Questions tagged [java]
Java is a general-purpose programming language and a computing platform called the Java Virtual Machine (JVM). Use this tag when you are dealing with a java program, installing java, or configuring a java installation.
880
questions
-2
votes
0
answers
19
views
Error: Could not find or load main class ; can any one help please? [closed]
I have done reinstalling the vscode and jdk but still the problem persists can ony one come up with solution.
0
votes
1
answer
2k
views
attach to tty running a process
I have a systemd service file that runs a java program in another tty
[Unit]
Description=java program
After=network-online.target
[Service]
Type=simple
ExecStart=/usr/bin/java -cp "/home/user/...
CommunityBot
- 1
0
votes
2
answers
2k
views
Java programs not running in terminal
I have java 8 installed on fedora 20.
Any java program runs perfectly fine via eclipse but when I run the same program on terminal it reports an error saying 'could not load main class' . what could ...
- 10.5k
0
votes
0
answers
34
views
Error while installing openjdk [closed]
Got the below error while executing below command
sudo apt-get install openjdk-8-jdk
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
E: Unable to ...
- 3,172
0
votes
0
answers
17
views
"Failed to load swt-pi3" error in e2studio installer
I would like to install the latest version of Renesas' e2studio on my up-to-date Fedora 39 machine but I keep getting the following error:
$ ./e2studio_installer-2024-01_1_linux_host.run
Mar. 31, ...
- 437k
1
vote
2
answers
24k
views
How to fix Picked up _JAVA_OPTIONS: no options listed on Linux?
This issues is on Manjaro Deepin 15.9 linux DE. When I run java -version in terminal it outputs this:
Picked up _JAVA_OPTIONS:
java version "11.0.2" 2019-01-15 LTS
Java(TM) SE Runtime ...
CommunityBot
- 1
0
votes
0
answers
56
views
How to solve Missing X server or $DISPLAY when trying to change the loaded website in chromium
I am a newbie with using raspberry and
I am using chilipie-kiosk to develop a kiosk on a raspberry pi. The idea is when the Raspberry Pi starts, the Chromium browser is launched with a page that we ...
0
votes
1
answer
3k
views
How to schedule to run testng.xml file on terminal on linux environment?
I have scripted a Selenium automation testcase. I have generated the testng.xml file which should be executed on the linux terminal at a particular time of my need. Say I want to schdule to execute ...
CommunityBot
- 1
3
votes
4
answers
11k
views
Intellij IDEA: Unrecognized VM option 'UseConcMarkSweepGC'
I installed Intellij IDEA from on my arch using yay. I worked fine but recently it started doing this:
john@arch-thinkpad ~ [1]> intellij-idea-ultimate-edition
Unrecognized VM option '...
- 2,579
2
votes
2
answers
107
views
On Debian, how do I make a script that will rerun a Java program after it has stopped or crashed?
I'm running a Java server program that needs to be started with a shell script. The script needs to start the Java program again if it happens to crash or be stopped manually.
I found this script ...
- 67.3k
0
votes
1
answer
2k
views
Is -d64 required for java on linux?
We are generating scripts for running java on RHEL or an Amazon Linux ami. The scripts all now contain the -d64 option. We are using OpenJdk 1.8 64-bit. The oracle faq question When you download the ...
CommunityBot
- 1
0
votes
0
answers
36
views
JAVA_TOOL_OPTIONS="-Dos.name=Windows 7" -> Unrecognized option 7
I am trying to install the latest version of PSIM which is a windows application. I downloaded the latest version of JAVA as well as JAVA 8 (in case it doesn't like the latest) and set the variable ...
- 7,981
5
votes
2
answers
2k
views
Can I indicate that a .deb package depends on Java, but not specify what implementation (e.g. OpenJDK, IcedTea, Oracle)?
I have a .deb package that contains an app, which requires Java to function. However, I don't care which implementation they have installed (e.g. OpenJDK, IcedTea, Oracle), and I don't want to force a ...
- 799
5
votes
1
answer
2k
views
Java SDK on NixOS for IntelliJ
I have recently installed NixOS on my machine,
for Java development I have added IntelliJ CE 14.1.5 and the Oracle JDK 8.
However IntelliJ does not automatically recognize the path to the Java SDK
...
CommunityBot
- 1
1
vote
1
answer
1k
views
"No X11 DISPLAY variable was set [...]" when using java.swing
When I'm trying to run a Java GUI application from the command line, I get:
Exception in thread "main" java.awt.HeadlessException:
"No X11 DISPLAY variable was set,
or no headful ...
- 1
0
votes
1
answer
93
views
If I have a json string how do I calculate the number of bytes needed when stored?
I have a json string formatted displayed in a web page. What I am trying to understand is what is the size in terms of bytes that this json string requires.
If I copy and pipe to wc -c I get 1000 ...
- 546k
3
votes
1
answer
3k
views
Setting classpath for Java
I was trying to use a tool a tool written in java called "fastqc" (for people who are interested in what is fastqc.
when I tried typing the command :" fastqc"
I got the error:
Exception in thread "...
CommunityBot
- 1
2
votes
1
answer
45
views
When SIGTERM is received by a process, what happens to its children?
I am wondering what happens when a process receives SIGTERM and it has children spawned (e.g. JVM that has /bin/sh commands running).
Is there some sort of automatism or does the parent simply exit ...
- 7,981
0
votes
0
answers
25
views
Kafka with KRaft - what is listening on the random high port?
I'm in the process of writing some ansible to install Kafka on RHEL and I've got the service running and am about to configure the firewall to make the service accessible on the network.
When I look ...
- 998
-1
votes
3
answers
3k
views
Running JAVA in Cygwin through bash script
I've been encountering a problem with cygwin where I cannot run a jar file with an error that the file cannot be found.
If it were easier i would "translate" the java source in bash, but ...
CommunityBot
- 1
2
votes
3
answers
5k
views
org.eclipse.swt.SWTError: No more handles [gtk_init_check() failed] while running spoon.sh in ubuntu
When I am running spoon.sh file in Ubuntu I am getting the following error:
[santosh@sbx data-integration]$ ./spoon.sh
/home/decathlon/Pentaho-5.0.1/data-integration
org.eclipse.swt.SWTError: No more ...
CommunityBot
- 1
0
votes
2
answers
2k
views
Unable to build using Java OpenJDK 14. /bin/sh: javac: command not found
I've been tasked to work on updating a Java program that hasn't been touched for years and I'm running into issues building it using the latest version of Java OpenJDK 14.0.1.7-2 on Centos 7. When I ...
- 56
0
votes
1
answer
10k
views
JAVA_HOME should point to a JDK not a JRE
If anyone can help me with this, it would mean a lot as I've seen similarly answered questions for windows but not many or Linux. I am running I am running Linux mint 20.2 (Uma).
I have a problem ...
CommunityBot
- 1
0
votes
2
answers
3k
views
Unable to locate an executable at "/Library/Java/JavaVirtualMachines
Whenever I try to run any apt command on my Mac I get
Unable to locate an executable at "/Library/Java/JavaVirtualMachines/jdk-12.0.1.jdk/Contents/Home/bin/apt" (-1)
error.
My .bash_profile ...
CommunityBot
- 1
0
votes
0
answers
49
views
Hadoop Namenode heap size tuning
NameNode process is executed in Java virtual machine,
and Java object which NameNode creates is managed in Java virtual memory. As the fles or directories are created, inode objects and block objects ...
- 13.2k
0
votes
1
answer
3k
views
JAVA OPTS Xms Xmx MetaspaceSize MaxMetaspaceSize relationship with server resources
I have just started working with jboss application servers and recently we had a problem when trying to deploy an application in a new test server (RHEL 7), it happened that, when starting the jboss ...
CommunityBot
- 1
0
votes
1
answer
505
views
Install Java 6 to Debian Lenny
I'm trying to install old Java 6 to Debian Lenny:
sudo apt-get install sun-java6-jdk sun-java6-jre sun-java6-bin
Got this error:
Couldn't find package sun-java6-jdk
sources.list:
deb http://archive....
- 2,030
0
votes
0
answers
33
views
Why are four Jenkins build nodes suddenly having fatal problems finding things on the PATH?
In our overall organization, we run Jenkins 2.303.1 onprem. We run thousands of builds a day. The project I work on uses one Jenkins master and a set of about ten build nodes. We build a few hundred ...
- 1,001
1
vote
2
answers
2k
views
How do I run Jenkins with a specific working directory and a specific user account?
I am executing below jenkins.war with below command
jenkins -jar jenkins.war
But I want to specify to use below path while executing the war
`/data/jenkins`
and it should run as jenkins user . ...
CommunityBot
- 1
0
votes
1
answer
4k
views
CentOS 6.6; java 7: libjli.so cannot be found
Background:
I have written a Java program to capture network packets. The code uses a wrapper API around libpcap and works nicely – as long as I run the program via sudo.
I am now trying to figure out ...
CommunityBot
- 1
1
vote
2
answers
4k
views
No trusted certificate found when using Java for making request on HTTPS
I'm a Java developer and I need to use a particular version of java 8 (1.8.0_162) can't use OpenJDK either.
But, I'm getting this error when I try to connect / get / download / whatever from my java ...
- 403
0
votes
0
answers
41
views
Running a Java Abstract Window Toolkit application within a Docker container under Wayland
In the last years I ran a Java Swing application within a Docker container by running:
docker run -u 1000:1000 --rm --name etax_zug --hostname etax-zug \
-e DISPLAY=unix:0 \
-e XAUTHORITY=/tmp/...
- 101
0
votes
1
answer
2k
views
Java 21 on Raspberry Pi 5
I'm not able to install Java 21 on Raspberry Pi 5. I download ARM versions from openJDK and Oracle, but both don't work for me.
When typing ./java it prints: "No such file or directory" (I'm ...
- 101
2
votes
2
answers
5k
views
Arch linux - Error during update of packages: jdk-openjdk and jre-openjdk are in conflict
When I try to update my system I get jdk-openjdk and jre-openjdk are in conflict error:
This is log of the update attempt:
:: Synchronizing package databases...
core is up to date
extra is up to ...
- 153
1
vote
1
answer
2k
views
Where does keytool command logs?
I want to know in which file the keytool command logs all the information.
i.e., when I execute the below command:-
keytool -import -file ca-certificate.cer -alias sample -keystore /root/keystore.jks
...
- 105
0
votes
1
answer
1k
views
Error: could not open `user_jvm_args.txt`
This is my first time making a bash script into a service and I'm running into an error where the service fails because it can't open a text file that is used for java arguments (user_jvm_args.txt). I ...
0
votes
1
answer
40
views
shell script invoke java, keep existing on linux
we have a bash shell script which invoke java program. will it be happened that the java ends/complete but the process of still on the process list?
below is the content of execute, which invoke a ...
- 97.1k
1
vote
2
answers
454
views
Java: what exactly does a headless install mean?
I'm installing Java and Tomcat on a headless server. The client doesn't have Java and just sees a webpage.
Should I install openjdk-17, or openjdk-17-headless?
- 437k
0
votes
0
answers
14
views
Integrate java app installed through flathub to GTK
I have installed sweethome3d via flathub(https://flathub.org/apps/com.sweethome3d.Sweethome3d). Expectedly, the look is not integrated with Adwaita or whatever GTK theme and icons I am using.
Is there ...
- 1,639
1
vote
0
answers
58
views
100% memory consumption when running Jetbrains IDE for 5 min
Fresh install of Arch Linux causes major memory leaks upon opening JAVA based applications, or Jet Brains applications to be exact.
Memory starts off fine but within 5 minutes its up over 90%, opening ...
- 242k
0
votes
0
answers
101
views
Mailx call in shell script suddenly sending blank messages
Similar to what was reported in posting, MAILX sends an email but with a blank subject and body text, I have an Oracle EBS 12.2 server that's using a concurrent program (java) to invoke a shell script ...
- 1
0
votes
0
answers
211
views
Uninstall Java 8 openjdk-8-jre-headless to upgrade to openjdk-11-jre-headless
I've tried several methods of removal of the package. apt remove openjdk-8-jre-headless, apt purge openjdk-8-jre-headless, I've tried to dpkg-l | grep openjdk to find the packages listed, Each time I ...
- 29.5k
6
votes
4
answers
20k
views
How to do HmacSHA256 using openSSL from terminal?
I need to perform the following Java snippet using OpenSSL from the command line:
private byte[] hmacSha256(byte[] key, byte[] payload) throws GeneralSecurityException {
Mac mac = Mac....
- 391
0
votes
1
answer
95
views
Installing Ant is overriding Java Installation
I am trying to install ANT after installing java. My java in Sun Java.
pc19@pc19-H110:~$ java -version
java version "20.0.2" 2023-07-18
Java(TM) SE Runtime Environment (build 20.0.2+9-78)
...
- 437k
0
votes
1
answer
33
views
How to replace stock java with downloaded binary?
In Debian Stable the latest openjdk version available is 17.
$ which -a java
/usr/bin/java
/bin/java
$ java --version
openjdk 17.0.8 2023-07-18
OpenJDK Runtime Environment (build 17.0.8+7-Debian-...
- 440
6
votes
2
answers
10k
views
setting JAVA_HOME and PATH with update-alternatives
EDITED
The question was more about bash script them java environment and thanks for those whom had the patience and spare the time to reply me. I am much obliged.
As for the Java environment I started ...
2
votes
0
answers
217
views
Java process getting terminated in Redhat by SIGTERM from Systemd
I'm starting a Java process using nohup and & (running it in the background). This process gets terminated frequently. There is no pattern on when it is getting terminated. From the application (...
- 121
1
vote
1
answer
527
views
How do I install Java for all users?
I need to install Java 8 on my raspberry pi. I used SDKMan to do so, following this tutorial.
All works well only if I use java from my admin account (the one I used to install it). Trying to run java ...
- 91
0
votes
0
answers
105
views
Detecting a Pipewire Virtual Sink in Java
I'm trying to set up a Virtual Sink using Pipewire which I've done successfully, however, I am having trouble detecting it in Java though other applications have no problem detecting it.
I can play ...
- 1
2
votes
3
answers
3k
views
How to use the Java plugin in Firefox 52 in Ubuntu?
I am using Ubuntu Mate Xenial and can't find a way to run Java in Firefox 52.
- 155