java - 通过JMX发布Bean时出错

我正在尝试在JMX上注册bean。我在行mbs.registerMBean(metadataObj, name);上遇到错误。错误说

Multiple markers at this line
    - Syntax error on token "(", delete
     this token
    - Syntax error on token ")", delete
     this token

我不知道这是怎么回事。

该bean具有有关请求开始/结束时间的基本元数据。
类

    package test.performance;

public class RequestPerformanceMetadata implements PerformanceMetadataMBean{

    private double startTime;
    private double endTime;
    private double timeTook;
    private String requestType;
    private int numOfRequests;

    PerformanceMetadataMBean metadataObj = new RequestPerformanceMetadata();

    MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
    ObjectName name = new ObjectName("test.performace:type=PerformanceMetadataMBean");

    mbs.registerMBean(metadataObj, name);

    public double getTimeTook() {
        return timeTook;
    }
    public void setTimeTook(double timeTook) {
        this.timeTook = timeTook;
    }

接口

package test.performance;

public interface PerformanceMetadataMBean {

    double getTimeTook();
    void setTimeTook(double timeTook);
    String getRequestType();
    void setRequestType(String requestType);

上

最佳答案

这里有很多问题。

从msb = ....开始，没有方法....它必须存在于方法中。
接下来，新的ObjectName（...）引发异常，因此您需要将其包装在try / catch块中。
另外，您确定要在RequestPerformanceMetadata内创建RequestPerformanceMetadata的另一个实例吗？也许您只想注册此实例。

看一下这段代码片段：

class RequestPerformanceMetadata implements PerformanceMetadataMBean {
    private double startTime;
    private double endTime;
    private double timeTook;
    private String requestType;
    private int numOfRequests;
    private MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
    private ObjectName name;

    public RequestPerformanceMetadata() {
        try {
            name = new ObjectName("test.performace:type=PerformanceMetadataMBean");
            mbs.registerMBean(this, name);
        } catch (Exception ex) {
            throw new RuntimeException("Yo dog. Bad object name", ex);
        }
    }
   //........... snip ...........
}