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author | Marko Gronroos <magi@vaadin.com> | 2016-03-03 15:33:25 +0200 |
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committer | Marko Gronroos <magi@vaadin.com> | 2016-03-03 15:33:25 +0200 |
commit | 10a9b9961214400526a4ab03d12e5683117a96f6 (patch) | |
tree | c8cd2a6ac35887f99f2904da2bc008d57aef8525 /documentation/tutorial.adoc | |
parent | 83bffb42f708226f10ed92521cb6dcc124047a6c (diff) | |
download | vaadin-framework-10a9b9961214400526a4ab03d12e5683117a96f6.tar.gz vaadin-framework-10a9b9961214400526a4ab03d12e5683117a96f6.zip |
Cropped project wizard screenshots and such.
Change-Id: I2b5c82d8a15a4cc7bae56ded8a3bb325994d9d42
Diffstat (limited to 'documentation/tutorial.adoc')
-rw-r--r-- | documentation/tutorial.adoc | 203 |
1 files changed, 106 insertions, 97 deletions
diff --git a/documentation/tutorial.adoc b/documentation/tutorial.adoc index 8a5746c44c..5530310199 100644 --- a/documentation/tutorial.adoc +++ b/documentation/tutorial.adoc @@ -8,7 +8,7 @@ layout: page // :sectnums: :imagesdir: img -= Vaadin Tutorial +== Vaadin Tutorial :toc: macro This tutorial gives you an overview of how you can use https://vaadin.com/framework[Vaadin Framework] to build single-page web UIs for your Java application. @@ -18,7 +18,7 @@ No extensive knowledge of Java is needed, only basic programming skills are requ toc::[] -== Overview +=== Overview In this tutorial, we build a simple customer management system. It is not a real application; we use an in-memory "back-end", so that you can understand how to hook it to an existing Java based back-end. @@ -52,18 +52,32 @@ Archetypes are project stubs that have some example code and a basic Maven build . Start by choosing "File > New > Maven Project" from the menu. + .Create a new Maven project -image::createMavenProject.jpg[] +image::createMavenProject.jpg[width=70%] + TIP: If the [guilabel]#Maven Project# is not visible in the menu, you should switch to the _Java EE_ perspective. You can use the shortcut button in the tool bar or "Window > Perspective" to switch to the perspective. -+ -The first step in the wizard is good as is for our purpose. + +. The first step in the wizard is good as is for our purpose. +Just click [guibutton]#Next#. . In the second step, you need to choose the `vaadin-archetype-application` archetype. + +.Selecting the archetype +image::projectWizard2-top.jpg[width=70%] ++ You can first try to find it using the filtering function. + -If Eclipse has not yet indexed the archetype catalog, you need to manually add the archetype details. Click the [guibutton]#Add Archetype# button and enter the following values: +If Eclipse has not yet indexed the archetype catalog, you need to manually add the archetype details. +// + +// .Adding a new archetype +// image::projectWizard2-add.jpg[width=70%] ++ +Click the [guibutton]#Add Archetype# button. ++ +.Settings for a new archetype +image::projectWizardAddArchetype-crop.jpg[width=70%] ++ +Enter the following values: + [guilabel]#Group ID#:: Give `com.vaadin` @@ -75,6 +89,10 @@ If Eclipse has not yet indexed the archetype catalog, you need to manually add t This can be left blank. + +And click [guibutton]#OK#. +Now you can select the new archetype from the list. + ++ WARNING: Eclipse has a bug in its project wizard. The `vaadin-archetype-application` may not appear in the listing, even though you added it using the [guibutton]#Add Archetype# button. If this occurs, close the whole new project wizard and re-open it by selecting "File > New > Maven Project" again. @@ -101,146 +119,137 @@ Compiling them takes a while. TIP: For the Maven compilation to work you need a JDK to be configured in your Eclipse in "Window > Preferences > Java > Installed JREs > Add...". This step is necessary at least on Windows, if you are using a fresh installation of Eclipse or for some other reason haven't configured a JDK to your Eclipse. -The JDK by default installs to _\Program Files\Java_ on Windows. +The JDK by default installs to [filename]#\Program Files\Java# on Windows. You can make JDK the default JRE for your Eclipse. -While the build is running, let's have a look at what the archetype created for -you. You can browse your project resources from the tree structure in the -_Project Explorer_. Maven's _pom.xml_ on top level contains settings for your -projects build and declares the used dependencies. Open _Java Resources_ and -below it _src/main/java_, the main source directory, and _my.vaadin.app_, the -main Java package that will contain your Vaadin UI code. +While the build is running, let us have a look at what the archetype created for +you. +You can browse your project resources from the tree structure in the [guilabel]#Project Explorer#. +Maven's [filename]#pom.xml# on top level contains settings for building your project and declares the used dependencies. +Open [guilabel]#Java Resources# and below it [filename]#src/main/java#, the main source directory, and [packagename]#my.vaadin.app#, the main Java package that will contain your Vaadin UI code. -TIP: Eclipse shows all project files in the Project Explorer. In this case you -can also find your _.java_ files via top level _src_ node, but the suggested -method is to access them via the _Java Resources_ node, which is optimized for -editing Java source code. +TIP: Eclipse shows all project files in the Project Explorer. +In this case, you can also find your [filename]#.java# files from under the top-level [filename]#src# node. +However, the suggested method is to access them from under the [guilabel]#Java Resources# node, which is optimized for editing Java source code. The UI code (and the Servlet declaration) used by the application stub can be -found in the _MyUI.java_ file. Let's read it through to see how it works. The -_init_ method of a UI class is triggered when a user enters your web -application. The VerticalLayout is one of the most used layout objects, which -are used to position and display other Vaadin components in your UI classes. The -example code creates one TextField to allow the user to input her name and a -Button whose click listener dynamically adds a new Label component to the main -layout. In the end of the init method we just configure the main layout and -place components into it and set it to be the content of MyUI. - -To test your first Vaadin application, right click on the project and choose -menu:Debug as[Maven build...]. The debug mode is slightly slower than the basic run -mode, but it often helps you to figure out what is happening in your -application. +found in the [filename]#MyUI.java# file. +Let us read it through to see how it works. +The [methodname]#init()# method of a UI class is triggered when a user enters your web application. +The [classname]#VerticalLayout# is one of the most used layout components, which +are used to position and display other Vaadin components in your UI classes. +The example code creates one [classname]#TextField# to allow the user to input her name and a [classname]#Button# whose click listener dynamically adds a new [classname]#Label# component to the main layout. +In the end of the [methodname]#init()# method, we just configure the main layout and place components into it and set it to be the content of [classname]#MyUI#. -image::debugAsMavenBuild.jpg[Starting the server using a Maven target] +To test your first Vaadin application, right-click on the project and choose "Debug as > Maven build...". +The debug mode is slightly slower than the basic run mode, but it often helps you to figure out what is happening in your application. -In the dialog, type _Run in jetty_ to the _Name_ input and _jetty:run_ to the -_Goals_ input. +.Starting the server using a Maven target +image::debugAsMavenBuild.jpg[] -image::debugAsMavenBuild2.jpg[Generating a Maven launch for jetty:run target] +In the dialog, type `Run in jetty` to the [guilabel]#Name# input and `jetty:run` to the [guilabel]#Goals# input. + +.Generating a Maven launch for `jetty:run` target +image::debugAsMavenBuild2.jpg[] Before clicking debug, to make sure debugging works properly, add your Java -project to the source lookup path from the _Source_ tab, like it is being done -in the image below. +project to the source lookup path from the [guilabel]#Source# tab, as it is being done in <<figure.tutorial.creating.add-sources>>. -image::debugAsMavenBuildAddSources.jpg[Adding sources for debugging] +[[figure.tutorial.creating.add-sources]] +.Adding sources for debugging +image::debugAsMavenBuildAddSources.jpg[] -Now click _Debug_ to continue. This will download a small Java web server -(if not cached to your local Maven repository), and use it to host -your application. Once the server has started, point your browser to the URL -http://localhost:8080/[http://localhost:8080/] to see the running application. +Now click [guibutton]#Debug# to continue. +This will download a small Java web server (if not cached to your local Maven repository), and use it to host your application. +Once the server has started, point your browser to the URL http://localhost:8080/[http://localhost:8080/] to see the running application. -If you make changes to the code, the jetty server will notice the changes and in -a couple of seconds most changes are automatically deployed. Reloading the page -in your browser will show the changes. +If you make changes to the code, the Jetty server will notice the changes and in +a couple of seconds most changes are automatically deployed. +Reloading the page in your browser will show the changes. -TIP: In some cases your JVM might not allow injecting changes on the fly. In -these cases, Eclipse will complain about "Hot code replacement error". Just -choose to restart the server to get the latest changes. Many Java developers use -a commercial tool called http://zeroturnaround.com/software/jrebel/[JRebel] to make code -replacement work better. +TIP: In some cases your JVM might not allow injecting changes on the fly. +In these cases, Eclipse will complain about "Hot code replacement error". +Just choose to restart the server to get the latest changes. +Many Java developers use a commercial tool called http://zeroturnaround.com/software/jrebel/[JRebel] to make code replacement work better. -Mastering the usage of the java debugger is also handy to better understand how your -application actually works and fixing bugs that all developers write at some -point. As Vaadin is "only" Java code, you can use all of Java's debugging tools, which cannot be done with other UI frameworks where the UI is written (partly) in HTML and/or JavaScript. Double click on the line number in the Java editor, for example of the -following line in the click listener: +Mastering the usage of the Java debugger is also handy to better understand how your application actually works and fixing bugs that all developers write at some point. +As Vaadin is "only" Java code, you can use all of Java's debugging tools, which cannot be done with other UI frameworks where the UI is written (partly) in HTML and/or JavaScript. +Double-click on the line number in the Java editor, for example of the following line in the click listener: [source,java] ---- - layout.addComponent(new Label("Thanks " + name.getValue() +layout.addComponent(new Label("Thanks " + name.getValue())); ---- -This will add a breakpoint to the selected line. If you then click the button in -your browser, the execution of the application will stop on that line. Eclipse -will ask you to enter to _Debugging perspective_ and you can inspect its -variables and step through the execution. Clicking on the _play_ icon in the -toolbar will continue the execution. Double click the same line again to remove -the breakpoint. +Doing so adds a breakpoint to the selected line. +If you then click the button in your browser, the execution of the application will stop on that line. +Eclipse will ask you to enter to _Debugging perspective_. +That way you can step through the execution and inspect the variables. +Clicking on the _play_ icon in the toolbar will continue the execution. +Double-click the same line again to remove the breakpoint. -image::debugInBreakPointVariable.jpg[Execution in a break point in the button click listener] +.Execution in a break point in the button click listener +image::debugInBreakPointVariable.jpg[] -Clicking the red square in the Console view will terminate the server process. -You can restart it easily form the run/debug history. You can find that from the -small down arrow next to the green play button or bug button (for the debug -mode) in the toolbar. Alternatively you can use the main menu menu:Run[Run -history/Debug history > Run in Jetty]. +Clicking the red square in the [guilabel]#Console# view will terminate the server process. +You can restart it easily form the run/debug history. +You can find that from the small down arrow next to the green play button or bug button (for the debug mode) in the tool bar. +Alternatively, you can use the main menu "Run > Run +history/Debug history > Run in Jetty". -To get back to the _Java EE Perspective_, an Eclipse mode designed for editing -Java web app code, click the _Java EE_ button in the toolbar. +To get back to the _Java EE Perspective_, an Eclipse mode designed for editing Java web app code, click the [guibutton]#Java EE# button in the toolbar. == Adding a demo "backend" -Before getting more into real Vaadin development, let's introduce some domain -objects and a "fake backend". In a real world application, you'll most likely -have something similar, implemented with, for example, JPA and EJB or a Spring based -service. +Before getting more into real Vaadin development, let us introduce some domain objects and a "fake backend". +In a real-world application, you will most likely have something similar, implemented with, for example, JPA and EJB or a Spring-based service. -Copy the following three classes from github to your project. Class names -point to the classes hosted in Github. Copying classes can be done in many ways. +Copy the following three classes from github to your project. +Class names point to the classes hosted in Github. +Copying classes can be done in many ways. TIP: The fastest way to copy classes using Eclipse is to use your good old clipboard. Select the text content of the whole class from your browser, choose -menu:Edit[Copy], focus the node representing the _my.vaadin.app_ Java package in -Eclipse's Java Resources view and choose menu:Edit[Paste]. Eclipse is smart -enough to automatically create a properly named Java file for the class. +"Edit > Copy", focus the node representing the [packagename]#my.vaadin.app# Java package in Eclipse's Java Resources view and choose "Edit > Paste". +Eclipse is smart enough to automatically create a properly named Java file for the class. * https://raw.githubusercontent.com/vaadin/tutorial/master/src/main/java/my/vaadin/app/CustomerStatus.java[CustomerStatus] - this is a simple enum class - * https://raw.githubusercontent.com/vaadin/tutorial/master/src/main/java/my/vaadin/app/Customer.java[Customer] - this is the main domain object, a basic Java bean that we'll be - using in our example - * https://raw.githubusercontent.com/vaadin/tutorial/master/src/main/java/my/vaadin/app/CustomerService.java[CustomerService] - this is a simple facade via which you can request and modify Customer instances. You can think of this as your entry point to your fake database. + * https://raw.githubusercontent.com/vaadin/tutorial/master/src/main/java/my/vaadin/app/Customer.java[Customer] - this is the main domain object, a basic Java bean that we will be using in our example + * https://raw.githubusercontent.com/vaadin/tutorial/master/src/main/java/my/vaadin/app/CustomerService.java[CustomerService] - this is a simple facade via which you can request and modify [classname]#Customer# instances. + You can think of this as your entry point to your fake database. -In the next steps, we'll be using these classes and build a UI around them. The -actual implementation of these classes is not relevant for this tutorial, but -feel free to have a look around. +In the next steps, we will be using these classes and build a UI around them. +The actual implementation of these classes is not relevant for this tutorial, but feel free to have a look around. == Listing entities in a Grid -TIP: Starting from this step directly? https://github.com/vaadin/tutorial/archive/step2.zip[Download the project] for this step, extract the zip file and choose menu:Import...[Maven>Existing Maven project]. +TIP: Starting from this step directly? https://github.com/vaadin/tutorial/archive/step2.zip[Download the project] for this step, extract the zip file and choose "Import... > Maven > Existing Maven project". -Often when you start building a UI for a data centric application, the first -thing you want to do is to list your data from your backend. There are several -components and methods in Vaadin to do this. In this example, we'll use the Grid -component for tabular presentation of our customers. +Often when you start building a UI for a data-centric application, the first +thing you want to do is to list your data from your back-end. +There are several components and ways in Vaadin to do this. +In this example, we will use the Grid component for tabular presentation of our customers. -We'll start by introducing a Grid field to the MyUI class. We could of course -just introduce the Grid as a variable in the init method, but we'll most likely -want to refer to it later. Also, let's get a reference to the CustomerService. +We start by introducing a [classname]#Grid# to the [classname]#MyUI# class. +We could of course just introduce the Grid as a variable in the [methodname]#init()# method, but we most likely want to refer to it later. +Also, let us get a reference to the [classname]#CustomerService#. [source,java] ---- public class MyUI extends UI { - - // Add next two lines: + // Add the next two lines: private CustomerService service = CustomerService.getInstance(); private Grid grid = new Grid(); - // the rest is already there... + // The rest is already there... @Override protected void init(VaadinRequest vaadinRequest) { + ... ---- -TIP: If you are new to Java development, you probably don't feel comfortable -with the red compilation error for the line where the Grid got introduced, due -to a missing import. This is easily fixed in Eclipse by using the +TIP: If you are new to Java development, you probably do not feel comfortable +with the red compilation error for the line where the [classname]#Grid# got introduced, because of a missing import. +This is easily fixed in Eclipse by using the menu:Source[Organize Imports] command. Learn its shortcut (kbd:[Ctrl-Shift-O] or kbd:[CMD-Shift-O] on Macs), you'll be using it a lot in Java development. In possible class name collisions, always choose the appropriate class from the |