语源科技BlogJava-JAVA AJAX C++http://www.blogjava.net/itspy/zh-cnThu, 05 Mar 2026 17:01:34 GMTThu, 05 Mar 2026 17:01:34 GMT60NoClassDefFoundError 与 ClassNotFoundException 区别http://www.blogjava.net/itspy/archive/2011/09/08/358258.htmlitspyitspyThu, 08 Sep 2011 00:59:00 GMThttp://www.blogjava.net/itspy/archive/2011/09/08/358258.htmlhttp://www.blogjava.net/itspy/comments/358258.htmlhttp://www.blogjava.net/itspy/archive/2011/09/08/358258.html#Feedback0http://www.blogjava.net/itspy/comments/commentRss/358258.htmlhttp://www.blogjava.net/itspy/services/trackbacks/358258.html当你通过字符串加载一个Class时,如果出错了就会抛出这个异常.比如.
  • The forName method in class Class.
  • The findSystemClass method in class ClassLoader.
  • The loadClass method in class ClassLoader


    • ClassNotFoundException
    如果程序在运行过程中,比如构造函数new一个对象时,触发加载操作了而没有找到对象.就会抛出这个异常.


    详情可以参考:
    http://stackoverflow.com/questions/1457863/what-is-the-difference-between-noclassdeffounderror-and-classnotfoundexception

    itspy 2011-09-08 08:59 发表评论
    ]]>    Maven下载Jar包同时下载source和javadochttp://www.blogjava.net/itspy/archive/2011/09/07/358233.htmlitspyitspyWed, 07 Sep 2011 13:02:00 GMThttp://www.blogjava.net/itspy/archive/2011/09/07/358233.htmlhttp://www.blogjava.net/itspy/comments/358233.htmlhttp://www.blogjava.net/itspy/archive/2011/09/07/358233.html#Feedback0http://www.blogjava.net/itspy/comments/commentRss/358233.htmlhttp://www.blogjava.net/itspy/services/trackbacks/358233.html 

    示例:
    mvn eclipse:eclipse -DdownloadSources -DdownloadJavadocs


    参考:
    http://stackoverflow.com/questions/310720/get-source-jar-files-attached-to-eclipse-for-maven-managed-dependencies

    http://piotrga.wordpress.com/2009/06/25/how-to-download-javadocs-or-sources-in-maven-2/

    mvn dependency:sources
    mvn dependency:resolve -Dclassifier=javadoc

     第一个命令去取所有在POM中的的source code,第二个去取Javadocs

     

    http://stackoverflow.com/questions/2059431/get-source-jars-from-maven-repository



    itspy 2011-09-07 21:02 发表评论
    ]]>    Hadoop笔记--Hadoop如何通过Bloom Filter提高Join性能http://www.blogjava.net/itspy/archive/2011/08/22/357076.htmlitspyitspyMon, 22 Aug 2011 13:43:00 GMThttp://www.blogjava.net/itspy/archive/2011/08/22/357076.htmlhttp://www.blogjava.net/itspy/comments/357076.htmlhttp://www.blogjava.net/itspy/archive/2011/08/22/357076.html#Feedback0http://www.blogjava.net/itspy/comments/commentRss/357076.htmlhttp://www.blogjava.net/itspy/services/trackbacks/357076.html
    1) 在Reduce阶段进行Join,这样运算量比较小.(这个适合被Join的数据比较小的情况下.)

    2) 压缩字段,对数据预处理,过滤不需要的字段.





      阅读全文

    itspy 2011-08-22 21:43 发表评论
    ]]>    JAVA里面的一个奇淫巧计(类似于匿名类)http://www.blogjava.net/itspy/archive/2011/08/12/356375.htmlitspyitspyFri, 12 Aug 2011 07:09:00 GMThttp://www.blogjava.net/itspy/archive/2011/08/12/356375.htmlhttp://www.blogjava.net/itspy/comments/356375.htmlhttp://www.blogjava.net/itspy/archive/2011/08/12/356375.html#Feedback0http://www.blogjava.net/itspy/comments/commentRss/356375.htmlhttp://www.blogjava.net/itspy/services/trackbacks/356375.html public String email="lilao#163.com";
    //下面这个代码符合语法吗?这段代码有实际用处吗?
    {System.out.println("Hello, I'm in Student: "+getClass());}

    }
      阅读全文

    itspy 2011-08-12 15:09 发表评论
    ]]>    JAXP throw Exception when validate XML with SAXhttp://www.blogjava.net/itspy/archive/2011/08/10/356262.htmlitspyitspyWed, 10 Aug 2011 10:12:00 GMThttp://www.blogjava.net/itspy/archive/2011/08/10/356262.htmlhttp://www.blogjava.net/itspy/comments/356262.htmlhttp://www.blogjava.net/itspy/archive/2011/08/10/356262.html#Feedback0http://www.blogjava.net/itspy/comments/commentRss/356262.htmlhttp://www.blogjava.net/itspy/services/trackbacks/356262.htmlException:Your JAXP provider [org.apache.crimson.jaxp.DocumentBuilderFactoryImpl @1ff7a1e] does not support XML Schema.

    只需要在特定目录添加一个文件:jaxp.properties
    内容如下
    javax.xml.parsers.DocumentBuilderFactory=com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderFactoryImpl
    javax.xml.parsers.SAXParserFactory=com.sun.org.apache.xerces.internal.jaxp.SAXParserFactoryImpl


    如果是Bea/jrockit可以添加到如下类似目录
    D:\bea\jrockit_160_05\jre\lib


    -Djavax.xml.parsers.DocumentBuilderFactory=com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderFactoryImpl
    -Djavax.xml.parsers.SAXParserFactory=com.sun.org.apache.xerces.internal.jaxp.SAXParserFactoryImpl


     



    itspy 2011-08-10 18:12 发表评论
    ]]>    Oracle 时区转换http://www.blogjava.net/itspy/archive/2009/12/15/306003.htmlitspyitspyTue, 15 Dec 2009 04:37:00 GMThttp://www.blogjava.net/itspy/archive/2009/12/15/306003.htmlhttp://www.blogjava.net/itspy/comments/306003.htmlhttp://www.blogjava.net/itspy/archive/2009/12/15/306003.html#Feedback0http://www.blogjava.net/itspy/comments/commentRss/306003.htmlhttp://www.blogjava.net/itspy/services/trackbacks/306003.html              EXTRACT(TIMEZONE_HOUR FROM SYSTIMESTAMP) / 24 +
                 TO_DATE('1970-01-01', 'yyyy-mm-dd')) from dual; 
     
     select new_time(sysdate,'PST','GMT') , sysdate  from dual;
     select new_time(sysdate,'PST','GMT')   from dual;
     


    Different ways to get the UTC time in Oracle and MSSQL
    http://weblogs.asp.net/vikram/archive/2008/05/14/different-ways-to-get-the-utc-time-in-oracle-and-mssql.aspx

    http://www.techonthenet.com/oracle/functions/new_time.php

    itspy 2009-12-15 12:37 发表评论
    ]]>    Excel 时间显示中文http://www.blogjava.net/itspy/archive/2009/08/07/290196.htmlitspyitspyFri, 07 Aug 2009 02:30:00 GMThttp://www.blogjava.net/itspy/archive/2009/08/07/290196.htmlhttp://www.blogjava.net/itspy/comments/290196.htmlhttp://www.blogjava.net/itspy/archive/2009/08/07/290196.html#Feedback0http://www.blogjava.net/itspy/comments/commentRss/290196.htmlhttp://www.blogjava.net/itspy/services/trackbacks/290196.html参考http://www.office-cn.net/vvb/thread-58977-1-1.html

    可以使用自定义格式来解决比如
     [$-409]yyyy-mm-dd
    就会显示
    2008-02-01

    如果需要其他格式,可以自己在调整一下就可.

    itspy 2009-08-07 10:30 发表评论
    ]]>    PSD转HTML & 定做Joomla模板http://www.blogjava.net/itspy/archive/2009/07/26/288452.htmlitspyitspySun, 26 Jul 2009 08:49:00 GMThttp://www.blogjava.net/itspy/archive/2009/07/26/288452.htmlhttp://www.blogjava.net/itspy/comments/288452.htmlhttp://www.blogjava.net/itspy/archive/2009/07/26/288452.html#Feedback0http://www.blogjava.net/itspy/comments/commentRss/288452.htmlhttp://www.blogjava.net/itspy/services/trackbacks/288452.html本人精通AJAX,CSS,XHTML,JavaScript.现承接如下两种业务:
    1)PSD转HTML/Webex页面
    2)Joomla模板的定做(需提供PSD文件).


    做出的页面完全基于XHTML(DIV, SPAN), 可完全兼容IE,FF,并搜索引擎友好.

    先验货,后付款.具体价格根据任务而定.

    Email: xjob360-css@yahoo.cn



    关键字:PSD, HTML, CSS, JAVAScript, XHTML,　Joomla, Template





     



    itspy 2009-07-26 16:49 发表评论
    ]]>    如何删除Windows Desktop Search http://www.blogjava.net/itspy/archive/2009/06/04/280043.htmlitspyitspyThu, 04 Jun 2009 09:21:00 GMThttp://www.blogjava.net/itspy/archive/2009/06/04/280043.htmlhttp://www.blogjava.net/itspy/comments/280043.htmlhttp://www.blogjava.net/itspy/archive/2009/06/04/280043.html#Feedback2http://www.blogjava.net/itspy/comments/commentRss/280043.htmlhttp://www.blogjava.net/itspy/services/trackbacks/280043.html

    http://www.davidarno.org/2007/10/26/how-to-remove-windows-desktop-search/

    itspy 2009-06-04 17:21 发表评论
    ]]>    VI 及 Shell 命令 大杂烩http://www.blogjava.net/itspy/archive/2009/02/07/253712.htmlitspyitspySat, 07 Feb 2009 08:34:00 GMThttp://www.blogjava.net/itspy/archive/2009/02/07/253712.htmlhttp://www.blogjava.net/itspy/comments/253712.htmlhttp://www.blogjava.net/itspy/archive/2009/02/07/253712.html#Feedback0http://www.blogjava.net/itspy/comments/commentRss/253712.htmlhttp://www.blogjava.net/itspy/services/trackbacks/253712.htmlcd -
    cd ~

    :set number
    :set nonumber


    :set hlsearch
    :set nohlsearch


    :set   autoindent

    Ctrl + U/P


    :!<command>  在VI时输入命令

    :r!<command>  在VI时输入命令，结果存入文档

    G

    gg

    dd/yy yank
    10dd
    vi复制多行文本的方法
    http://linux.chinaunix.net/techdoc/develop/2009/01/01/1056077.shtml

     

    Ctrl+b或左箭头键 　　　左移一个字符（移至前一个字符）

    Ctrl+f或右箭头键 　　　右移一个字符（移至后一个字符）

    Ctrl+a 　　　　　　　　　移至行首

    Ctrl+e 　　　　　　　　　移至行尾

    Ctrl+d 　　　　　　　　　删除光标所在处的字符

    BACKSPACE或Ctrl+h 　　删除光标左边的字符

    Ctrl+k 　　　　　　　　　删除至行尾

    ★命令行编辑/ http://www.examda.com/linux/fudao/20060928/154730410-4.html

     


    10G

    10S  替换多少行

    10s  替换多少个字符

    :g/generic/s//webhosting/g

     


    q: 调出command-line
    :his 显示历史命令
    http://alulax.blogspot.com/2007/03/vi-command-line-window.html


    .vimrc
    syntax on

     

    set autoindent
    set cindent
    set modeline
    set ruler
    set showcmd
    set showfulltag
    set showmode
    set smartcase
    set smartindent
    set imcmdline
    set previewwindow
    set hlsearch



    itspy 2009-02-07 16:34 发表评论
    ]]>