Develop Reference

Executing java.exe from C# in Azure Function

I'm trying to execute java to run a JAR file from an Azure function, but it seems like the java PATH variable isn't defined or something because Azure can't seem to find it. Code below:
Process proc = new Process();
try
{
proc.StartInfo.UseShellExecute = false;
proc.StartInfo.CreateNoWindow = false;
proc.StartInfo.RedirectStandardOutput = true;
proc.StartInfo.FileName = "java.exe";
proc.StartInfo.Arguments = "-jar file path and some more arguments";
proc.Start();
proc.WaitForExit();
if (proc.HasExited)
log.Info(proc.StandardOutput.ReadToEnd());
log.Info("Java Success!");
}
catch (Exception e)
{
log.Info("Java Fail");
log.Info(e.Message);
}
Even if I remove the proc.StartInfo.Arguments or tell it to use java.exe instead of java I still get the same error, below:
[Info] The system cannot find the file specified
Is calling java not supported in Azure functions?

OK figured this out. So far, the best way is to fully qualify the path to java.exe...
so I changed
proc.StartInfo.FileName = java.exe";
to
proc.StartInfo.FileName = "D:\\Program Files (x86)\\Java\\jdk1.8.0_73\\bin\\java.exe";
You can figure out the full path to Java using KUDU, which is https://[yourFunctionName].scm.azurewebsites.net/
If you click on Tools->DebugConsole, you can browse until you find where Java is located.
Note hard coding the path to Java is probably a bad idea so you should probably use application settings.
Edit Below is a link to a GitHub Repo with my final project. The project does some other stuff, but you can see where I call Java to execute the Batik JAR.
https://github.com/osuhomebase/SVG2PNG-AzureFunction

As of September 2022,
proc.StartInfo.FileName = java.exe";
Worked fine for me. It appears the Azure Function Environment has the JDK installed and the JAVA PATH variable set.

Runtime.getRuntime() restart mac Java IM

My os is MAC OS 10.11.3.
I using Spark as our IM（Instant messaging），but when the IM log out，IM give an error，said：
java.io.IOException: Cannot run program "open": error=2, No such file or directory .
But when Eclipse runs it， it worked well，and when I wrapped it a mac package and installed it and run it, click "log out" button, it throws errors.
In program, when I log out，I launch a new IM，meanwhile，I killed the old IM application.
Furthermore，in terminal，no matter what I run how many times “open -a Spark”，it just open the same IM，
The source as follows：
public boolean restartApplicationWithScript() {
String command = null;
try {
if (Spark.isMac()) {
command = "open -a " + Default.getString(Default.SHORT_NAME);
}
String commands[] = {"open", "/Applications/Spark.app"};
Runtime.getRuntime().exec(commands);
System.exit(0);
return true;
} catch (IOException e) {
Log.error("Error trying to restart application with script", e);
return false;
}
}

The exception seems to be saying that it cannot find the open command. That seems a bit odd, since it is a standard MacOS command. So I suspect that the reason that it cannot be found is that it is not on the PATH.
Try giving the absolute pathname for the open command. Running which open should tell you what it is.
If open is a shell builtin on MacOS, then you will need to create a subshell to run the command.

Thanks for all， i solved it by 2 step ：
1， cmdline = { "open", "-na", "Microsoft Excel" }; this add a "n" ,otherwise，it will open the same app 。
2，chmod -R 777 youAppPath，if not do this ，the app can't issue the command

How to open TestComplete from java code

I would like to open TestComplete from java, but I can't do that, because lack of privilege. When I run my code
public static void StartTC() {
try{
Process p = Runtime.getRuntime().exec(new String[] {"C:\\Program Files (x86)\\SmartBear\\TestComplete 11\\Bin\\TestComplete.exe"});
}
catch (IOException e) {
e.printStackTrace();
}
}
the program exits with CreateProcess error=740, and tells me that I need higher privilege for this action.
I know that I could make a .lnk with admin priv. at open properties of the exe, but there could be a right way to do this.

I think you can use File class for setting permissions.
File file = new File("File.c");
//but file permission are OS specific.
file.setExecutable(true);
In linux it will work.
If you are using windows then you can run "icacls" command to give permission to the file.
C:\>icacls "D:\test" /grant John:(OI)(CI)F /T
This command can be used to to give permission in windows.
According do MS documentation:
F = Full Control
CI = Container Inherit - This flag indicates that subordinate containers will inherit this ACE.
OI = Object Inherit - This flag indicates that subordinate files will inherit the ACE.
/T = Apply recursively to existing files and sub-folders. (OI and CI only apply to new files and sub-folders). Credit: comment by #AlexSpence.
You can run above command using Runtime.getRuntime().exec("icacls something here");
I hope I helped you.

You need to disable the Tools | Options... | Engines | General | Enable support for testing Windows Store applications option in TestComplete.
Information on how this can affect working with TestComplete from an external application like in your case can be found in the Requirements for Testing Windows Store Applications help topic.

write java file to C drive access error

Hi how can I get rid of C drive access with java codes I can do this with manual but I want to do this with java codes
here is my code
File file=new File("C:\\Windows\\b.txt");
if (!file.exists()) {
try {
file.createNewFile();
} catch (IOException e) {
System.out.println("file not created and");
e.getMessage();
e.printStackTrace();
}
And my exceptions
java.io.IOException: Access is denied
at java.io.WinNTFileSystem.createFileExclusively(Native Method)
at java.io.File.createNewFile(File.java:1006)
at tekrar.Write.main(Write.java:26)`

you need to run the program as an administrator to edit the C:\Windows folder. this is a system folder that you should not access.

You cannot write anything in the system folder without administrator privileges in windows. As I understand you cannot request administrator access from within a Java program and you'll have to RUN the application in admin mode.
See this question for some tips: Run Java file as Administrator with full privileges
P.S. Do you really need to write into the windows folder?

Open a path with Desktop.open() from java on ubuntu (linux)

From my application written in java I want to open a folder, using the operating system file explorer.
I use Desktop.open(new File(path))
This works fine on windows, but on ubuntu 11.10 (linux) it doesn't work.
Using the Desktop.open to open a file does work, both on ubuntu and windows.
Using a step in between:
File fPath=new File(fPath)
and testing it with fPath.exists() and fPath.isDirectory() both gives true.
using the Desktop.open(new File(path)) gives me this exception:
java.io.IOException: Failed to show URI:file:/and/here/the/path/I/use/
at sun.awt.X11.XDesktopPeer.launch(Unknown Source)
at sun.awt.X11.XDesktopPeer.open(Unknown Source)
at java.awt.Desktop.open(Unknown Source)
I was not able to test this on an apple computer yet, but I hoped the Desktop.open(new File(path)) was system independent.....
by the way, the complete code:
Desktop desktop = null;
// Before more Desktop API is used, first check
// whether the API is supported by this particular
// virtual machine (VM) on this particular host.
if (!Desktop.isDesktopSupported()) {
// show Error
return;
}
desktop = Desktop.getDesktop();
String path = "here the path ";
// by the way: I use System.getProperty("file.separator") as file seperator
try {
File fPath=new File(path);
if(!fPath.exists()){
// show Error
return;
}
if(!fPath.isDirectory()){
// show Error
return;
}
desktop.open(new File(path));
} catch (IOException e) {
log.severe(e.getMessage());
e.printStackTrace();
// show Error
return;
}
Some extra information:
OS: Linux (3.0.0-16-generic - amd64)
Java: 1.6.0_30-b12
Java home: /opt/java/64/jre1.6.0_30

I had the same problem. But in my case it was Ubuntu 18.04 and java 1.8.0_161-b12
In Windows 10, everything is working fine. But on Ubuntu
Desktop.getDesktop().open(new file)
the program stopped responding.
I decided to wrap the call in the executor:
private ExecutorService executorService;
BasicThreadFactory factory = new BasicThreadFactory.Builder()
.namingPattern("YourPatternIndeficator")
.build();
executorService = Executors.newSingleThreadExecutor(factory);
if (Desktop.isDesktopSupported()) {
File myFile = new File(path);
executorService.execute(() -> {
try {
Desktop.getDesktop().open(myFile);
} catch (IOException e) {
e.printStackTrace();
}
});
}

I was running into what sounds like the same issue on Mint 13. From what I can tell, changes to mime handling for opening directories has broken the java Desktop api. I was able to work around the problem by editing
~/.local/share/applications/defaults.list
and adding this line
x-directory/normal=nautilus.desktop
I'm running Mint 13 Cinnamon with java version "1.7.0_05"

I can't confirm the error. I took your code and constructed a main method around it, and everything works as expected. I don't exactly know where the default applications are set (in my case PCMan was opened instead of usual Nautilus, but it should fulfil its purpose in the end).
Over at java.awt.Desktop.open doesn’t work with PDF files? I have found a link pointing to an issue in Suns (Oracles) bug tracker stating that the method for opening files using AWT isn't reliable even on Windows. Maybe you should think of alternative ways of opening such applications. Furthermore AWT is deprecating soon almost for sure.
If you are utilizing SWT in your application, you could use org.eclipse.swt.program.Program.

I was running into the same issue and decided to give Java 7 a whirl. I'm running java version "1.7.0_147-icedtea" on Ubuntu 11.10_x64 and am able to open file locations in Nautilus quite happily now.

I have the same issue on my Linux Mint (and not in Windows).
That link helped me :
Troubles with java.awt.Desktop browse() method.
This seems to work on my Linux Mint-KDE.
I changed the line
Desktop.getDesktop().desktop.open(new File("/home/user/mypath"));// this throws IOException: Failed to show URI (except in Windows)
with
Desktop.getDesktop().desktop.open(new File("///home/user/mypath"));// this launches Dolphin
or with
Desktop.getDesktop().desktop.open(new File(new URI("file:///home/user/mypath").getPath()));// this launches Dolphin
Dolphin was launched with my folder "mypath". But I found no way to open a file like a pdf or txt on my Linux while it works on Windows with the first code.
(Java 1.8.0_25, Netbeans 8.02, Linux Mint 12 KDE)

I have the issue with Kubuntu 18.04 and java 11. It was solved with
sudo apt install libgnome2-0 gvfs
see https://bugs.launchpad.net/ubuntu/+source/openjdk-8/+bug/1574879/comments/5 for details. java.awt.Desktop works with Gnome not with KDE.