Servlet 2.5 vs 3.0

servlet 2.5 vs 3.0

Join Stack Overflow to learn, share knowledge, and build your career. Connect and share knowledge within a single location that is structured and easy to search. I'm rolling J2EE code that adheres to Servlet 2.

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Pointers to official Sun docs and personal experiences are most appreciated. Just as an update and to be more explicit, these are the main differences between servlets 2. In servlets 2. In servlets 3, web. The same example:. In servlets 3, a ServletContextListener can add dynamically servlets, filters and listeners using the following methods added to SevletContext : addServletaddFilter and addListener. Example: say that some servlet container has five threads in its thread pool, and there is a time-consuming process to be executed per request like a complex SQL query.

With servlets 2. With servlets 3. This way the thread is free to receive new responses. The interface AsyncContext also has methods to get the request object, response object and add listeners to notify them when a process has finished.

In servlets 3, the interface HttpServletRequest has been added two new methods: login username, password and logout. Servlet 3. The most important changes in 3. Whether or not these are important to you is impossible for me to say.

The most significant of these is probably the support for asynchronous Servlets. Here's an article that describes this in detail. The full specification can be downloaded here. Check out the Javaone presentation " Java Servlet 3.

This link will give enough info on Servlet 3. Learn more. What are the differences between Servlet 2. Ask Question.

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Asked 11 years, 4 months ago. Active 4 years, 2 months ago. Viewed 61k times. If I shouldn't be concerning myself with 3 for the time being, just say so. Max A. Add a comment. Active Oldest Votes.This article covers most of the important features available as part of Servlet 3. Note that the Servlet 3. This article focuses on the new set of annotations introduced that can be used by developers rather than put the data in the configuration file, followed by the enhanced Pluggability and the extension support for adding third-party frameworks.

The article is finally concluded by detailing about the asynchronous execution of processing and the usage for the same. JSR talks about the Servlet 3. For attitional information please read the reference section of this article. The configuration information about a component in a typical web application is expressed in an external meta file.

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The information about web components such as Servlets, Servlet Filters are mentioned in the deployment descriptor, which is web. Starting from Servlet 3. In fact information specified in the deployment descriptor takes precedence over the information specified through Annotations.

The Servlet 3. The name of the element is metadata-complete and it is a child element of web-app element. The metadata-complete element indicates whether the meta-data information available in the deployment descriptor is complete.

So, if the value for the metadata-complete element is set to a value of true, then it means that the meta information found in the deployment descriptor is complete and eventually the annotations defined on the web components will be ignored by the Servlet Container. If the value for metadata-complete is set to false, then it means that the information in the deployment descriptor is not complete and web components decorated with annotations, if any, should be scanned and processed by the Web Container.

The following annotations are applicable starting from Servlet 3.

servlet 2.5 vs 3.0

In this section, we will see the usage of WebServlet and InitParam using an example. Look at the following code. Instead, to qualify this class as a Servlet class we have annotated using WebServlet annotation.

Note that the name of the servlet is SimpleServlet as specified through the name attribute. The attribute urlPatterns defines a set of url-patterns that can be used to invoke the Servlet. The Servlet Container after scanning this class will generate the deployment descriptor which may look like the following.

The Filter annotation defines a Servlet Filter component for a web application. A filter is typically used to intercept a web request for performing any of the pre-processing operations well before reaching the actual servlet component. Let us see the definition of a filter component using Servlet 3. Again, to support backward compatibility, the annotation information in the above class will be transformed as information in the deployment descriptor by the Servlet Container and the deployment descriptor might look like this.

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The Servlet Context Listener is used to receive events whenever the servlet context is created and destroyed by the Web Container. Let us see an usage of this annotation. Today, most of the modern popular frameworks such as Struts and Spring can be integrated easily with the Web Container for building robust applications. However, most of the time, the integration happens in such a way that the web.This article presents new features introduced in the Servlet 2.

New Features in Servlet 3.0

Servlet 2. This version has major changes since it has to support the Java 5. One of the notable changes will be supporting Generics and Annotations. Using annotations in Java EE environment has simplified the developement process by eliminzating the much need for XML deployment descriptors. EJB 3. In the same way other technologies also have significent updates. One particular technology is Servlet and it is evloving very quickly. This Servlet 2. The minimum requirement for the Servlet 2. Lets look into the Servlet 2.

One of the major change in the Servlet 2. The minimum requirement for Servlet 2.

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The annotations has to be loaded into the containers memory while server start up. This will take up more time since the container has to scan all the files in the classpath including jar files to find all the annotations.

There is option to diable annotations by using the metadata-complete attribute in the web. Look into the folloing sample code:. Optionally container can search on the other location also. We will look into the details of few annotation in the next sections.

The following are the few annotations introduced in the Servlet 2. In the deployment descriptors this can be declared using the ejb-ref and ejb-local-ref elements. Like the following example:.

For example:. Resource annotation used for declaring any of the resources like datasource, messaging destination,etc.

servlet 2.5 vs 3.0

Resource annotation can be used for class,method or a field. Look into the following example:. Resources annotation is used for declaring more than one Resource in a single line. The PostConstruct annotation is declared on a method that does not take any arguments, and must not throw any checked expections. The return value must be void. The method MUST be called after the resources injections have been completed and before any lifecycle methods on the component are called.

The PreDestroy annotation is declared on a method of a container managed component. The method is called prior to component being reomvoed by the container. In session tracking, Servlet 2. Servlets 2. It is not major changes, but even though gives more flexibility on mapping the filters and servlets.This version has been released on September 26, by the Sun MicroSystems.

It is not necessary that all web servers and application servers support the features of Servlet 2. Still most of the popular containers like Tomcat 5. Toggle navigation. Home Servlets Difference between Servlet 2. Difference between Servlet 2.

An Overview of Servlet 3.0

Additional ServletRequest methods : In Servlet 2. The content type can be dynamically set with a combination of setContentTypesetLocaleand setCharacterEncoding calls, and the method getContentType provides a way to view the generated type string. New features has been added in RequestDispatcher: In Servlet 2. This features has been added is Servlet 2.

The following request attributes are: j avax. HttpSession details and interaction with logins has been clarified: The new method HttpSession. If the object in the session can't be serialized in a distributed environment then it must throw an IllegalArgumentException. Welcome file behavior and Classloading has been clarified: In servlet 2. The web. Features of Servlet 2. The list of the added features is given below: Dependency on J2SE 5. All the available features of Jdk1.

Support For annotations: Annotations provide a mechanism for decorating java code constructs classes, methods, fields, etc.

Annotations are mark code in such a way that code processors may alter their behavior based on the metadata information. Several web. A Handful of removed restrictions: Servlet 2. In session tracking, Servlet 2. Some edge case clarifications: : The servlet2. However there is no such clarification given why it is so. It has been described properly in Servlet 2.JSR Servlet 3.

Servlet 3. Ease of Development EoD will be supported using newer language features. A reference implementation is available in the GlassFish v3 nightly build. The public review contains:. In this article we will bring you up to speed with what's happening with the Servlet 3. Note: this article corresponds to the public review of the specification.

As it is not yet final some things may change. Rajiv Mordani from Sun Microsystems is the specification lead with an expert group comprised of many of the most recognisable names in the Java community:. Due to the popularity of so many various web frameworks, Servlet 3.

So if you want to add in Struts, or Spring Web Flow it will be easy to do so. Methods to add Servlets and Filters If a ServletContextListener is registered and wants to add a Servlet or Filter, then at the time of context initialization the event that is fired to the Listener can add Servlets and Filters to the context.

The methods are addServlet and addFilter. Web fragments Instead of having just one monolithic web. A web-fragment is almost identical to the web. The container will use the information to assembe the descriptor for the application and the application needn't have to use any of the boilerplate configuration in their app for the framework.

There are rules that are defined int the specification for conflict resolution, overriding and disabling fragment scanning. Along with the annotations which also can be in libraries the feature is very compelling not only for the developers that use frameworks but also for framework authors to be self sufficient in defining the configuration needed.

The great benefit to this is that library providers can supply their own web. Several new annotations have been defined for ease of development in Servlet 3. These annotations reside in the javax.Join Stack Overflow to learn, share knowledge, and build your career. Connect and share knowledge within a single location that is structured and easy to search. Regarding the new changes in Servlet 3. The new version of Eclipse 4. In addition to the answer given by Eng.

Fouad: Servlet 3. Tomcat 8 or Jetty 9. As for the changes, I collected a number or articles on my ZEEF page that are specifically about the new things in Servlet 3. Learn more. How Servlet 3. Asked 7 years, 4 months ago. Active 3 years, 8 months ago. Viewed 21k times.

Is servlet 3. Which version of eclipse supports servlet 3.

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Add a comment. Active Oldest Votes. Servlet 3. Fouad Eng.

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Arjan Tijms Arjan Tijms Example: true You can also use curl to customize a new topic model. Once a topic model has been successfully created it will have the following properties. Topic Model Status Creating a topic model is a process that can take just a few seconds or a few days depending on the size of the dataset used as input and on the workload of BigML's systems.

The topic model goes through a number of states until its fully completed. Through the status field in the topic model you can determine when the topic model has been fully processed and ready to be used to create predictions.

Thus when retrieving a topicmodel, it's possible to specify that only a subset of fields be retrieved, by using any combination of the following parameters in the query string (unrecognized parameters are ignored): Fields Filter Parameters Parameter TypeDescription fields optional Comma-separated list A comma-separated list of field IDs to retrieve.

To update a topic model, you need to PUT an object containing the fields that you want to update to the topic model' s base URL.

Servlet 2.5 vs 3.0 conflict in SBT build

Once you delete a topic model, it is permanently deleted. If you try to delete a topic model a second time, or a topic model that does not exist, you will receive a "404 not found" response. However, if you try to delete a topic model that is being used at the moment, then BigML.

To list all the topic models, you can use the topicmodel base URL. By default, only the 20 most recent topic models will be returned. You can get your list of topic models directly in your browser using your own username and API key with the following links. You can also paginate, filter, and order your topic models. Time Series Last Updated: Friday, 2017-10-27 12:23 A time series model is a supervised learning method to forecast the future values of a field based on its previously observed values.

It is used to analyze time based data when historical patterns can explain the future behavior such as stock prices, sales forecasting, website traffic, production and inventory analysis, weather forecasting, etc. A time series model needs to be trained with time series data, i. BigML implements exponential smoothing to train time series models. Time series data is modeled as a level component and it can optionally include a trend (damped or not damped) and a seasonality components as explained below:Forecast equation Level equation Forecast equation Level equation Trend equation Forecast equation Level equation Damped trend equation Forecast equation Level equation Trend equation Seasonality equation The different components can have variations, e.

As a result of combining the different variations for each component, several models can be trained for a given objective field. Note that BigML excludes certain combinations for numerical stability reasons such as additive errors with multiplicative trends or multiplicative error and trend with additive seasonality.

BigML computes four different performance measures to select the best model for a given objective field. You can create a time series model selecting one or several fields from your dataset to use as objective fields to forecast their future values. You can also list all of your time series. This can be used to change the names of the fields in the time series with respect to the original names in the dataset or to tell BigML that certain fields should be preferred.

Example: 100 name optional String,default is dataset's name The name you want to give to the new time series. The type of the field must be numerical. Non-numeric fields will be ignored, and if not present, the right-most valid field in the dataset will be used. The period needs to be set taking into account the time interval of your instances and the seasonal frequency.

For example, for monthly data and annual seasonality, the period should be 12, for daily data and weekly seasonality, the period should be 7. It can take values from 0 to 60. If the period is set to 1, there is no seasonality.


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