be serializable
import java.io.Serializable;

//The following two imports are specific to your case. Read about them
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlType;

//The code related to the following classes is just to give you a taster of the JPA side of it
import javax.persistence.Table;
import javax.persistence.Column;
import javax.persistence.Id;
import javax.persistence.Entity;


/**
 *  The class that will be the Type of your list, I have used it as an entity too for the JPA Layer
 *
 */
@XmlType(namespace = "myNamespace")

@Entity
@Table(name="MY_TABLE"
    ,schema="MY_DB_SCHEMA"
)

public class SampleClass implements Serializable {

/**
 * 
 */
private static final long serialVersionUID = 1L;
protected String caseid;
protected String dummy;
/**
 * @return the dummy
 */
@XmlElement(namespace = "myNamespace")
@Column(name="TYPE", nullable=true, length=225) 
public String getDummy() {
    return dummy;
}
/**
 * @return the caseid
 */
@Id
@Column(name="TYPE", nullable=false, length=225)


@XmlElement(namespace = "myNamespace")

public String getCaseid() {
    return caseid;
}
/**
 * @param caseid the caseid to set
 */
public void setCaseid(String caseid) {
    this.caseid = caseid;
}
/**
 * @param dummy the dummy to set
 */
public void setDummy(String dummy) {
    this.dummy = dummy;
}

}

// * ** * ** * ** * ***2.对象包装类** * ** * ** * ** * ****

// This file was generated by the JavaTM Architecture for XML Binding(JAXB) Reference Implementation, v2.1-b02-fcs 
// See <a href="http://java.sun.com/xml/jaxb">http://java.sun.com/xml/jaxb</a> 
// Any modifications to this file will be lost upon recompilation of the source schema. 
// Generated on: 2009.02.12 at 12:55:08 PM GMT 
//
import java.util.ArrayList;
import java.util.List;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlType;

import YOURPACKAGE.SampleClass;

/**
 * Wrapper class for List, makes it possible for JAXB to marshal/unmarshal java.util.List.
 * 
 * @param <T>
 *          Generic List
 */
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "myListType", propOrder = { "listReturn" })
public class ExampleList {

  /**
   * instructing JAXB about the xml element and the name to use in the resulting xml structure.
   */
  @XmlElement(name = "sampleClass")
  protected List<SampleClass> listReturn;

  public ExampleList() {
    listReturn = new ArrayList<SampleClass>();
  }

  /**
   * @param local_list
   *          a generic list
   */
  public ExampleList(final List<SampleClass> local_list) {
    listReturn = local_list;
  }

  public List<SampleClass> getList() {
    return listReturn;
  }

}

// * ** * ** * ** * ** * ** * *

// * ** * ** * ***3.网络服务** * ** * ** * ** *

import javax.ejb.Stateless;
import javax.jws.WebMethod;
import javax.jws.WebParam;
import javax.jws.WebResult;
import javax.jws.WebService;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;



@Stateless(name = "myEJB")
@WebService(serviceName = "myService", targetNamespace = "mynamespace", name = "myServicePT", portName = "myServicePort")
public class ServiceImpl implements ServiceLocal {

  @SuppressWarnings("unused")
  private final Log log = LogFactory.getLog(ServiceImpl.class);

  @PersistenceContext(name = "MyContext")
  private EntityManager em;


  @WebMethod(operationName = "listAll")
  @WebResult(name = "myList", targetNamespace = "mynamespace")
  public ExampleList listAll() throws EastException {
    try {
      Query query = em.createNamedQuery("myQueryToGetMyListFromDB");
      return new ExampleList(query.getResultList());
    }
    catch (Exception e) {
      log.error("Error in retrieving  list", e);

    }
  }



}

// * ** * ***3.1 web服务本地接口* ** * ****

import javax.ejb.Local;

@Local
public interface ServiceLocal {
    ExampleList listAll();
}

// * ** * ** * ** * ** * ** * ** * ** * ****

score 0 · Accepted Answer

由于它是一个自下而上的服务，因此编辑 wsdl 是徒劳的，因此我从 wsdl（使用 JBoss Studio）生成了 java 框架类，并在实现类中编写了我的业务。现在服务运行良好。无论如何，我不知道为什么maxOccurs="unbounded"最初从 java 类生成 wsdl 时没有自动生成。谢谢大家的回复@gkzmin @mhan @dan

java - 测试 Web 服务时出现强制转换异常

3 回答 3

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