Where oh where did they hide my Java compiler?

[xenrobia]

Okay folks, I decided to try my hand at Java programming, but I can't seem to find Javac.
I've got a shiny new OpenSuse 42.3 Leap installation on my laptop and everything would seem to indicate
that I have Java-1.8.0_openjdk installed on my system as well. Does anyone have an idea where my Javac
got to?

Thanks

[eng-int]

 >   zypper info java-1_8_0-openjdk

java-1_8_0-openjdk 
Description    :                                                           
    SUSE's implementation of the OpenJDK 7 runtime environment.

    It contains a Java virtual machine, runtime class libraries, and an
    Java application launcher that are necessary to run programs written in
    the Java programming language. It is not a development environment and
    does not contain development tools such as compilers and debuggers. For
    development tools, see the java-1_7_0-openjdk-devel package.


  >   zypper info java-1_8_0-openjdk

java-1_8_0-openjdk-devel
Description    :                                                               
    SUSE's implementation of the OpenJDK 7 Development Environment.

    It is a development environment for building applications, applets,
    and components using the Java programming language.

[xenrobia]

Okay, I think I'm catching your drift, although I can't repeat your results exactly, I do get a confirmation
of what you're saying - which is that I'm SOL with respect to a compiler since I only have the Runtime Environment.

Well thanks for the help, I'm off to see about installing the Oracle JDK-9.0.4 since OpenSuse doesn't think I should be allowed
to compile anything.

Thanks again.

zypper info java-1_8_0-openjdk
Loading repository data...
Reading installed packages...


Information for package java-1_8_0-openjdk:
-------------------------------------------
Repository     : openSUSE-Leap-42.3-Update            
Name           : java-1_8_0-openjdk                   
Version        : 1.8.0.161-21.1                       
Arch           : x86_64                               
Vendor         : openSUSE                             
Installed Size : 565.7 KiB                            
Installed      : Yes                                  
Status         : up-to-date                           
Source package : java-1_8_0-openjdk-1.8.0.161-21.1.src
Summary        : OpenJDK 8 Runtime Environment        
Description    :                                      
    The OpenJDK 8 runtime environment.

[hendersj]

On Sun, 01 Apr 2018 01:56:01 +0000, xenrobia wrote:

> Well thanks for the help, I'm off to see about installing the Oracle
> JDK-9.0.4 since OpenSuse doesn't think I should be allowed to compile
> anything.

Just to be clear, it's Oracle who doesn't allow redistribution of the
Java compiler. You have to get it from Oracle directly - they
specifically don't permit redistribution in their license.

Jim

--
Jim Henderson
openSUSE Forums Administrator
Forum Use Terms & Conditions at http://tinyurl.com/openSUSE-T-C

[eng-int]

Okay, I think I'm catching your drift

No! Me being obtuse, sorry.
You were meant to read the package descriptions.

 It [java-1_8_0-openjdk] is not a development environment and 
    doe s not contain development tools such as compilers and debuggers.For
    development tools, see the java-1_8_0-openjdk-devel package.

To get the open-source Java Compiler you need to install the java-1_8_0-openjdk-devel package.

[xenrobia]

To get the open-source Java Compiler you need to install the java-1_8_0-openjdk-devel package.

And you were correct to do so, because shortly after that I started snooping around Yast and to my wondrous surprise I actually
located java-1_8_0-openjdk-devel package, did the installation and compiled a little program. But it did take a bit for me to find it.

So it was more like me being obtuse, but I finally got the point.

Thanks again for the help, Rob

[xenrobia]

On Sun, 01 Apr 2018 01:56:01 +0000, xenrobia wrote:

> Well thanks for the help, I'm off to see about installing the Oracle
> JDK-9.0.4 since OpenSuse doesn't think I should be allowed to compile
> anything.

Just to be clear, it's Oracle who doesn't allow redistribution of the
Java compiler. You have to get it from Oracle directly - they
specifically don't permit redistribution in their license.

Jim

--
Jim Henderson
openSUSE Forums Administrator
Forum Use Terms & Conditions at http://tinyurl.com/openSUSE-T-C

Darned Oracle... they don't want anyone to have any fun!!
I don't think Google would disagree.

[tsu2]

Bottom line for those new to openjdk and Oracke Java...

Despite the name "openjdk" it is <not> comparable to Oracke JDK.

openjdk only provides the runtime so is comparable to Oracle JRE.

If you want add-ons like javac which are in the Oracle JDK, for openjdk you need to install the openjdk-devel(or similarly named package for your openjdk version) as people found in this Forum thread.

TSU

[xenrobia]

Bottom line for those new to openjdk and Oracke Java...

Despite the name "openjdk" it is <not> comparable to Oracke JDK.

openjdk only provides the runtime so is comparable to Oracle JRE.

If you want add-ons like javac which are in the Oracle JDK, for openjdk you need to install the openjdk-devel(or similarly named package for your openjdk version) as people found in this Forum thread.

TSU

Hello there Tsu2:
I've been considering installing the Oracle JDK 9 for some of the new features offered, namely jshell and modules. You seem to have a good handle on the installation process so I thought I'd ask you
a couple of questions, if you don't mind.

1) Can I install Oracle JDK 9 along side my existing installation of the "java-1_8_0-openjdk and java-1_8_0-openjdk-devel" packages and keep my old installation as an Alternative?

If I can do the above,

2) Should I place my copy of jdk-9.0.4_linux-x64_bin.rpm in the same directory as java-1_8_0-openjdk? The current directory is root/usr/lib64/jvm/

3) Considering that the original installation is an openjdk as opposed to the Oracle JDK should I still use the UPDATE installation command: rpm -Uvh jdk-9.minor.security.patch_linux-x64_bin.rpm

4) Being that there is no patch level yet should the command be: rpm-Uvh jdk-9.0.4.0_linux-x64_bin.rpm or rpm-Uvh jdk-9.0.4_linux-x64_bin.rpm ?

Thanks, Rob

[tsu2]

I haven't yet reviewed procedures for Oracle Java 9.

for now, a <possible> guide would be the SDB: Installing Java
But, it looks like it's current only up to Oracle Java 8.
It also looks like the article has undergone a major re-write (organizing info) which was badly needed... With the many contributions since Oracle Java 7, the article was becoming very hard to follow.

'Way back for Oracle SE JDK 7, I took all the steps described, made some significant modifications and created some scripts that enabled installation in less than a couple minutes (It literally took longer to download than to install). Without those scripts, it easily took over half an hour to install.

I didn't create scripts for Oracle JDK 8 because of the major architectural changes in the new version and questions about what the new changes did that were unclear to me.

It looks to me that the same person who created the steps published for Oracle SE JDK 7 that I modified likely created the steps now in the SDB (and accordingly will likely mean a half hour install again).

I can take a look at the existing SDB again, look to see if they apply to the newest released Oracle SE JDK and then see if I can similarly re-create the scripts to make the install quick and simple, but will take some time.

Be aware that the default installation of Oracle Java has historically been to over-write installed Java (whatever that might be). The SDB describes steps that install Oracle Java side by side (not over-writing) and then sets up update-alternatives to allow you to switch between any installed Java.

So,
Bottom line is that I can't answer your questions about Oracle 9 at the moment, but will after a little time...

BTW -
It looks like the current latest Oracle SE JDK is version 10.

TSU