[Miles' Blog]

A permission problem during MRTG intallation|MRTG安装中的权限问题 [Permalink]

Mon Mar 05 14:10:13 CST 2007
Category [trouble shooting]

今天给136配置了MRTG服务，用来监控流量。由于安装过太多次，所以整个过程都很顺利。安装到位后启动时出现如下错误：

2007-03-05 13:39:49 -- ERROR: Skipping webupdates because rateup did not return anything sensible
2007-03-05 13:39:49 -- WARNING: rateup died from Signal 0
 with Exit Value 1 when doing router '127.0.0.1_16777219'
 Signal was 0, Returncode was 1
2007-03-05 13:39:49 -- ERROR: Skipping webupdates because rateup did not return anything sensible
2007-03-05 13:39:49 -- WARNING: rateup died from Signal 0
 with Exit Value 1 when doing router '127.0.0.1_16777220'
 Signal was 0, Returncode was 1

firefox wmlbrowser extension的select bug终于解决了 [Permalink]

Thu May 26 16:20:49 CST 2005
Category [trouble shooting]

bug#9321, "Data from select/option fields are not sent"终于在0.6.9版被shoot down了，大快人心啊！！

这个extension许久都没有动作了，0.6.8还是年初的版本。hoho~~ 难道和我不懈的骚扰有关系？前段时间和Project Owner[Matthew Wilson]通过信催这个问题，他当时的回答居然是：

Sorry about that, I'd forgotten about it to be honest. I'll try and sort
something out soon.

Matthew

cvs错误：cannot find .: No such file or directory [Permalink]

Tue May 10 09:47:22 CST 2005
Category [trouble shooting]

服务器重整以后，cvs update/commit时候会出现如下错误提示：
cvs server: cannot open directory . for empty check: Invalid argument
虽然不影响使用，但是却很让人不爽。

而chacl时候，则是：
cvs [server aborted]: cannot find .: No such file or directory
干脆就直接出错。研究了一下cvsnt里面的设置，感觉应该只和cvsroot及temp目录有关——毕竟只用到这两个目录而已。检查之后发现winnt/temp没有对cvsuser这个系统帐号的权限。设置之后问题解决。

虽然cvsuser只是一个停用了的cvs用户绑定帐号，但是权限管理方面仍然遵循着ntfs的规则。这么说来停用的意义应该仅仅是限制登录。

JTDS: A bug while preforming full-text search [Permalink]

Tue Apr 19 15:29:59 CST 2005
Category [trouble shooting]

When took JTDS as MSSQL jdbc driver and did a pre-query like this:
select * from tbltopic where contains(topic, ?)
we got a SQLException saying:
...ResultSet is TYPE_FORWARD_ONLY...
And this exception did not come up while using a regular sql statement:
select * from tbltopic where contains(topic, '+keyword+')

Is this a bug or something of JTDS?

d-o-e PI以及奇怪的namespace问题 [Permalink]

Fri Mar 25 19:16:40 CST 2005
Category [trouble shooting]

在xslt中，经常有需要保留<>，不把它替换成&lt;&gt;的需求。比如今天就遇到了需要在xslt中利用xalan调用java static method，生成部分wml代码的情况。按规范上说，只需要用

<xsl:value-of disable-output-escaping="yes" select="string('<')"/>

<?javax.xml.transform.disable-output-escaping?>

<xsl:stylesheet 
  version="1.0" 
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  xmlns:funcs="xalan://com.yupstudio.app.downwap.common.util.XSLTFuncs">

  <xsl:output 
    method="wml" 
    omit-xml-declaration="no" 
    indent="no" 
    doctype-public="-//WAPFORUM//DTD WML 1.3//EN"
    doctype-system="http://www.wapforum.org/DTD/wml13.dtd" />
......

<wml 
  xmlns:funcs="xalan://com.yupstudio.app.downwap.common.util.XSLTFuncs">

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:funcs="xalan://com.yupstudio.app.downwap.common.util.XSLTFuncs">

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:funcs="xalan://com.yupstudio.app.downwap.common.util.XSLTFuncs"
xmlns:digest="xalan://com.yupstudio.app.downwap.common.util.DigestUtil">

<xmlns:digest="xalan://com.yupstudio.app.downwap.common.util.DigestUtil">

一个奇怪的中文编码问题的粗暴解决办法 [Permalink]

Fri Jan 21 08:14:45 CST 2005
Category [trouble shooting]

老系统中文编码有问题。如果不设置contentType为text/html; charset=gb2312，则虽然是html源文件是中文，但是需要更改IE的charset设置（这时候实际上察看http header看到的contentType是text/html; charset=iso8859-1）；如果设置了contentType为gb2312，则html源里面的中文直接成了???。

这个老系统当时运行于jdk1.3+tomcat3下，当时就不知道是那根筋不对，怎么都搞不定，最后套了一个客户端包IE，强制了编码才掩盖了问题。现在3年多过去了，怎么也得长点本事吧？于是就开始想尽办法折腾。试过了所有的方法，包括设置filter，给html加所有相关的，甚至包括设置jb的默认字符集，都完全无效。实在气不过，甚至反编译了tomcat的HttpServletResponse、JspWriter等的实现代码，一时也没看出门道。。

最后，心一横，给问题定了性：不就是一个老系统么？咱不浪费那个时间，简单粗暴地解决问题就算搞完！下面就是暴力解决法：

public class HtmlMimeResponseWrapper extends HttpServletResponseWrapper {
  
  //....

  public PrintWriter getWriter() throws IOException {
    PrintWriter writer = super.getWriter();
    MyWriter myWriter = new MyWriter(writer);
    return myWriter;
  }

  //...
}

  class MyWriter extends PrintWriter {
    PrintWriter writer;

    public MyWriter(PrintWriter writer) {
      super(writer);
      this.writer = writer;
    }

    // 关键在这里！
    public void write(String buf) {
      String newbuf = null;
      try {
        newbuf = new String(buf.getBytes("iso-8859-1"));
      }
      catch (UnsupportedEncodingException ex) {
      }
      writer.write(newbuf);
    }

    public boolean checkError() {
      return writer.checkError();
    }

    public void print(Object obj) {
      writer.print(obj);
    }

    public void print(String s) {
      writer.print(s);
    }

    public void print(boolean b) {
      writer.print(b);
    }

    public void print(char c) {
      writer.print(c);
    }

    public void print(char[] s) {
      writer.print(s);
    }

    public void print(double d) {
      writer.print(d);
    }

    public void print(float f) {
      writer.print(f);
    }

    public void print(int i) {
      writer.print(i);
    }

    public void print(long l) {
      writer.print(l);
    }

    public void println() {
      writer.println();
    }

    public void println(Object x) {
      writer.println(x);
    }

    public void println(String x) {
      writer.println(x);
    }

    public void println(boolean x) {
      writer.println(x);
    }

    public void println(char x) {
      writer.println(x);
    }

    public void println(char[] x) {
      writer.println(x);
    }

    public void println(double x) {
      writer.println(x);
    }

    public void println(float x) {
      writer.println(x);
    }

    public void println(int x) {
      writer.println(x);
    }

    public void println(long x) {
      writer.println(x);
    }

    public void close() {
      writer.close();
    }

    public void flush() {
      writer.flush();
    }

    public void write(String str, int off, int len) {
      writer.write(str, off, len);
    }

    public void write(char[] cbuf) {
      writer.write(cbuf);
    }

    public void write(char[] cbuf, int off, int len) {
      String s=new String(cbuf, off, len);
      this.write(s);
    }

    public void write(int c) {
      writer.write(c);
    }
  }

mail.jar无法释放 [Permalink]

Thu Dec 09 10:04:51 CST 2004
Category [trouble shooting]

环境：win2k+tomcat5.0.24 我的webapp用到了java mail api。按理说每次上传新的xxx.war以后，tomcat会先清除现有的xxx目录，然后展开新war。可是我这个应用却出了问题：web-inf/lib/mail.jar无法删除，提示占用（其他的jar、jsp已经全部删掉了）！只有shutdown tomcat才可以删除并重新deploy。。

释放java mail资源的地方只有
transport.close();
不过以前也是这样的，似乎并没有问题。

究竟怎么回事儿啊？？去sun和google转了好大一圈，还是无解。。。

firefox和ie对于<input type=file>的不同处理 [Permalink]

Tue Dec 07 14:27:08 CST 2004
Category [trouble shooting]

传递过来的filename，IE会是全路径，而firefox则是文件名。因为这个前两天还搞出来一个bug。 其实按理说，后者更合理。因为对于server端，没有必要也没有权利得到客户端的文件完整路径信息。