Java Stuff

Web Performance Reports

• http://www.webperformanceinc.com/

java.util.Date Gotchas

• http://www.mindprod.com/jgloss/gotchas.html#DATE

• http://www.mindprod.com/jgloss/calendar.html

Jar Dependencies Analyzer

• http://www.it-eye.nl/weblog/2005/07/01/finding-jar-library-dependencies-using-jarjar/

A Great Free Java Profiler

• http://www.khelekore.org/jmp/index.html

java -Xrunjmp my.fine.java.Program

LaunchAnywhere Error "Can't launch executable"

To solve the problem, insert the path to a "neutral" Java home "bin" directory in front of your PATH environment variable. I.e. simply install a JRE or JDK from the Java home page and insert the path to the 'bin' directory of that installation at the beginning of your user PATH environment variable.

By the way, you can launch a diagnostic console window for LaunchAnywhere by pressing the left control key during LaunchAnywhere start-up.

Sharing Java objects between applet class loader instances

This is not easily possible. Refer to the following links for more information:

• http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4225434 and
• http://java.sun.com/products/plugin/1.3.1_01a/new.html

Self-Signed Java Applets

Generate a new keystore "testkey.keystore" as follows:

keytool -genkey -keyalg RSA -sigalg MD5withRSA -keystore
    testkey.keystore -alias testkey -validity 1460

Using this command, the keytool will generate a new keypair and create a self signed certificate for its public key. To create the certificate, the keytool will prompt for the necessary bits of X.509 information.

To sign the applet, use code similar to this (this code snipped was copied out of an Ant script):

<exec executable="${env.JAVA_HOME}/bin/jarsigner.exe">
    <arg value="-keystore"/>
    <arg value="testkey.keystore"/>
    <arg value="-storepass"/>
    <arg value="changeit"/>
    <arg value="-signedjar"/>
    <arg value="output.jar"/>
    <arg value="input.jar"/>
    <arg value="testkey"/>
</exec>

In order to run an applet signed with this key, the generated certificate may have to be imported into the Java plugin. For this, the certificate must be exported and stored in a file (e.g. 'testkey.cer'). The command line used to do this is:

keytool -export -alias testkey -file testkey.cer -keystore
    testkey.keystore

The default keystore password is 'changeit'