This is post is in continuation of the below post in Worklight:
https://www.ibm.com/developerworks/forums/thread.jspa?threadID=470764
As suggested by Idan in the last comment, there is no JAVA_HOME environment variable set as of now on the Linux machine.
The problem is even if I set the JAVA_HOME environment variable, I am not sure which jdk path to add as there are multiple instances present on the Linux machine.
Please suggest me as to which jdk path to pick.
Thanks
You can find the Worklight system requirements depending on what version you are using, and what set up you need. However, if I remember correctly, I think you are cool using Oracle JDK 1.7 or IBM JDK 1.6.
Related
I want to install oracle weblogic server. I already downloaded it and it's fmw_12.1.3.0.0_wls.jar. In order to install it I'm instructed to run java -jar fmw_12.1.3.0.0_wls.jar. But when I run it I get
(...)X-Server access is denied on host
[Fatal Error] DISPLAY variable set incorrectly: :0
[Resolution] Verify that your DISPLAY environment variable is set correctly,
and that there is an X11 server on the system. If you are
running the Oracle Installer as a different user or on a different host,
you may need to use the xhost command to ensure that host/user
has permission to write to your display.
Logs are located here: /tmp/OraInstall2019-03-16_10-36-23PM.
My system is: CentOS Linux release 7.6.1810 (Core) My java is: Java(TM) SE Runtime Environment (build 1.7.0_80-b15)
I'm trying to perform this installation locally. I'm confused because every solution I came across assumed that I was logging via ssh or vnc server while I'm definitely not. What I tried:
set $JAVA_HOME to point to my jdk directory.
unset $ORACLE_HOME that was created for the database I have installed.
trying to set DISPLAY values to some other number than 0 (I know
its stupid but whatever).
reinstall java
I'm thinking if it might be the problem related with graphic drivers. Might it be that the defaults that were installed with X11 are somehow wrong? Or maybe centOS is not compatibile with this software? Should I maybe try oracle linux?
Add -Djava.awt.headless=true to your command line, e.g.
java -Djava.awt.headless=true -jar fmw_12.1.3.0.0_wls.jar
I solved my problem by using jdk 1.8 x64. This issue seemed to be caused by jdk 1.8 x86.
And yes, the problem was similar to yours. Give it a shot.
With reference to the above-mentioned title, the path has been given at the time of opening SQL Developer for the first time. Now I need to change the path.
Can anyone help me or guide me to do this?
It depends on on your operating system.
Windows:
User, AppData, Roaming Profiles, sqldeveloper, VERSION, product.conf
Note for the Version value: if you're on version 4.0, you'll see 1.0 as the top level directory. After that you should see things like 17.3 or 18.2.
Linux & OS X
$home/.sqldeveloper, product.conf
Open file, update your Java Home.
Make sure you're pointing to an Oracle Java JDK - we don't support OpenJDK today.
Latest version of SQL Developer expects a Java 8 JDK.
Version 19.2 or higher will also work with 11 or Oracle JDK 12.
In the same folder, Roaming, delete all older SQL Developer folders. When you upgrade SQL Developer version, Java will first look in these folders.
In my case, I browse the java path as
C:\Program Files\Java\jdk-11.0.8
It worked for me, please try it out if you need
I am getting following error while running /tmp/jprofiler8/bin/jpenable
No suitable Java Virtual Machine could be found on your system.
The version of the JVM must be at least 1.6 and at most 1.7.
Please define INSTALL4J_JAVA_HOME to point to a suitable JVM.
You can also try to delete the JVM cache file
I have also set INSTALL4J_JAVA_HOME to point to suitable JVM.
Java version on my machine is 1.4.2.
Can anyone please suggest what might be wrong or missing?
Unfortunately you did not mention details about your environment, so I don't know which Linux distribution you use.
There are some options though:
install a current JRE alongside the installer for JProfiler
As you can't install or update Java, you could provide a JRE in a kind of "portable application" setup. Simply unzip the server jre Oracle provides or (if you are not on an x64 architecture) unzip the jdk you also can download from Oracle.
But if the code you want to profile is limited to your pre-installed Java 1.4 you will run into another problem, because as far as I know Java 1.5 is the minimum JProfiler expects
use a different machine for profiling
Unless your code depends heavily on the environment you run it in you can even take a Windows 8.1 machine and profile the code there. Code that is slow is slow on any operating system. Or make use of a different Linux computer.
I'm running Minecraft on a headless Linux server with OpenJDK. I've added a bunch too many mods and its lagging (even on my local network) without using too much CPU or memory (e.g. its lagging, but its still got resources it can use). So I'm pretty sure its a mod fault.
To save the hassle of removing/adding mods one by one to see whats causing the error, my research led me to VisualVM where you can profile the java application and see which entities are doing what and with what resources. With any luck it should point out the mod consuming the most resources, and the most ticks.
Given its a headless server, and VisualVM is a window/GUI application, I've successfully managed to get it running and passing the GUI back to my Windows client using X over SSH.
Trouble is now, that its telling me that I need to use JDK and not JRE. Which is fair enough. Except OpenJDK has JDK in its name, rendering all googling futile. I cannot for the life of me, find if JDK is included in OpenJDK, what its named, and where it may be located. The other problem is, most of the troubleshooting guides I find are for Windows, and dont help me find the JDK on linux.
As some background information, I'm running Debian, and I know OpenJDK's JRE is installed here: /usr/lib/jvm/java-7-openjdk-amd64/jre
Can someone tell me please, if JDK is in OpenJDK, or I need to install it as well? If I do need to install it, is there an OpenJDK equivelant for JDK? If its already included, can someone provide some tips on locating it, so I can point VisualVM at it instead of the JRE?
The OpenJDK has a JDK, but there is also a cut down version which is just the JRE. I would use locate javac and if it can't find it, you need to install the JDK.
I am Using Ubuntu 12.04 and i want to run OpenLaszlo 4.9.0 in my system. I have read many tutorial, e.g.
http://wiki.openlaszlo.org/Installing_OpenLaszlo#Installing_the_DevKit_on_Unix.2FLinux
that say that put server in JAVA_HOME but i do not know where is JAVA_HOME in Ubuntu 12.04.
I have OpenLaszlo also . But I do not know how to start server of OpenLaszlo and where to put it? or how many things required for it? please tell me. I have Red5 server,i have install java-7-openjdk.
Thanks in advance.
JAVA_HOME is an environment variable. It stores the path to java runtime environment (jre). You can have several JVMs installed on your system, of course. So JAVA_HOME defines the default one.
Setting this variable after installing Ubuntu package from the repository is a little tricky. It is discussed, for example, here:
Jenkins, specifying JAVA_HOME,
What is the correct target for the JAVA_HOME envrionment variable for a Linux OpenJDK Debian-based distribution?
OpenLaszlo is a Web-application that should be run under some application server (usually Apache TomCat or its derivatives such as IBM WebSphere Application Server Community Edition).
It is available on the off.site as a bundle that includes TomCat and also as a .war file (a servlet) that should be deployed under your application server.
In the 1st case you can extract an archive wherever you want (read carefully about file permissions). But at the moment the server starts it needs Java system files so JAVA_HOME should be already defined.