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I would like to know <br />
<br />
Different Cascading mechanims like Persist, remove, detach, merge, refresh, all in JPA.<br />
<br />
When do we use them. Advantages, disadvantages, comparisons of them. How they are related. practical implementations of them.<br />
I was not clear on this concept.<br />
&nbsp;Thanks in advance
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I would like to know 

Different Cascading mechanims like Persist, remove, detach, merge, refresh, all in JPA.

When do we use them. Advantages, disadvantages, comparisons of them. How they are related. practical implementations of them.
I was not clear on this concept.
 Thanks in advance

Cascading mechanims in JPA

Java Enterprise Edition (Java EE) is a specification defining a collection of Java-based server and client technologies and how they interoperate. Java EE specifies server and client architectures and uses profiles to define technology sets targeted at specific classes of applications. All Java EE profiles share a set of common features, such as naming and resource injection, packaging rules and security requirements.

Java EE

Java is a platform-independent, object-oriented programming language and run-time environment, designed to have as few implementation dependencies as possible such that developers can write one set of code across all platforms using libraries. Most devices will not run Java natively, and require a run-time component to be installed in order to execute a Java program.

Java

JavaServer Pages (JSP) allow the development of dynamically generated web pages. It uses the Java programming language; JSP pages are translated into servlets at runtime, with each servlet being cached and reused until the JSP is modified. JSP allows Java code to be interleaved with static web markup content, so the resulting page can be compiled and executed on the server to deliver the content.