Question

我对Titan 0.5.1有疑问。我尝试将Titan 0.4.4升级到0.5.1。目前，我使用berkeleyje，我配置如下：

BaseConfiguration conf = new BaseConfiguration();

// Storage info
conf.setProperty("storage.directory", directory + File.separator + DB_NAME);
conf.setProperty("storage.backend", "berkeleyje");

// Class info storage
conf.setProperty("attributes.allow-all", "true");
conf.setProperty("attributes.custom.attribute1.attribute-class", "model.Property");
conf.setProperty("attributes.custom.attribute1.serializer-class", "PropertySerializer");

TitanGraph graph = TitanFactory.open(conf);

为了序列化我的对象我使用：

public class PropertySerializer implements AttributeSerializer<Property> {

    @Override
    public Property read(ScanBuffer buffer) {
        Property object = null;
        ArrayList<Byte> records = new ArrayList<Byte>();

        try {
            while (buffer.hasRemaining()) {
                records.add(Byte.valueOf(buffer.getByte()));
            }

            Byte[] bytes = records.toArray(new Byte[records.size()]);

            ByteArrayInputStream bis = new ByteArrayInputStream(ArrayUtils.toPrimitive(bytes));
            ObjectInput in = new ObjectInputStream(bis);
            object = (Property) in.readObject();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }

        return object;
    }

    @Override
    public void write(WriteBuffer out, Property attribute) {
        try {
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            ObjectOutput outobj;

            outobj = new ObjectOutputStream(bos);

            outobj.writeObject(attribute);
            byte[] propertybyte = bos.toByteArray();

            for (int i = 0; i < propertybyte.length; i++) {
                out.putByte(propertybyte[i]);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void verifyAttribute(Property value) {
        // TODO Auto-generated method stub

    }

    @Override
    public Property convert(Object value) {
        // TODO Auto-generated method stub
        return null;
    }

}

通常，我添加如下属性：

Vertex r = this.model.addVertex(null);
Property p = new Property();
r.setProperty("object", p);
this.model.commit();

但是我得到了这个错误：

线程中的异常＆＃34; main＆＃34; com.thinkaurelius.titan.core.TitanException：无法提交因持久性异常而导致的事务 com.thinkaurelius.titan.graphdb.transaction.StandardTitanTx.commit（StandardTitanTx.java:1310）在 com.thinkaurelius.titan.graphdb.blueprints.TitanBlueprintsGraph.commit（TitanBlueprintsGraph.java:60）引起：com.thinkaurelius.titan.core.TitanException：Serializer 限制：无法序列化类型：class的对象 .model.Property at com.thinkaurelius.titan.graphdb.database.serialize.StandardSerializer $ StandardDataOutput.writeClassAndObject（StandardSerializer.java:160）在 com.thinkaurelius.titan.graphdb.database.EdgeSerializer.writePropertyValue（EdgeSerializer.java:383）在 com.thinkaurelius.titan.graphdb.database.EdgeSerializer.writePropertyValue（EdgeSerializer.java:377）在 com.thinkaurelius.titan.graphdb.database.EdgeSerializer.writeRelation（EdgeSerializer.java:293）在 com.thinkaurelius.titan.graphdb.database.StandardTitanGraph.prepareCommit（StandardTitanGraph.java:485）在 com.thinkaurelius.titan.graphdb.database.StandardTitanGraph.commit（StandardTitanGraph.java:613）在 com.thinkaurelius.titan.graphdb.transaction.StandardTitanTx.commit（StandardTitanTx.java:1299）

你能帮帮我吗？因为，0.4.4版本有效。新文档对我没有帮助。

提前致谢

Titan 0.5.1自定义节点中的对象

0 个答案: