log4j:WARN No appenders could be found for logger (org.apache.hadoop.util.Shell).log4j:WARN Please initialize the log4j system properly.log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info. 解决办法: 将/usr/local/hadoop/etc/h…
问题: 在Eclipse中运行Web项目Jsp网页启动Tomcat时提示端口被占用: Several ports (8005, 8080, 8009) required by Tomcat v9.0 Server at localhost are already in use. The server may already be running in another process, or a system process may be using the port. To start this…
1 package ttt; public class Testttt { public static void main() { Person p =new Person(); p.name="lucy"; p.age=12; p.sex=1; p.study(); int a = p.addAge(2); } } package ttt; public class Person { public String name; public int age; public int sex…
环境:Groovy/Grails Tool Suite 3.1.0.RELEASE(BASED ON ECLIPSE JUNO 3.8.1).JDK1.6 运行class的main方法,或启动junit测试时报Class not found错误,但是,指定的class明明是存在的并且已经编译成了.class文件. 出问题之前与解决方案: 1.报错前在项目中的该文件是可以正常运行的: 2.报错前为项目添加了maven配置,然后又删除掉了,*但错误也是自此开始的: 3.发现当前(出问题后)在项目中新…
使用Eclipse(版本Indigo 3.7)调试Java项目的时候,遇到了下面的错误: Exception in thread "main" Java.lang.OutOfMemoryError: PermGen space at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClassCond(Unknown Source) 很明显是内存溢出的错误,在Eclipse集…