Questions tagged [java]

Programming language and runtime environment that allows compiled Java programs to run unchanged on most hardware and software platforms

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36 views

Ubuntu 20.04 update destroyed Java/Mysql app performance

I'm working on a Java / MySQL app and test runs of batch processing were taking 3-4seconds on Ubuntu 18.04. I made the upgrade to Ubuntu 20.04 last night, and kept the same mysql conf file, and now ...
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16 views

trying to implement function in python using regex to validate input? [closed]

i am trying to implement this function in Python using Regex: import re def validateusername(username) return None print(validateusername("tony_alexandre")) #valid print(validateusername(&...
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8 views

AnonPage memory leak

Our service notices some hosts having large anon pages like these from pmap -x: 0000000580000000 9486088 9479172 9479172 rw--- [ anon ] meanwhile, our other regular hosts have much smaller anon ...
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21 views

Deploy java “trusted.certs” by GPO to all users of domain

In my domain, we have a couple of applications that establish a connection by java: when users do the Windows logon the box windows of Java appears and ask ""Do you want to run this program?&...
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1answer
59 views

Minecraft server constantly crashing [closed]

I tried to make a VM instance on the Google cloud platform for my Minecraft server. But It's constantly crashing after a few hours. It says that I don't have enough memory but I think I allocated more ...
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114 views

Confusion with memcache size increase

I'm facing issues with my memcache recently as we received lot of data requests. So, I used telnet command to get some stats around the memcache. For the production environment, I saw that there are ...
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4answers
92 views

How do I install 2 different versions of java on the same machine from EPEL

Title says it all. I want to have 2 versions of java on the same machine. For example 14.0.1.7 and 14.0.2.12 (which are both in EPEL7 repo). If i install them one by one via yum, yum will remove first ...
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18 views

Does http.nonProxyHosts support the subnet/CIDR IP syntax 172.16.0.0/12?

Does http.nonProxyHosts support the subnet/CIDR IP syntax 172.16.0.0/12 (private IP addresses)? The alternative would be quite complicated: 172.16.*\|172.17.*\|172.18.*\|172.19.*\|172.20.*\|172.21.*\|...
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2answers
31 views

How to diagnose what Java process is doing in kernel space

We have a problem with one Spark (Java) application on our Hadoop cluster. When this workload gets scheduled on 3 machines in our cluster kernel space CPU usage gets a very high. Example recording ...
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0answers
30 views

Tomcat sends response 400 out of nowhere

I'm running a server on Ubuntu 18.04 with Tomcat and I saw the following in the access log. <my.ip> - - [13/Sep/2020:19:33:40 +0000] "POST /path/path HTTP/1.1" 200 53 <my.ip> - - ...
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1answer
27 views

Forward incoming connection to another server, but forward the connection IP address as well

I have two Linux servers. I need to forward the incoming connection from server A (1.1.1.1:25565) to server B (2.2.2.2:25598) (as an example). I've tried multiple iptables rules, with partial success. ...
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16 views

JBoss 7.1 set maximum-session-cache-size to Elytron Security Provider via jboss-cli

There is configuration issue, while setting some default params in the new Security provider(elytron). The legacy security provider (prior to Jboss 7.1), has a different cli command to overwrite the ...
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1answer
36 views

Request Whitelisting for Java 7 Deployment

I just took over a project last month.When I tried to deploy the project, it popped up a message told me to migrate to Java 8 application or add to whitelist. I have tried the steps on the document of ...
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18 views

Do I need a ssl certificate for testing with selenium via vps server?

i am trying to Set up a vps Server with which i want to test Websites in the open Web by opening different chrome windows with the help of selenium. Now i wonder if i need a ssl certificate for doing ...
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20 views

Java application in RDP window deploys to host PC

I am working with a web application that deploys java components to the client desktop. Those java apps then run on the client desktop to perform various functions. When using this web application ...

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