在Log4j 2.0中找到ClassNotFoundException [英] ClassNotFoundException found in Log4j 2.0

问题描述

im已为log4j12-api-beta2.jar设置了构建路径，但它提供了 出现以下错误，请帮助我解决此问题
我的代码如下 Java文件:

im already set the build path for log4j12-api-beta2.jar but it gives the following error please help me to solve this problem
my code is follows java file:

package com.sst.log4j;

 class Product {
private int productId;
private String productName;
public int getProductId() {
    return productId;
}
public void setProductId(int productId) {
    this.productId = productId;
}
public String getProductName() {
    return productName;
}
public void setProductName(String productName) {
    this.productName = productName;
}
public Product(int productId, String productName) {
    super();
    this.productId = productId;
    this.productName = productName;
}



 }

我的Main()文件是:

and my Main() file is:

 package com.sst.log4j;
import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;

public class ProductMain {

/**
 * @param args
 */
static Logger log=LogManager.getLogger(Product.class.getName());
public static void main(String[] args) {
    // TODO Auto-generated method stub
    Product p1=new Product(1,"garlands");
    System.out.println(p1.getProductName());
    log.error(p1.getProductName());

}

}

它给出以下异常:

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/logging/
 log4j/LogManager
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:791)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
at org.apache.log4j.LogManager.getLogger(LogManager.java:38)
at com.sst.log4j.ProductMain.main(ProductMain.java:14)
    Caused by: java.lang.ClassNotFoundException: org.apache.logging.log4j.LogManager
  at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
... 14 more

推荐答案

我刚刚从此处下载了log4j 2.0: http://logging.apache.org/log4j/2.x/download.html

I just downloaded log4j 2.0 from here: http://logging.apache.org/log4j/2.x/download.html

我还没有使用过它，但是看起来您可能在类路径上同时需要log4j-api-2.0-beta2.jar和log4j-core-2.0-beta2.jar.我猜想api jar是这样，您可以进行编译，并且核心包含实现.

I haven't used it yet, but looks like you probably need both log4j-api-2.0-beta2.jar as well as log4j-core-2.0-beta2.jar on the classpath. I'm guessing the api jar is so you can compile and the core contains the implementation.

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