For Garbage First Garbage Collector ( G1 GC ), any object that is more than half a region size is considered a Humongous Object .   A humo...

Caused by: java.lang.ClassCastException: [I cannot be cast to java.util.List. Initially, I was confused by seeing the sentence " I ca...

In [1], Marcus has written an excellent article on " Creating Flight Recording ." Based on his advice, we have created a JFR rec...

Before any JRockit performance tuning, you need to assess the sizes of the objects allocated by your application. [4] One way to access li...

Large objects can be a problem for an application. If your Java application allocates a lot of objects, especially large objects, it helps...

Many times we have confused ourselves with the following two Java Throwable messages: java.lang.ClassNotFoundException java.lang.NoClass...

Updated (09/19/2014): You can also add -XX:+UnlockInternalVMOptions to the command line to access JVM internal flags. ...

After system maintenance, our JRockit failed to create the Java virtual machine because it could not acquire the large pages as shown be...

Hotspot has two JITs named c1 (i.e., client JIT ) and c2 (i.e., server JIT ). [1] The client JIT starts fast but provides less optimizati...

When you report java.lang.OutOfMemoryError: Java heap space , you need to tell people which JVM has thrown the exception.  Sometimes this ca...

In this article, we will describe how to troubleshoot system crashes in WebLogic Server step by step: Enabling core dump if it's not ...