java难以将实体实例从服务器转移到客户端
我有一个安卓客户端和一个谷歌应用引擎Servlet
我通过序列化将对象从客户端传输到服务器
序列化适用于我的项目中的所有序列化对象,
除了我保存在JPA数据库中的名为Profile的实体对象
现在,当我将配置文件实例从客户端传输到服务器时,它工作正常
但当我从服务器传输到客户端时,我得到了如下所示的异常
我要补充的是,我的代码中没有代码重复
概要文件类位于服务器项目中,客户端项目包含服务器的路径
W/System.err(1104): java.io.InvalidClassException: javax.jdo.identity.LongIdentity; Incompatible class (SUID): javax.jdo.identity.LongIdentity: static final long serialVersionUID =2472141538875317527L; but expected javax.jdo.identity.LongIdentity: static final long serialVersionUID =2940818939440220368L;
我的班是:
@Entity
public class Profile implements Serializable
{
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
private int age;
private String email;
private boolean onlineStatus = false;
public Profile() {}
public Profile(int age,String email)
{
super();
this.age = age;
this.email = email;
}
public int getAge()
{
return age;
}
public void setAge(int age)
{
this.age = age;
}
public String getEmail()
{
return email;
}
public void setEmail(String email)
{
this.email = email;
}
public boolean isOnlineStatus()
{
return onlineStatus;
}
public void setOnlineStatus(boolean onlineStatus)
{
this.onlineStatus = onlineStatus;
}
完整堆栈跟踪:
04-21 21:04:56.577: W/System.err(1104): at java.io.ObjectInputStream.verifyAndInit(ObjectInputStream.java:2697)
04-21 21:04:56.577: W/System.err(1104): at java.io.ObjectInputStream.readNewClassDesc(ObjectInputStream.java:1825)
04-21 21:04:56.592: W/System.err(1104): at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:811)
04-21 21:04:56.592: W/System.err(1104): at java.io.ObjectInputStream.readNewObject(ObjectInputStream.java:2039)
04-21 21:04:56.592: W/System.err(1104): at java.io.ObjectInputStream.readNonPrimitiveContent(ObjectInputStream.java:916)
04-21 21:04:56.592: W/System.err(1104): at java.io.ObjectInputStream.readObject(ObjectInputStream.java:2262)
04-21 21:04:56.592: W/System.err(1104): at java.io.ObjectInputStream.readObject(ObjectInputStream.java:2217)
04-21 21:04:56.592: W/System.err(1104): at java.io.ObjectInputStream.readNewArray(ObjectInputStream.java:1678)
04-21 21:04:56.592: W/System.err(1104): at java.io.ObjectInputStream.readNonPrimitiveContent(ObjectInputStream.java:914)
04-21 21:04:56.592: W/System.err(1104): at java.io.ObjectInputStream.readObject(ObjectInputStream.java:2262)
04-21 21:04:56.592: W/System.err(1104): at java.io.ObjectInputStream.readObject(ObjectInputStream.java:2217)
04-21 21:04:56.597: W/System.err(1104): at java.io.ObjectInputStream.readFieldValues(ObjectInputStream.java:1291)
04-21 21:04:56.597: W/System.err(1104): at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:518)
04-21 21:04:56.597: W/System.err(1104): at java.io.ObjectInputStream.readObjectForClass(ObjectInputStream.java:1535)
04-21 21:04:56.597: W/System.err(1104): at java.io.ObjectInputStream.readHierarchy(ObjectInputStream.java:1443)
04-21 21:04:56.597: W/System.err(1104): at java.io.ObjectInputStream.readNewObject(ObjectInputStream.java:2112)
04-21 21:04:56.597: W/System.err(1104): at java.io.ObjectInputStream.readNonPrimitiveContent(ObjectInputStream.java:916)
04-21 21:04:56.597: W/System.err(1104): at java.io.ObjectInputStream.readObject(ObjectInputStream.java:2262)
04-21 21:04:56.597: W/System.err(1104): at java.io.ObjectInputStream.readObject(ObjectInputStream.java:2217)
04-21 21:04:56.597: W/System.err(1104): at java.io.ObjectInputStream.readNewArray(ObjectInputStream.java:1678)
04-21 21:04:56.597: W/System.err(1104): at java.io.ObjectInputStream.readNonPrimitiveContent(ObjectInputStream.java:914)
04-21 21:04:56.597: W/System.err(1104): at java.io.ObjectInputStream.readObject(ObjectInputStream.java:2262)
04-21 21:04:56.607: W/System.err(1104): at java.io.ObjectInputStream.readObject(ObjectInputStream.java:2217)
04-21 21:04:56.607: W/System.err(1104): at java.io.ObjectInputStream.readFieldValues(ObjectInputStream.java:1291)
04-21 21:04:56.607: W/System.err(1104): at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:518)
04-21 21:04:56.607: W/System.err(1104): at java.io.ObjectInputStream.readObjectForClass(ObjectInputStream.java:1535)
04-21 21:04:56.607: W/System.err(1104): at java.io.ObjectInputStream.readHierarchy(ObjectInputStream.java:1443)
04-21 21:04:56.607: W/System.err(1104): at java.io.ObjectInputStream.readNewObject(ObjectInputStream.java:2112)
04-21 21:04:56.607: W/System.err(1104): at java.io.ObjectInputStream.readNonPrimitiveContent(ObjectInputStream.java:916)
04-21 21:04:56.607: W/System.err(1104): at java.io.ObjectInputStream.readObject(ObjectInputStream.java:2262)
04-21 21:04:56.607: W/System.err(1104): at java.io.ObjectInputStream.readObject(ObjectInputStream.java:2217)
04-21 21:04:56.607: W/System.err(1104): at streetMeet.Client.CustomHttpClient.readObject(CustomHttpClient.java:274)
04-21 21:04:56.607: W/System.err(1104): at streetMeet.Client.CustomHttpClient.executeHttpPost(CustomHttpClient.java:59)
04-21 21:04:56.607: W/System.err(1104): at streetMeet.Client.StreetMeetActivity.connectToServer(StreetMeetActivity.java:154)
04-21 21:04:56.607: W/System.err(1104): at streetMeet.Client.StreetMeetActivity.sendMessageToServer(StreetMeetActivity.java:141)
04-21 21:04:56.607: W/System.err(1104): at map.StreetMapActivity$1.run(StreetMapActivity.java:116)
# 1 楼答案
请注意,java对象序列化不能保证在不同的VM实现(本例中是GAE JVM和Android Dalvik)之间工作
您应该使用独立于平台的格式进行序列化。最流行的是JSON