Raspberry Pi, NetRexx and JAVA - help for a beginner?

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Raspberry Pi, NetRexx and JAVA - help for a beginner?

GorseFox
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I have finally fired up my Raspberry Pi (having bought it when it was first released, it has sat on my desk for nearly 2 years awaiting "the right time").

All has gone to plan so far, and I have the latest RASPIAN running. I have download Netrexx and followed the "read.me.first" instructions and the basic Installation Verification Tests have worked. However, I have got into a bit of a muddle.

I consulted the Quickstart Guide (3.02) and it tells me that I should Download the ARMhf JDK and untar it. I followed the links and download the most recent file. Quickstart then instructs me:

-v /opt/java
tar xvzf ~/jdk-8-ea-b36e-linux-arm-hflt-29_nov_2012.tar.gz (the filename changed)
sudo mv -v ~/jdk1.8.0 /opt/java
etc...

What does the -v /opt/java do? I have tried looking at a man page but I cannot track it down, and I do like to understand what chaos I am about to cause.
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Re: Raspberry Pi, NetRexx and JAVA - help for a beginner?

Bruce Skelly
I think that if you are using the latest Raspbian image, then you don't need to down load and install the java jdk.  To check, you can try running 'dpkg -l *jdk*'. My system responds with:
oracle-java7-jdk 1.7.0+update40 armhf Java™ Platform, Standard Edition 7 Development Kit

You will also find the file 'LICENSE.oracle' in the /boot directory, which is the Oracle license for the jdk.

So any instructions about installing the java jdk are obsolete.

Bruce
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Re: Raspberry Pi, NetRexx and JAVA - help for a beginner?

Bruce Skelly
In reply to this post by GorseFox
I realized that I didn't answer your question.  The

-v /opt/java

Doesn't look like any command I know.  Either the line got wrapped at an unfortunate point, or the line was truncated somehow.

Bruce
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Re: Raspberry Pi, NetRexx and JAVA - help for a beginner?

rvjansen
In reply to this post by GorseFox
As Bruce correctly says, with the latest Raspbian image there is no need to download Java. If you issue the command 'java -version' it will reply with the java version. Raspbian has a JDK, but even that is not strictly necessary, as any JVM will do, NetRexx does not require a JDK anymore. (If you do not have a JDK, be sure to use the NetRexxF.jar and remember to set the -Dnrx.compiler=ecj property). You know you have a JDK when the 'javac' command works.

I have no clue how the -v /opt/java got into the manual - and that is bad because I probably put it there. As developments have rendered the whole passage obsolete, I have removed it now for the 3.03 edition.

best regards,

René Jansen.