tag:blogger.com,1999:blog-100648382011-12-13T21:55:44.969-06:00A cancellable asynchronous computationBilly Bob Bainnoreply@blogger.comBlogger271100tag:blogger.com,1999:blog-10064838.post-34452394840882050562010-08-11T09:13:00.001-05:002010-08-11T09:13:59.337-05:00

I'm resurrecting FutureTask, to discuss mainly java and android development.

Billy Bob Bainnoreply@blogger.com0tag:blogger.com,1999:blog-10064838.post-30416451607115706922008-01-05T12:07:00.000-06:002008-01-05T12:09:19.333-06:00

Babbleknot reached 105,444 indexed message board forums this morning. The load process was paused to gather statistics.Some recent progressdefault landing page was redone to be simpler, load faster, and with more of an emphasis on searchsearch pagination implementedtotal search hits & execution time added to resultsthread preview with hit highlighting courtesy of Compassfixed bug with incorrect

Billy Bob Bainnoreply@blogger.com2tag:blogger.com,1999:blog-10064838.post-90649056859021675042007-12-03T00:26:00.001-06:002007-12-03T00:39:51.248-06:00

This was originally posted on the babbleknot.com blog.The babbleknot.com team has been gulping diet rockstar & busy adding new forums and features. Currently the board is loading at the rate of about 4,000 new forums per day, with a goal of 150,000 boards during the beta. Just now over half-way there with 78,184 forums loaded. I continue to be amazed at the variety of boards out there, and the

Billy Bob Bainnoreply@blogger.com0tag:blogger.com,1999:blog-10064838.post-81052969151397196962007-12-02T16:56:00.000-06:002007-12-02T16:57:26.246-06:00

This item originally ran on the babbleknot.com blog. Babbleknot.com is now open for a public beta.Babbleknot scans the index pages of over 70,000 message boards to generate thread / topic metrics. Things such as velocity, mass, acceleration to name a few. These metrics are used to generate input to a spider that indexes the content and generates graphs of the hot threads.Below is a sample graph

Billy Bob Bainnoreply@blogger.com0tag:blogger.com,1999:blog-10064838.post-28157125259106275472007-06-19T10:32:00.000-05:002007-06-19T10:33:45.186-05:00

From JavaOne 2007 in San Francisco.

Billy Bob Bainnoreply@blogger.com0tag:blogger.com,1999:blog-10064838.post-37508511166576599692007-02-16T06:44:00.000-06:002007-02-16T07:02:00.900-06:00

I picked this up in 1997 at the Java Internet Business Expo. It was held at Javits in NY & I remember McNealy spouting something about the 1st 100 days of Java. I know it was invented earlier... I am just telling you the marketing crap I heard that day. I looked on developer.com this morning & couldn't find it. If anyone has better luck, please comment.Looks like I forgot to eat lunch one day.

Billy Bob Bainnoreply@blogger.com1tag:blogger.com,1999:blog-10064838.post-16315026343277516532007-02-11T22:19:00.000-06:002007-02-11T22:49:07.693-06:00

I recently started playing with Greasemonkey under Firefox 2.0 & wrote this youtube video response viewer today. It is floating to towards the right side in this screenshot.All responses in the chain are represented in a treeview. You can right-click launch the videos. Warning: It can be a pig on certain videos with lots of responses.The script is also available on Userscripts.org.The floating

Billy Bob Bainnoreply@blogger.com0tag:blogger.com,1999:blog-10064838.post-1162562307184746342006-11-03T07:41:00.000-06:002006-11-03T07:58:27.223-06:00

We recently rode a steam train from Palestine to Rusk on the Texas State Railroad. I enjoyed it almost as much as my 3 year old son.When we got close to Rusk, we passed through Java, Texas. The railroad sign is too small in this pic, but click on the image & you'll get the original image.The following is from TexasEscapes.com.The settlement is said to have been named for a petticoat lost (and

Billy Bob Bainnoreply@blogger.com0tag:blogger.com,1999:blog-10064838.post-1157028461257804982006-08-31T07:06:00.000-05:002006-08-31T08:50:54.716-05:00

In March of 2005 I posted the article Performance 101 - Avoiding Work. In that tip I described a process where we store the users last jdbc connection in a hashmap using the HTTP Session ID as the key. In the last few months, several of our customers had been experiencing random, unexplained connection leaks when under a heavy load.We were unable to duplicate this issue in house, even though we

Billy Bob Bainnoreply@blogger.com2tag:blogger.com,1999:blog-10064838.post-1148644598752355392006-05-26T06:14:00.000-05:002006-05-26T06:58:34.446-05:00

I saw this in the Secure Coding Antipatterns session at JavaOne 2006. It might scare the hell out of you.Suppose I have the following class Foo and the constructor of Foo throws an exception. This might be due to some kind of security constraint or an invalid state. Suppose we don't anyone unauthorized to call the doEvil() method.public class Foo { public Foo() { System.out.println("

Billy Bob Bainnoreply@blogger.com4tag:blogger.com,1999:blog-10064838.post-1147449928184571052006-05-12T10:53:00.000-05:002006-05-12T11:06:35.883-05:00

I spent some time developing a proof of concept for Tapestry and RSP-UI for others to review. I've forwarded the POC directly to Wolfgang Gehner at Infonoia for possible integration into the sample application.Information on RSP-UI can be found here.http://www.eclipse.org/proposals/rsp/The POC can be downloaded from here.http://www.babbleknot.com/stuff/tapestry-rsp-workspaces.zipThe zip file

Billy Bob Bainnoreply@blogger.com0tag:blogger.com,1999:blog-10064838.post-1145453279339818062006-04-19T08:24:00.000-05:002006-04-19T08:29:07.970-05:00

Found this from Salon in my inbox this morning. Nice PHP errors there...

Billy Bob Bainnoreply@blogger.com0tag:blogger.com,1999:blog-10064838.post-1145276538016262272006-04-17T07:01:00.000-05:002006-04-17T07:22:18.030-05:00

I found this thread on Artima forums discussing where logic should reside in database apps: stored procedures or java.We've had this discussion many times at my place of work & I am currently on a project with zero stored procedures. But stored procedures are used heavily in our still strong legacy app & they helped us achieve acceptable performance at the time. One of the issues I remember from

Billy Bob Bainnoreply@blogger.com3tag:blogger.com,1999:blog-10064838.post-1143208150151689162006-03-24T07:38:00.000-06:002006-03-24T07:50:11.230-06:00

Be aware that unboxing can cause a NullPointerException.Suppose I have this function.public void test(int a) { ...}and I declare this variable Integer x = null;then when I make this call test(x)I get a NullPointerException as x is "unboxed" to an int. A more specific exception such as "NullPointerExceptionDueToUnboxingYouMoron" would have helped.Enjoy.

Billy Bob Bainnoreply@blogger.com2tag:blogger.com,1999:blog-10064838.post-1136489648443934042006-01-05T12:51:00.000-06:002006-01-05T13:37:38.403-06:00

Thomas writes that he is confused why this code won't compile when it satisfies the switch label requirements in the JLS specification. This snippet is cut from his site.1. public class Harbour {2. static void foo(){}3. public static void main(String[] args) {4. int bootNumber = new Integer(2007);5. final Integer year = 2007;6. switch (bootNumber) {7. case 10: foo();break;

Billy Bob Bainnoreply@blogger.com0tag:blogger.com,1999:blog-10064838.post-1133557762865733672005-12-02T14:52:00.000-06:002005-12-02T15:10:49.316-06:00

Been no tips cause there is too much work. Other than this one... recently had the need to match a java.sql.Connection to its Oracle counterpart. We did it with a SID & Serial.If you execute this query as you take a connection from the pool, you can match them up. Not a good idea in production, but ok for test and debug. select sid, serial#, metauser from v$session where audsid = userenv('

Billy Bob Bainnoreply@blogger.com0tag:blogger.com,1999:blog-10064838.post-1115296501075247452005-05-05T08:51:00.000-05:002005-05-05T08:58:18.903-05:00

Business Week has an interview with James Gosling. I like this response.Q: Many people have tried to take credit for Java's success over the years. At this 10-year anniversary, are there any unsung heroes?A: One of the things that has always kind of bugged me is everyone talks about me as the guy who created Java. That was true up until about 8 to 10 years ago. I wrote the first thing. But you

Billy Bob Bainnoreply@blogger.com2tag:blogger.com,1999:blog-10064838.post-1110549007334200972005-03-11T07:26:00.000-06:002005-03-11T07:57:48.336-06:00

We have a "performance" team at my day job. I am often unofficially assigned to this team when we are benchmarking a new release. While this is important stuff, I think more needs to be done to train the developers on performance basics.First off, let me say that I do not consider myself an expert on performance. I do know how to analyze performance data and tune algorithms, but that's down in

Billy Bob Bainnoreply@blogger.com1tag:blogger.com,1999:blog-10064838.post-1110116777377452802005-03-06T07:22:00.000-06:002005-03-06T07:46:17.383-06:00

I bought a subscription to MyEclipse over a year ago, but let it expire. Recently I downloaded an update and after using it for a couple of weeks, I must renew my subscription. We use Struts Studio at the office. In fact, I helped select it. But this $30 / year package blows it away in many areas. It goes beyond just doing struts development and gives you nice little tools for everything. If you

Billy Bob Bainnoreply@blogger.com2tag:blogger.com,1999:blog-10064838.post-1106594578378645962005-02-01T15:00:00.000-06:002005-02-01T15:35:46.673-06:00

Go to JavaOne. I have attended the San Franscisco summer JavaOne for the past few years. The 2004 event was a return to the glory days. The session quality continues to improve and the evening BOFs are great. Bring your laptop cause wi-fi abounds. In the evening BOFs, beer is acceptable everywhere. I've also seen folks buying beer during the day at the snack bars. That would just make me sleepy.

Billy Bob Bainnoreply@blogger.com0tag:blogger.com,1999:blog-10064838.post-1106488243190731562005-01-24T07:19:00.000-06:002005-01-24T07:59:56.466-06:00

The hotspot compiler has known bugs that can cause the compilation thread to go cpu bound. We had seen this behavior occasionally in production. A customer would call & report that no one was logged into the system, but it was at 100% on one cpu. The instance would normally be restarted & things would be fine. We couldn't figure out why & of course the customer was frustrated at having to restart

Billy Bob Bainnoreply@blogger.com0tag:blogger.com,1999:blog-10064838.post-1105626229237918542005-01-13T07:45:00.000-06:002005-01-13T08:23:49.236-06:00

This is in our java standards. You should not create a java bean property name that begins with a capital letter in the 1st two places. It can lead to confusing results. We had this happen a few times & finally added it to our standards & enforce it in code reviews. One place we saw problems was in struts. The form bean properties are used in the JSP page, but the Struts framework has to use the

Billy Bob Bainnoreply@blogger.com2tag:blogger.com,1999:blog-10064838.post-1105486150158484242005-01-11T17:06:00.000-06:002005-05-05T08:54:53.396-05:00

Ok, this is hard to do on purpose with plain old java, but I've seen plenty of JSPs that when compiled had a method that exceeded the 64KB limit. Depending on the VM it may just barf and end with a hotspot error or it might give you some kind of useful message. I find it's just a hotspot error. Tomcat describes this problem in their release notes.The simplest way to fix this is to break the page

Billy Bob Bainnoreply@blogger.com13tag:blogger.com,1999:blog-10064838.post-1105462123290518822005-01-11T10:37:00.000-06:002005-01-11T10:58:22.466-06:00

An endorsed standard is a Java(TM) API defined through a standards process other than the Java Community Process(SM). These standards might be revised between releases of the Java 2 platform. Sun defined the Endorsed Standards Override Mechanism (ESOM) to allow a developer to provide a newer version of an endorsed standard than those include in the Java 2 platform. The classes that need to be

Billy Bob Bainnoreply@blogger.com0tag:blogger.com,1999:blog-10064838.post-1105447592519867042005-01-11T06:40:00.000-06:002005-01-11T15:51:25.406-06:00

This is very specific to the Struts web application framework. Don't use a field on a Struts action class. Struts caches action classes & reuses them to call the execute() method. (perform() on 1.0) This can cause unexpected behavior & performance issues under a load. Add a check for this to your code review process. Thanks to the anonymous person who pointed out even without the 'static'

Billy Bob Bainnoreply@blogger.com4tag:blogger.com,1999:blog-10064838.post-1105369861014924522005-01-10T08:38:00.000-06:002005-01-10T09:18:04.510-06:00

When coding a switch statement, use contiguous ranges even if they are dummies. The compiler can optimize switches that use contiguous ranges. If you decompile to bytecode using DeCafe or similar, you SHOULD see the "tableswitch" bytecode where this switch begins. If you see "lookupswitch", it will use a O(n) lookup instead of directly jumping to the statement. I've seen nice performance

Billy Bob Bainnoreply@blogger.com1tag:blogger.com,1999:blog-10064838.post-1105365367483128552005-01-10T07:47:00.000-06:002005-01-10T08:31:05.053-06:00

I'm going to start writing down some of the java tidbits I've picked up over the years. I find I'm starting to forget some of them... so this serves as a permanent reminder for myself and possibly education for some. Many of these will seem trivial and I doubt any are original ideas. When comparing a constant to a variable, always put the constant on the left side of the expression. This will

Billy Bob Bainnoreply@blogger.com0