Downloaded maven dependecies in eclipse using
<dependency>
<groupId>org.apache.beam</groupId>
<artifactId>beam-runners-direct-java</artifactId>
<version>0.3.0-incubating</version></dependency>
<dependency>
Only org.apache.beam.sdk.io,Only org.apache.beam.sdk.io.range are downloaded.
but .io.jdbc is not being downloaded in dependencies.
Is there any other specific artifactId I have to use for this other than the above mentioned?
Apache Beam (incubating) publishes several convenience binaries to Maven Central Repository with every release.
There isn't an artifact that captures the whole project. Instead, you should be using specific components that you actually need (perhaps core SDK, any additional libraries, and a runner).
Specifically, if you'd like to use Beam's JDBC connector, depend on the following artifact (among other things):
<dependency>
<groupId>org.apache.beam</groupId>
<artifactId>beam-sdks-java-io-jdbc</artifactId>
<version>${some_version}</version>
<dependency>
Also, we are currently adding Quickstart to our webpage, which will cover some of this information. At this moment, this is still work-in-progress.
You can Directly Download the jar file and put it into your project library. The link to download is-
Org.apache.beam.sdk.io.java.jdbc
I have an old Spring MVC project which I used to run with Eclipse on JBoss and using JPA 2.0 with (I believe) a PostgreSQL 9.1 DB. Also using Maven as dependencies resolver.
I managed to get the project back from an HDD crash but I couldn't get it to run properly using Eclipse/Tomcat so I thought I might use the opportunity to start using STS (Spring Tool Suite) and get a clean project and just re-insert the code where it belongs.
Sadly, I'm stuck at the very beginning... I created a Spring MVC project with Maven support, but can't set up the JPA 2.0 part.
I went to Project > Properties > Project Facets, checked JPA and clicked on the freshly appeared link "Further configuration required...".
This brought me to the JPA Facet configuration panel where I can choose from two platforms "Generic 2.1" and "EclipseLink 2.5.x". I could only find some noSQL and Oracle support for EclipseLink so I thought I would go for Generic 2.1 (does that mean it's JPA 2.1 ?).
Now I can choose a JPA implementation "User Library" or "Disable Library Configuration".
I tried importing the .jar defined by this maven dependency:
<dependency>
<groupId>org.hibernate.javax.persistence</groupId>
<artifactId>hibernate-jpa-2.0-api</artifactId>
<version>1.0.1.Final</version>
</dependency>
But it just tells me "The class 'javax.persistence.Convert' is required to be in the selected libraries".
Maybe Hibernate's version of JPA isn't "Generic 2.1" compliant ?
I've seen a few times "you need to download Hibernate tools" but that didn't change anything.
Also, when I try to create a connection using PostgreSQL, I don't have any driver to choose from and if I want to add one, the only one I'm allowed to add is a jdbc-postgres-8.x driver.
After clicking the "Further configuration required..." link, click the download icon
to the right of the (probably empty) list. That will give you a set of libraries that
you can select and download and then choose from afterwards, such as an EclipseLink library.
See the screenshot
As far as I know JPA 2.0 has been approved as final in December 2009.
But the central repository gives the pom file declaration for 1.0.2 and 3.0-public_review.
So how can I use the current version of JPA 2.x using maven?
JPA itself is just the API definition, you'll need a provider who has implemented the API. I tend to use hibernate but there are others such as EclipseLink or OpenJPA. If you stick to just the core JPA functionality then you'll be able to swap providers at a later date easily enough.
Your choice of provider may be influenced if you're using a particular EE application server. JPA is part of the EE spec now but each server uses a different provider. E.G. JBoss uses hibernate while glassfish uses EclipseLink I believe.
With that in mind this is how I declare my hibernate dependency in my pom.xml.
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>4.2.8.Final</version>
</dependency>
This will automatically pull in the JPA 2.0 API jar along with other dependencies such as validation.
I'm currently working on a project that requires EntityManager EntityManagerFacotry and Persistence each from the javax.persistence package. It seems to be for the database service, but the current code is not very well documented. By searching google it seems that there should be an xml file that comes along with this, but there isn't one of those either. I guess my question is simply how do I make these unresolved imports go away? Do I have to add another jar to the build path? It seems that I shouldn't have to since it's been around since 1.5.
Any help is greatly appreciated.
I ran into this same issue and realized that, since I am using spring boot, all I needed to do to resolve the issue was to add the following dependency:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
Yes, you will likely need to add another jar or dependency
javax.persistence.* is part of the Java Persistence API (JPA). It is only an API, you can think of it as similar to an interface. There are many implementations of JPA and this answer gives a very good elaboration of each, as well as which to use.
If your javax.persistence.* import cannot be resolved, you will need to provide the jar that implements JPA. You can do that either by manually downloading it (and adding it to your project) or by adding a declaration to a dependency management tool (for eg, Ivy/Maven/Gradle). See here for the EclipseLink implementation (the reference implementation) on Maven repo.
After doing that, your imports should be resolved.
Also see here for what is JPA about. The xml you are referring to could be persistence.xml, which is explained on page 3 of the link.
That being said, you might just be pointing to the wrong target runtime
If i recall correctly, you don't need to provide a JPA implementation if you are deploying it into a JavaEE app server like JBoss. See here "Note that you typically don't need it when you deploy your application in a Java EE 6 application server (like JBoss AS 6 for example).". Try changing your project's target runtime.
If your local project was setup to point to Tomcat while your remote repo assumes a JavaEE server, this could be the case. See here for the difference between Tomcat and JBoss.
Edit: I changed my project to point to GlassFish instead of Tomcat and javax.persistence.* resolved fine without any explicit JPA dependency.
If anyone is using Maven, you'll need to add the dependency in the POM.XML file. The latest version as of this post is below:
<dependency>
<groupId>org.hibernate.javax.persistence</groupId>
<artifactId>hibernate-jpa-2.1-api</artifactId>
<version>1.0.0.Final</version>
</dependency>
hibernate-distribution-3.6.10.Final\lib\jpa : Add this jar to solve the issue. It is present in lib folder inside that you have a folder called jpa ---> inside that you have hibernate-jpa-2.0-1.0.1.Final jar
When I ran into this problem, I tracked down enough to fix my problem and move on.
The short version is:
At some point in time Oracle open-sourced J2EE code and the Eclipse foundation took it over.
The transition took a while so information came out during the transition which was transitory in nature. As a result, you might find articles that were only useful during the transition.
The javax.persistence package was moved to a newly named dependency (jakarta.persistence. The persistence package is part of the larger JPA (Java Persistence API). See Intro to JPA.
The Java Persistence API was first released as a subset of the Enterprise JavaBeans 3.0 specification (JSR 220) in Java EE 5. It has since evolved as its own spec, starting with the release of JPA 2.0 in Java EE 6 (JSR 317). JPA was adopted as an independent project of Jakarta EE in 2019. The current release as of this writing is JPA 3.1.
There were issues with SpringBoot pulling in multiple javax.persistence dependencies, Spring-Boot Issue 21220.
Spring and SpringBoot updated their dependencies to use the new location. From Infoq.com, Nov 24, 2022
VMware released the long-anticipated Spring Framework 6 and Spring Boot 3. After five years of Spring Framework 5, these releases start a new generation for the Spring ecosystem. Spring Framework 6 requires Java 17 and Jakarta EE 9 and is compatible with the recently released Jakarta EE 10
If you are on this page looking for answers, most likely it's because your code doesn't compile because it can't find javax.persistence. If this is the case, then you'll either need to:
add the dependency to jakarta.persistence.
Or use older versions of Java and JPA dependencies define classes in the javax.persistence package.
In the future or if you choose to you can rename references from javax.persistence to jakarta.persistence. The same class files in javax.persistence also exist in the jakarta.persistence package.
To fix my problem I added the following dependency:
<dependency>
<groupId>jakarta.persistence</groupId>
<artifactId>jakarta.persistence-api</artifactId>
</dependency>
I was using SpringBoot 2.2.2.RELEASE af the time which picked up version 2.2.3 of the jar file (jakarta.persistence-api-2.2.3.jar).
This jar file contained (at least) the following packages:
javax.persistence
javax.persistence.criteria
javax.persistence.metamodel
javax.persistence.spi
based on what my IDE is telling me.
The following articles were helpful for me to get to the solution I needed:
The SO question about this and the answer - https://stackoverflow.com/a/60024749/3281336 which pointed to links I've also included below. Thanks to #Krisz for that.
Explanation of why javax.persistence package was moved to jakarta dependency - https://blogs.oracle.com/javamagazine/post/transition-from-java-ee-to-jakarta-ee This article is good because it gives old dependencies along with the newer dependencies that are needed
SpringBoot 3 & Spring Framework 6 use Jakarta EE 9 - https://www.infoq.com/news/2022/11/spring-6-spring-boot-3-launch/
My solution was to select the maven profiles I had defined in my pom.xml in which I had declared the hibernate dependencies.
CTRL + ALT + P in eclipse.
In my project I was experiencing this problem and many others because in my pom I have different profiles for supporting Glassfish 3, Glassfish 4 and also WildFly so I have differet versions of Hibernate per container as well as different Java compilation targets and so on. Selecting the active maven profiles resolved my issue.
I solved the problem by adding the following dependency
<dependency>
<groupId>javax.persistence</groupId>
<artifactId>persistence-api</artifactId>
<version>2.2</version>
</dependency>
Together with
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jdbc</artifactId>
</dependency>
If you are using Gradle with spring boot and spring JPA then add the below dependency in the build.gradle file
dependencies {
compile group: 'org.springframework.boot', name: 'spring-boot-starter-data-jpa', version: '2.1.3.RELEASE'
}
In newer hibernate jars, you can find the required jpa file under "hibernate-search-5.8.0.Final\dist\lib\provided\hibernate-jpa-2.1-api-1.0.0.Final". You have to add this jar file into your project java build path. This will most probably solve the issue.
Add this to your dependency if your using maven
<dependency>
<groupId>javax.persistence</groupId>
<artifactId>javax.persistence-api</artifactId>
<version>2.2</version>
</dependency>
If you are using Hibernate as a JPA implementation and you are not using Maven/Gradle, the easier way is to download whole bundle instead of jar file one by one.
Go http://hibernate.org/orm/downloads/ and download the latest library, extract the jar from the required folder.
Sad and ashamed to say that after spending 1 hour on same problem (unable to resolve #Entity and javax.persistence) occurring on STS/Eclipse and with all the imports (implementation 'org.springframework.boot:spring-boot-starter-data-jpa'). Turns out it was issue with STS/Eclipse IDE because exactly same code worked on IntelliJ IDE. If nothing works give another IDE a go.
If you are not using Maven/Gradle to import the dependency, simply just download this jar from maven repository and set in build path on Eclipse or your preferred IDE.
https://mvnrepository.com/artifact/javax.persistence/javax.persistence-api/2.2
I cannot quite understand what we need maven for and what dependency is.
Could anyone explain in simple words what means? Where does it look for them?
When writing:
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>eclipselink</artifactId>
<version>2.0.0</version>
</dependency>
It tells:
Missing artifact org.eclipse.persistence:eclipselink:jar:2.0.0
What does it mean?
I have 2 versions of maven installed on my system - one for the cmd, the second one as a plugin for eclipse. What is the difference? Which way is it more common to use Maven - from the cmd or from eclipse?
And I read somewhere that maven needs connection to the internet - what is that for?
I guess you are newbie to Maven, I would suggest you to go through the following links
What is Maven?
DeveloperWorks article
Article in Java World
More Maven articles
Maven is a build tool (like ant) which can pull specific versions of libraries and other dependencies from an online server. If you want to use methods which are in a library (even an older version of it) you don't need to install the library on your computer, maven will grab the specified version and store it for you. You can even have two projects which use two different versions of the same library and not have any conflicts, as maven will handle all the libraries for you.
The code you have specifies that you will be using version 2.0.0 of the eclipselink library. Maven will search for that version of that library, first in its cache of libraries and then in the online database, and compile your code along with the library, so your classes have access to the library methods.
I don't think either the command line or eclipse plugin are more popular - I use mostly command line but have both installed.
As to why maven is indicating that your dependencies is missing, you can use http://mvnrepository.com to find dependencies in the maven central repository. Searching for "org.eclipse.persistence" reveals that might actually be needing:
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>javax.persistence</artifactId>
<version>2.0.0</version>
</dependency>