JMX

Java Management Extensions (JMX) is a Java technology that provides tools for monitoring and managing devices, system objects and service oriented networks. Those resources are represented by objects known as  MBeans  or  Managed Bean. The classes can be dynamically loaded and represented in the API. These applications can be implemented and developed using Java Dynamic Management Kit.

JMX is based on a 3-level architecture, described below:

The Probe level holds the probes known as Mbeans, at Instrumentation level managing the resources are known as Instrumentation level.

The MbeanServer is the core of JMX. It is an intermediator between the MBean and the applications.

The Remote Management level allows remote applications to access the MBeanServer via Adaptors and Connectors. A connector allows complete remote access to the MBeanServer API via various communication frameworks such as IIOP, RMI, JMS, whereas an adaptoradjusts the API to another protocol or to Web-based GUI.

Jconsole
JConsole is a graphical tool to monitor Java Virtual Machine  and java applications on a local as well as on  remote machine. It utilizes fundamental characteristics of Java Virtual Machine to render information on resource and performance consumption of applications running on the Java platform utilizing Java Management Extensions  technology. JConsole is a part of Java Development Kit (JDK) and the graphical console can be started using "jconsole" command.

Dtrace Performance
DTrace is a dynamic tracing framework developed by Sun Microsystems for troubleshooting kernel and application queries on production systems in real time. 

It can be used to get a worldwide summary of a running system, such as CPU time , amount of memory, network resources utilized by the active processes. It can also renders much more information, for example a log of the arguments with which a particular function is being called or a list of the processes getting at a specific file.

DTrace is designed to give functional overview that allow users to tune up and troubleshoot applications and the OS by itself.

Tracing programs are written using the D programming language,  a subset of C with added functions and variables specific to tracing.  D programs correspond awk programs in structure. They consist  a list of one or more probes known as instrumentation points  and each probe is linked up with an action. These probes are corresponding to a pointcut in aspect-oriented programming.

Special considerations have been taken to make DTrace safe to use in a production environment. For example, there is minimum probe effect when tracing is in progress and no performance impact is associated with any disabled probe. This is significant since there are hundreds of DTrace probes that can be altered. New probes can also be generated dynamically.

Security
Spring Security is a Java EE framework which provides authorization,  other security features and authentication for enterprise applications. The project was began in late 2003 as 'Acegi Security' by Ben Alex, which was publically released under the Apache License in March 2004. Later on, Acegi was unified into the Spring portfolio as Spring Security, which is an official Spring sub-project.

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