连接到远程heroku实例时neo4j休息graphdb挂起 [英] neo4j rest graphdb hangs when connecting to remote heroku instance

问题描述

  public class Test 
 {
 private static RestAPI rest = new RestAPIFacade（myIp，username，password）; 
 public static void main（String [] args）
 {
 Map< String，Object> foo = new HashMap< String，Object>（）; 
 foo.put（Test key，testing）; 
 rest.createNode（foo）; 
} 
} 
  

没有输出，只能连接无限期地挂起。

环境：

Eclipse
JDK 7

neo4j-rest-binding 1.9： https://github.com/neo4j/java-rest-binding

Heroku

任何想法为什么这只是挂起？

以下代码工作：

  public class Test b $ b {
 private static RestAPI rest = new RestAPIFacade（myIp，username，password）; 
 public static void main（String [] args）
 {
 Node node = rest.getNodeById（1）; 
 
 
 
 
 $ b $ p 
 $ b因此它表明我可以正确地检索远程值。 
解决方案
我想这是由于交易的使用不足造成的。默认情况下，neo4j-rest-binding将多个操作合并成一个请求（又名一个事务）。有两种方法可以解决这个问题：通过设置
 <$ 
 $ b 
 
 
将交易行为更改为1操作= 1交易 c $ c> -Dorg.neo4j.rest.batch_transaction = false 为您的JVM。请注意，这可能会影响性能，因为每个原子操作都是单独的REST请求。
 
 
在您的代码中使用事务：
 
 
 
  
  RestGraphDatabse db = new RestGraphDatabase（http：// localhost：7474 / db / data ，用户名密码）; 
 Transaction tx = db.beginTx（）; 
尝试{
 Node node = db.createNode（）; 
 node.setPropery（key，value）; 
 tx.success（）; 
} finally {
 tx.finish（）; 
} 
  
 
public class Test  
{  
       private static RestAPI rest = new RestAPIFacade("myIp","username","password");  
       public static void main(String[] args)
       {
              Map<String, Object> foo = new HashMap<String, Object>();
          foo.put("Test key", "testing");
              rest.createNode(foo);  
       }
}  
No output it just hangs on connection indefinitely.  


Environment:

Eclipse
JDK 7

neo4j-rest-binding 1.9: https://github.com/neo4j/java-rest-binding

Heroku

Any ideas as to why this just hangs?

The following code works:  
 public class Test  
    {  
           private static RestAPI rest = new RestAPIFacade("myIp","username","password");  
           public static void main(String[] args)
           {
                        Node node = rest.getNodeById(1);
           }
    }  
So it stands that I can correctly retrieve remote values.
解决方案
I guess this is caused by lacking usage of transactions. By default neo4j-rest-binding aggregates multiple operations into one request (aka one transaction). There are 2 ways to deal with this:

change transactional behaviour to "1 operation = 1 transaction" by setting 
-Dorg.neo4j.rest.batch_transaction=false for your JVM. Be aware this could impact performance since every atomic operation is a seperate REST request.
use transactions in your code:
.
RestGraphDatabse db = new RestGraphDatabase("http://localhost:7474/db/data",username,password);
Transaction tx = db.beginTx();
try {
    Node node = db.createNode();
    node.setPropery("key", "value");
    tx.success();
} finally {
    tx.finish();
}


                        
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