在titan图中配置自定义属性序列化器时发生java.lang.IllegalStateException

Question

我正在尝试为泰坦图编写一个自定义java.util.Date序列化器。这里是我的泰坦配置文件：

attributes.allow-all = true 
attributes.custom.attribute1.attribute-class = java.util.Date 
attributes.custom.attribute1.serializer-class = com.serializer.MyDateSerializer 

和我的串行的样子：

public class MyDateSerializer implements AttributeSerializer<Date> { 
    @Override 
    public void verifyAttribute(Date value) { 
     // TODO Auto-generated method stub 
    } 
    @Override 
    public Date convert(Object value) { 
     // TODO Auto-generated method stub 
     return null; 
    } 
    @Override 
    public Date read(ScanBuffer buffer) { 
     // TODO Auto-generated method stub 
    } 
    @Override 
    public void write(WriteBuffer buffer, Date date) { 
     // TODO Auto-generated method stub 
    } 
} 

但打开TitanGraph后，我收到以下异常：

java.lang.IllegalStateException: Need to set configuration value: root.attributes.custom.serializer-class 
at com.google.common.base.Preconditions.checkState(Preconditions.java:177) 
at com.thinkaurelius.titan.diskstorage.configuration.ConfigOption.get(ConfigOption.java:158) 
at com.thinkaurelius.titan.diskstorage.configuration.BasicConfiguration.get(BasicConfiguration.java:56) 
at com.thinkaurelius.titan.graphdb.configuration.GraphDatabaseConfiguration.<init>(GraphDatabaseConfiguration.java:1334) 
at com.thinkaurelius.titan.core.TitanFactory.open(TitanFactory.java:91) 
at com.thinkaurelius.titan.core.TitanFactory.open(TitanFactory.java:71) 

这里是如何我试图从属性文件中读取配置：

 BaseConfiguration configuration = new BaseConfiguration(); 
     Properties properties = new Properties(); 
     properties.load(getClass().getResourceAsStream(
       "/titanConfiguration.properties")); 
     Set<Entry<Object, Object>> entrySet = properties.entrySet(); 

     for (Entry<Object, Object> entry : entrySet) { 
      configuration.setProperty(entry.getKey().toString(), entry 
        .getValue().toString()); 
     } 

我已经通过了0.5.2版本的泰坦图形文档，但Iam无法找出问题所在。我也经历了类似的帖子，但我仍然无法解决这个问题。有没有人遇到过这个问题？

如果我试图坚持巨头顶点内java.util.Date如下：

vertex.setProperty("myDate",new Date()); 

，然后当我尝试从顶点检索日期为：

((Date)vertex.getProperty("myDate")); 

我得到以下例外情况：

java.lang.ClassCastException: java.lang.String cannot be cast to java.util.Date 
at org.rampal.Transaction.getUsers(Transaction.java:179) 
at org.rampal.Controller.getUsers(Controller.java:71) 
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
at java.lang.reflect.Method.invoke(Method.java:483) 

Answer 1

您不能覆盖日期处理，因为已经存在泰坦包含默认处理程序。

使用您的指示，泰坦0.5.2你：

java.lang.IllegalArgumentException: DataType has already been registered: class java.util.Date 

你得到该错误消息是神秘的，除非我指定不以数字开头的自定义属性不会发生，我1.例如：

attributes.allow-all = true 
attributes.custom.attribute10.attribute-class = java.util.Date 
attributes.custom.attribute10.serializer-class = com.serializer.MyDateSerializer 

会造成：

java.lang.IllegalStateException: Need to set configuration value: root.attributes.custom.serializer-class