java - Hazelcast MBean 丢失

Question

我将一个应用程序迁移到 Spring Boot，包括从 XML 迁移到 Java 配置。该应用程序使用 Hazelcast 并且确实有效。但是，我在 JConsole 中看不到 Hazelcast MBean 了。我设法找到的关于启用 JMX 的唯一内容是属性

properties.put("hazelcast.jmx", true);

但这并没有帮助。这是迁移前的配置:

<hz:hazelcast id="hzInstance">
    <hz:config>
        <hz:group name="gsynth" password="gsynth"/>
        <hz:properties>
            <hz:property name="hazelcast.logging.type">slf4j</hz:property>
            <hz:property name="hazelcast.jmx">true</hz:property>
            <hz:property name="hazelcast.version.check.enabled">false</hz:property>
            <hz:property name="hazelcast.icmp.enabled">true</hz:property>
            <hz:property name="hazelcast.shutdownhook.enabled">true</hz:property>
            <hz:property name="hazelcast.max.operation.timeout">60000</hz:property>
            <hz:property name="hazelcast.restart.on.max.idle">true</hz:property>
        </hz:properties>
        <hz:network port="5701" port-auto-increment="false">
            <hz:join>
                <hz:multicast enabled="false"/>
                <hz:tcp-ip enabled="true">
                    <hz:members>${members.list}</hz:members>
                </hz:tcp-ip>
            </hz:join>
        </hz:network>
    </hz:config>
</hz:hazelcast>
<hz:map id="serviceHash" instance-ref="hzInstance" name="service-hash"/>
<hz:map id="persisterHash" instance-ref="hzInstance" name="persister-hash"/>

现在看起来像这样:

public class HazelcastConfig
{

    @Bean
    public HazelcastInstance hzInstance(Config hzConfig)
    {
        return Hazelcast.newHazelcastInstance(hzConfig);
    }

    @Bean
    public Config hzConfig(@Value("${members.list}") String membersList)
    {
        Properties properties = new Properties();
        properties.put("hazelcast.logging.type", "slf4j");
        properties.put("hazelcast.jmx", true);
        properties.put("hazelcast.version.check.enabled", false);
        properties.put("hazelcast.icmp.enabled", true);
        properties.put("hazelcast.shutdownhook.enabled", true);
        properties.put("hazelcast.max.operation.timeout", 60000);
        properties.put("hazelcast.restart.on.max.idle", true);

        return new Config().setGroupConfig(new GroupConfig().setName("gsynth").setPassword("gsynth")).setProperties(
                properties).setNetworkConfig(
                new NetworkConfig().setPort(5701).setPortAutoIncrement(false).setJoin(
                        new JoinConfig().setMulticastConfig(new MulticastConfig().setEnabled(false)).setTcpIpConfig(
                                new TcpIpConfig().setEnabled(true).addMember(membersList))));
    }

    @Bean
    public IMap serviceHash(HazelcastInstance hzInstance)
    {
        return hzInstance.getMap("service-hash");
    }

    @Bean
    public IMap persisterHash(HazelcastInstance hzInstance)
    {
        return hzInstance.getMap("persister-hash");
    }

}

感谢您的帮助!

Answer 1

最后，我发现了问题:问题是我使用的是这样的属性:

    Properties properties = new Properties();
    properties.put("hazelcast.logging.type", "slf4j");
    properties.put("hazelcast.jmx", true);
    ...

所以true被设置为 boolean 值。在内部，Hazelcast 的源代码在文件 GroupProperties.java 中变为 null。第 752 行:

String configValue = (config != null) ? config.getProperty(name) : null;

如果你深入挖掘，你会发现 config.getProperty(name)由于 Properties.java 第 969 行的这个奇特的东西，将返回 null文件(如 JDK 1.8.0_102 中所示):

Object oval = super.get(key);
String sval = (oval instanceof String) ? (String)oval : null;

oval在本例中对应于“hazelcast.jmx”键，因此为 true但按要求为 BOOLEAN 而不是 String。

修复方法很简单:

Properties properties = new Properties();
properties.put("hazelcast.logging.type", "slf4j");
properties.put("hazelcast.jmx", "true");
...

只需将所有非字符串值设置为字符串即可。

希望它能帮助别人!