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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19 views

Linking JVM languages other than Java with Matlab

I'm aware that it's possible to link Java programs with Matlab. Is it therefore possible to link any JVM languages with Matlab? I would suspect that's the case -- presumably Matlab can't tell and ...
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23 views

Neo4j 3.5.5 server goes down

Neo4j 3.5.5 server goes down when we find a lot of repeatable messages in debug.log WARN [o.n.k.i.a.t.m.KernelTransactionMonitor] Transaction KernelTransactionImplementationHandle{txReuseCount=48, tx=...
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51 views

How does IHOP calculated in G1 GC for starting concurrent marking cycle?

I'm trying to understand how G1 GC calculates the marking threshold and how it uses the values of -XX:InitiatingHeapOccupancyPercent and -XX:+G1UseAdaptiveIHOP determine the marking threshold and with ...
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14 views

Tanuki wrapper multiple unwanted instances

Using Tanuki 3.5.25 software to manage a java8 service we encounter a problem on AIX that can be observed in the following logs: STATUS | wrapper | 2019/09/08 15:07:09 | --> Wrapper Started as ...
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Talend JVM compatibility

Hi everyone I'm executing a job on Talend 6.3.1 on the commandline using this command : executeJob job_name -i /etc/alternatives/jre_1.8.0_openjdk/bin/java -jc DEV and I always get the following ...
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1answer
40 views

JVM Failed to start while installing java

I installed java, and then realized that it was the wrong version, so I tried reinstall Java, but mid installation it said "JVM Failed to start". I tried to install JDK 1.8.0_221. Any help would be ...
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0answers
209 views

Unable to locate plugin type for IfFileName

When i try to install sonarqube on windows 10, elasticsearch give me this error: wrapper | --> Wrapper Started as Console wrapper | Launching a JVM... jvm 1 | Wrapper (Version 3.2.3) http://...
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130 views

Raspberry Pi 4. Could not reserve enough space for object heap. Java isn't using virtual memory

Error occurred during initialization of VM Could not reserve enough space for 4096000KB object heap
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1answer
123 views

Tomcat crashed with unexpected error

Tomcat server crashed with the unexpected error detected by the java virtual machine. And hs_err_pid.log file was also generated during the crash. hs_err_pid log file captured 'V [libjvm.so+...
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I got a SIGILL and JVM crashed when I booted a java application with --agentpath:libxxx.so on AIX 7.1

My dynamic shared library complied with CPPFlAGS: -q64 -G. The compiler version is IBM XL C/C++ for AIX, V11.1 (5724-X13) Version: 11.01.0000.0024 when it was started, then crashed, here is part of ...
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54 views

Can a JVM PID change?

Say I'm running a simple Java application on a linux server and I want to get information about the JVM system properties rather frequently. For this purpose, I was thinking of making an API I could ...
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34 views

getting DCEVM work with Websphere V8.5

Do you know how to get hot-swap agent to work with Web-sphere 8.5. I updated the server virtual machine arguments to point to the DCEVM and hot-swap agent as shown below but I am getting an error ...
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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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1answer
418 views

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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1answer
144 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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1answer
52 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
2k 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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3answers
6k views

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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0answers
546 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
1k 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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181 views

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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2answers
59 views

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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2answers
1k 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
6k 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 ...
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1answer
89 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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1answer
56 views

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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1answer
165 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
895 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
178 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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302 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
847 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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2answers
109 views

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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0answers
771 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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1answer
370 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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0answers
648 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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0answers
137 views

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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1answer
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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5answers
5k views

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 ...
2
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0answers
72 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
108k 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
206 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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0answers
176 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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1answer
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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1answer
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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0answers
1k 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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1answer
126 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
543 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
52k 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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0answers
457 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 ...