在Wildfly上通过Startup bean中的JMX通过AttributeNotFoundException

Question

大家好！ 我正在尝试通过Startup bean的@PostConstruct方法中的JMX加载wildfly服务器的系统属性。 部署开始时，它在已经启动的服务器实例上可以正常工作，但是在启动服务器实例引导时失败。

Wildfly 11.0.0.CR1启动Bean代码：

package ru.wildfly.test.ejb.wildflyconsulregistrar.startup;
import ru.wildfly.test.ejb.wildflyconsulregistrar.api.ConsulRegistrar;

import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import javax.ejb.Singleton;
import javax.ejb.Startup;
import javax.inject.Inject;

@Startup
@Singleton
public class WildflyConsulRegistrarStartupBean {

    @Inject
    private ConsulRegistrar consulRegistrar;

    @PostConstruct
    public void initialize() {
        registerServices();
    }

    private void registerServices() {
        consulRegistrar.registerService("WildflyTestCluster");
    }


    .............
}

ConsulRegistrar代码：

package ru.wildfly.test.ejb.wildflyconsulregistrar.impl;

import com.ecwid.consul.v1.ConsulClient;
import com.ecwid.consul.v1.agent.model.NewService;
import ru.test.ejb.wildflyconsulregistrar.api.ConsulRegistrar;
import ru.wildfly.test.ejb.wildflyconsulregistrar.serversettings.api.CurrentServerNodeSettings;

import javax.annotation.PostConstruct;
import javax.enterprise.context.Dependent;
import javax.inject.Inject;
import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.List;

@Dependent
public class ConsulRegistrarImpl implements ConsulRegistrar {

    ...............

    @Inject
    private CurrentServerNodeSettings currentServerNodeSettings;

    .............

    @Override
    public void registerService(String serviceName) {
        String currentNodeName = currentServerNodeSettings.getCurrentNodeName();
        ........................
    }

    .......................

}

CurrentServerNodeSettings代码：

package ru.wildfly.test.ejb.wildflyconsulregistrar.serversettings.impl;


import ru.wildfly.test.ejb.wildflyconsulregistrar.serversettings.api.CurrentServerNodeSettings;

import javax.enterprise.context.Dependent;
import javax.management.MBeanServer;
import javax.management.ObjectName;
import java.lang.management.ManagementFactory;

@Dependent
public class CurrentServerNodeSettingsWildflyImpl implements CurrentServerNodeSettings {

    ....................

    @Override
    public String getCurrentNodeName() {
        String currentNodeName =  getPlatformMBeanServerAttributeValue(String.class, "jboss.as:system-property=server.name", "value");
        return currentNodeName;
    }

    private <T> T getPlatformMBeanServerAttributeValue(Class<T> valueType, String objectName, String attributeName) {
        T attributeValue = null;

        try {
            MBeanServer mBeanServer = ManagementFactory.getPlatformMBeanServer();
            Object attributeObject = mBeanServer.getAttribute(new ObjectName(objectName), attributeName);

            attributeValue = attributeObject != null ? (valueType.cast(attributeObject)) : null;
        } catch (Exception ex) {
            throw new IllegalStateException(ex);
        }

        return attributeValue;
    }
}

错误信息：

Caused by: java.lang.IllegalStateException: 
javax.management.AttributeNotFoundException: 
"WFLYCTL0216: Management resource '[(\"system-property\" => \"server.name\")]' not found"
at ru.wildfly.test.ejb.wildflyconsulregistrar.serversettings.impl.CurrentServerNodeSettingsWildflyImpl
.getPlatformMBeanServerAttributeValue(CurrentServerNodeSettingsWildflyImpl.java:41)

我在jboss论坛https://developer.jboss.org/message/971717#971717上发现了相同的问题，但未得到解答。

有什么建议么？

Answer 1

这是启动过程中的依赖项问题，即在执行@PostConstruct方法后设置服务器名称。 第一次从应用程序访问服务器名称时，尝试加载服务器名称。

尽管定义了模块依赖性，但是在Wildfly中，没有通用的方法可以从应用程序强制执行部署顺序。 但这对您的情况无济于事。