compile error

[Brodie Patten]

Hello all,
I'm compiling a little program and receiving the following error.
Error occurred during initialization of VM
Could not reserve enough space for object heap
I assume that VM stands for Virtual Machine, but not too sure about object heap. Any ideas??

[Brodie Patten]

It probably has something to do with the fact that my PC at work sucks. I'll reboot and try again. Still interested in the term 'object heap'.

[Junilu Lacar]

Probably refers to the portion of memory allocated to a process in which objects "reside" at runtime. If you read about the String class, you will run across the term "string pool" and "heap" as in:

   // this resides in the string pool
   String sp = "foo";
   // this statement actually creates two String objects
   // ss is in the heap at runtime, while "bar" is in the pool
   String ss = new String("bar"); 

Bartenders and Sheriffs, do I understand it right?
J. Lacar

[Cindy Glass]

Pretty darn close!

sp is in the Constant Pool (which is usually in ROM).
a new String containing "bar" is created on the heap (in RAM: Brodie this is what your problem is - just not enough of it)
However ss is not an object. It is a variable that is holding an object. Variables get created in the stack (which is also in RAM)

[Brodie Patten]

Me again,
I rebooted and now I'm receiving a new error. Even for my HelloWorld script, which was running properly, I'm receiving this error. I can compile the programs, but when I run them I receive the error:
Error occurred during initialization of VM
java/lang/NoClassDefFoundError: java/lang/Ojbect
I installed Opera with the Java package bundled with it. I'm wondering if this is part of the problem.

[Chris Stehno]

What kind of computer and what platform are you working on?
Your JRE may be too beefy for your hardware.
Or ... the Java package that came with Opera may be fluff. You should go to java.sun.com/products and download a new JDK or JRE.
Hope this helps
------------------
Chris Stehno (Sun Certified Programmer for the Java 2 Platform)

[Cindy Glass]

If the Opera app reconfigured your path and classpath, you might get such and error. Check them out and either put them back the way you want them or do your testing from the opera directories.

[Brodie Patten]

Thanks for the help. You were correct, Opera must have reconfigured my classpath. I edited it and my program ran properly.
Thanks again.

[sona gold]

could someone explain the use of API document
and how to use it
thx

[Cindy Glass]

The J2SE API is a JavaDoc document providing information about all of the classes that come with the J2SE JVM. You use it to look up what methods are available in each class and how you can structure the constructor when creating an instance of each class etc. Unfortunately most of us mortals can not memorize the entire API, so we keep a reference to it handy at all times.
There is an API document for each of the specialty areas also. There is an API doc for the 3D package that you can add on to the basic java classes, and another for Java Security, etc.
Mostly I just keep a link to the plain API in my favorites and run off to read parts of it on a daily basis.