Questions from Previous Semesters

Questions from Previous Semesters

Looks like the JMusic server is down. I'll upload my copy of the .gz file here. Mark Guzdial
JMusic

Question: My jmusic doesn't have an inst folder. if i put all the files with 'inst' in their names in a folder named inst, does that do the same thing?

also, i lack a bookClasses folder. man, i stink! what files are part of that folder? can i make it manually and have the same effect?|

You don't need a bookClasses folder – it's an old picture in the book. That's really weird – why no inst folder? Try your idea and see what happens. Mark Guzdial

Question: I had to reinstall Java and I accidently hooked Dr. Java to the 1.5 version when I running it on the 1.42 JDK. I didn't notice that there were three folders in the Java program folder and messed up. Now i can't compile or test anything, but I can't just delete the unnecessary folder or change which folder Dr. Java uses. Do I have to reinstall everything again?

If you have both the 1.5JDK and the 1.4.2JDK installed, you can change with tools.jar DrJava looks at by changing DrJava's preferences. Or, uninstall (from the System Control Panel) the one that you don't want, and then fix DrJava. (See FAQ for more on this.) In general, the rule is to make the JRE and JDK match in versions. Mark Guzdial

Question: I having a problem with the "rt" file Dr. Java uses. It's (for some reason) using the one from the 1.5 JRE instead of the one from the 1.42 JRE. I have no idea why it does this, but trying to change in by deleting the 1.5 JRE folder won't work(windows won't let me delete it because the files are in use by another program). How can I manually change what "rt" file Dr. Java uses?

"rt"? Do you means Tools.jar? Don't delete the folder – use the Systems Control Panel and uninstall. Mark Guzdial

Question: I reinstalled Dr. Java and it keeps trying to load from a folder (jre 1.5.06 I think) that doesn't exist. I can't even set up the preferences because it won't open now. Any ideas?

Reinstalling DrJava won't help. You have to (a) get DrJava to only use the JRE and JDK of the same version or (b) uninstall the JRE and/or JDK that you don't want to use. Mark Guzdial

Question: DrJava is telling me that i have no compiler available... did i install it incorrectly? -Beege

Yes. Did you download the JDK Version 6 Update 2 and install that first? Joel Uthe

Aye, I did. Do I need to completely uninstall then reinstall the JDK? I'm looking through my Add/Remove Programs list, and I see J2SE Runtime Environment 5.0 Update 8, Java 2 Runtime Environment, SE v1.4.2_03, and Java Platform, Enterprise Edition 5 SDK. Would I only reinstall the SDK, or would I have to do everything?-Beege

Download and install all the parts of JDK Version 6 Update 2 (the first one). There are also some students having problems with Setting up Java Path Variables. Joel Uthe.

I am trying to run all of the programs for this class on my Mac. Do I need to install the SDK under Parallels or with Bootcamp? All of the other programs (DrJava, jMusic) have Mac OSX downloads, but the Java SDK link provided only has for Windows, REMOVEDux, and Solaris.

I believe that you do not need to install the JDK since it is already installed on the MacOSX. I do not have a Mac, but I seem to remember this for past semesters. Let me know if it works or not and I'll continue searching for an answer. Joel Uthe
I second what Joel says. I'm fairly sure that Macs have an automatic updater. Dawn Finney

Well DrJava opened up fine with no problems, and I'm working on putting jMusic into the correct paths and directories and such now, so as long as that works, I think you guys are right. Thanks alot!! You saved me a trip to recitation!

Don't forget to try running through everything in homework 0 to see if everything is working. Dawn Finney.

My jmusic.jar file won't open. is that supposed to happen?

You don't have to open it. You just need to have Dr. Java pointing to it, meaning that it needs to be a classpath Dawn Finney.

I downloaded and extracted DrJava from the file, but the application won't open! I've got a Mac, so is there something extra that I'm missing...?

We're working on this...Please stay tuned. Sorry. Dawn Finney.

There is a JDK 6 Update 4. The only other thing I see is JDK Update 4 with Java EE 5 SDK Update 4. I can't find JDK 6 Update 3. Can/should I use JDK 6 Update 4?

It looks like Sun just released a new update for the Java JDK 6. You are welcome to use JDK 6 update 3 or 4 in this class if you are on a non-mac machine. Dawn Finney.

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Installation Problems? last edited on 11 May 2008 at 3:52 am by 24-180-26-82.dhcp.gldl.ca.charter.com