date:20090116

RE: Tomcat returns HTTP status of 200 when HttpServletResponse.sendError() called.

2009-01-16 Thread Caldarale, Charles R

> From: Nathan Potter [mailto:n...@opendap.org]
> Subject: Re: Tomcat returns HTTP status of 200 when
> HttpServletResponse.sendError() called.

> 
> docs
> /docs
> 

The above mapping is not useful; since it contains no wildcards, it can only be 
used as an exact match for the directory, and you've disabled directory 
listings.

> In my web.xml it simply doesn't work.

Are you seeing errors in the logs?  What are you trying that "doesn't work"?  
What errors are you seeing?

> It appears that no servlet is associated with
> /docs or /docs/*.

What leads you to that conclusion?

> Interestingly my IDE can't seem to find the class

Take the IDE out of the picture - run Tomcat by itself and see what happens.

 - Chuck


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Re: Tomcat returns HTTP status of 200 when HttpServletResponse.sendError() called.

2009-01-16 Thread Nathan Potter


Chuck et. al,

I tried the thing below, but Tomcat can't find the class:  
org.apache.catalina.servlets.DefaultServlet


On this page of the Tomcat docs:

http://tomcat.apache.org/tomcat-6.0-doc/default-servlet.html

There is good infrormation but when I put this:


docs
org.apache.catalina.servlets.DefaultServletservlet-class>


debug
0


listings
false

1


...


docs
/docs



docs
/docs/*




In my web.xml it simply doesn't work. It appears that no servlet is  
associated with /docs or /docs/*. Interestingly my IDE can't seem to  
find the class, although it is used in $CATALINA_HOME/conf/web.xml


Is there something else I need to do? Include or copy a jar file from  
somewhere?



Nathan



On Jan 14, 2009, at 9:20 PM, Caldarale, Charles R wrote:


From: Nathan Potter [mailto:n...@opendap.org]
Subject: Re: Tomcat returns HTTP status of 200 when
HttpServletResponse.sendError() called.

So do you mean something like this?

default

  org.apache.catalina.servlets.DefaultServlet

1


default
/err/*



Yes, but I think you're going to have to change the   
value to something else so it doesn't conflict with the one in conf/ 
web.xml that's shared by all webapps.  (It's been a while since I  
had to do this, but I seem to recall that was necessary to avoid  
ugly messages at startup.)



And I place all of my default error pages in
$CATALINA_HOME/webapps/myContext/err/


Yes.  You could also use the same technique to have the  
DefaultServlet handle other static content if you want.


- Chuck


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Re: PostgreSQL vs MySQL with Tomcat

2009-01-16 Thread Rusty Wright

Regarding MySQL's autoincrement type, it looks like PostgreSQL has something
similar:

http://www.postgresql.org/docs/8.3/interactive/datatype-numeric.html#DATATYPE-SERIAL

I'm in the process of migrating a MySQL database to PostgrSQL.

Christopher Schultz wrote:

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1

Ken,

Ken Bowen wrote:

Unfortunately, MySQL isn't really that tunable. On the other hand, MySQL
requires very little in the way of tuning!

This was my comment, and that's the gist I got from reading Zawodny's
and Balling's "High Performance MySQL" from O'Reilly. There are /some/
things you can tune, but not much. It's like an auto-adjusting clutch.
Sure, you can adjust it, but it's going to do a pretty good job on its own.

I created a couple of proof-of-concept projects with PostgreSQL for
someone about six months ago, and the only really puzzling thing what
how to set up "sequences" corresponding to MySQL's AUTOINCREMENT (I'm
not sure I've really wrapped head around it completely anyway). For
those small projects, it worked well, but there was no stress involved.

I have no experience with PostgreSQL, but I was always irritated by lack
of support (in previous JDBC specifications) for the AUTOINCREMENT
fields (fixed, of course, in JDBC 1.4 when Statement.getGeneratedKeys
was added). Oracle-style SEQUENCES always made more sense to me --
although they require an additional query to be issued every time you
want a new id, you can use them for anything; not just record PKs.

I think PostgreSQL has Oracle-style sequences. There are no
auto-incrementing PKs or anything like that: you first SELECT the next
value from the sequence, then use that as the PK for your INSERT that
you issue immediately afterward. If you don't need to capture the new id
from the code, you could probably even do this:

INSERT INTO my_table (id, ...)
VALUES ((SELECT next FROM my_sequence), ...)

I have no idea if that would even work. Give it a try!

I'd like to hear about people's experiences and what they think are the
strengths and weaknesses of each DBMS for use behind Tomcat.

MySQL has always had super good performance for me, especially using
MyISAM tables. The addition of InnoDB tables was great because you got
the relatively fast speed of MySQL (compared to, say, Oracle) with the
integrity you really expect from a production-quality RDBMS.

Since I'm not a DBA, I'm appreciated the fact that MySQL can often be a
fire-and-forget kind of service. It just doesn't need much care and
feeding. I remember my first job out of college required new engineering
hires to go through their one-box-wonder runbooks to make sure we
"understood how installs went and how the pieces fit together".
Installing Apache Jserv (yeah!), httpd, and most everything else took
about one or two printed pages of documentation. The rest of the runbook
was Oracle install and configuration. Install. Run the command-line
tool. Quit the command-line tool. Edit a config file. Re-run the
command-line tool. Create the database. Quit the command-line tool.
Change the rollback segment size. Etc. etc. etc. I never even understood
anything I was doing, and neither did the folks that were supervising
our execution of these tasks. These were just instructions that probably
worked for someone in the past, so they wrote them down and nobody ever
bothered to figure out if there were any better options. I was one of
the first engineers who used MySQL in a project that went to production
(and I had to implement my own pre-innodb manual rollback logic -- yikes!).

MySQL supports a lot of functions that are, of course, outside the SQL
standard, but are nonetheless useful. Here is what my MySQL driver
(Connector/J 5.0.8) reports for the functions available to the client
(server version is 5.0.70):

Supported functions:
Numeric:
ABS,ACOS,ASIN,ATAN,ATAN2,BIT_COUNT,CEILING,COS,COT,DEGREES,EXP,FLOOR,LOG,LOG10,MAX,MIN,MOD,PI,POW,POWER,RADIANS,RAND,ROUND,SIN,SQRT,TAN,TRUNCATE
String:
ASCII,BIN,BIT_LENGTH,CHAR,CHARACTER_LENGTH,CHAR_LENGTH,CONCAT,CONCAT_WS,CONV,ELT,EXPORT_SET,FIELD,FIND_IN_SET,HEX,INSERT,INSTR,LCASE,LEFT,LENGTH,LOAD_FILE,LOCATE,LOCATE,LOWER,LPAD,LTRIM,MAKE_SET,MATCH,MID,OCT,OCTET_LENGTH,ORD,POSITION,QUOTE,REPEAT,REPLACE,REVERSE,RIGHT,RPAD,RTRIM,SOUNDEX,SPACE,STRCMP,SUBSTRING,SUBSTRING,SUBSTRING,SUBSTRING,SUBSTRING_INDEX,TRIM,UCASE,UPPER
System:
DATABASE,USER,SYSTEM_USER,SESSION_USER,PASSWORD,ENCRYPT,LAST_INSERT_ID,VERSION
Time/Date:
DAYOFWEEK,WEEKDAY,DAYOFMONTH,DAYOFYEAR,MONTH,DAYNAME,MONTHNAME,QUARTER,WEEK,YEAR,HOUR,MINUTE,SECOND,PERIOD_ADD,PERIOD_DIFF,TO_DAYS,FROM_DAYS,DATE_FORMAT,TIME_FORMAT,CURDATE,CURRENT_DATE,CURTIME,CURRENT_TIME,NOW,SYSDATE,CURRENT_TIMESTAMP,UNIX_TIMESTAMP,FROM_UNIXTIME,SEC_TO_TIME,TIME_TO_SEC

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