Write a servlet bean program to access information from databases

When I start my app and enter a wrong password in the proxy login dialog poped up by Web Start my app starts.

The "2" was originally intended to emphasize the major changes introduced in version 1.

The naming convention has been changed several times over the Java version history. Starting with J2SE 1. Java Platform, Enterprise Edition Java EE is a related specification that includes all the classes in Java SE, plus a number that are more useful to programs that run on servers as opposed to workstations.

Java Platform, Micro Edition Java ME is a related specification intended to provide a certified collection of Java APIs for the development of software for small, resource-constrained devices such as cell phonesPDAs and set-top boxes. General purpose packages[ edit ] java. This includes the root classes that form the class hierarchytypes tied to the language definition, basic exceptionsmath functions, threadingsecurity functions, as well as some information on the underlying native system.

This package contains 22 of 32 Error classes provided in JDK 6. The main classes and interfaces in java. Object — the class that is the root of every class hierarchy.

Enum — the base class for enumeration classes as of J2SE 5. Class — the class that is the root of the Java reflection system. Throwable — the class that is the base class of the exception class hierarchy. ErrorExceptionand RuntimeException — the base classes for each exception type.

The real story on container, cloud, and data adoption. Poll results reveal where and why organizations choose to use containers, cloud platforms, and data pipelines. This FAQ complements Sun's official Java Web Start FAQ page and aims to provide you with information that is not included on the official page for whatever reason. In order to write and compile a Java programs, applets or servlets one must download the Java Development Kit (JDK) which provides a compiler, class libraries and tools to compile and run Java code.

Thread — the class that allows operations on threads. String — the class for strings and string literals. Comparable — the interface that allows generic comparison and ordering of objects as of J2SE 1. Iterable — the interface that allows generic iteration using the enhanced for loop as of J2SE 5.

ClassLoaderProcessRuntimeSecurityManagerand System — classes that provide "system operations" that manage the dynamic loading of classes, creation of external processeshost environment inquiries such as the time of day, and enforcement of security policies.

The basic exception classes thrown for language-level and other common exceptions. It is an important package, central enough to the language for the language designers to give it a name that starts with "java.

This package was added in J2SE 1. Java has an expressive system of references and allows for special behavior for garbage collection. A normal reference in Java is known as a "strong reference. Each type of reference is designed for a specific use. A SoftReference can be used to implement a cache.

An object that is not reachable by a strong reference that is, not strongly reachablebut is referenced by a soft reference is called "softly reachable. This generally means that softly reachable objects are only garbage collected when free memory is low—but again, this is at the garbage collector's discretion.

Semantically, a soft reference means, "Keep this object when nothing else references it, unless the memory is needed. An object that is not strongly or softly reachable, but is referenced by a weak reference is called " weakly reachable ". A weakly reachable object is garbage collected in the next collection cycle.

This behavior is used in the class java. Another possible application of weak references is the string intern pool.

Semantically, a weak reference means "get rid of this object when nothing else references it at the next garbage collection. An object that is not strongly, softly or weakly reachable, but is referenced by a phantom reference is called "phantom reachable. Semantically, a phantom reference means "this object is no longer needed and has been finalized in preparation for being collected.

When a Reference is created it is optionally registered with a reference queue.Tutorial Starting and Using the H2 Console Special H2 Console Syntax Settings of the H2 Console Connecting to a Database using JDBC Creating New Databases.

This FAQ complements Sun's official Java Web Start FAQ page and aims to provide you with information that is not included on the official page for whatever reason. The real story on container, cloud, and data adoption. Poll results reveal where and why organizations choose to use containers, cloud platforms, and data pipelines.

Java for the Web with Servlets, JSP, and EJB: A Developer's Guide to J2EE Solutions: A Developer's Guide to Scalable Solutions [Budi Kurniawan] on initiativeblog.com *FREE* shipping on qualifying offers. Java for Web with Servlets, JSP and EJB is the one book you need to master Java web programming.

It covers all the technologies needed to program . This section provides a brief overview of Spring Boot reference documentation. Think of it as map for the rest of the document.

You can read this reference guide in a linear fashion, or you can skip sections if something doesn’t interest you. Entry Requirements. It is recommended that students have a good command of the English language and a facility for Mathematics prior to starting a Certificate or Diploma Program.