Blackdown jdk



Keywords: blackdown jdk
Description: Select the version of the JDK you want. If other software that you are wanting to use does not recommend a specific version, I suggest the most current, which is at the time of this writing, JDK

Select the version of the JDK you want. If other software that you are wanting to use does not recommend a specific version, I suggest the most current, which is at the time of this writing, JDK 1.2.2.

Select the release candidate you want. If other software that you are wanting to use does not recommend a specific release candidate, I suggest the most recent or final version if available.

For the Blackdown JDK, there are possibly a number of different files available in different packaging formats. Additionally you have to be sure you get support for the right libc for your Linux distribution.

The files available include:
  • jdk - The Java Development Kit contains everything you need to compile, run, and debug Java. It does not contain international character converters.
  • jre - The Java Runtime Environment, including international character converters.
  • rt - A minimal Java Runtime Environment that does not include international character converters.
  • i18n - The internationalization font mappings and a JAR containing the international character converters.
  • native - Additional binaries providing native thread support.
When downloading the Blackdown files, you may need to select between libc5 and glibc as well as potentially a specific version of glibc. The libc options include:
  • libc5 - The older, and still most common, Linux libc is libc5.
  • glibc - The new Linux libc.

If you are using a newer distribution of Linux, you will most likely have glibc. I suggest initially trying glibc.

The above example shows JDK 1.2.2 release candidate 3 for the Intel architecture. Substitute the file name, version number, release candidate number, and architecture as appropriate. You will need to open each distribution package file in the above manner.

The JAVA_HOME environment variable references the home directory of your JDK installation. Set your JAVA_HOME environment variable to the directory into which you just installed a version of the Blackdown JDK.

The $JAVA_HOME/bin directory has the Java compiler (javac) and the Java Virtual Machine (java) as well as other necessary programs for development. Add $JAVA_HOME/bin to your PATH.

Note that $JAVA_HOME/bin was added to the front of the PATH so that the installed JDK will be used rather than any JDK that might have come with your Linux distribution.

The CLASSPATH environment variable references all JARs and directories that you will need to compile and run Java programs.

For JDK 1.2.2, you don't need to initially add any JARs to your CLASSPATH. JARs can be packaged in either .jar or .zip files.

Congratulations, you have installed, set up an environment for, and tested the Blackdown JDK on Linux.

For more information on the Blackdown JDK, see the Blackdown website at http://www.blackdown.org. There is an excellent FAQ available.

The IBM Java Developer Kit and Runtime Environment pass Sun's Java compatibility test and include the latest maintenance. (From the IBM website.)

As of the time of this writing, the IBM Java Developer Kit is current with JDK 1.1.8 and is available only on the Intel architecture.

In order to download, you will have to register with the IBM website and agree to the license online.

The files available include:
  • ibm-jdk-l118-linux-x86.tgz - The Java Development Kit contains everything you need to compile, run, and debug Java.
  • ibm-jre-l118-linux-x86.tgz - The Java Runtime Environment contains everything you need to run Java.

The above example shows JDK 1.1.8 for the Intel architecture. Substitute the filenames as appropriate.

The JAVA_HOME environment variable references the home directory of your JDK installation. Set your JAVA_HOME environment variable to the directory into which you just installed a version of the IBM Java Developer Kit.

The $JAVA_HOME/bin directory has the Java compiler (javac) and the Java Virtual Machine (java) as well as other necessary programs for development. Add $JAVA_HOME/bin to your PATH.

Note that $JAVA_HOME/bin was added to the front of the PATH so that the installed JDK will be used rather than any JDK that might have come with your Linux distribution.

The CLASSPATH environment variable references all JARs and directories that you will need to compile and run Java programs.

Initially I suggest adding the following JARs to your CLASSPATH. JARs can be packaged in either .jar or .zip files.

For more information on the IBM Java Developer Kit, see the IBM Java website at http://www.ibm.com/java.

Kaffe is a cleanroom, open source implmentation of a Java Virtual Machine and class libraries. As of the time of this writing, Kaffe "mostly complies with JDK 1.1, except for a few missing parts." And "parts of it are already JDK 1.2 (Java 2) compatible." (From the Kaffe website.)

Kaffe may have already been shipped with your Linux distribution because of its open source license.

Rather than downloading from Kaffe, I suggest you initially try the Kaffe that most likely came with your Linux distribution.

>From the Kaffe home page, select the current release. At the time of this writing, the current release is 1.0.5. The Kaffe version number has no relationship to JDK specification version numbers.

The CLASSPATH environment variable references all JARs and directories that you will need to compile and run Java programs.

Initially I suggest you add the following JARs to your CLASSPATH. JARs can be packaged in either .jar or .zip files.






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