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Best JMX Monitoring Tools for - Open-source & Paid Tools! - Introduction
See Using JConsole for more information on jconsole's functionality and the jconsole command-line tool documentation for jconsole's command-line options. To contribute to JConsole, make sure you read the page explaining how to contribute to the OpenJDK project, and follow the rules and guidelines described there. You will find out that there can be many ways to contribute: one of them is to contribute to the quality. JConsole doesn't contain native code.
This tool is compliant with JMX. The tool uses the built-in JMX instrumentation in the JVM to provide information about the performance and resource consumption of running applications.
The JConsole tool is built on the java. JConsole connects to applications that run on the same workstation or on a remote workstation. The applications must be configured to allow access. The garbage collector is a type of memory manager responsible for reclaiming memory used by unreachable objects. A Java VM may have one or more memory managers. It may add or remove memory managers during execution.
A memory pool can be managed by more than one memory manager. Garbage collection GC is how the Java VM frees memory occupied by objects that are no longer referenced. It is common to think of objects that have active references as being "alive" and non-referenced or unreachable objects as "dead.
The algorithms and parameters used by GC can have dramatic effects on performance. Generational GC takes advantage of the observation that most programs conform to the following generalizations.
Generational GC divides memory into several generations, and assigns one or more memory pools to each. When a generation uses up its allotted memory, the VM performs a partial GC also called a minor collection on that memory pool to reclaim memory used by dead objects. This partial GC is usually much faster than a full GC.
The Java HotSpot VM defines two generations: the young generation sometimes called the "nursery" and the old generation. The young generation consists of an "Eden space" and two "survivor spaces. When it performs a minor GC, the VM moves any remaining objects from the Eden space to one of the survivor spaces.
The VM moves objects that live long enough in the survivor spaces to the "tenured" space in the old generation. When the tenured generation fills up, there is a full GC that is often much slower because it involves all live objects.
The permanent generation holds all the reflective data of the virtual machine itself, such as class and method objects. The default arrangement of generations looks something like Figure If the garbage collector has become a bottleneck, you can improve performance by customizing the generation sizes. Using JConsole, you can investigate the sensitivity of your performance metric by experimenting with the garbage collector parameters. For more information, see Tuning Garbage Collection with the 5.
The Threads list in the lower left corner lists all the active threads. If you enter a string in the Filter field, the Threads list will show only those threads whose name contains the string you enter. Click on the name of a thread in the Threads list to display information about that thread to the right, including the thread name, state, and stack trace.
The Threading MXBean provides several other useful operations that are not covered by the Threads tab. This operation returns an array of deadlocked thread IDs. This includes the name, stack trace, and the monitor lock that the thread is currently blocked on, if any, and which thread is holding that lock, as well as thread contention statistics.
This MXBean lists all the attributes and operations for accessing threading information in the Java VM being monitored.
See Monitoring and Managing MBeans. To check if your application has run into a deadlock for example, your application seems to be hanging , deadlocked threads can be detected by clicking on the "Detect Deadlock" button. If any deadlocked threads are detected, these are displayed in a new tab that appears next to the "Threads" tab, as shown in Figure The Detect Deadlock button will detect deadlock cycles involving object monitors and java.
Monitoring support for java. JConsole will not show any deadlocks related to ownable synchronizers. See the API documentation for java.
Thread for more information about threads and daemon threads. The Details section at the bottom of the tab displays the total number of classes loaded since the Java VM started, the number currently loaded and the number unloaded. You can set the tracing of class loading to verbose output by checking the checkbox in the top right-hand corner. The Hotspot VM uses adaptive compilation, in which the VM launches an application using a standard interpreter, but then analyzes the code as it runs to detect performance bottlenecks, or "hot spots".
Total threads started : Total number of threads started since Java VM started, including daemon, non-daemon, and terminated threads.
Total classes loaded : Total number of classes loaded into memory since the Java VM started, including those that have subsequently been unloaded. Total classes unloaded : Number of classes unloaded from memory since the Java VM started. Garbage collector : Information about garbage collection, including the garbage collector names, number of collections performed, and total time spent performing GC.
Committed virtual memory : Amount of virtual memory guaranteed to be available to the running process. VM arguments : The input arguments the application passed to the Java VM, not including the arguments to the main method.
Class path : The class path that is used by the system class loader to search for class files. Boot class path : The boot class path is used by the bootstrap class loader to search for class files. The MBeans tab allows you to access the full set of the platform MXBean instrumentation, including that which is not visible in the other tabs. In addition, you can monitor and manage your application's MBeans using the MBeans tab.
The tree on the left shows all the MBeans currently running. When you select an MBean in the tree, its MBeanInfo and its MBean Descriptor are both displayed on the right, and any attributes, operations or notifications appear in the tree below it. By default, the MBeans are displayed in the tree based on their object names.
The order of key properties specified when the object names are created is preserved by JConsole when it adds MBeans to the MBean tree. The exact key property list that JConsole will use to build the MBean tree will be the one returned by the method ObjectName.
However, relying on the default order of the ObjectName key properties can sometimes lead to unexpected behavior when JConsole renders the MBean tree. For example, if two object names have similar keys but their key order differs, then the corresponding MBeans will not be created under the same node in the MBean tree. As far as the JMX technology is concerned, these objects will be treated in exactly the same way. The order of the keys in the object name makes no difference to the JMX technology.
To avoid this problem, you can specify the order in which the MBeans are displayed in the tree by supplying an ordered key property list when you start JConsole at the command line. This is achieved by setting the system property com.
The key property list system property takes a comma-separated list of keys, in the order of your choosing, where key must be a string representing an object name key or an empty string. If a key specified in the list does not apply to a particular MBean, then that key will be discarded. If an MBean has more keys than the ones specified in the key property list, then the key order defined by the value returned by ObjectName.
Publisher Description. Version History Here you can find the changelog of hibernate-jconsole since it was posted on our website on The latest version is 1. See below the changes in each version:. Download hibernate-jconsole. Runtime statistics are collected for the dynamically detected flows during snapshot interval. The instrumented methods may be set
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