Unable to initialize main class, Caused by: java.lang.NoClassDefFoundError: com/mashape/unirest/http/exceptions/UnirestException [JAVA]

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英文:

Unable to initialize main class, Caused by: java.lang.NoClassDefFoundError: com/mashape/unirest/http/exceptions/UnirestException [JAVA]

问题

问题

在Eclipse中运行Maven的compileinstall命令以创建可执行的JAR文件,并尝试运行该JAR文件后,我收到以下错误信息:

Error: 无法初始化主类org.example.project.StockTracker` Caused by: java.lang.NoClassDefFoundError: com/mashape/unirest/http/exceptions/UnirestException

我完全不知道发生了什么。我该如何解决这个问题?以下是一些进一步的细节。我已经在POM中更新了主类信息,并将类路径设置为true

主类代码

package org.example.project;

import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.Unirest;
import com.mashape.unirest.http.exceptions.UnirestException;

public class StockTracker {
    
    public static void main (String[] args) throws UnirestException, InterruptedException  {
        HttpResponse<String> response = Unirest.get("https://apidojo-yahoo-finance-v1.p.rapidapi.com/market/get-quotes?region=US&lang=en&symbols=TSLA")
                    .header("x-rapidapi-host", "apidojo-yahoo-finance-v1.p.rapidapi.com")
                    .header("x-rapidapi-key", "api-key")
                    .asString();
        
        //System.out.println(response.getBody());
        System.out.println("response.getBody()");
    }
}

UNIREST异常类代码

package com.mashape.unirest.http.exceptions;

public class UnirestException extends Exception {

    private static final long serialVersionUID = -3714840499934575734L;

    public UnirestException(Exception e) {
        super(e);
    }

    public UnirestException(String msg) {
        super(msg);
    }
}

JAR文件中的MANIFEST文件

Manifest-Version: 1.0
Archiver-Version: Plexus Archiver
Created-By: Apache Maven 3.6.3
Built-By: Author
Build-Jdk: 13.0.1
Class-Path: unirest-java-1.4.9.jar httpclient-4.5.2.jar httpcore-4.4.4.j
 ar commons-logging-1.2.jar commons-codec-1.9.jar httpasyncclient-4.1.1.
 jar httpcore-nio-4.4.4.jar httpmime-4.5.2.jar json-20160212.jar
Main-Class: org.example.project.StockTracker
英文:

PROBLEM

After I run the Maven 'compile', 'install' command in Eclipse to create an executable JAR and proceed to run that JAR I get the below error

Error: Unable to initialize main class org.example.project.StockTracker`
Caused by: java.lang.NoClassDefFoundError: com/mashape/unirest/http/exceptions/UnirestException

I have no clue what is going on. How can I resolve this? Below are some further details. I updated the POM with the main-class information and set the classpath to 'true'.

MAIN CLASS CODE

package org.example.project;

import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.Unirest;
import com.mashape.unirest.http.exceptions.UnirestException;

public class StockTracker {
	
	public static void main (String[] args) throws UnirestException, InterruptedException  {
		HttpResponse&lt;String&gt; response = Unirest.get(&quot;https://apidojo-yahoo-finance-v1.p.rapidapi.com/market/get-quotes?region=US&amp;lang=en&amp;symbols=TSLA&quot;)
					.header(&quot;x-rapidapi-host&quot;, &quot;apidojo-yahoo-finance-v1.p.rapidapi.com&quot;)
					.header(&quot;x-rapidapi-key&quot;, &quot;api-key&quot;)
					.asString();
		
		//System.out.println(response.getBody());
		System.out.println(&quot;response.getBody()&quot;);
	}
}

UNIREST EXCEPTION CLASS CODE

package com.mashape.unirest.http.exceptions;

public class UnirestException extends Exception {

	private static final long serialVersionUID = -3714840499934575734L;

	public UnirestException(Exception e) {
		super(e);
	}

	public UnirestException(String msg) {
		super(msg);
	}

}

MANIFEST-FILE IN JAR

Manifest-Version: 1.0
Archiver-Version: Plexus Archiver
Created-By: Apache Maven 3.6.3
Built-By: Author
Build-Jdk: 13.0.1
Class-Path: unirest-java-1.4.9.jar httpclient-4.5.2.jar httpcore-4.4.4.j
 ar commons-logging-1.2.jar commons-codec-1.9.jar httpasyncclient-4.1.1.
 jar httpcore-nio-4.4.4.jar httpmime-4.5.2.jar json-20160212.jar
Main-Class: org.example.project.StockTracker

答案1

得分: 4

通过 @IlyaSenko 的帮助,我成功解决了问题。我需要将所有的 JAR 依赖项包含在我的实际 JAR 中,而不仅仅是在 POM 文件中声明依赖项。我更新了我的 POM 文件,使用以下内容实现了这一点..

<plugin>
      <artifactId>maven-assembly-plugin</artifactId>
      <configuration>
        <archive>
          <manifest>
            <mainClass>org.example.project.StockTracker</mainClass>
          </manifest>
        </archive>
        <descriptorRefs>
          <descriptorRef>jar-with-dependencies</descriptorRef>
        </descriptorRefs>
      </configuration>
</plugin>

然后使用 Maven 执行以下命令: "mvn clean compile assembly:single",这将所有的 JAR 文件捆绑到一个可执行的 JAR 文件中。之后 JAR 文件可以正常工作。

英文:

With the help of @IlyaSenko I managed to figure it out. I needed to include all my JAR dependencies within my actual JAR as opposed to simply declaring the dependency within my POM file. I updated my POM with the below to achieve this..

&lt;plugin&gt;
      &lt;artifactId&gt;maven-assembly-plugin&lt;/artifactId&gt;
      &lt;configuration&gt;
        &lt;archive&gt;
          &lt;manifest&gt;
            &lt;mainClass&gt;org.example.project.StockTracker&lt;/mainClass&gt;
          &lt;/manifest&gt;
        &lt;/archive&gt;
        &lt;descriptorRefs&gt;
          &lt;descriptorRef&gt;jar-with-dependencies&lt;/descriptorRef&gt;
        &lt;/descriptorRefs&gt;
      &lt;/configuration&gt;
&lt;/plugin&gt;

Then executed the following command using Maven "mvn clean compile assembly:single" which bundled all the JARs into one executable JAR. JAR worked after that.

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  • 本文由 发表于 2020年3月17日 03:29:08
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