All Questions
47 questions
0
votes
0
answers
36
views
Linux Server swap memory problem
I have the same problem on all servers running Java processes.
I have lots of available memory. But my swap is full of Java-related pages.
But the system never cleans its swap, Java pages stay there &...
- 1
0
votes
0
answers
54
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 ...
- 13.7k
2
votes
0
answers
364
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
2k
views
Refer another Java version in a systemd service file
I have an application which requires JAVA_HOME environment to be set for a successfull running. On the RHEL server, however the current version of java points to "openjdk version "1.8.0_302&...
- 111
0
votes
0
answers
3k
views
How to verify the enabled Ciphers through OpenSSL in RHEL 8.5
Our Java Application is functioning on RHEL 8.5 OS platform with TLSv1.2 protocol. Here, to improve the security, We want to enable only a few ciphers and need to block others.
CIPHERS TO BE ENABLED:
...
- 21
1
vote
0
answers
1k
views
how to set the value of Hive Metastore heap size
we have hadoop cluster ( based on ambari platform ) , when hive metastore installed on two machines
Sometime during job running ( we runs the queries from presto ) we saw job failure due to heap size. ...
- 13.7k
0
votes
1
answer
222
views
RHEL7 - very long start times on JRE
I'm using RHEL7, and I've ran into problems with Pycharm where it takes a very long time to start, a few minutes. According to the logs, it's mostly waiting for the JRE/JVM to start. So I tried to ...
- 111
0
votes
0
answers
627
views
javac -version command not found error in rhel 7.3
I followed this documentation to install java-1.8.0-openjdk-1.8.0.272.b10-1.portable.jdk.el.x86_64.tar.xz into RHEL 7.3.
In section 2.4. Installing OpenJDK on RHEL using an archive,
at the last step, ...
0
votes
1
answer
368
views
Couldn't load JVM and says cannot open shared object file
created a brand new Linux VM on azure cloud. Installed JDK 1.8 and setup the JAVA_HOME path also.
When running a vendor provided command it says
Error 58000: Couldn't load JVM: /usr/lib/jvm/java-11-...
- 227
1
vote
1
answer
5k
views
alternatives java -OpenJDK RHEL
I have the following setup (on multiple machines with RHEL7):
$ which java
/usr/bin/java
$ ls -ltr /usr/bin/java
/usr/bin/java -> /etc/alternatives/java
$ ls -ltr /etc/alternatives/java
/etc/...
- 369
0
votes
0
answers
581
views
How to search for dependencies for Java 8 yum install?
I inherited ansible playbook that installs java 1.8.0_181 via yum module on rhel server. My plan is to upgrade to java 1.8.0_221. While reviewing the playbook, I noticed it would install copy-jdk-...
- 885
0
votes
2
answers
3k
views
java -version and $JAVA_HOME display wrong information
I have a RHEL 7 server.
Installed java version is jdk1.8.0_151
# ls -l /usr/java
total 0
drwxr-xr-x. 8 root root 255 Apr 24 14:10 jdk1.8.0_151
I set JAVA_HOME location and added bin directory to ...
- 207
0
votes
1
answer
285
views
JVM memory + dose heap size Xmx values have impact on consuming memory
we have linux redhat machines with service ( service is based on java )
for now service consume 1.5G memory , and the heap size set to Xmx2G
let say we increase the heap size to Xmx10G
dose this ...
- 13.7k
0
votes
1
answer
3k
views
download java-1.8.0-openjdk-devel from epel repo
we have redhat machine - version 7.2
we installed the epel repo as the following
rpm -ivh https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
yum install epel-release
yum ...
- 13.7k
2
votes
1
answer
605
views
systemctl stop not stopping all process in redhat
I am starting a service using systemctl ,but I am facing issue to stop the service in redhat system.
the service file I am creating :
[Unit]
Description=/home/agenttest
After=syslog.target
[Service]
...
0
votes
0
answers
1k
views
java.net.SocketException: Network is unreachable on my Red hat 7 linux Server
So I have a java app on a linux red hat server that is accessing login.microsoftonline.com and graph.microsoftonline.com.
I can curl those domains and they respond.
I have imported the certs for ...
- 101
0
votes
2
answers
3k
views
yum + dependencies not logical when installing openjdk
we are tryng to install the java-1.8.0-openjdk-devel-1.8.0.161-2.b14.el7.x86_64.rpm
yum localinstall java-1.8.0-openjdk-devel-1.8.0.161-2.b14.el7.x86_64.rpm
Loaded plugins: langpacks, product-id, ...
- 13.7k
1
vote
1
answer
6k
views
jstat not found even though we installed java JDK
We installed the following RPMs (part of the Java development kit), on Red Hat Enterprise Linux 7.5:
$ rpm -qa | grep jdk
java-1.8.0-openjdk-headless-1.8.0.171-8.b10.el7_5.x86_64
java-1.8.0-openjdk-1....
- 13.7k
2
votes
3
answers
12k
views
How to completely uninstall java from RHEL?
When I do which java I get the following output:
which java
/dir/java/bin/java
I have already uninstalled java rpm using the following
`rpm -qa | grep -i java`
rpm -e rpm-name
Still java is not ...
- 181
1
vote
1
answer
638
views
MySQL Java connector still using old java version?
Installing mysql-connector-java-8.0.15-1.el6.noarch.rpm (available here ) shows libgcj package as a dependency.
Installing libgcj creates below file:
/usr/bin/gij
$/usr/bin/gij -version
java version ...
- 109
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 . ...
- 3,376
1
vote
1
answer
10k
views
Process running out of open file handles
My application which is based on two Java processes that interchange data over a http connection runs ouf of files and produces this error message:
Aug 14 11:27:40 server sender[8301]: java.io....
- 791
1
vote
0
answers
603
views
How to find evidence of performance issues caused by too many threads on linux
We have a RHEL 5 server, with 16 CPU cores, that runs a number of Java processes that get batch jobs submitted to them. Each java process has about 80 threads that are used to process these jobs. ...
- 152
0
votes
2
answers
9k
views
what is the repo in order to install jar file on redhat 7
what is the repo ( under /etc/yum.repo.d ) , in order to install jar command ?
yum install jar
Loaded plugins: langpacks, product-id, search-disabled-repos, subscription- manager
This system is ...
- 423
1
vote
1
answer
3k
views
Getting different default java versions for different users in linux
how to set different versions of java to different users in Linux
for example if we login as root then the default java version must be jre-1.8.141 and if we login as the normal user say (rob) then ...
- 11
0
votes
1
answer
1k
views
RPM database not seeing file installed as part of RPM
Intro:
The following was done on a RHEL 6.9 32bit OS.
I installed the oracle (not openjdk) version of JRE rpm using the
rpm -Uvh
command.
I then built a package using rpmbuild that requires ...
- 918
-1
votes
1
answer
63
views
SSL Certificate not showing when request is sent to the application
i have a java keystore which 2 certificate chains has been installed. a CSR was generated and signed by a CA and both certificate with corresponding CA's were installed. however when i send a request ...
- 11
3
votes
1
answer
22k
views
Why do I see "Unable to locate tools.jar. Expected to find it in ...." when I run ant (on RHEL 6.6) even though the path is set [closed]
I created a script in /etc/profile.d and named it jdk_home.sh. The contents of jdk_home.sh are as follows :
#!/bin/sh
export JAVA_HOME=$(readlink -f /usr/bin/javac | sed "s:/bin/javac::")
export ...
- 247
2
votes
2
answers
17k
views
Permission denied to cacerts file - SSL
I have installed a Red Hat 6.8 machine, on which I have installed a certificate on the default keystore 'cacerts' successfully. When trying to invoke a software which is using SSL and is trying to ...
- 33
2
votes
0
answers
1k
views
task java:14736 blocked for more than 120 seconds
I have a Java EE application running in Red Hat 6 with Java 7 and Wildfly 9. The application has been running well sometimes, suddenly the response time makes the application unusable and I have to ...
4
votes
2
answers
54k
views
How to verify if Java is installed on rhel
I stood up rhel VM. I was curious if JDK is installed or not so that I ran a command from a shell (bash).
whereis java
It returned:
java: /usr/bin/java
So I navigated to the path in order to ...
- 885
0
votes
1
answer
313
views
redhat + how to find the oracle JRE version 1.7 from redhat site
I am searching the JRE 1.7.x version from red-hat site by yum command
bot not find anything
yum list | grep java | grep "1.7" | grep -i jre
no such patch
or maybe redhat not hold JRE 1,7 patches?...
- 1,527
1
vote
1
answer
5k
views
Jre installation have no /usr/bin/java file?
I need to install a specific older version of JRE on a RedHat machine.
So I downloaded jre-1_5_0_10-linux-i586.rpm and copied it into /opt/local. Then I ran sh ./jre-1_5_0_10-linux-i586-rpm.bin and ...
- 111
0
votes
1
answer
214
views
Java problem - RHEL
I have RHEL in a test environment and I wanted to install a program that initiates a script that mandates java. The script tests for Java binaries folder.
I tried first to choose the java/bin ...
0
votes
2
answers
967
views
java installation in RHEL
while installing java in redhat i'm facing some problems..i've attached the screen print.
i unzipped the file using tar command .once i created the softlink for it ,i should be able to see java ...
1
vote
0
answers
837
views
Java related error met when installing COMSOL
I would like to install a software called COMSOL on Redhat (Red Hat Enterprise Linux Server release 6.4 (Santiago)) cluster. COMSOL is designed as a Windows software, and its installation requires X ...
- 111
0
votes
1
answer
449
views
When I execute a .run file as <user> it works fine. If I sudo run it, it cannot detect Java
I am trying to execute a .run file that will install some applications. I'm installing the application in /opt/... When I run it without sudo, the installer runs correctly but cannot write to /opt/. ...
- 3
1
vote
0
answers
947
views
java version not found in redhat
My OS is redhat linux. It's having the default java 1.4.2, but I need java 1.7.45,
for that I am trying as follows:
/usr/sbin/alternatives --install /usr/bin/java java /u01/java7/bin/java 5
/usr/sbin/...
- 11
2
votes
0
answers
1k
views
How can the RES memory reported for a Java process be higher than the VIRT memory?
I've been monitoring a Java process (Oracle Weblogic) using TOP and have observed that sometimes the following will happen:
RES will increase from it's usual stable level of 2,097,152 KB up to almost ...
- 121
1
vote
1
answer
1k
views
Problem running "selinux sandbox" with java
I am trying to sandbox a java application using selinux sandbox.
System details: Redhat 6 | x86_64 | no x server install | jdk7 from oracle tar.gz version | cgred and cgconfig are stop
The cmd ...
- 109
0
votes
1
answer
2k
views
screen command cannot find java executable
I'm trying to execute java from screen:
screen -S my-java-app -d -m 'java -jar -Xms512m -Xmx2048m my-java-app.jar'
but seems that screen does not know the java command. Running java without screen ...
- 653
1
vote
1
answer
1k
views
OpenJDK update in RHEL 6
We need to apply the JDK updates to one of the RHEL 6 servers. How do I apply the patch if I have the RPM package available, which I have downloaded from the internet. Searched a lot on the internet ...
- 11
2
votes
0
answers
657
views
Java plugin not working with FireFox 24.3.0 on Red Hat Enterprise Linux 5.10
In the about:plugin tab, there is not Java plugin. I have created the symbolic link as suggested. The output of the 'ls -al' command is:
lrwxrwxrwx 1 shehab shehab 58 Jun 4 11:21 libnpjp2.so ->
...
- 121
3
votes
2
answers
5k
views
Hugepages in linux - how to make sure that java process will start using hugepages
I'm running java server on Red Hat Enterprise Linux Server release 5.9.
Recently I started to use HugePages as it has some advantages I would like to use.
System was configured correctly (as many ...
- 31
1
vote
1
answer
340
views
CentOS5, RHEL5, Java dependent Packages, Alternate JVM/JDK
Specifically regarding Java dependent packages, such as ant. Is it possible to install them via rpm, when using an alternate JVM/JDK? For example, If I install the Oracle JDK, can I use an ant ...
- 5,009
2
votes
1
answer
4k
views
How to force a particular version of Java?
I am on a RHEL 5.5 64 bit box. The systems engineer installed the 64-bit Java VM under /usr/bin ; however, I needed a 32 bit VM which he installed in /opt/jdk1.6.0_35. But now, everytime I do java -...
- 123
67
votes
4
answers
972k
views
How to find path where jdk installed?
I've installed jdk1.7.0.rpm package in RHEL6.
Where I do find the path to execute my first java program?
- 779