Category Archives: DrJava

My work on DrJava, the Java IDE developed at Rice.

ReLooper for DrJava?

Posted on February 27, 2010 by Mathias

I received a message from Danny Dig, the project lead of the ReLooper project. ReLooper is a refactoring tool that enables Java programmers to parallelize loops over arrays or vectors using Java’s upcoming ParallelArray framework. I assume Danny searched for … Continue reading →

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1.6.0_18 Seems to Have Fixed Bug

Posted on February 18, 2010 by Mathias

Java’s latest version, JDK 1.6.0 Update 18, seems to have fixed the most frequent DrJava bug report, which Corky determined to be Sun’s problem (Oracle’s problem now). We have been filing all of the bug reports as duplicates of bug … Continue reading →

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The Free Java Book

Posted on February 15, 2010 by Mathias

Corky just informed me that there is a talk by Daniel L. Schuster at SIGCSE 2010 about Java, games, and the Free Java Book. I’ll definitely check out the talk and the book. I’ll also examine how concurrency is handled … Continue reading →

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Java Bug 4396719 Work-Around?

Posted on January 31, 2010 by Mathias

It seems like I can get around the garbage collector bug if I use -XX:+UseConcMarkSweepGC JVM argument. Now I’m having more Soot problems, but they actually make sense. In addition to being cross-platform, DrJava is also “cross-JDK version”: We support … Continue reading →

Posted in Concurrent Unit Testing, DrJava | 1 Comment

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More Details on Soot and -allow-phantom-refs

Posted on January 29, 2010 by Mathias

In the previous post I mentioned that I’m trying to create a call graph of all of DrJava using Soot. Since DrJava is a cross-platform application, there are classes that get compiled and used only on certain operating systems. The … Continue reading →

Posted in Concurrent Unit Testing, DrJava | 1 Comment

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Java Bug 4396719 – Mark Sweep stack overflow on deeply nested Object arrays

Posted on January 29, 2010 by Mathias

I’m trying to create a call graph of all of DrJava using Soot. DrJava is a cross-platform application that has some classes that get compiled and used only on certain operating systems; for example, the com.apple.eawt package is only used … Continue reading →

Posted in Concurrent Unit Testing, DrJava, Ramblings | 4 Comments

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Sometimes I Love Myself

Posted on January 25, 2010 by Mathias

Sometimes I have those moments when something small that I did brings me tremendous joy. This just happened when I was using DrJava with Soot. I don’t know the Soot framework, so the “Additional Javadoc URLs” feature that I introduced … Continue reading →

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Cygwin, Subversion and End of Lines

Posted on December 14, 2009 by Mathias

I got myself into a bit of a problem when I tried to set the automatic end-of-line style property for our text files in Subversion. I wanted to use “native”, because that should automatically convert all line endings to LF … Continue reading →

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Double.equals for NaN and -0.0

Posted on November 30, 2009 by Mathias

I just fixed two bugs in DrJava that had to do with boxed floating-point comparisons of NaN and -0.0. Both bugs had the same cause, a difference between the behavior of primitive == and the equals method in Double and … Continue reading →

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Remembered Number Significance

Posted on November 25, 2009 by Mathias

Memories can be strange. A lot of people around me are probably now having memories triggered by (turkey) smells. I have memories triggered by numbers. Our Hudson build server just notified us of a unit test failure after a recent … Continue reading →

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Mac OS X Race Condition in DrJava Start-Up

Posted on November 24, 2009 by Mathias

A few days ago, I noticed that double-clicking on a *.java file in Windows Explorer caused an AssertionError in DrJava. This wasn’t a huge issue, because it only shows with assertions enabled (i.e. -ea in the JVM Arguments for the … Continue reading →

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Open Source: Don’t Steal What You Can Have for Free

Posted on November 18, 2009 by Mathias

Open source is not the same as public domain material. It is not content that is not owned by anyone. The fact that we give something away for free does not allow you to just steal it. DrJava is an … Continue reading →

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New Mint Release

Posted on November 13, 2009 by Mathias

I just created a new release of Mint and DrJava with Mint. JavaMint-r14577.tar.gz JavaMint-r14577-binaries.zip drjava-r5130-mint-r14577.jar There were some dramatic performance improvements in the Mint compiler thanks to base type lifting instead of performing cross-stage persistence for them. I also fixed … Continue reading →

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DrJava Interactions Pane Output Redirection

Posted on November 3, 2009 by Mathias

We got a question today about how the output of a Java program running in DrJava‘s Interactions pane could be redirected into a file, just like it could be done in a Unix or DOS shell: java Motion > motion.dat … Continue reading →

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Funny Feature Request of the Day

Posted on October 31, 2009 by Mathias

Funny feature request of the day: Zoom In Zoom Out I would like to request you to please kindly add Zoom in Zoom out feature in print preview. Please do it as soon as possible bcz we are having difficulties … Continue reading →

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Softpedia “100% Clean” Award for DrJava

Posted on October 26, 2009 by Mathias

DrJava has been included in the Softpedia software database. Furthermore, their staff certifies with their “100% Clean” award that our software is free from malware: DrJava has been tested in the Softpedia labs using several industry-leading security solutions and found … Continue reading →

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A Repeating Pattern of Hate: SourceForge

Posted on October 23, 2009 by Mathias

I’m hating SourceForge again, and this is a very frequent thing. This time, I’m hating it for two reasons: News submission is broken. I made a new DrJava development release, drjava-20091021-r5004, but I can’t post a news release, because the … Continue reading →

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Two Confusing Errors

Posted on October 19, 2009 by Mathias

A while ago, I was told by our one-and-only client of Mint that the version of DrJava with Mint does not display Mint as a compiler, even though it is included in the jar file and therefore should be available. … Continue reading →

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And the Annoying Twit of the Month Award Goes to…

Posted on October 10, 2009 by Mathias

And the annoying twit of the month award goes to… this guy, a student at the Ozarks Technical Community College, for his truly legendary effort of generating 38 support emails to us without considering that the problem might be in … Continue reading →

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Confusing Hudson Test Failure

Posted on October 9, 2009 by Mathias

After moving our Hudson server to a new server, we started to experience a very confusing test failure in the Java Language Levels module. The test that failed was AdvancedLevelTest.testShouldBeErrors. It compiles the files in javalanglevels/testFiles/forAdvancedLevelTest/shouldBreak/ and makes sure that … Continue reading →

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