VisualVM

Spring ManagedAttribute appears in the Operations tab of the JMX console

由 百般思念 提交于 2019-12-10 22:55:13
问题 My MBeans are annotated using Spring annotations as follows: @ManagedAttribute(description = "returns the name") public String getName() { return name; } Now, whenever I open a JMX Console (be it VisualVM or JConsole), I can see the attributes of my beans in the Attributes tab, but I can also see the getName() method exposed in the Operations tab. Is there a way in which I can only see the attribute in the Attribute tab (i.e. hide it from the Operations tab)? 回答1:

jvisualvm: Stuck on “Loading Heap Dump…” screen

由 前提是你 提交于 2019-12-10 17:36:30
问题 I am using jdk64 and my java version is "1.6.0_24". My tomcat is running with -Xmx7196m, and jvisualvm is running with -J-Xms2048m -J-Xmx3072m. I took a heap dump of my tomcat java process and size of my .hprof file is around 5.5 GB. When I try to open this heap dump, it just stuck on Loading Heap Dump... screen. I also looked at the heap consumption of VisualVM while it is trying to open the heap dump, but that goes around 500MB only. NOTE: I did look at jvisualvm: Stuck on “Loading Heap

Cannot open some applications in VisualVM

由 你说的曾经没有我的故事 提交于 2019-12-10 16:58:43
问题 I am using Ubuntu 14.04 with Oracle JDK 8. I want to inspect performance of my application using VisualVM. I can inspect other applications like JDownloader but I can't inspect my own applications and Eclipse 4.3. Before I made fresh install of Ubuntu, I was using JDK 7 and I have no problem and using it without any configuration. It gives following log. SEVERE [org.openide.util.RequestProcessor]: Error in RequestProcessor com.sun.tools.visualvm.core.ui.DataSourceWindowManager$1 java.lang

深入理解Java虚拟机-Java内存区域透彻分析

由 左心房为你撑大大i 提交于 2019-12-10 15:43:05
Java虚拟机深入理解 系列全部文章更新中... 深入理解Java虚拟机-Java内存区域透彻分析 深入理解Java虚拟机-常用vm参数分析 深入理解Java虚拟机-JVM内存分配与回收策略原理，从此告别JVM内存分配文盲 深入理解Java虚拟机-如何利用JDK自带的命令行工具监控上百万的高并发的虚拟机性能 深入理解Java虚拟机-如何利用VisualVM对高并发项目进行性能分析 深入理解Java虚拟机-你了解GC算法原理吗 这篇文章主要介绍Java内存区域，也是作为Java虚拟机的一些最基本的知识，理解了这些知识之后，才能更好的进行Jvm调优或者更加深入的学习，本来这些知识是晦涩难懂的，所以希望能够讲解的透彻且形象。 0 运行时数据区域 JVM载执行Java程序的过程中会把它所管理的内存划分为若干个不同的数据区域。 Java 虚拟机所管理的内存一共分为Method Area（方法区）、VM Stack（虚拟机栈）、Native Method Stack（本地方法栈）、Heap（堆）、Program Counter Register（程序计数器）五个区域。 这些区域都有各自的用途，以及创建和销毁的时间，有的区域随着虚拟机进程的启动而存在，有些区域则是依赖用户线程的启动和结束而建立和销毁。具体如下图所示： 上图介绍的是JDK1.8 JVM运行时内存数据区域划分。1.8同1.7比

Profile Eclipse RCP with VisualVM

由 ＊爱你＆永不变心＊ 提交于 2019-12-10 13:32:03
问题 I am developing an application based on Eclipse RCP. I want to profile specific methods in my application: dropping an element and refreshing sections. I successfully connected VisualVM launch plugin to Eclipse. After my application ran I executed Profiler from VisualVM and dragged/refreshed some stuff in the application being profiled. At the end, I did not see corresponding methods in the call stack. I cannot find any methods which are responsible for my stuff and I can't do anything. Why

What the difference between Time and Time(CPU) in VisualVM

由 强颜欢笑 提交于 2019-12-10 12:44:28
问题 I was using VisualVM to find where all the time was being spent for a particular call. I found that most the time was in a database call, but the profier shows that 85% of the time was java.lang.Object and only 15% in the DB Call. Am I reading something wrong? The columns with data are Time, Time (CPU), Invocations. 回答1: It looks like most of the time is spend in Object.wait(). The difference between Time and Time(CPU) is described in the tooltip for particular column. Time(CPU) is an

heapdump size vs hprof size

由 纵饮孤独 提交于 2019-12-10 10:56:56
问题 I recently made a heapdump in a hprof format when my jboss server was running with a xms of 4096m and xmx of 4096m and a permsize of 512m. The hprof file generated is over 5gb. When I load the heapdump in visualvm, mat analyzer or yourkit, I only see a total bytes of approximately 1gb. I've tried changed the reachability scope in yourkit but it does not show more than 1 gb. Any idea what this big difference in filesize vs displayed heapdump size can cause? ps: I'm using jdk1.6.0_23

Running Visual VM from eclipse

由 故事扮演 提交于 2019-12-10 01:06:53
问题 I am trying to debug a java app using Visual VM in Eclipse kepler. I am executing the class having main method selecting Visual VM as launcher. I have configured Visual VM as per the instructions given in http://blog.idrsolutions.com/2013/05/setting-up-visualvm-in-under-5-minutes. I am getting the following error: An internal error occurred during: “Launching TestNew”. java.lang.NullPointerException “TestNew” is the name of the class with main method I am trying to execute. please help. 回答1:

visualvm fails with “No jdkhome found” on Ubuntu 15.10 with Oracle JDK

由 冷暖自知 提交于 2019-12-10 00:50:30
问题 I installed Oracle JDK from the webupd8team/java PPA, and then installed the visualvm package. When starting visualvm , I get the following error message: [beni:~]$ visualvm No jdkhome found My $JAVA_HOME is set correctly to /usr/lib/jvm/java-7-oracle . Also, when starting visualvm with the jdkhome property set, I get the same error: [beni:~]$ visualvm --jdkhome $JAVA_HOME No jdkhome found 回答1: visualvm checks the following three directories for a JDK: /usr/lib/jvm/java-7-openjdk-$ARCH /usr

VisualVM Not showing ANY methods called for CPU Performance Profiling

由 落爺英雄遲暮 提交于 2019-12-08 17:12:12
问题 I'm running a Java 1.6_21 SDK build app. Its been build in Eclipse, and i'm using the VistualVM eclipse plugin to launch VisualVM when the app starts. When I go to the Profile tab and click CPU profiling, It only shows the THREADS that are running, but it doesn't show any METHOD calls. Quite litterally, none. I've googled a whole bunch of things, but nothing seems to fit. has ANYONE seen this problem? Is there a solution?? Environment: Windows XP 32-bit "Classic" Eclipse SDK 3.7.0 VisualVM
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