glassfish / tomcat Java服务器加载类一次 [英] glassfish/tomcat Java Server load class once

问题描述

服务器启动后，我看到：

  sudo jmap -histo：live 14127 | grep KVStore 
 6222：1 24 xxx.xxx.KVStore 
  

经过一段时间的使用后，我得到：

  sudo jmap -histo：live 14127 | grep KVStore 
 7240：1 24 xxx.xxx.KVStore 
 7360：1 24 xxx.xxx.KVStore 
  

虽然我猜这与glassfish的扩展有关，但这实际上是有问题的，因为我使用KVStore作为内存存储类。

它是一个带有静态哈希表以及getter和setter的单例类：

  class KVStore 
 public static KVStore kvstore; 
 public Hashtable hash; 
  

现在问题在于一个类。当我打电话给商店，并得到一个servelet我收到对象就好了。但是，使用两个类或KVStore时，servelet在两者之间交替，并且在连续调用时永远不会正确返回。

现在我真的需要将对象存储在内存中。我如何强制这个类只能加载一次？或者创建一个全局可访问的哈希表？

最后一件事，我正在部署一个jruby warbled war文件。如果没有这种可能发生的实际方式，请告诉我们，我会进行调查。

解决方案

好的， FML。最有可能你想要这样：

  config.webxml.jruby.min.runtimes = 1 
 config.webxml.jruby .max.runtimes = 1 
  

放在warble.rb中，并称之为好。

I am using glassfish v2 but I've had the same problem in tomcat.

Once the server starts, I see:

sudo jmap -histo:live 14127 | grep KVStore
6222:             1             24  xxx.xxx.KVStore

After a while of usage, I get:

sudo jmap -histo:live 14127 | grep KVStore
7240:             1             24  xxx.xxx.KVStore
7360:             1             24  xxx.xxx.KVStore

While I'm guessing this has something to do with how glassfish scales out, this is really problematic because I use the KVStore as an in memory storage class.

It is a singleton class with a static hashtable and getters and setters:

class KVStore
    public static KVStore kvstore;
    public Hashtable hash;

Now the problem, is that with one class. When I call store and get with a servelet I receive the object just fine. But, with two classes or KVStore, the servelet alternates between the two and never returns correctly when the calls are made consecutively.

Now I really need to store the object in memory. How do I force this class to be loaded only once? Or create a Globally accessable hashtable?

One last thing, I am deploying a jruby warbled war file. If there is no actual way this could be happening, let me know and I'll look into that instead.

解决方案

Ok, fml. Most likely you want this:

config.webxml.jruby.min.runtimes = 1
config.webxml.jruby.max.runtimes = 1

in your warble.rb and call it good.

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