permgen

Java - inline initialized string array memory allocation on heap?

由 六月ゝ 毕业季﹏ 提交于 2019-12-10 11:30:59
问题 String[] stringArray = new String[] { "abc", "xyz" }; Executing this line there are two String literals created "abc" and "xyz" in PERMGEN space. Since the initialization has a new operator I am not sure if there's any memory allocated on HEAP. Thanks guys. 回答1: All objects, except string literals, are created on the heap. From Java 7, string literals are created on the heap as well. In theory, escape analysis can prevent new object from being created on the heap and perhaps using the stack

Tomcat: OutOfMemoryError Permgen Space

由 元气小坏坏 提交于 2019-12-10 00:06:36
问题 I am developing a JSP application using Tomcat 6. Since I did add Quartz Scheduler Framework and Log4J library to project, Tomcat start throwing this exception when redeploying. I have readed about the problem causes, and now I know that have to be with the class loader. So, I guess the problem can be caused by the logger library that load some classes automatically. How can I deal with this problem? There is alternative way to setup the logger without using the log4j.properties file to

How much -XX:MaxPermSize size i can mention for 4GB and 8GB Ram and calculation for this?

由 纵然是瞬间 提交于 2019-12-08 05:13:13
问题 How much -XX:MaxPermSize size i can mention for 4GB and 8GB Ram. Here are the other detalis of my system OS:-window XP(32 bit) RAM:-4 GB java_opt- -Xms1536m -Xmx1536m //(mentioned as environment variable): tomcat version:-6.0.26 I have another system with 8GB ram with other details exactly same . Yes os is 64 bit Window 7. Along with this also let me know what can be the max value for -Xmx parameter for both the systems? It would be great if some body can tell me the calculation to arrive at

How can I view the MaxPermSize in JVM?

由 浪子不回头ぞ 提交于 2019-12-06 15:32:10
I'm meeting the dreadful PermGen:Out of memory error when deploying a web-app on TomCat. I have tried many possible solutions, but they don't work out(sometimes it works, usually it doesn't). I wonder if my config in "BuildConfig.groovy" take effect: grails.tomcat.jvmArgs = ["-Xmx1024m", "-XX:MaxPermSize=1024m"] Does anyone know someway to view the MaxPermSize actually applied by the JVM? You can use JVisualVM in the JDK/bin directory to monitor everything about a java process. Edward Torbett In direct answer to your question, java.lang.management.ManagementFactory has method to get

How to handle PermGen space exception in Tomcat?

由 不打扰是莪最后的温柔 提交于 2019-12-06 15:12:01
问题 I am getting a PermGen Space Exception whenever I deploy my web application. I tried some JVm option in NetBeans but still unable to resolve the issue. 回答1: Add this JVM parameter: -XX:MaxPermSize=128m (or 256m or 512m ). Here's a related article as well that lists some other useful JVM options. 来源： https://stackoverflow.com/questions/1371683/how-to-handle-permgen-space-exception-in-tomcat

Java - inline initialized string array memory allocation on heap?

由 此生再无相见时 提交于 2019-12-06 13:19:08
String[] stringArray = new String[] { "abc", "xyz" }; Executing this line there are two String literals created "abc" and "xyz" in PERMGEN space. Since the initialization has a new operator I am not sure if there's any memory allocated on HEAP. Thanks guys. All objects, except string literals, are created on the heap. From Java 7, string literals are created on the heap as well. In theory, escape analysis can prevent new object from being created on the heap and perhaps using the stack instead. This rarely happens in practice AFAIK. In answer to EJP question, I haven't fund a non trivial

Tomcat memory usage (PermGen)

由 谁说胖子不能爱 提交于 2019-12-06 07:01:38
问题 I am using Tomcat for deploying a web application withe following PermGen configurations: JAVA_OPTS="-Djava.awt.headless=true -Dfile.encoding=UTF-8 -server -Xms1536m -Xmx1536m -XX:NewSize=256m -XX:MaxNewSize=256m -XX:PermSize=256m -XX:MaxPermSize=256m -XX:+DisableExplicitGC" Please I want to know the following: Is the whole memory used by Tomcat should be 256MB or Tomcat consumes other memory for other reasons ? How can I monitor the memory used by Tomcat to avoid reaching PemGen max size ?

JVM调优之Tomcat启动参数配置及详解（一）

由 扶醉桌前 提交于 2019-12-06 06:49:14
开发项目中会遇到Tomcat内存溢出( java.lang.OutOfMemoryError: PermGen space )的问题，通过查找资料找到是通过设置Tomcat 启动堆空间大小、年轻代大小、每个线程大小参数进行调优的，具体如下： 一、在Tomcat 启动脚本（catalina.sh/catalina.bat）首行添加如下配置即可解决此问题 JAVA_OPTS="-Xms2048m -Xmx2048m -Xmn1024m -Xss1024K -XX:PermSize=128m -XX:MaxPermSize=512m" 1：-Xms 堆空间初始大小 2：-Xmx 堆空间最大数值 3：-Xmn 年轻代的堆大小 4：-Xss 每个线程堆大小 二、JVM堆大小的默认最大和最小值（参考） 操作系统及JVM类型 初始堆的大小（Xms） 最大堆的大小（Xmx） Linux/Solaris，32位客户端 16MB 256MB Linux/Solaris，32位服务器 64MB 取1GB和物理内存大小1/4二者中的最小值 Linux/Solaris，64位服务器 取512MB和物理内存大小1/64二者中的最小值 取32GB和物理内存大小1/4二者中的最小值 MacOS，64位服务器型JVM 64MB 取1GB和物理内存大小1/4二者中的最小值 32位Window系统，客户端型JVM

java.lang.OutOfMemoryError: PermGen space error with Jetty

由 烂漫一生 提交于 2019-12-06 02:09:41
问题 I am currently getting an java.lang.OutOfMemoryError: PermGen space . I am using Jetty and Linux Ubuntu. I have tried reading and attempting the different solutions that were provided in previous similar questions but I am not having any success. One similar question was Dealing with “java.lang.OutOfMemoryError: PermGen space” error But these solutions seem to be using Tomcat instead of Jetty. I keep getting the out of memeory error if I redeploy my service a few times. For example to test

Why does allocated size of permanent generation increase after executing perform GC?

由 别等时光非礼了梦想. 提交于 2019-12-05 05:53:55
Following are the snapshots I took after executing perform GC from jvisualvm. and First image is Heap stats and 2nd one is perm gen stats. I am not able to understand when I did GC utilized heap size decreased(as expected) but the allocated size of permanent generation increased (though the utilized permgen size remained the same). What could be the possible explanation of such behavior? JVM arguments used -Xbootclasspath/p:../xyz.jar -Xbootclasspath/a:../abc.jar -Djava.endorsed.dirs=../resolver -Djava.library.path=../framework -Djavax.management.builder.initial=JBeanServerBuilder -Djavax.net
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