如何修复因引发java.lang.IlLegalStateException而引发的Hazelcast：未为EntryProcessor启用用户代码部署 [英] How to fix Hazelcast from throwing 'java.lang.IllegalStateException: User Code Deployment is not enabled' for EntryProcessor

问题描述

我正在尝试使用EntryProcessor为我们的应用程序设置一个用于Hazelcast的代码。为了分析为什么EntryProcessor的代码在我们的应用程序中不起作用，我尝试在我的本地计算机上设置一个类似的示例来重现该问题。然而，即使在我可以复制相同的问题之前，我还面临着另一个问题，该问题应该如下所示：

1. 从here下载Hazelcast IMDG 3.10.6。然后将其解压缩。
2. 新建Java应用程序并添加main page的Java客户端-->EntryProcessor下给出的代码。
3. 将Hazelcast-3.10.6和Hazelcast-Client-3.10.6 Jars添加到解压缩的Hazelcast文件夹的lib文件夹下。
4. 从bin文件夹下的start.bat文件启动Hazelcast成员(服务器)。
5. 运行步骤2中给出的Java客户端代码。

我还粘贴了下面的Java客户端代码以供参考。

package client;
import com.hazelcast.client.HazelcastClient;
import com.hazelcast.client.config.ClientConfig;
import com.hazelcast.client.config.ClientUserCodeDeploymentConfig;
import com.hazelcast.core.HazelcastInstance;
import com.hazelcast.core.IMap;
import com.hazelcast.map.AbstractEntryProcessor;

import java.io.Serializable;
import java.util.Map;

public class EntryProcessorSample {

    public static class IncEntryProcessor extends AbstractEntryProcessor<String, Integer> implements Serializable {
        @Override
        public Object process(Map.Entry<String, Integer> entry) {
            // Get the value passed
            int oldValue = entry.getValue();
            // Update the value
            int newValue = oldValue + 1;
            // Update the value back to the entry stored in the Hazelcast Member this EntryProcessor is running on.
            entry.setValue(newValue);
            // No need to return anything back to the caller, we can return whatever we like here.
            return null;
        }
    }

    public static void main(String[] args) {
        // Enable Code Deployment from this Client classpath to the Cluster Members classpath
        // User Code Deployment needs to be enabled on the Cluster Members as well.
        ClientConfig config = new ClientConfig();
        ClientUserCodeDeploymentConfig userCodeDeploymentConfig = config.getUserCodeDeploymentConfig();
        userCodeDeploymentConfig.setEnabled(true);
        userCodeDeploymentConfig.addClass(EntryProcessorSample.IncEntryProcessor.class);
        // Start the Hazelcast Client and connect to an already running Hazelcast Cluster on 127.0.0.1
        HazelcastInstance hz = HazelcastClient.newHazelcastClient(config);
        // Get the Distributed Map from Cluster.
        IMap<String, Integer> map = hz.getMap("my-distributed-map");
        // Put the integer value of 0 into the Distributed Map
        map.put("key", 0);
        // Run the IncEntryProcessor class on the Hazelcast Cluster Member holding the key called "key"
        map.executeOnKey("key", new IncEntryProcessor());
        // Show that the IncEntryProcessor updated the value.
        System.out.println("new value:" + map.get("key"));
        // Shutdown this Hazelcast Client
        hz.shutdown();
    }
} 

我希望代码运行时没有任何问题，因为hazelcast site中给出的Java客户端的Map示例运行得很好。另外，由于我们显式启用了客户端配置的用户代码部署，我不明白为什么会出现此问题。

推荐答案

您也需要在成员端开启User Code Deployment。

这篇关于如何修复因引发java.lang.IlLegalStateException而引发的Hazelcast：未为EntryProcessor启用用户代码部署的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！