Trouble with Java 2D Graphics

I have a servlet which creates some graphic components on the server and then encodes the graphics as a JPEG using Sun's codecs on a BufferedImageStream.
The graphics involve overlaying filled areas. According to the 2D api the default AlphaComposite rule is to use the SRC_OVER rule where the added area will hide any area it overlays, but it should leave the other areas unchanged. Unfortunately in my app I am finding that the overlayed area not only masks the areas underneath it, but it also changes the colors of the uncovered areas to its current color. I have tried applying AlphaComposite rules explicitly with no luck. Any suggestions would be welcome. Thanks
Rich

What about setting a clip when you plot the grahpics.
Mark

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Trouble with java security manager

I have set up a security manager for my webapp running on Tomcat. The application enables the user to write his own scripts using Javascript, that's why I need to set up a security manager.
Using Rhino as script interpreter, it is possible to use the standard java security mechanisms, e.g. using the security manager to handle the scripts' rights.
I've added the following lines to my policy file:
// give server all rights
grant codeBase "file:webapp/WEB-INF/-" {
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grant codeBase "file:restrictedClient" {
     permission java.io.FilePermission "webapp/WEB-INF/lib/js.jar", "read";
I've assigned the scripts to the "restrictedClient" code base. However, the script execution fails as the script does not have the permission to access or define classes of any package (even standard java packages like java.lang or java.math).
In java.security, I have found the following comment:
# List of comma-separated packages that start with or equal this string
# will cause a security exception to be thrown when
# passed to checkPackageDefinition unless the
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# by default, no packages are restricted for definition, and none of
# the class loaders supplied with the JDK call checkPackageDefinition.
#package.definition=
I now wonder, why the checkPackageDefinition is checked though there's no entry for any package to be checked.
Extending the policy file like
grant codeBase "file:restrictedClient" {
     permission java.lang.RuntimePermission "accessClassInPackage.webapp/WEB-INF/classes/org/mozilla/javascript";
     permission java.io.FilePermission "webapp/WEB-INF/lib/js.jar", "read";
     permission java.lang.RuntimePermission "defineClassInPackage.java.io";
     permission java.lang.RuntimePermission "defineClassInPackage.java.util";
     permission java.lang.RuntimePermission "defineClassInPackage.java.net";
     permission java.lang.RuntimePermission "defineClassInPackage.java.sql";
     permission java.lang.RuntimePermission "defineClassInPackage.java.lang";
     permission java.lang.RuntimePermission "defineClassInPackage.java.math";
     permission java.lang.RuntimePermission "de.methodpark.pkit.facade.impl";
works, but an unpleasant feeling remains :-).
Rhino creates an own classloader for script execution. Could that be the source of the strange behaviour?
Any help would be appreciated!
Regards,
Matthias

David,
I was glad to see your post regarding WLS 9.2 and the troubles with enabling Java Security Manager.
Were you able to learn any more on things like - why doesn't the admin console work when the security manager is enabled with the default policy file. Also, why is it so difficult to add permissions for your own applications and get them to actually work.
I'd be curious to see if you were able to get it to work or if you have any insights or resources that can help with this as we are really struggling to get a restrictive policy file that works.
Thanks,
D

So sick of having trouble with Java and Mac!

I bought myself a brand new MacBook Pro OS X 10.5.8 for around a year ago. Since the first month I've had so many problems with my Java. It's eighter not working, or its is so slow that you can't work with it, at all.
Yesterday I was playing a game, were you're in need of Java. It worked perfectly. Then suddenly, it stopped again. And I tought, since I had not used it for a while, I just had to update it. So I clicked at the "software update" and updated everything. I don't think Java was at the list. Still wasn't working. So I went to Apple.com and searched for the "Mac OS X 10.5 update 10" and found it. I downloaded it, and installed it about five times or something, still not working. I've tried everything that came to my mind to try fixing it, but nothing works. What can I do? I'm so sick of having this problem every time I'm in use of the mac. Realy start to regreat the expensive bought of this mac.
Please, someone help me. I hate the tought of wasting 16 000,- Nok at this pc, when it's not working the way I'm using it..
And sorry for the bad english, I'm only 15..

Hei Kristine, er engelsk ikke så ille!
Very Important, how much Free Space is on your Hard Drive first of all? Click on the Macintosh HD on the Desktop, then do a Get Info on it.
Could be many things, we should start with this...
"Try Disk Utility
1. Insert the Mac OS X Install disc, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu at top of the screen. (In Mac OS X 10.4 or later, you must select your language first.)
*Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.*
3. Click the First Aid tab.
4. Select your Mac OS X volume.
5. Click Repair Disk, (not Repair Permissions). Disk Utility checks and repairs the disk."
http://docs.info.apple.com/article.html?artnum=106214
Then try a Safe Boot, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, reboot when it completes.
(Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive.)
If perchance you can't find your install Disc, at least try it from the Safe Boot part onward.

Trouble with "java.lang.OutOfMemoryError: Java heap space"

Hello,
I use a Java-based modeling tool that very few out there are probably familiar with. This tool allows me to run models (program) from within the development environment, to create Applets or create jar files that can be executed in a stand-alone fashion.
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I am not much of a Java programmer; I'm learning as I go along. If anyone can help me solve this, I'll be most appreciative
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asspath enterprise_library.jar;business_graphics_library.jar;for.jar;xjanylog
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Exception in thread "Image Fetcher 0" java.lang.OutOfMemoryError: Java heap spac
e
java.lang.OutOfMemoryError: Java heap space
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java.lang.OutOfMemoryError: Java heap space
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actions: java.lang.OutOfMemoryError: Java heap space
thread = Thread[AnyLogic main thread,5,main]
engine = com.xj.anylogic.Engine@1099257
java.lang.OutOfMemoryError: Java heap space
setting error: Exception in statechart 'root.courseDelay-0.inputProcessor' entry
actions: java.lang.OutOfMemoryError: Java heap space
thread = Thread[AnyLogic main thread,5,main]
engine = com.xj.anylogic.Engine@1099257
java.lang.OutOfMemoryError: Java heap space
setting error: Exception in statechart 'root.courseDelay-1.inputProcessor' entry
actions: java.lang.OutOfMemoryError: Java heap space
thread = Thread[AnyLogic main thread,5,main]Exception in thread "AWT-EventQueu
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java.lang.OutOfMemoryError: Java heap space
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Hi I am ancountering the same problem with the 'heap space'.
Is there any way I can find out what it is set to for my system? I dont believe its 32Mb and dont want to increase it randomly to too large a size if theres no need for it.
Thanks,
Bobby

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I have three computers with different running systems, vista, xp and the other i dont remember. We are experiencing java problems with all three. We cannot play games on pogo, chat on my homework pages or even play games on java's web site and sometimes the sites just shut down. We have tried numerous changes through javas website to no avail...does anyone have any ideas?

and why are you asking this here? we are not a "fix my computer" forum. You will need to look elsewhere.

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you can't 'open' java.exe
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Having Trouble with Java Cryptography Extension (JCE)

Hi, this is my first attempt at using the JCE. I'm using JCE 1.2.1
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protected FileOutputStream encriptFile(FileInputStream baseFile,
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catch (java.security.NoSuchAlgorithmException nsA)
System.err.println(nsA);
nsA.printStackTrace();
catch (java.lang.ExceptionInInitializerError eIIE)
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Please check out the following:
1. Be sure that the jar file will be viewable from classpath and that the provider you want to use will be in java.security file.
2. In the java.security file you should have something like this:
security.provider.1=sun.security.provider.Sun
security.provider.2=com.sun.crypto.provider.SunJCE
3. If you wish, you can test your program with another JCE implementation, like cryptix.
You can download the api and documentation of cryptix at http://www.cryptix.org/products/index.html
I wish this can be useful to you!!!
Thank you for some duke dollars.

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Having Trouble with Java Mail and Servlets

How can I send and receive mails using Java Mail API and Servlets

You should familiarize yourself with the JavaMail API and the servlet API--this is much too broad a question to properly answer in a forum. The J2EE Tutorial shows how to send a mail message using JavaMail from a session bean, but the technique is similar to what you would use from a servlet:
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Why do I have so much trouble with java?

I play games on Pogo. Every day it tells me that I need to download Java. It takes a long time to get it to work.

Java plugins 7u10 or lower are blocked for security. You can download Java v7u11, and see all of:
https://support.mozilla.org/en-US/questions/944956?page=3

Having trouble with choppy leopard graphics

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Help would be greatly appreciated,
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Unfortunately this is a common problem in leopard. Be patient an update will be out soon. It was exactly the same when Tiger came out. EVen Mac Pro users are reporting this.

Little experience with Java and graphics

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Does anyone know the best way to add an Image overtop of a component like a button? Please keep in mind that I must avoid any Swing and use only AWT classes. Thanks in advance.

Does anyone know the best way to add an Image overtop
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Heavyweight AWT components (aside from Canvas) cannot be drawn over or have their paint method overridden.

Should we avoid Graphical mapping and stick with Java mapping?

After developing mappings in XI for a month, I just don't see any good reasons to use Graphical mappings over Java mappings. Maybe some experienced users here can give me some valid reasons why we should choose Graphical mappings. Here is what I think:
Disadvantages of Graphical mappings:
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2. Complexity. Even for some simple requirements, your Graphical mappings can become complicated and hard to understand. A lot of times, I find myself staring at several dozens of graphical nodes and try to understand what it does.
3. Impossible to reuse. This is totally against the DRY (Don't repeat yourself) principle. For example, to generate messages for JDBC adapter, it is common to have two identical fields for primary keys: one in the access node and another in the key node. If you change the mapping logic in one, you have to remember to change the other.
Advantage with Java mappings:
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3. Highly reusable. We can use fundamental object-oriented designs to create highly reusable mapping components.
4. Better version control. Since the mappings are just Java classes, we can use CVS or SVN to track code changes.
5. Better build tools. We can fully utilize build tools like Ant and Maven to automate the build, unit tests, or even generate documents and mapping web sites.
So do you guys agree? Maybe I am still new to XI or I am missing some important things. But at this point, I just don't see why I should use Graphical mappings. Is there anyone developing XI interfaces completely with Java mappings?
Thanks in advance for any comments!
Kenny Cheang

Hi Suraj,
> Since its graphical the blocks will take space, but
> there is always an adavntage of processing time.
> Ebven though it may appear bigger, it will take less
> time as compared with Java code (for the same
> mapping).
Could you explain more why the graphical mapping has better performance? I thought the graphical mapping is compiled into a Java class in the runtime anyway.
> Yes thats there, but same goes with Java mapping too
> right (if you haven't mentioned it as constants)
I mainly think about inheritance. If I have to build 10 interfaces and they all have some common behavior, I can create a base interface class to encapsulate the common logic. But with graphical mapping, you have to duplicate them in each interface.
> Disadvantages of Java mapping:
> 1. Performance
Same as above. I just don't see why Java has worse performance. I actually think Java should have better performance. You can optimize the code anyway you want. In some cases, you have to use queue functions in graphical mapping but it's not necessary in Java.
> 2. All might not be well versed with Java Code(though
> everyone may know basic java) .
I am not asking everyone to abandon graphical mapping. I am just wondering which one is better when you have skills for both.
> 3. Lot of standard functions are available in GM
> which you can choose, but you have to remember the
> exact code for those in Java mapping.
You can create functions in Java too. All you have to do is to remember the function name.
Kenny

Editable graphics with java?

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I'm working with Illustrator CS5 and am having trouble with basic graphics textures.

I'm working with Illustrator CS5 and am having trouble with basic graphics textures. The illustrator drawings look fine with the pattern fills and when I bring the drawing into quark 9.1 they are still fine. When I print the quark file to lo res pdf drawing is still fine, but when I print to hi res pdf (press quality for print) the patterns disappear. I cannot figure out what the problem is.
just a note. Other textures and artistic fills work fine. It seems to be just the basic ones. I'm wondering if for some reason they may not be saved completely in my libraries?

Its just a drawing in black and white with some basic graphic texture to show “dirt” The pattern consists of a bunch of small lines. I save the file as an eps. And bring it into quark. When I print from quark I say print to pdf as press quality. I don’t think the problem has to do with acrobat because I’ve never encountered these problems before CS5. These drawings have been around for years and all of a sudden they don’t work.
Does this help?
Cath
Graphic Specialist
[email protected] 905-403-8658 x297
P Is it necessary to print this e-mail?

Trouble with Java 2D Graphics

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