I'm doing plugin development but none of classes will have a main. So without hard coding a path to my java directory how do i go about doing this?
I currently do this hack job
<property name="jdk.home.1.6" value="C:/Program Files/Java/jdk1.6.0_22"/>
and build upon that.
You have built-in properties in ant: http://www.roseindia.net/tutorials/ant/findHomePath.shtml
That mean you can use:
<property name="jdk.home.1.6" value="${java.home}"/>
HIH
You could try using System.properties()
System.properties() will return information regarding the current java virtual machine configuration.
"file.separator" Character that separates components of a file path. This is "/" on UNIX and "\" on Windows.
"java.class.path" Path used to find directories and JAR archives containing class files. Elements of the class path are separated by a platform-specific character specified in the path.separator property.
"java.home" Installation directory for Java Runtime Environment (JRE)
"java.vendor" JRE vendor name
"java.vendor.url" JRE vendor URL
"java.version" JRE version number
"line.separator" Sequence used by operating system to separate lines in text files
"os.arch" Operating system architecture
"os.name" Operating system name
"os.version" Operating system version
"path.separator" Path separator character used in java.class.path
"user.dir" User working directory
"user.home" User home directory
"user.name" User account name
Related
Background, I currently use Izpack for my Windows installer, I bundle a java runtime and use winrun4j as a wrapper both for the installation and the actual program once installed. It worked for a long time but there are a number of problems with the installer that I have not been able to solve and have been looking to replace it.
Oracle now provide the JPackage installer so it seems like a sensible choice. But the folder structure created by the installer is different to what I currently have, I have a number of config and non java files and I have not been able to get the .exe that JPackage creates to do anything.
So is it possible to use JPackage to create the installer but in a strcuture better matching my existing structure, and use continue to use WInRun4j to actyally run my application
Existing Folder Structure
ROOT
---App.exe
---Config Files
---lib
-------jar files
---JVM64
------- Java runtime
---help
JPackage structure
ROOT
---App.exe
---Runtime Dlls
---app
----- jar files
Config files
--runtime
------Java runtime
------Runtime Dlls (again)
The structure of directories generated by jpackage is mainly set up for you and does not seem possible to change, and makes installation of Java app dependencies very easy with self contained JRE. The basic structure for Windows is as you say:
ROOT
---App.exe (for --main-class parameter)
---xyz.exe (for each --add-launcher parameter)
---Runtime Dlls (these appear to be unused except for applauncher.dll, see SO 62607300)
---app/
------App.cfg (for --main-class)
------xyz.cfg (for per --add-launcher)
---runtime/
------Java runtime
------Runtime Dlls
With --input and --main-jar params you are free to setup additional directory structure under app/ folder for anything else you want for your application. So if you used lib/myappjar.jar it would add:
---app/
-------lib/
----------myappjar.jar
If you used --input build\mypath it would copy the entire tree of files under that folder, so if build\mypath dir contained
bin/
---Scripts
---xyz.properties
README.txt
Then app would also contain:
---app/
------bin/
---------Scripts
---------xyz.properties
------README.txt
By the way the Runtime DLLs placed at top level appear to be copies of some of the DLLs under runtime/bin
[https://stackoverflow.com/questions/62607300/why-is-java-jpackage-installing-windows-dll-files-in-two-places]
(Background: In a docker container on a NVidia Jetson TX2 board I have decompressed NVidia's Linux For Tegra tarball which contains lots of drivers and shared object files, some of which provide GStreamer element factories which produce elements that I use in my GStreamer pipeline. I am trying to run the pipeline in the docker container.)
However, there is an element in my GStreamer pipeline (on this Tegra board), called 'omxh264enc', which I haven't been able to create.
I've put the corresponding 'libnvomx.so' in my drivers folder which is in the exported paths GST_PLUGIN_PATH and the LD_LIBRARY_PATH.
ldd -r does not show any missing libraries for libnvomx.so
HOWEVER when I try and run the pipeline, output includes
WARN omx gstomx.c:2826:plugin_init: Failed to load configuration file: Valid key file could not be found in search dirs (searched in: /root/.config:/etc/xdg as per GST_OMX_CONFIG_DIR environment variable, the xdg user config directory (or XDG_CONFIG_HOME) and the system config directory (or XDG_CONFIG_DIRS)
INFO omx gstomx.c:2831:plugin_init: Using default configuration
ERROR omx gstomx.c:2894:plugin_init: Core '/usr/lib/aarch64-linux-gnu/tegra/libnvomx.so' does not exist for element 'omxh264enc'
WARN GST_PLUGIN_LOADING gstplugin.c:526:gst_plugin_register_func: plugin "/gst_1.8.3/libs/gstreamer-1.0/libnvomx.so" failed to initialise
and when I use GST_DEBUG=3 gst-inspect-1.0 libnvomx.so, libnvomx.so is blacklisted.
Plugin Details:
Name libnvomx.so
Description Plugin for blacklisted file
Filename /gst_1.8.3/libs/gstreamer-1.0/libnvomx.so
Version 0.0.0
License BLACKLIST
Source module BLACKLIST
Binary package BLACKLIST
Origin URL BLACKLIST
I have copied libnvomx.so into /usr/lib/aarch64-linux-gnu/tegra but this did not make a difference (probably because libnvomx is blacklisted).
I don't know where to find the gstomx.conf file, where maybe I can change the path /usr/lib/aarch64-linux-gnu/tegra/libnvomx.so to my designated drivers folder (/gst_1.8.3/libs/gstreamer-1.0/). I have used 'find' on /etc and some other folders but didn't find it (I didn't actually find a .config folder on the system).
(There are also other plugins with missing symbols, nvidia_drv.so with undefined symbol TimerSet and libglx.so with undefined symbol serverClient. I would like to find out what is suppose to provide these symbols? But these are not (direct) dependencies of libnvomx.so)
So how can I initialise / unblacklist libnvomx.so so I can use 'omxh264enc'? Do I need to find / make a gstomx configuration file or can I make it work with the default configuration? I read somewhere there may be a solution using a 'symlink' but at the moment I'm not familiar with what these are or how these work.
Let me know if you need more info, thanks.
I have a Grails application that I run as a Linux service. Basically I create a symlink from /etc/init.d/mygrailsservice to mygrailsservice.jar.
I want to increase the amount of OS memory allocated to the service.
How do I configure this?
Have a look at the spring-boot docs for executable jars and using them as system services - https://docs.spring.io/spring-boot/docs/current/reference/html/deployment-install.html
Specifically https://docs.spring.io/spring-boot/docs/current/reference/html/deployment-install.html#deployment-script-customization-when-it-runs
With the exception of JARFILE and APP_NAME, the above settings can be
configured using a .conf file. The file is expected next to the jar
file and have the same name but suffixed with .conf rather than .jar.
For example, a jar named /var/myapp/myapp.jar will use the
configuration file named /var/myapp/myapp.conf.
myapp.conf.
JAVA_OPTS=-Xmx1024M
LOG_FOLDER=/custom/log/folder
I was watching the Android development video and they asked us to install JDK and create JAVA_HOME environment variable.
I already have MyEclipse installed and I previously had setup the PATH variable(giving it the directory of JDK), do I still need a JAVA_HOME variable ??? If yes then why ???
Yes, you do need.
PATH is usually used to lookup the executables so that you haven't to specify the whole path to execute. JAVA_HOME may be used by the scripts or IDEs to lookup libraries. You can specify JAVA_HOME and build path variable basing on it. E.g (depending on OS)
PATH=$PATH;$JAVA_HOME/bin
Short answer, YES, you do need to set JAVA_HOME.
You can read here the difference between each one of them, but I'm pasting the explanations below as well:
JAVA_HOME and JRE_HOME are not used by Java itself. Some third-party programs (for example Apache Tomcat) expect one of these environment variables to be set to the installation directory of the JDK or JRE. If you are not using software that requires them, you do not need to set JAVA_HOME and JRE_HOME.
CLASSPATH is an environment variable which contains a list of directories and / or JAR files, which Java will look through when it searches for Java classes to load. You do not normally need to set the CLASSPATH environment variable. Instead of using this environment variable, you can use the -cp or -classpath option on the command line when using the javac and java commands.
PATH is an environment variable used by the operating system (Windows, Mac OS X, Linux) where it will look for native executable programs to run. You should add the bin subdirectory of your JDK installation directory to the PATH, so that you can use the javac and java commands and other JDK tools in a command prompt window. The JDK installation instructions explain how to set PATH.
If the application you are using is looking for a specific dataset in the JAVA_HOME environment variable and it isn't there, it is not going to be happy.
Other applications might look for the JDK path in the PATH environment variable, but just because you have it there doesn't mean it will work for other applications that need it in a separate variable.
I had an app using chromedriver on a Linux machine, and I switched the app over to a Windows 10 machine. Now suddenly it's telling me that it can't find the chromedriver file.
Here's error:
Selenium::WebDriver::Error::WebDriverError in Static#home
Showing C:/Users/User/Documents/test_app/app/views/static/home.html.erb where line #4 raised:
Unable to find chromedriver. Please download the server from http://chromedriver.storage.googleapis.com/index.html and place it somewhere on your PATH. More info at https://github.com/SeleniumHQ/selenium/wiki/ChromeDriver.
I placed the chromedriver file in the same place it was on my Linux machine, right in the main folder of the app. In this case the path is C:\Users\User\Document\test_app. Does Windows interpret paths differently than Linux?
The chromedriver is the latest release. It's titled "chromedriver_win32.zip". The "win" means Windows. Could the "32" mean it's for a 32-bit system? My machine is 64-bit.
If you put the chromedriver.exe in the folder Chromedriver_win32.zip which is in the same folder as your script, you can set the driver_path to that file. See code below:
require "selenium-webdriver"
Selenium::WebDriver::Chrome.driver_path = File.join(File.absolute_path('./', "Chromedriver_win32.zip/chromedriver.exe"))
driver = Selenium::WebDriver.for :chrome
driver.get "https://www.google.com.sg/"
I don't have any knowledge on ruby or ruby-on-rails. please find the equivalent in java or python in Windows OS.
Two ways:
you can keep Chrome driver in a place where it is added to PATH variable (environment variables in Windows 10)
Programmatically set the path to the executable chromedriver.exe
For Java:
System.setProperty("webdriver.chrome.driver", "/path/to/chromedriver");
For Python : (we keep chromedriver.exe in C:\Python27\Scripts location. this location is already added to PATH variable when python (Activestate) is installed. in case, chromedriver.exe is not in one of the PATH locations, you can specify as follows)
driver = webdriver.Chrome('/path/to/chromedriver') # Optional argument, if not specified will search path.
For Ruby:
Add the ruby installation path to Windows PATH environment variable and keep chromedriver.exe in that location. (Windows searches for binaries in the locations specified in PATH variable.)
For more info on setting ruby installation location to PATH
https://stackoverflow.com/a/26947536
References:
https://sites.google.com/a/chromium.org/chromedriver/getting-started
I would put this in as a comment, but, since I'm relatively new, I am forced to put it in as an answer, which it might well be...
Pardon me if I'm asking the obvious, but, did you try "unzipping" the file and putting the ".exe" file into that directory? The file you mentioned (you said.. titled "chromedriver_win32.zip") is not an executable file in Windows. The file you should be looking for is chromedriver.exe.