The errata list is a list of errors and their corrections that were found after the product was released.
The following errata were submitted by our customers and have not yet been approved or disproved by the author or editor. They solely represent the opinion of the customer.
Color Key: Serious technical mistake Minor technical mistake Language or formatting error Typo Question Note Update
| Version |
Location |
Description |
Submitted by |
Date submitted |
| Printed |
Page 279
2nd paragraph |
Quote:
"If we compile this and run one thread under Sun's Java 1.1.7 on
a 4-CPU Sun machine the execution time is 13 seconds:"
Note that this does not include startup costs (the time required to
set up the Java Virtual Machine, load the class file, instantiate
any objects, and create the main thread). These can be estimated as
shown below (obviously the absolute time value is not comparable, as
both the hardware and the Java Virtual Machine differ). To estimate
the Java Virtual Machine setup time:
martin@living:~/WebPerf/ch16> time java -version
java version "1.4.0"
Java(TM) 2 Runtime Environment, Standard Edition(build 1.4.0-b92)
Java HotSpot(TM) Client VM (build 1.4.0-b92, mixed mode)
real 0m1.677s
user 0m1.620s
sys 0m0.040s
And because the bulk of the processing is performed by the threads
(the main method merely launches the threads - at 50 milliseconds or
so, this can be ignored), a better measure of the overall startup
costs (the Virtual Machine, plus class loading, object creation and
the main thread) can be derived as follows:
martin@living:~/WebPerf/ch16> time java Loop 0
real 0m2.265s
user 0m2.140s
sys 0m0.110s
These costs will be relatively constant for any number of threads,
and can be safely ignored for performance purposes when amortized
over many threads.
This is not really a technical mistake (possibly it's an omission),
but I thought it was interesting enough to include here for others
to read.
|
Anonymous |
|
| Printed |
Page 312
3rd paragraph |
"The <i>java.awt</i> package needs to open an X display to render GIF
images, even if the image is generated off-screen."
With the recent release of Java 1.4, 'headless' (i.e. no X display)
operation is theoretically possible. The following link offers more
information:
http://java.sun.com/j2se/1.4/docs/guide/awt/AWTChanges.html#headless
This is obviously not a 'language change or typo', merely a recent
development that might be of interest.
|
Anonymous |
|
| Printed |
Page 409
3rd paragraph |
Compile with 'java jdbcCxnTest'.
Should be:
Compile with 'javac jdbcCxnTest.java'. Obtain a usage message with
'java jdbcCxnTest'.
|
Anonymous |
|