实现普罗米修斯计数器时的NoClassDefFoundError

Question

我实现了一个普罗米修斯计数器来得到。对服务的请求的数量。当我调用服务时，我得到了以下错误。

Exception in thread "HTTP-Listener I/O dispatcher-1" java.lang.NoClassDefFoundError: io/prometheus/client/Counter

我在pom.xml文件中添加了以下依赖项。

      <dependency>
         <groupId>io.prometheus</groupId>
         <artifactId>simpleclient</artifactId>
         <version>0.8.1</version>
     </dependency>
     <!-- Hotspot JVM metrics-->
     <dependency>
         <groupId>io.prometheus</groupId>
         <artifactId>simpleclient_hotspot</artifactId>
         <version>0.8.1</version>
     </dependency>
     <!-- Exposition HTTPServer-->
     <dependency>
         <groupId>io.prometheus</groupId>
         <artifactId>simpleclient_httpserver</artifactId>
         <version>0.8.1</version>
     </dependency>

这是我的java工具。

      private Counter requestsReceived;

      requestsReceived = Counter.build().name("requests_total_Sample").help("Total 
                                                       requests.").register();

      requestsReceived.inc(); 

我该如何解决这个问题？

Answer 1

你应该始终使用简单客户端的各个部分的一致版本。

<!-- prometheus - core -->
<dependency>
    <groupId>io.prometheus</groupId>
    <artifactId>simpleclient</artifactId>
    <version>${prometheus.version}</version>
</dependency>

<!-- prometheus - Exposition HTTPServer -->
<dependency>
    <groupId>io.prometheus</groupId>
    <artifactId>simpleclient_httpserver</artifactId>
    <version>${prometheus.version}</version>
</dependency>

<!-- Hotspot JVM metrics -->
<dependency>
    <groupId>io.prometheus</groupId>
    <artifactId>simpleclient_hotspot</artifactId>
    <version>${prometheus.version}</version>
</dependency>

<dependency>
    <groupId>io.prometheus</groupId>
    <artifactId>simpleclient_servlet</artifactId>
    <version>${prometheus.version}</version>
</dependency>

<!-- prometheus - Pushgateway exposition -->
<dependency>
    <groupId>io.prometheus</groupId>
    <artifactId>simpleclient_pushgateway</artifactId>
    <version>${prometheus.version}</version>
</dependency>