Why JDeveloper9i so slow

Question

hi.I am a chinese body.I used your soft --JDevelper9i 902.Now I have
some questions .Could you help me ? I wrote some EJB code and they can
run in the oc4j. Now I want to write more EJBs using JDevelper9i.So I
add the old ejb to my project.Now my project have almost 100 EJBs.Then I
run them. The JDevelper 9i ran very very slowly . It took 30 minutes to
start the OC4J .Could you tell me why .Maybe I made some mistake .
My computer's information :
CPU P III 933
RAM 256M
OS Windows XP professional
I am poor in English ! I wish you can understand me and ask my questions
.Or you can give me some books or articles to solve my problem .
thanks
Tod

Answer 1

The memory utilization of a Java process is principaly due to the complexity of the JVM, not the language itself. Much of the memory used is shareable, read-only and or execute only memory pages that the OS can share between Java processes. You can substantially reduce the amount of non-shareable memory consumed by adjusting the command line options to reduce maximum heap size, thread stack size, etc.
The assertion that Java is slow is not supportable on the evidence at hand. Java's complex environment (the JVM) tends to cause Java programs to startup slowly. I wouldn't write a lot of simple command line utilities in Java (without using some sort of shared JVM) - C, Perl and the like are better at that.
I build very complex systems with Java and the performance of these is quite good, on par with what you would find if implemented in C or C++.
On the Unix side of things, Java GUI performance, specifically Swing - AWT if fine, is quite poor when executed on remote X terms. This is supposedly addressed by Java 1.4, but since I generally create server-side systems, I haven't looked into it much.
That said, I do use a lot of Java Swing GUI applications (OK, mostly on Windows) and they perform quite well on my moderate (366MHz) notebook computer. Specifically JBuilder 4 and 5, and Together/J.
Chuck