Hibernate throws StreamCorruptedException: invalid stream header

Question

I have a class like this,

class SampleClass implements Serializable {
    String name;
    Serializable fieldName;
}

And another class like,

class AnotherClass implements Serializable {
    SampleClass sampleClass;
}

where both class has their getter and setter methods.

In the main class, I'm getting the sampleClass variable from getter function, and trying to use the sampleClass objects. But when I'm using that, I encounter the error like, could not deserialize.

How to access the members of SampleClass, or shall we have field members of type Serializable ?

Thanks.

---

Edited: I am using hibernate, which uses many to one relation between aemploye and aaddress tables.

I created the Hibernate configuration file, and Reverse engineering file in net beans, for the above two tables.

Then I generated the POJO class.

The class and xml are:

Aaddress.hbm.xml

<hibernate-mapping>
<class name="hibernatetutor.tablebeans.Aaddress" table="aaddress" schema="public">
    <id name="sno" type="int">
        <column name="sno" />
        <generator class="assigned" />
    </id>
    <property name="street" type="serializable">
        <column name="street" />
    </property>
    <set name="aemployes" inverse="true">
        <key>
            <column name="address" />
        </key>
        <one-to-many class="hibernatetutor.tablebeans.Aemploye" />
    </set>
</class>

Aemploye.hbm.xml

<hibernate-mapping>
<class name="hibernatetutor.tablebeans.Aemploye" table="aemploye" schema="public">
    <id name="id" type="int">
        <column name="id" />
        <generator class="assigned" />
    </id>
    <many-to-one name="aaddress" class="hibernatetutor.tablebeans.Aaddress" fetch="select">
        <column name="address" />
    </many-to-one>
    <property name="name" type="string">
        <column name="name" />
    </property>
</class>

Aaddress.java

public class Aaddress implements java.io.Serializable {

    private int sno;
    private Serializable street;
    private Set aemployes = new HashSet(0);

    public int getSno() {
        return this.sno;
    }

    public void setSno(int sno) {
        this.sno = sno;
    }

    public Serializable getStreet() {
        return this.street;
    }

    public void setStreet(Serializable street) {
        this.street = street;
    }

    public Set getAemployes() {
        return this.aemployes;
    }

    public void setAemployes(Set aemployes) {
        this.aemployes = aemployes;
    }
}

Aemploye.java

public class Aemploye implements java.io.Serializable {

    private int id;
    private Aaddress aaddress;
    private String name;

    public int getId() {
        return this.id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public Aaddress getAaddress() {
        return this.aaddress;
    }

    public void setAaddress(Aaddress aaddress) {
        this.aaddress = aaddress;
    }

    public String getName() {
        return this.name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

Main.java

private void getData() {
    Session session = HibernateUtils.getInstance().openSession();
    Query query = session.createQuery("from Aemploye where id=:id");
    query.setParameter("id", 1);
    Aemploye a = (Aemploye) query.uniqueResult();
    Aaddress a1 = a.getAaddress();
    System.out.println(a1.getStreet());
}

The error is:

org.hibernate.type.SerializationException: could not deserialize
    at org.hibernate.util.SerializationHelper.deserialize(SerializationHelper.java:217)
    at org.hibernate.util.SerializationHelper.deserialize(SerializationHelper.java:240)
    at org.hibernate.type.SerializableType.fromBytes(SerializableType.java:82)
    at org.hibernate.type.SerializableType.get(SerializableType.java:39)
    at org.hibernate.type.NullableType.nullSafeGet(NullableType.java:163)
    at org.hibernate.type.NullableType.nullSafeGet(NullableType.java:154)
    at org.hibernate.type.AbstractType.hydrate(AbstractType.java:81)
    at org.hibernate.persister.entity.AbstractEntityPersister.hydrate(AbstractEntityPersister.java:2096)
    at org.hibernate.loader.Loader.loadFromResultSet(Loader.java:1380)
    at org.hibernate.loader.Loader.instanceNotYetLoaded(Loader.java:1308)
    at org.hibernate.loader.Loader.getRow(Loader.java:1206)
    at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:580)
    at org.hibernate.loader.Loader.doQuery(Loader.java:701)
    at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:236)
    at org.hibernate.loader.Loader.loadEntity(Loader.java:1860)
    at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:48)
    at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:42)
    at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:3044)
    at org.hibernate.event.def.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:395)
    at org.hibernate.event.def.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:375)
    at org.hibernate.event.def.DefaultLoadEventListener.load(DefaultLoadEventListener.java:139)
    at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:98)
    at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:878)
    at org.hibernate.impl.SessionImpl.immediateLoad(SessionImpl.java:836)
    at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:66)
    at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:111)
    at org.hibernate.proxy.pojo.cglib.CGLIBLazyInitializer.invoke(CGLIBLazyInitializer.java:150)
    at hibernatetutor.tablebeans.Aaddress$$EnhancerByCGLIB$$44bec229.getStreet(<generated>)
    at hibernatetutor.Main.getData(Main.java:33)
    at hibernatetutor.Main.main(Main.java:24)
Caused by: java.io.StreamCorruptedException: invalid stream header
    at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:753)
    at java.io.ObjectInputStream.<init>(ObjectInputStream.java:268)
    at org.hibernate.util.SerializationHelper$CustomObjectInputStream.<init>(SerializationHelper.java:252)
    at org.hibernate.util.SerializationHelper.deserialize(SerializationHelper.java:209)
    ... 29 more

Answer 1

On the basis of both the question, and some of the info from the comment section, I believe your troubles are caused by the following:

You have for some reason chosen the street attribute to be of type serializable. In your table this column has been defined as of type TEXT. Hibernate probably manages to save the serialized data to the column, but the database probably does not manage to keep them unaltered. Therefore, on retrieval, the now garbled serialized fail to deserialize.

The solution is, as Petr Pudlák noted, to get your mapping to be correct. If you choose a suitable binary type, such as BYTEA, then you will be able to store the binary data unaltered. The retrieval should then work.

This is not the right solution IMHO, which would be to choose a suitable data type in your java code in the first place. Having the type of street to be Serializable is confusing to anyone viewing your code. String would probably make more sense, and would also be a good fit for the column type TEXT.

Answer 2

I tried your classes, and it works for me:

import java.io.*;

class SampleClass implements Serializable {
      String name;
      Serializable fieldName;
}

class AnotherClass implements Serializable {
      SampleClass sampleClass;
}

public class Ser {
    public static void main(String argv[])
        throws Exception
    {
        SampleClass s = new SampleClass();
        s.name = "name";
        s.fieldName = "fieldName";

        AnotherClass a = new AnotherClass();
        a.sampleClass = s;

        // serialize the classes to a byte array
        ByteArrayOutputStream os = new ByteArrayOutputStream();
        ObjectOutputStream oos = new ObjectOutputStream(os);
        oos.writeObject(a);
        oos.close();

        // deserialize the classes from the byte array
        ObjectInputStream is
            = new ObjectInputStream(
                    new ByteArrayInputStream( os.toByteArray() ));
        a = (AnotherClass)is.readObject();
        is.close();

        // print something
        System.out.println(a.sampleClass.name);
    }
}

Can you post the exact code that causes the problem?

Answer 3

Using a getter doesn't involve serialization unless you have some very unusual framework to do this.

I suggest you look at the exact stack trace (and post it in the question) and see where the exception is actually occurring.