I have two containers ran by Docker Swarm: Host OS is Debian Jessie. There are JVM applications in both containers. Why does docker stats show zero memory usage? Should I configure my Java apps somehow to be able to see memory usage in docker stats? Is there some other way to check memory usage? Answer It is quite possible that
Tag: jvm
java.lang.InternalError: a fault occurred in a recent unsafe memory access operation in compiled Java code
I was wondering if some of the JVM gurus out there can briefly explain the following error. What does it actually mean in technical terms and what are the sequences of events that can lead to this error? Answer This error means that sun.misc.Unsafe.getX() or putX() memory access resulted in SIGBUS error, which was then caught by JVM and translated
What is the `it` in Kotlin lambda body?
For example in these two following codes: and In this code what does it mean? Answer it variable is an implicit parameter in lambda. One other helpful convention is that if a function literal has only one parameter, its declaration may be omitted (along with the ->), and its name will be it:
Failed to create JVM; JVM path C:Program FilesAndroidAndroid Studiojrejre
When I start Android Studio I am facing this error. It was working properly until today. But Today I searched for speeding up Android Studio and applying 2nd option of this solution and after that android studio starts throwing this error. I searched a lot but couldn’t find the proper solution. I also check JAVA_HOME path and my JDK is
Understanding safe access of JNI arguments
I’m doing some research regarding how HotSpot performs garbage-collection and/or heap-compaction while JNI code is running. It appears to be common knowledge that objects could be moved at any time in Java. I’m trying to understand, definitively if JNI is subject to effects garbage-collection. There exist a number of JNI functions to explicitly prevent garbage-collection; such as GetPrimitiveArrayCritical. It makes
Java Invalid maximum heap size
I just installed Ubuntu 64Bit on my VServer and JRE build 1.7.0_67-b01. If I want to run a java jar-file it says Invalid maximum heap size: -Xmx Error: Could not create the Java Virtual Machine. Error: A fatal exception has occurred. Program will exit. java -help says java version “1.7.0_67” Java(TM) SE Runtime Environment (build 1.7.0_67-b01) Java HotSpot(TM) 64-Bit Server
What JVM optimization is causing these performance results? [closed]
Closed. This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 8 years ago. Improve this question In a Java REST service performance test, I got an unexpected pattern: a method that creates and returns always the same value object in each
How do I set JVM options for GradleWorkerMain?
When I set GRADLE_OPTS or JAVA_OPTS, these are set for GradleWrapperMain when I run ./gradlew build for my project. But I need them to be set for GradleWorkerMain as well. How do I do that? Here’s the ps listing when that Gradle job is running in Bamboo. My JAVA_OPTS (such as -Dcool.opt=1) is missing from GradleWorkerMain. Answer There is no
Doesn’t the JVM release all the resources that are not explicitly closed by the programmer on program exit
I’ve always heard that resources in java must be closed after use or these resources will get exhausted. Is it really a matter of concern for small programs that use very few resources(like 1 or 2 file readers/ buffered readers and all)? Doesn’t the JVM keep track of the resources being used by a program? And wouldn’t it release all
JVM error when try to allocate more than 128M Xms, without specifying Xmx
I am seeing an JVM issue when I am running my application and I simply to below java commands: Even Xms is set to 128M does not work: Works only when Xms is set to 64M or less: The interesting thing is if I specify Xmx, then it works well. More interesting thing is: All above commands run well on