運行junit時出現異常class JSONTool { private static MipLogger logger = MipLogger.getLogger(MIPJsonTool.class); public Object fetch(String url) { return invokeEndPoint(url, 2000, new HashMap<String, String>()); }}我想測試這個類，下面是測試方法public void testFetchString() { JSONTool mipJsonTool = new JSONTool(); JSONTool mipJsonTool1 = Mockito.spy(mipJsonTool); Mockito.doReturn(new JSONObject() .put("status", 200)) .when(mipJsonTool1) .fetch("http://localhost:5000/author"); Object obj = mipJsonTool1.fetch("http://localhost:5000/author"); System.out.println("Done!");}運行junit給出以下異常java.lang.NoClassDefFoundError: org/apache/logging/log4j/util/ReflectionUtil Caused by: java.lang.ClassNotFoundException: org.apache.logging.log4j.util.ReflectionUtil
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TA貢獻1815條經驗 獲得超10個贊
NoClassDefFoundError是當 Java 運行時系統嘗試加載類的定義并且該類定義不再可用時引發的錯誤。所需的類定義在編譯時存在，但在運行時丟失。
檢查記錄器配置和您使用的 jar。
同時，您可以為 org.apache.logging.log4j.util.ReflectionUtil 提供缺少的依賴項
將 log4j 版本更改為 2.8.2 看看是否有幫助
//修改后的版本
我創建了一個具有以下配置的項目以使記錄器工作
構建.gradle
/*
* This file was generated by the Gradle 'init' task.
*
* This generated file contains a sample Java Library project to get you started.
* For more details take a look at the Java Libraries chapter in the Gradle
* user guide available at https://docs.gradle.org/5.0/userguide/java_library_plugin.html
*/
plugins {
// Apply the java-library plugin to add support for Java Library
id 'java-library'
}
repositories {
// Use jcenter for resolving your dependencies.
// You can declare any Maven/Ivy/file repository here.
jcenter()
}
dependencies {
// This dependency is exported to consumers, that is to say found on their compile classpath.
api 'org.apache.commons:commons-math3:3.6.1'
api 'org.apache.logging.log4j:log4j-web:2.8.2'
// This dependency is used internally, and not exposed to consumers on their own compile classpath.
implementation 'com.google.guava:guava:26.0-jre'
// Use JUnit test framework
testImplementation 'junit:junit:4.12'
}
在src/main/resources下創建一個log4j2.properties文件，其中包含以下條目以將日志顯示到控制臺
appender.console.type = Console
appender.console.name = STDOUT
rootLogger.level = debug
rootLogger.appenderRefs = stdout
rootLogger.appenderRef.stdout.ref = STDOUT
下面是調用記錄器的 Java 代碼（為了測試，我把它放在一個 main 方法中）
package GradleEclipseTestProject;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
public class GradleLog4jTest {
public static void main(String[] args) {
System.out.println("Testing log4j dependencies");
Logger logger = LogManager.getLogger();
logger.info("This is a sample logger");
}
}
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