how does jndi work java?
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The Java Naming and Directory Interface (JNDI) is a Java API for a directory service that allows Java software clients to discover and look up data and resources (in the form of Java objects) via a name. Like all Java APIs that interface with host systems, JNDI is independent of the underlying implementation.
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JDK includes the JRE plus command-line development tools such as compilers and debuggers that are necessary or useful for developing applets and applications. JRE is basically the Java Virtual Machine where your Java programs run on.
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The Java class created from each JSP implements Servlet . Then, the Java code goes through the same cycle it normally does. Still at run time, it is compiled into bytecode and then into machine code. Finally, the JSP-turned-Servlet responds to requests like any other Servlet.
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JVM runs the bytecode, Java compiler generates it. However, applications can generate the bytecode while they run, but the generated bytecode is again executed by the JVM. JVM, depending on platform , convert the byte code to m/c code. More precisely, JIT (just-in-time) compiler inside JVM does this.
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Steps to generate HeapDump a) For Windows: You can open the Task Manager and check for the process id (PID) of Jvm or use the jps command from java/bin path in command prompt. 2. We have to use the JMAP tool to generate the heap dump which is part of the jdk. a) Windows: It is present inside the jdk - bin folder.
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Both java.exe and javaw.exe can execute java programs including jar file, the only difference is that with java.exe you have a console executed and you need to wait until your java program finishes to run any other command on the other hand in case of javaw.exe no console or window is associated with execution.
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['Open Internet Explorer icon and go to Java.com.', 'Select the Free Java Download button, and then select Agree and Start Free Download. ... ', 'On the notification bar, select Run. ... ', 'Select Install > Close.', "If you're having problems installing or using Java, look for answers in the Java Help Center."]
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If you want to use Java for free for commercial use, one way of doing it is to use an Oracle JDK, Oracle's OpenJDK builds and OpenJDK from other providers. This, of course, does not include support from Oracle, however.
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oracle.jdbc.xa.client An object that implements the XADataSource interface is typically registered with a JNDI service provider. For optimization purposes, we implemented 2 versions of OracleXADataSource: one for client, and one for server when used in Java Stored Procedures and in EJB.
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['The Java Virtual Machine.', 'The Java Application Programming Interface (API)']
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['Start a MS-DOS command window. ... ', 'Now, change to the directory of your choice from within the command window. ... ', 'Create some Java source code with Notepad from within the command window. ... ', 'The source code, Test.java, might look like this: ... ', 'Double check the name of the Java program file you just saved.']
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jvm call public static void main() method to start application. as well as static block also executed after classes loaded. without main() the program gives main method not found exception but you can avoid this error by adding System.
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Jakarta Server Pages (JSP; formerly JavaServer Pages) is a collection of technologies that helps software developers create dynamically generated web pages based on HTML, XML, SOAP, or other document types. Released in 1999 by Sun Microsystems, JSP is similar to PHP and ASP, but uses the Java programming language.
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JDK is a superset of JRE, and contains everything that is in JRE, plus tools such as the compilers and debuggers necessary for developing applets and applications. JRE provides the libraries, the Java Virtual Machine (JVM), and other components to run applets and applications written in the Java programming language.
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A JDBC driver is a software component enabling a Java application to interact with a database. JDBC drivers are analogous to ODBC drivers, ADO.NET data providers, and OLE DB providers. To connect with individual databases, JDBC (the Java Database Connectivity API) requires drivers for each database.
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The JSP engine compiles the servlet into an executable class and forwards the original request to a servlet engine. A part of the web server called the servlet engine loads the Servlet class and executes it. During execution, the servlet produces an output in HTML format.
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Java is a compiled programming language, but rather than compile straight to executable machine code, it compiles to an intermediate binary form called JVM byte code. The byte code is then compiled and/or interpreted to run the program.