Why can't my com.vaadin.UI import be resolved?

Why can't my com.vaadin.UI import be resolved? - java

Im trying to import com.vaddin.ui into my Spring Boot Maven java application but it will not resolve my import. When I try to extend UI with MyView class, it keeps importing com.vaadin.flow.component.UI. There is no option for com.vaadin.ui.
Here is my pom.xml file:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.2.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.thompson</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>BuildFirstBootStrap</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>11</java.version>
<vaadin.version>12.0.6</vaadin.version>
</properties>
<dependencies>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-bom</artifactId>
<version>${vaadin.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
Does anyone see a problem within my dependencies or know what could be the problem?
Thanks in advance!

The UI class has been moved to that new package since Vaadin 10. But you don't need to extend UI anymore. You have to use the #Route annotation on a Vaadin component. For example:
#Route("")
public class UsersView extends VerticalLayout {
public UsersView() {
add(new Text("It works!"));
}
}

com.vaadin.flow.component.UI is the correct import with the Vaadin version in your pom.xml. In previous Vaadin versions, the import was com.vaadin.ui.UI, but it has never been com.vaadin.UI.

Related

Class shows up in auto complete but can't be imported -IntelliJ

The Services project uses a class in DataLayer. I have added the dependency to Services POM. When trying to import UserRepository class from DataLayer, IntelliJ autocomplete shows the class but when I press enter,it says "Can not resolve symbol DataLayer".
I checked the local maven repository and can see the Jar file in the proper place.
Tried invalidating cache which did not work.
Reimporting dependencies did not work either.
Here are the POM files of both the projects as well as screenshots from intelliJ
Services - pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.schoolgallery</groupId>
<artifactId>Services</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>Services</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.4.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.schoolgallery</groupId>
<artifactId>DataLayer</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
DataLayer - pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.schoolgallery</groupId>
<artifactId>DataLayer</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>DataLayer</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.4.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
Error appears as :
EDIT
The project has an MVC architecture with separate modules for API,Services and DataLayer.
Please find the project structures for services and datalayer.

Adding the parent POM dependency to the Child projects did the trick !!
<parent>
<artifactId>parent-pom</artifactId>
<groupId>com.schoolgallery</groupId>
<version>0.0.1-SNAPSHOT</version>
</parent>
Remember to change the spring boot starter parent if you have a custom parent POM , because having two parent tags will throw an error.
This is described nicely here

Java spring error persistence imports are not working

I am creating a simple Spring boot project. When I try and use #Entity and #Id etc. I get a cannot resolve error why is this? Have I not installed the correct version of something. My Imports don't seem to be working and are highlighted in red. I am new to spring. I have attachedThe error as an image.
The error is Package javax.persistence does not exist??
My Pom.xml:
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.JohnSharp</groupId>
<artifactId>Guestbooknew</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>Guestbooknew</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.1.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>

Right click on your project -> Maven -> Update project.
For intellij:
Right click on your project > Maven > Reimport

spring-boot-starter-jetty and Jetty modules - Maven magic

We're using spring-boot-starter-jetty in our maven pom, which means we don't have any direct dependency on jetty hence no control on its version.
This all works good, but we now need to add a dependency onone of jetty's modules, which are using the same jetty version convention.
This is all great and dandy, but because we can't use spring-boot-starter-jetty as our root pom, we're declaring jetty's version again under the module's dependency declaration, something like this:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jetty</artifactId>
<version>1.4.3-RELEASE</version>
</dependency>
<dependency>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-nosql</artifactId>
<version>9.3.14.v20161028</version>
</dependency>
This is no fun PLUS dangerous as if we upgrade one of them, we have to remember to upgrade the latter to the same version.
I know we can add an exclude under the module's dependency but this feels like a hack plus still doesn't fully protect us from breaking changes.
Is there anyway to extract the jetty version from spring boot and reuse it for the module's dependency?
Thanks!!

Maven creates the version properties for it's dependencies in the effective POM. For jetty it's jetty.version
So your dependencies will become
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jetty</artifactId>
</dependency>
<dependency>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-nosql</artifactId>
<version>${jetty.version}</version>
</dependency>
Here's complete POM
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>TestDependency</groupId>
<artifactId>TestDependency</artifactId>
<version>1.0.0</version>
<packaging>jar</packaging>
<name>TestDependency</name>
<description>TestDependency</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.3.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jetty</artifactId>
</dependency>
<dependency>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-nosql</artifactId>
<version>${jetty.version}</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
It's worth pointing out that this is not required with the latest version of Spring Boot. I checked with the 1.5.4.RELEASE. Following is suficient.
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jetty</artifactId>
</dependency>
<dependency>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-nosql</artifactId>
</dependency>
Complete POM
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>TestDependency</groupId>
<artifactId>TestDependency</artifactId>
<version>1.0.0</version>
<packaging>jar</packaging>
<name>TestDependency</name>
<description>TestDependency</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.4.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jetty</artifactId>
</dependency>
<dependency>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-nosql</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
Effective POM can be generated by using following command
mvn help:effective-pom
Or if you're using Spring Tool Suite or latest version of Eclipse then you can directly check it inside the bottom tab in the Maven POM Editor
Edit
Without spring-boot parent pom the same can be done using dependencyManagement
Following is the complete pom without spring-boot parent
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>TestDependency</groupId>
<artifactId>TestDependency</artifactId>
<version>1.0.0</version>
<packaging>jar</packaging>
<name>TestDependency</name>
<description>TestDependency</description>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.3.RELEASE</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jetty</artifactId>
</dependency>
<dependency>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-nosql</artifactId>
<version>${jetty.version}</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>

IntelliJ IDEA can not find TestingServer on my classpath

I can find TestingServer in my External Libraries (see screenshot below), but why can I not import it? Is the curator-test library not in my classpath?
I'm using:
• IntelliJ Idea 2017.1.2
• Spring Boot 1.5.3.RELEASE
• Apache Curator 2.11.1
My pom.xml looks as follows.
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.fan.curator</groupId>
<artifactId>fan-curator-demo01</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>fan-curator-demo01</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.3.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
<spring-cloud.version>Dalston.RELEASE</spring-cloud.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-zookeeper-config</artifactId>
</dependency>
<dependency>
<groupId>org.apache.curator</groupId>
<artifactId>curator-test</artifactId>
<version>2.11.1</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
These are my external libraries in IntelliJ IDEA.
This is the error I get; TestingServer cannot be imported.

I just find out why.
Spring boot make the curator-test's scope test(I don't know why).
So I add a compile scope to its artifact, and it's ok now.

Spring dependencies not resolved in Spring Tool Suite

I started a tutorial in Spring.
I downloaded Spring Tool Suite, then created the demo project offered as a template, then I created a class and wrote the following code:
package com.example;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ResponseBody;
#Controller
public class WhateverIWant {
#RequestMapping("/hi")
public #ResponseBody String hiThere() {
return "hello world!";
}
}
The problem is that ResponseBody and RequestMapping are not recognized.
I right clicked on the project and did a Run As and then mvn clean and mvn install, but still the dependencies are not recognized.
My pom.xml:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.example</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>demo</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.1.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
How can I make Spring Tool Suite be aware of the dependencies?

The problem is that ResponseBody and RequestMapping are not
recognized.
You are missing the following dependency in your pom.
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency>

Add spring-web jar
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>3.2.3.RELEASE</version>
</dependency>

Develop Reference

Java is a programming language and computing platform first released by Sun Microsystems in 1995.

Why can't my com.vaadin.UI import be resolved? - java

The UI class has been moved to that new package since Vaadin 10. But you don't need to extend UI anymore. You have to use the #Route annotation on a Vaadin component. For example: #Route("") public class UsersView extends VerticalLayout { public UsersView() { add(new Text("It works!")); } }

com.vaadin.flow.component.UI is the correct import with the Vaadin version in your pom.xml. In previous Vaadin versions, the import was com.vaadin.ui.UI, but it has never been com.vaadin.UI.

Related

Class shows up in auto complete but can't be imported -IntelliJ

Java spring error persistence imports are not working

spring-boot-starter-jetty and Jetty modules - Maven magic

IntelliJ IDEA can not find TestingServer on my classpath

Spring dependencies not resolved in Spring Tool Suite

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