B4J Question Shell not running jar file

[aaronk]

Hi,

I am using an non-UI app and trying to run a .jar file with shell.

When I use command line and I use the following it works:

/opt/jdk-14/bin/java -jar /opt/CloudServer/tool.jar Args1 Args2 Args3 Args4

However, when I use the following code in my B4J app it comes up with an error..
(not 100% sure if this is the way in doing this)

    Dim shl As Shell    'jShell Lib v1.52
    Dim Args As List
    Args.Initialize
    Args.Add("-jar")
    Args.Add("tool.jar")
    Args.Add("Args1")
    Args.Add("Args2")
    Args.Add("Args3")
    Args.Add("Args4")
    
    shl.InitializeDoNotHandleQuotes("shl","/opt/jdk-14/bin/java", Args)
    shl.WorkingDirectory = "/opt/CloudServer"
    shl.Run(10000)

Wait for shl_ProcessCompleted (Success As Boolean, ExitCode As Int, StdOut As String, StdErr As String)
    Log(Success & "; ExitCode = " & ExitCode)
    Log("StdOut = " &  StdOut)
    Log("StdErr = " &  StdErr)

The error it shows is:

false; ExitCode = -559038737
StdOut =
StdErr = org.apache.commons.exec.ExecuteException: Execution failed (Exit value: -559038737. Caused by java.io.IOException: Cannot run program "/opt/jdk-14/bin/java" (in directory "/opt/CloudServer"): error=13, Permission denied)

I can't work out why it's not working in B4J when it works fine in command line.

Any one know why this doesn't work ?

 

[aeric]

Maybe try with array instead of a list.

The error shows permission error. Maybe you need to add sudo to your command.

I think better move or copy the tool.jar to /home/yourusername/YourDirectory

 

[DonManfred]

Maybe try with array instead of a list.

the error tells that he has no permission to run /opt/jdk-14/bin/java

Caused by java.io.IOException: Cannot run program "/opt/jdk-14/bin/java" (in directory "/opt/CloudServer"): error=13, Permission denied)

I´m not a linux pro but it must have to do with userrights maybe.

 

[LucaMs]

Perhaps you already have an instance of the same project active in that directory?

 

[aeric]

the error tells that he has no permission to run /opt/jdk-14/bin/java



I´m not a linux pro but it must have to do with userrights maybe.

Ya, I just saw it afterwards.

 

[aaronk]

Maybe try with array instead of a list.

I tried that, but had the same result. I also added sudo as well.

the error tells that he has no permission to run /opt/jdk-14/bin/java

Yeah, that is what I thought but I can't work out why since it works fine when running it in command line. I even ran my B4J app as sudo so it should give it full access from what I can work out.

Perhaps you already have an instance of the same project active in that directory?

I changed the package name to something else but still got the same result.

If I run it on my Windows machine (as per below) it works, but can't get it to work on Linux (Ubuntu).

Dim shl As Shell    'jShell Lib v1.52
        Dim Args As List
        Args.Initialize
        Args.Add("-jar")
        Args.Add("tool.jar")
        Args.Add("Args1")
        Args.Add("Args2")
        Args.Add("Args3")
        Args.Add("Args4")
        
        shl.InitializeDoNotHandleQuotes("shl", "java", Args)
        shl.WorkingDirectory = File.DirApp
        shl.Run(10000)
        
    Wait for shl_ProcessCompleted (Success As Boolean, ExitCode As Int, StdOut As String, StdErr As String)

    Log(Success & "; ExitCode = " & ExitCode)
    Log("StdOut = " &  StdOut)
    Log("StdErr = " &  StdErr)

 

[aeric]

Are you using some libraries like jSerial?

Serial in Linux

Hello All, I am trying to use the JSerial lib in ubuntu with no success. Anyone knows if I can use this Lib in Linux ? I get an exception error when i try to open the com1 (its working and reported in system) /dev/ttyS0 And even a simple application to list all ports serial.listports returns a...

www.b4x.com

 

[aaronk]

Are you using some libraries like jSerial?

No, that opens the serial port and does things with the serial port.

I am trying to do Shell. (jShell)

 

[aeric]

I think better move or copy the tool.jar to /home/YourUserName/YourDirectory

Have you tried this?

 

[aeric]

Are you trying to write a file in the /opt/xxxx directory?
Unless you use "sudo", you may not have write permission.
Use /home directory and you don't need sudo permission.

 

[aaronk]

Have you tried this?

Yes, I have tried that.

The CloudServer.jar file runs, but when it tries to run the code to call the other jar file that is when this error shows.

/opt/jdk-14/bin/java -jar CloudServer.jar

Error Shows:

false; ExitCode = -559038737
StdOut =
StdErr = org.apache.commons.exec.ExecuteException: Execution failed (Exit value: -559038737. Caused by java.io.IOException: Cannot run program "java" (in directory "/home/CloudServer"): error=13, Permission denied)

 

[aeric]

Why not just use "java" instead of "/opt/jdk-14/bin/java" as in your post #6 ?

 

[aeric]

How do you install Jdk 14?

Here is how I install:

wget https://www.b4x.com/b4j/files/java/linux_jdk-14.0.1.zip
sudo mkdir /usr/java
sudo cp linux_jdk-14.0.1.zip /usr/java
cd /usr/java/
sudo unzip linux_jdk-14.0.1.zip
sudo update-alternatives --install /usr/bin/java java /usr/java/jdk-14.0.1/bin/java 0
sudo update-alternatives --install /usr/bin/javac javac /usr/java/jdk-14.0.1/bin/javac 0

 

[aaronk]

It thinks I have a different version of Java installed.

I used to use Java8 but I upgraded to Java14 a year or so ago, and I copied Java14 into the directory and now I need to call it with the file path.

java -jar CloudServer.jar
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.UnsupportedClassVersionError: b4j/cloud/server/main has been compiled by a more recent version of the Java Runtime (class file version 53.0), this version of the Java Runtime only recognizes class file versions up to 52.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:756)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:473)
at java.net.URLClassLoader.access$100(URLClassLoader.java:74)
at java.net.URLClassLoader$1.run(URLClassLoader.java:369)
at java.net.URLClassLoader$1.run(URLClassLoader.java:363)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:362)
at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:352)
at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:621)

java -version
openjdk version "1.8.0_362"
OpenJDK Runtime Environment (build 1.8.0_362-8u372-ga~us1-0ubuntu1~18.04-b09)
OpenJDK 64-Bit Server VM (build 25.362-b09, mixed mode)

 

[aeric]

If you have multiple version of jdk, try choose one:

sudo update-alternatives --config java

 

[aaronk]

It only shows I have one version installed..

sudo update-alternatives --config java
There is only one alternative in link group java (providing /usr/bin/java): /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java
Nothing to configure.

I manually copied the Java14 folder from my computer to /opt/jdk-14 on the linux server using SSH.

 

[aeric]

It only shows I have one version installed..


I manually copied the Java14 folder from my computer to /opt/jdk-14 on the linux server using SSH.

You need to install using the commands:

sudo update-alternatives --install /usr/bin/java java /opt/jdk-14/bin/java 0
sudo update-alternatives --install /usr/bin/javac javac /opt/jdk-14/bin/javac 0

 

[aaronk]

I just ran those 2 commands.
I then ran: sudo update-alternatives --config java
Set my Java version.

Now when I check the Java version it shows the correct Java version.

java -version
openjdk version "14" 2020-03-17
OpenJDK Runtime Environment (build 14+36-1461)
OpenJDK 64-Bit Server VM (build 14+36-1461, mixed mode, sharing)

But still got the Permission denied issue. (I tried running it as sudo but got the same result)

/home/CloudServer# java -jar CloudServer.jar
Calling tool.jar...
false; ExitCode = -559038737
StdOut =
StdErr = org.apache.commons.exec.ExecuteException: Execution failed (Exit value: -559038737. Caused by java.io.IOException: Cannot run program "java" (in directory "/home/CloudServer"): error=13, Permission denied)

 

[aeric]

Something not right.
Can you share your terminal?
Is the path /home/aaronk/CloudServer or CloudServer is a username?
Do you modify the code in post #6?

 

[aaronk]

I just worked it out.

Looks like it might have been a permission thing.

I ran the following command and it fixed the issue.

chmod -R o+rx /opt/

Since Java was in that directory, it looks like I had to set the permissions for the whole directory and I must have not had it set in the past.

Thanks heaps for your help!