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'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>
I'm trying to setup a new gwt project in Eclipse (3.4 Ganymede) using maven with the codehause gwt-mave-plugin (v. 1.1).
I have installed the Google Eclipse Plugin including the Google App Engine Java SDK 1.2.2, the Google Plugin for Eclipse 3.4 and the Google Web Toolkit SDK 1.7.0.
I'm using the gwt-maven-plugin archetype to generate a sample project as specified here.
I have successfully generated the project files and imported them as a maven project into eclipse. I have then generated a launch script using mvn: gwt:eclipse as specified here: mojo.codehaus.org/gwt-maven-plugin/user-guide/hosted.html.
The genereated launch script gets recognized by the Google Eclipse Plugin which tries to launch it as a gwt app when right-clicking and choosing run. However, the app fails to start with the following error:
Exception in thread "main" java.lang.NoClassDefFoundError: com/google/appengine/tools/development/DevAppServerMain
Does anyone know what I'm missing here? Any help or links to other resources of information would be greatly appreciated!
Thanks,
Joakim
The solution was embarrassingly simple. I had forgotten to mark the eclipse project as a GWT project (done by right-clicking on the project, choosing Google -> Web Toolkit Settings and checking a box). This caused the required classes to appear in the classpath as expected.
It appears the appengine package is not in your classpath. I personally have never used GWT but a quick google turned up this:
<parent>
<groupId>com.google</groupId>
<artifactId>google</artifactId>
<version>1</version>
</parent>
That was from googles site. You need to inherit from their pom perhaps. I am assuming that is what the archetype should have been doing. You may want to take a look at this.
You will need to add references to the Google Maven repository so the dependencies and parent POM can be downloaded.
<pluginRepositories>
<pluginRepository>
<id>gwt-maven</id>
<url>http://gwt-maven.googlecode.com/svn/trunk/mavenrepo</url>
</pluginRepository>
</pluginRepositories>
<repositories>
<repository>
<id>gwt-maven</id>
<url>http://gwt-maven.googlecode.com/svn/trunk/mavenrepo/</url>
</repository>
</repositories>
I'm trying to find a maven repo to allow me to add BIRT reporting dependencies to a Eclipse Dynamic Web project.
The closest I've found is http://repository.jboss.org/maven2/org/eclipse/birt/, but when that repo is added to the m2eclipse indexes, the BIRT artifacts are not found. As per http://dev.eclipse.org/newslists/news.eclipse.technology.m2e/msg00389.html (I'm not the author of the post there, that was just my source for the repo link)
I'm using, or trying to, BIRT 2.3.2
How are you defining your dependencies? and what types specifically are you looking for?
Looking at the repository, it contains the Birt jars and poms. If this is a standard Maven project you are able to declare the dependency as normal. So to reference core-api you should just have to do:
<dependency>
<groupId>org.eclipse.birt</groupId>
<artifactId>coreapi</artifactId>
<version>2.3.2</version>
</dependency>
and ensure the repository is configured correctly in your settings or POM.
Can you post your POM and the trace from the build? it might help diagnose the problem.
Update: Based on your comment, it looks like the issue is that the JBoss Nexus index does not have the Birt projects on it. The dates for the index and both versions of Birt (all artifacts for 2.3.2 and 2.2.2) are both 8th July, and the index is only 83 minutes younger.
Creation of the Nexus index is not automatic, so perhaps the indexer was run before the Birt artifacts were deployed and then published afterwards.
Below maven dependency worked for me perfectly.
<repositories>
<repository>
<id>sonatype-nexus-releases</id>
<name>Sonatype Nexus Releases</name>
<url>https://oss.sonatype.org/content/repositories/releases/</url>
</repository>
</repositories>
It worked for me for birt 3.7.1, try replacing version as per your need.
Thanks