java.lang.NoClassDefFoundError：组织/阿帕奇/日志/ log4j的/记录器

Question

我想在Elasticsearch进行单元测试，我使用Java-test-framework
我使用Elasticsearch-1.6.0 并参照这些链接，帮助 https://www.elastic.co/guide/en/elasticsearch/reference/1.6/using-elasticsearch-test-classes.html https://github.com/elastic/elasticsearch/blob/master/core/src/test/java/org/elasticsearch/action/search/SearchRequestBuilderTests.java

这里是代码

class CampaignESTest extends ESTestCase { 

    def getCLient():MockTransportClient={ 
    val settings = Settings.builder() 
       .put(Environment.PATH_HOME_SETTING.getKey(), Files.createTempDir().toString()) 
       .build(); 
    val client = new MockTransportClient(settings); 
    client 
    } 
} 

class CampaignTestSearch extends PlaySpec{ 
    val client=new CampaignESTest 

val response = client.prepareSearch("dbtest") 
     .setTypes(CAMPAIGN_COLLECTION_NAME) 
     .setSearchType(SearchType.DFS_QUERY_THEN_FETCH) 
     .addFields("uuid","campaignName","artworkID","activationDate","_source") 
     .setQuery(query) 
     .execute() 
     .actionGet() 
    } 

我得到这个例外

DeferredAbortedSuite: 
[info] Exception encountered when attempting to run a suite with class name: org.scalatest.DeferredAbortedSuite *** ABORTED *** 
[info] java.lang.NoClassDefFoundError: org/apache/logging/log4j/Logger 
[info] at org.elasticsearch.common.logging.Loggers.getLogger(Loggers.java:101) 
[info] at org.elasticsearch.bootstrap.Bootstrap.initializeNatives(Bootstrap.java:92) 
[info] at org.elasticsearch.bootstrap.BootstrapForTesting.<clinit>(BootstrapForTesting.java:78) 
[info] at org.elasticsearch.test.ESTestCase.<clinit>(ESTestCase.java:138) 
[info] at testcontrollers.campaign.CampaignTestSerach.<init>(CampaignTestSerach.scala:40) 
[info] at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) 
[info] at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) 
[info] at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) 
[info] at java.lang.reflect.Constructor.newInstance(Constructor.java:423) 
[info] at java.lang.Class.newInstance(Class.java:442) 
[info] ... 
[info] Cause: java.lang.ClassNotFoundException: org.apache.logging.log4j.Logger 
[info] at java.net.URLClassLoader.findClass(URLClassLoader.java:381) 
[info] at java.lang.ClassLoader.loadClass(ClassLoader.java:424) 
[info] at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331) 
[info] at java.lang.ClassLoader.loadClass(ClassLoader.java:357) 
[info] at org.elasticsearch.common.logging.Loggers.getLogger(Loggers.java:101) 
[info] at org.elasticsearch.bootstrap.Bootstrap.initializeNatives(Bootstrap.java:92) 
[info] at org.elasticsearch.bootstrap.BootstrapForTesting.<clinit>(BootstrapForTesting.java:78) 
[info] at org.elasticsearch.test.ESTestCase.<clinit>(ESTestCase.java:138) 
[info] at testcontrollers.campaign.CampaignTestSerach.<init>(CampaignTestSerach.scala:40) 
[info] at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) 
[info] ... 
[error] Uncaught exception when running testcontrollers.campaign.CampaignTestSerach: java.lang.NoClassDefFoundError: org/apache/logging/log4j/Logger 

得到这条线上

val client=new CampaignESTest 

类异常CampaignTestSearch

这里有依赖关系build.sbt文件

"org.slf4j" % "slf4j-api" % "1.6.4", 
       "org.elasticsearch" % "elasticsearch" % "1.6.0", 
       "org.elasticsearch.test" % "framework" % "5.0.0" % "test", 
       "org.apache.lucene" % "lucene-test-framework" % "4.10.4" % "test", 
       "com.carrotsearch.randomizedtesting" % "randomizedtesting-runner" % "1.6.0" % "test", 
       "org.apache.lucene" % "lucene-codecs" % "4.10.4" % "test", 
       "org.apache.logging.log4j" % "log4j-core" % "2.8.2" , 
"org.apache.lucene" % "lucene-expressions" % "4.10.4", 

我怀疑异常的原因可能是由于一些版本的依赖关系任何人都可以请帮助正确的库依赖版本，使其工作或是再别的东西，我很想念

编辑 去除 “测试”，从 “org.apache.logging.log4j” ％ “的log4j核” ％ “2.8.2” 更新build.sbt

"org.slf4j" % "slf4j-api" % "1.6.4", 
       "org.elasticsearch" % "elasticsearch" % "1.6.0", 
       "org.elasticsearch.test" % "framework" % "5.0.0" % "test", 
       "org.apache.lucene" % "lucene-test-framework" % "4.10.4" % "test", 
       "com.carrotsearch.randomizedtesting" % "randomizedtesting-runner" % "1.6.0" % "test", 
       "org.apache.lucene" % "lucene-codecs" % "4.10.4" % "test", 
       "org.apache.logging.log4j" % "log4j-core" % "2.8.2", 
       "org.apache.logging.log4j" % "log4j-slf4j-impl" % "2.8.2" , 
       "org.apache.lucene" % "lucene-expressions" % "4.10.4", 

Answer 1

，以解决您的问题，添加以下缺失的依赖性：

• org.apache.logging.log4j：log4j的-API：2.8.2

之外，没有直接关系的问题，添加以下的依赖，使自己的呼叫SLF4J API获得针对log4j2实施也：

• org.apache.logging.log4j：log4j的-SLF4J-IMPL：2.8.2

确保没有其他执行日志上存在的类路径。

请注意：我提出的“额外”建议是基于您希望将所有日志调用重定向到log4j，而不管您是调用slf4j api还是直接调用log4j。如果没有，请说明您希望使用哪种日志实施方式，因为那时OP列出的依赖关系也会丢失一些东西。

Answer 2

Caused By: Cause: java.lang.ClassNotFoundException: org.apache.logging.log4j.Logger错误表明JVM无法在您的项目或应用程序CLASSPATH中找到org.apache.log4j.Logger类。可能是错误的原因是缺少log4j.jar文件到你的项目或类路径。所以你需要使用下面的依赖：

<dependency> 
    <groupId>org.slf4j</groupId> 
    <artifactId>slf4j-api</artifactId> 
    <version>1.7.25</version> 
</dependency> 

<dependency> 
    <groupId>org.slf4j</groupId> 
    <artifactId>slf4j-log4j12</artifactId> 
<version>1.7.25</version> 
</dependency>