通過JMX發布Bean時出錯

Question

我正在嘗試在JMX上注冊bean。 我在mbs.registerMBean(metadataObj, name);行上遇到錯誤mbs.registerMBean(metadataObj, name); 。 錯誤說

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

我不知道這是怎么回事。

該bean具有有關請求開始/結束時間的基本元數據。 類

    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

Answer 1

這里有很多問題。

從msb = ....開始，沒有方法....它必須存在於方法中。 接下來， 新的ObjectName（...）引發異常，因此您需要將其包裝在try / catch塊中。 另外，你確定你想創建RequestPerformanceMetadata 內 RequestPerformanceMetadata的另一個實例？ 也許您只想注冊此實例。

看一下這段代碼片段：

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