Java Out Of Memory Error Weblogic
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Contents Previous Next 3.2 Understand the OutOfMemoryError Exception One common indication of a memory leak is the java.lang.OutOfMemoryError exception. Usually, this error is thrown when there java.lang.outofmemoryerror: gc overhead limit exceeded weblogic is insufficient space to allocate an object in the Java heap.
Weblogic Out Of Memory Error Permgen Space
In this case, The garbage collector cannot make space available to accommodate a new object, and the heap weblogic server out of memory error cannot be expanded further. Also, this error may be thrown when there is insufficient native memory to support the loading of a Java class. In a rare instance, a how to resolve out of memory error in weblogic java.lang.OutOfMemoryError may be thrown when an excessive amount of time is being spent doing garbage collection and little memory is being freed. When a java.lang.OutOfMemoryError exception is thrown, a stack trace is also printed. The java.lang.OutOfMemoryError exception can also be thrown by native library code when a native allocation cannot be satisfied (for example, if swap space is
How To Increase Heap Size In Java
low). An early step to diagnose an OutOfMemoryError exception is to determine the cause of the exception. Was it thrown because the Java heap is full, or because the native heap is full? To help you find the cause, the text of the exception includes a detail message at the end, as shown in the following exceptions. Exception in thread thread_name: java.lang.OutOfMemoryError: Java heap space Cause: The detail message Java heap space indicates object could not be allocated in the Java heap. This error does not necessarily imply a memory leak. The problem can be as simple as a configuration issue, where the specified heap size (or the default size, if it is not specified) is insufficient for the application. In other cases, and in particular for a long-lived application, the message might be an indication that the application is unintentionally holding references to objects, and this prevents the objects from being garbage collected. This is the Java language equivalent of a memory leak. Note: The APIs that are called by
By Luz Mestre-Oracle on Nov 11, 2014 OutOfMemoryError (OOM) is a common issue that we can see in any WebLogic Server environment.Here are some guidelines you can follow to troubleshoot the issue:1. java.lang.outofmemoryerror java heap space eclipse Have you tried increasing the heap size? This is the first thing you weblogic 12c memory leak need to try to tune your environment, the issue will probably be fixed. Here is a nice Document that explains memory
Java.lang.outofmemoryerror Permgen Space Weblogic 11g
management for hotspot JDK (it mostly apply to recent versions): http://www.oracle.com/technetwork/java/javase/memorymanagement-whitepaper-150215.pdf 2. Have you tried the latest JDK of your version? Even you are using a certified JDK, older versions have several bugs https://docs.oracle.com/javase/8/docs/technotes/guides/troubleshoot/memleaks002.html that have been found along the years. These bugs can be related to GC algorithms, so trying to tune your JVM in an old version, you might not get the expected result. Also, the latest releases include several security fixes you might wnat to have in your environment. You can find all Oracle Java releases (including JRockit) here: All Java SE Downloads on MOS (Doc ID 1439822.1)3. Are you using https://blogs.oracle.com/LuzMestre/entry/how_can_i_fix_java 32 or 64 bit JVM ? If your environment is certified with 64 bit JVM, always consider using 64 bit JVM for scalability.4. What JVM and Operating System are you using? Depending on if you are using Hotspot/JRockit/ other JDK and also depending on your OS you can define the way you collect, gclogs, heapdumps, histograms. FAQ: JRockit and java.lang.OutOfMemoryError related issues (Doc ID 1290251.1) How to Troubleshoot Java Heap Memory Leak - "java.lang.OutOfMemoryError: Java heap space" (Doc ID 1236373.1) How to collect a heap dump? - https://blogs.oracle.com/LuzMestre/entry/how_to_collect_a_heap5. I getting stuck threads and OutOfMemoryError, What to troubleshoot first? You need to troubleshoot the OOM first. Frequent GC can cause huge GC pauses, then stuck threads can occur. Resources for Garbage Collection Performance Tuning (Doc ID 1572109.1)6. I am getting a JVM crash and OutOfMemoryError, What to troubleshoot first? You need to troubleshoot the OOM. After an OOM, the JVM is unstable, so a JVM crash can occur. Oracle WebLogic Server Support Pattern: Troubleshooting Out of Memory and Memory Leak Problems (Doc ID 877172.1) Enjoy! Category: Oracle Tags: crash hang java.lang.outofmemoryerror oom outofmemoryerror stucj threads Permanent link to this entry « Error Correction... | Main | Why does my Weblogic... » Comments:
HomeTroubleshootingDifferent Out Of Memory Issues Different Out Of Memory Issues Divya December 30, 2010 Troubleshooting 14 Comments Tweet Pin It * Exception in thread "CompilerThread1" java.lang.OutOfMemoryError: requested 793020 bytes for Chunk::new. Out of http://weblogic-wonders.com/weblogic/2010/12/30/different-out-of-memory-issues/ swap space? Out of memory while reading in symbol table of /apps/bea/weblogic92/jdk1.5.0.18/opt/java1.5/jre/lib/PA_RISC2.0/server/libjvm.sl ( 0) 0xc8461230 [/apps/bea/weblogic92/jdk1.5.0.18/opt/java1.5/jre/lib/PA_RISC2.0/server/libjvm.sl] ( 1) 0xc80a5fec [/apps/bea/weblogic92/jdk1.5.0.18/opt/java1.5/jre/lib/PA_RISC2.0/server/libjvm.sl] ( 2) 0xc7f00420 [/apps/bea/weblogic92/jdk1.5.0.18/opt/java1.5/jre/lib/PA_RISC2.0/server/libjvm.sl] ( 3) 0xc7f00ca0 [/apps/bea/weblogic92/jdk1.5.0.18/opt/java1.5/jre/lib/PA_RISC2.0/server/libjvm.sl] ( http://jesuscasquero.blogspot.com/2012/08/dealing-with-out-of-memory-and-memory.html 4) 0xc8368d08 [/apps/bea/weblogic92/jdk1.5.0.18/opt/java1.5/jre/lib/PA_RISC2.0/server/libjvm.sl] ( 5) 0xc005b2e4 __pthread_body + 0x44 [/usr/lib/libpthread.1] ( 6) 0xc0065574 __pthread_start + 0x14 [/usr/lib/libpthread.1] Java out of memory messages are marked with pid: 13828 in /var/adm/syslog/syslog.log. Possible out of causes: - not enough swap space left, or - kernel parameter MAXDSIZ is very small. Solution: Although it appears that an OutOfMemoryError is thrown this apparent exception is reported by the HotSpot VM code when an allocation from the native heap failed and the native heap may be close to exhaustion. The message indicates the size (in bytes) of out of memory the request that failed and also indicates what the memory is required for. In some cases the reason will be shown but in most cases the reason will be the name of a source module reporting the allocation failure. If an OutOfMemoryError with this error is thrown it may require using utilities on the operating system to diagnose the issue further. Examples of issues that may not be related to the application are when the operating system is configured with insufficient swap space, or when there is another process on the system that is consuming all memory resources. If neither of these issues is the cause then it is possible that the application is failed due to native leak; for example, application or library code is continuously allocating memory but is not releasing it to the operating system. For more information: http://java.sun.com/j2se/1.5/pdf/jdk50_ts_guide.pdf The recommendation for swap space size in the Solaris is that swap should be configured about 30% of physical RAM. The following link has suggested a workaround to add ‘-XX:+UseDefaultStackSize -Xss256K' parameter. http://bugs.sun.com/bugdatabase/view_
They are two different concepts, with diferents causes but with the same result: partial or total loss of service. Memory Leak error A memory leak occurs if memory is used by an application and not released by the application when it is finished with it. A memory leak can occur in either java heap or native memory, and either will eventually cause an out of memory situation. This is the worst case that can happen, because the memory is not released correctly and increase the JVM heap only will delay the problem. In this case the development team must come into play and study in what part of the application memory is being lost. Out of Memory Error (OOM) An Out of Memory error occurs due to memory exhaustion, either in java heap or native memory. In the JVM, OOM errors are thrown when the JVM cannot allocate an object because it is out of heap memory, and no more heap memory could be made available by the garbage collector.This can occur due to incorrect configuration of the JVM tuning parameters, not necessarily because of a problem in the application, almost certainly occur as in the previous point. Some brief notes on the types of memory Java heap memory This is the memory that the JVM uses to allocate java objects. The JVM throws java out of memory (java OOM) error if it is not able get more memory in java heap to allocate more java objects. The JVM cannot allocate more java objects if the java heap is full of live objects and it is not able to expand the java heap anymore. This situation can lead to the application server to shut down. Native memory This is the memory that the JVM uses for its own internal operations. The JVM throws native out of memory (native OOM) if it is not able to get any more native memory. This usually happens when the process reaches the process size limitation on that OS or the machine runs out of RAM and swap space. This situation can lead to the JVM to abort and generate a core. JVM flavours: HotSpot vs JRockit You have available two JVMs for Oracle WebLogic Server: HotSpot, from Sun, recently acquired by Oracle. JRockit, from BEA, recently acquired by Oracle. Lots to talk about this, each has its characteristics and depending on the environment, architecture and operating conditions one is more suitable than the other. As you can imagine, a company is not going to keep i