Questions tagged [jvm]

JVM (Java Virtual Machine) is a program that loads and runs Java applications by converting the bytecodes into machine executable code.

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java thread dump analysis

For context: we have been having some issues with garbage collection where we see it taking 15-40 seconds, during this time the application is in a 'paused' state. Here's what we see in our gabage ...
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Is there a 64-bit version of Groovy for Windows 10?

Is there a 64-bit version of Groovy? My OS is Windows 10. I have been looking for days with no luck. The problem I have is that I need to use a 64-bit JVM with Groovy so that I can maximize the JVM ...
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SIGSEGV error: Problematic frame c2 java.util.TreeMap.put

I am running a multi-threaded java program that reads a file and generates its sorted splits (i.e., each mini-file is sorted). While doing so, I am also generating counts/frequencies of the number of ...
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OWB Designer center showing error- Unable to find JVM

OWB is unable to locate the JVM in my machine for some reason. The following message is displayed on Designer Center terminal: C:\app\XANE\product\11.2.0\dbhome_1\owb\bin\win32>call setowbenv.bat ...
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How to restart a JAVA Eclipse workbench on a different JAVA VM?

I have been trying to create my first web service on JAVA Eclipse. But whenever, I am trying to compile my Web Service project the following error, JAVA JVM error I have tried these methods for ...
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1answer
19 views

Puppet db certs dissapear?

Nothing in the configuration has changed since the launch of the service, only the license key. The "cacerts" file itself is a symbolic link. Someone faced a similar problem? root@puppet:/home/user# ...
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switching to IBM JVM

when running my code on an IBM JVM I get java.security.cert.CertificateException: No name matching [hostname] found when using the same certificate which works on an oracle JVM. I can tell that when ...
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Frequent Java (JVM) hard crashes

This is driving me nuts. I'm a java developer, I use Eclipse. Both the programs I write AND Eclipse (java IDE) itself is frequently crashing - hard crashing. It always seems to be inside JVM.dll when ...
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Eclipse silent crashes

This thread is dead, it turned out my entire Java install was corrupt. After removal and repair tool failed to fix it I formatted my disk and reinstalled windows. (not the best possible solution, I ...
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1answer
28 views

Java application requiring LD_PRELOAD setting due to signal chaining says LD_PRELOAD is null

I am troubleshooting the failure of a larger java program on a server. However, I have been able to reproduce the problem with a super basic java program that just outputs the environment variable ...
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1answer
593 views

JVM Heap size as a ratio of system physical RAM (Weblogic)

How much should the max JVM heap size be set for a specific size of Physical RAM. e.g. With 8GB RAM, I can set the MAX heap size for a server app as 3GB. This question is specific to Java 1.8 and a ...
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ParallelGCFailedAllocation exception in JVM?

I was running a software load test on a JVM, and ran into this exception in hs_err_pid15912.log. I'm not much of a JVM person. Can anyone tell me what it means? Is it possibly a GC bug in the JVM? # ...
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Are there performance differences between OpenJDK and Oracle?

Oracle has recently decided to start charging for commercial use of their JVM. Our team has started to switch over to using OpenJDK instead, and are finding everything seems to be working fine, ...
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Heroku Procfile Configuration for Spring Boot being overridden by default values

I have a spring boot application and I keep getting R14 memory warnings on heroku. I believe the problem lies with the infrequent garbage collection and heap size as manually triggering the garbage ...
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358 views

Java application response is slow if Linux cache consumes entire system free memory

I am running two Java-based application on my server with 32GB of RAM,16 core CPU. Apart from this I just have MySQL community server 5.6.16. The Java applications are assigned 10 GB of overall memory....
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1answer
450 views

How to get a running Jar's file path?

When I run some jar file, the process created is an instance of the JVM, which executes the jar. How can I know what jar file a JVM process is running? I would like to use this information to retrieve ...
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Intermediate code by virtual machines

I was reading about instruction set and I came across following line from WIKI Some virtual machines that support bytecode as their ISA such as Smalltalk, the Java virtual machine, and Microsoft'...
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What is the difference between a virtual machine on which you can run an virtualized OS on it and a virtual machine like Java VM? [duplicate]

It seems that they are quite different things but everybody uses the same term for them.
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1answer
245 views

JVM variable not set correctly enough for Android Studio

Having trouble firing up android studio. I get the following message: The environment variable JAVA_HOME (with the value of ?C:\Program Files\Java\jdk1.7.0_79\jre and every other variation I can guess)...
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2answers
5k views

What is java virtual machine and what does it have to do with Java?

I was trying to install eclipse on my Macbook Air. When I run the installer I get this message There seems no official page dedicated to JVM like other Apps. When I search "install jvm" I was lead ...
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80 views

How relevant today to use JVM? [closed]

Don't we have enough amount of compilers today (for various platforms) ? Python for example - it is considered as a crossplatform langauge.
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Applying Java minor updates

A bit of a noob question here, but I can't seem to update my Java from 8u31 to 8u45 or 8u51 (Linux Mint 17.2). I can switch between my Java 7/8/9 easily, but these minor versions are really annoying ...
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158 views

Hangs of Lotus Notes (composite) mail for several seconds - how to debug

Question: How can I profile Java part of composite application in Lotus Notes client (based on Eclipse/OSGi)? Background: Opening any document from view (does not matter which one: it happens in ...
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1answer
688 views

Does JVM depend on the architecture of the processor?

From what I understand, JVM needs to talk to the operating system as well as it generates machine code commands for the processor. If my understanding is correct, when I try to download jre how does ...
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1answer
161 views

Ignoring APT dependencies for Java packages

I would like to use some Java applications on Ubuntu that are packaged as .debs and hold java-common & friends as a dependency. However, I do not wish to use the JVM that is packaged with Ubuntu ...
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297 views

Slow Windows Application Startup

I have Windows 8 Pro/i5 3320M laptop with 8GB memory. Java based applications such as Eclipse, Phpstorm takes about 15-30 mins to load. (i assume issue is with java apps, others work fine). I tried ...
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1answer
745 views

How to interpret this htop output?

CPU is pinning on one of our app server (Java) machines. When I run the htop command on the machine and switch to Tree View I see: |- java -Dcom.sun.management.jmxremote -Dfizz=buzz | |- java -Dcom....
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Does Java Virtual machine generate 0s and 1s?

I am sorry, this is a very basic level computer science question. Does Java Virtual Machine generate 0s and 1s or does it generate assembly language code? If it does generate assembly language code, ...
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741 views

Java (SE) program execution is too slow on Debian Wheezy… do I need to “tune” the JVM?

SuperUsers. I wrote a desktop program to execute a simulation process (not worth copying the code here... it's quite a long program). If I run it on a MacBook Pro (Intel Core i7 2.2 GHz, 4GB RAM), it ...
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367 views

Windows running 2 different version JVMs in Windows for different browsers?

Using windows xp/7/vista. Is it possible and if so how; can I run 2 different versions of Java so 2 different browsers (firefox/chrome/IE/anyother) can use the specific JVM. Without the use of ...
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632 views

Wrong OEM while trying to use FlashTool. (Android Rooting)

I am trying to follow this link to install FlashTool so that I can root my Micromax Canavas HD. My Dev Enviornment is Ubuntu 12.04 LTE 64 bit with support libs for 32 architecture. I as well changed ...
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How to run .j filetype on a Linux machine?

The title says everything else for itself. I've tried to execute this .j file for hours now. As far as I understood it contains java byte-code, which can be executed by the Oracle Java Virtual Machine....
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3k views

Are there any JVM running on GPU

I haven't seen any, but are there any JVM that is build for CUDA or DirectCompute? I've seen the advantage of having an application run in the CPU as well as offload process to the available GPU.
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Does Android or Java use more power since it's running on a virtual machine?

Since Android applications run on a JVM (Dalvik VM) which is basically a virtual processor, and every virtual instruction has to be mapped to the underlying chipset's native instruction, does this ...
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70 views

Oracle Session Numbers Going Crazy - What is the best strategy to over come this issue?

We have a JVM web application which is running on Oracle Application Server and it uses commons-dbcp (http://commons.apache.org/proper/commons-dbcp/) and implicit connection pooling. Our db is Oracle. ...
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11answers
103k views

How to fix font anti-aliasing in IntelliJ IDEA when using high DPI?

I use a higher DPI setting which makes IntelliJ (actually Android Studio) have really messed up fonts. I use MacType which renders my fonts beautifully elsewhere, but I guess Java VM somehow ...
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1answer
201 views

Java crashes on startup with an UnsupportedCharsetException

I'm under Windows7/64, recently, everything related to Java stopped working(Netbeans, Jdownloader...) Even if i run the command line: java -version i get this exception: Error occurred during ...
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163 views

Running different programs via ssh

I got some problem when I tried to run different programs via SSH. The problem is, let's say I have 2 different java programs, then I would like to run them simultaneously on different JVM, in order ...
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2answers
1k views

Does Intel core i3 uses Dynamic CPU frequency switching?

I am using a VisualVM which is a Java Virtual Machine profiler. I am trying to start the application jvisualvm and it giving the message I am working on a Sony Vaio laptop model number VPCEA24FM ...
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1k views

What kind of JVM support is there for Modern UI apps?

Obviously, the JRE and Java applications and applets still work on the Desktop version of Windows 8. But is there a way to develop a Modern UI application in Java, or another JVM based language such ...
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3k views

Is it a neccessary to reboot computer after changes in system variables?

I change jdk path and JAVA_HOME in system variables from one to another and after that i open cmd and try: java -version and result of version not change to another jdk if my memory doesn't fail ...
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891 views

unable to set xmx beyond 4gb on system having 8gb RAM

I need to set ANT_OPTS=-Xms1024m -Xmx6144m -XX:PermSize=1024m -XX:MaxPermSize=1024m JAVA_OPTS=-Xms1024m -Xmx6144m -XX:PermSize=1024m -XX:MaxPermSize=1024m I have a system with 8gb(recently ...
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116 views

JVM implementation tests

I have been developing grails for some time now, and I keep running into platform dependent behavior. I have found bugs that only happen on legitimate versions of Windows and I have found bugs that ...
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1answer
534 views

change installed version of icedtea

I've installed openJDK6 64-bit server on my ubuntu image running in a VM. I installed it here in order to do some testing in comparison with our production environment. however, our production ...
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5answers
50k views

Do I have a Java Virtual Machine on my Windows 7?

How can I find out if there is Java Virtual Machine installed on my Windows 7?
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443 views

Is there a way to run multiple JVM within the same browser?

I'm using Oracle at work which fires off a Java app. I'd like to use two instances of the same app to work between two different screens of the same app. I can do it but with Chrome opening one and a ...
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660 views

Installing Eclipse

I need to install eclipse to use with PHP, so I downloaded it from eclipse.org, extracted the zip file, and tried to install eclipse. It was throwing an error like "JRE or JDK must be available in ...
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Find path to current JVM

I need to find the path to the current Java VM running on my Windows machine. How can I do that?
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1k views

How do I update my Java?

I've downloaded Java SE Runtime Environment 6u24 and Java SE Development Kit 6u24, but when I go to CMD and type java -version it still says: java version "1.4.2_03" Java(TM) 2 Runtime Environment, ...
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1answer
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Trying to install HP OfficeJet G85 All-in-One printer software on Windows XP

I have been running this printer successfully on a Windows 2000 partition. Because I wanted to use newer fonts available in XP, I decided to try to install the printer software and driver on the ...