Maven的Jena NoClassDefFoundError [英] Jena NoClassDefFoundError with Maven

问题描述

我有一个Java Maven项目，该项目是我前一段时间开发的，现在不再起作用.它使用了一个父pom以及另一个我认为已更改Jena版本的Maven项目，并且还使用了一个使用Jena的外部库. Maven依赖项是:

I have a Java Maven project that I developed a while ago and that doesn't work anymore. It uses a parent pom together with another Maven project in which I think the Jena version was changed and it also uses an external library that uses Jena. The Maven dependency is:

<dependency>
 <groupId>com.hp.hpl.jena</groupId>
 <artifactId>jena</artifactId>
 <version>2.6.4</version>
</dependency>

执行测试时，出现以下错误:

When I execute my tests I get the following errors:

• java.lang.NoClassDefFoundError:无法初始化类 com.hp.hpl.jena.query.ARQ
• java.lang.NoClassDefFoundError:org/apache/jena/iri/IRIFactory 在org.openjena.riot.system.PrefixMap.add(PrefixMap.java:54) 在com.hp.hpl.jena.sparql.util.MappingRegistry.addPrefixMapping(MappingRegistry.java:33) 在com.hp.hpl.jena.query.ARQ.init(ARQ.java:449)[...]

• java.lang.NoClassDefFoundError: Could not initialize class com.hp.hpl.jena.query.ARQ
• java.lang.NoClassDefFoundError: org/apache/jena/iri/IRIFactory at org.openjena.riot.system.PrefixMap.add(PrefixMap.java:54) at com.hp.hpl.jena.sparql.util.MappingRegistry.addPrefixMapping(MappingRegistry.java:33) at com.hp.hpl.jena.query.ARQ.init(ARQ.java:449) [...]

错误不是由我的代码直接引发的，而是由我所包含的库引发的.我可以通过在父pom中降级Jena版本来防止这种情况吗?

The errors are not thrown by my code directly but by the library I include. Can I prevent this by downgrading the Jena version in the parent pom or what can I do here?

P.S .:我现在有一个最小的代码示例来重现该错误(java.lang.NoClassDefFoundError:org/apache/jena/iri/IRIFactory):

P.S.: I now have a minimal code example that reproduces the error (java.lang.NoClassDefFoundError: org/apache/jena/iri/IRIFactory):

import org.junit.Test;
import com.hp.hpl.jena.query.ARQ;

public class DependencyTest
{
    @Test
    public void testARQ()
    {
        ARQ a = new ARQ();      
    }   
}

我想它来自于这种依赖性:

And I guess it comes from this dependency:

<dependency>
  <groupId>org.apache.jena</groupId>
  <artifactId>jena-arq</artifactId>
  <version>2.9.1-incubating-SNAPSHOT</version>
</dependency>

我知道可能是工厂而不是构造函数，但是我想这仍然可以说明问题出在哪里.

I know there is probably a factory instead of a constructor but I guess this still shows where the problem is.

P.S .:我注意到我有依赖项"jena"，"arq"和"jena-arq":

P.S.: I noticed that I had the dependencies "jena", "arq" and "jena-arq":

<dependency>
 <groupId>com.hp.hpl.jena</groupId>
 <artifactId>arq</artifactId>
 <version>2.8.8</version>
</dependency>

<dependency>
 <groupId>org.apache.jena</groupId>
 <artifactId>jena-arq</artifactId>
 <version>2.9.1-incubating-SNAPSHOT</version>
</dependency>

 dependency>
 <groupId>com.hp.hpl.jena</groupId>
 <artifactId>jena</artifactId>
 <version>2.6.4</version>
</dependency>

所以我想也许我有太多重叠的依赖项，并注释掉了"jena"和"arq".但是我仍然得到错误

So I thought maybe I have too much overlapping dependencies and commented out "jena" and "arq". But I still get the error

java.lang.NoClassDefFoundError: Could not initialize class com.hp.hpl.jena.query.ARQ
    at com.hp.hpl.jena.sparql.engine.http.QueryEngineHTTP.<init> [...]

我还尝试过强制使用非快照版本2.9.0进行孵化，但是无论是否使用"jena"和"arq"依赖性，我仍然会收到NoClassDefFoundError.

I also tried out forcing a non-snapshot-version 2.9.0-incubating, but then I still get the NoClassDefFoundError with and without using the "jena" and "arq"-dependencies.

P.P.S.:

即使使用以下依赖项，我仍然会遇到相同的错误:

I still get the same error even when I use the following dependencies:

 <dependency>
  <groupId>org.apache.jena</groupId>
  <artifactId>jena-arq</artifactId>
 <version>2.9.0-incubating</version>
</dependency>

<dependency>
  <groupId>org.apache.jena</groupId>
  <artifactId>jena-core</artifactId>
 <version>2.7.0-incubating</version>
</dependency>

<dependency>
  <groupId>org.apache.jena</groupId>
  <artifactId>jena-iri</artifactId>
 <version>2.7.0-incubating</version>
</dependency>

推荐答案

我终于解决了这个错误，排除了一些库中作为传递依赖而引入的"jena" -Dependency.

I finally resolved this error by excluding the "jena"-Dependency brought in as a transitive dependency from some library.

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