JAVAlang.NoClassDefFoundError:org/apache/logging/log4j/Logger

Question

我想在Elasticsearch中执行单元测试，因为我正在使用Java测试框架
我正在使用Elasticsearch-1.6.0，并参考这些链接获取帮助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

这是密码

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()
  }

我得到了这个例外

  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

这一行有例外吗

val client=new CampaignESTest

在类活动测试搜索

以下是build中的依赖项。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",

我怀疑导致异常的原因可能是由于某些版本的依赖关系。任何人都可以帮助正确的库依赖关系版本使其正常工作，或者我缺少了其他什么吗

编辑删除测试从org.apache.logging.log4j%log4j-core%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

引起：原因：java.lang.ClassNotFound异常：org.apache.logging.log4j。Logger错误表示，JVM无法找到org.apache.log4j。记录器类在您的项目或应用程序CLASSPATH.可能是错误的原因是丢失log4j.jar文件到您的项目或类路径.所以你需要使用以下依赖关系：

<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>

Answer 2

要解决问题，请添加以下缺少的依赖项：

• org.apache.logging.log4j： log4j-api： 2.8.2

除此之外，与问题没有直接关系，添加以下依赖项，以便您自己对slf4j api的调用也能直接指向log4j2实现：

• org.apache.logging.log4j： log4j-slf4j-impl： 2.8.2

确保类路径上没有其他日志实现。

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，无论您是调用slf4j api还是直接调用log4j。如果没有，请说明您想要哪个日志实现，因为OP列出的Dependedencies也缺少一些内容。