In pom.xml for hibernate:
<dependency>
<groupId>org.hibernate.javax.persistence</groupId>
<artifactId>hibernate-jpa-2.0-api</artifactId>
</dependency>
there is not version. But when I add to my application pom in Eclipse I receive error
that version must be. Why this difference?
Thanks.
The 2.0 is the version of the JPA supported not the version of the artifact
try
<dependency>
<groupId>org.hibernate.javax.persistence</groupId>
<artifactId>hibernate-jpa-2.0-api</artifactId>
<version>1.0.1.Final</version>
</dependency>
Arnon
Maven needs to know what version to download/check.
Add a version element as a child of dependency.
The extract you saw in the dependencies of hibernate actually has a version which is defined in a parent pom, in its dependencyMgmt section. This allows to only define in one place the version to use and all children of that parent pom only need to indicate which dependency they want and they automatically get the version specified in the parent.
Add a <version> in your case, or also use a dependencyMgmt section in your pom.xml to indicate the version of hibernate-jpa-2.0-api you want.
There are two ways of resolving these issue:
-insert yourself the version such that Maven knows what dependency you need (it either searches in the local repository for it or downloads from a maven repository or you can give it a link from where to download it)
-add a parent that uses the artifact that you are calling and then you don't need the version (it takes the parent version)
Related
My question is very simple:
When i'm creating a maven project if i chose to make my pom inherit from
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.7.2</version>
</parent>
for all dependencies I include, if it is included in the parent's pom i dont need to specify which version i'm using in the inherited pom.
That is an amazing thing and avoid using multiple versions of same library.
the question is, HOW TO ACHIEVE THIS BEHAVIOR
I've a parent pom for my projects, but when I extend it, the childs pom still need to specify each dependency version evem thought it is specified in the parents pom... this causes me the need to update dependencies version multiple places everytime one dependency changed it's version
I end up by doing somthing like (child pom):
<dependency>
<groupId>br.com.fisgar</groupId>
<artifactId>fisgar-model</artifactId>
<version>${project.version}</version>
</dependency>
but i would like to make possible omit the version as a whole, same way as the spring dependency.
how can i do that
In the parent.pom add dependency with version to <dependencyManagement> section. In this case, in the child.pom you will be able to add this dependency without version.
You can get more details in the official documentation Introduction to the Dependency Mechanism
I have following lines in a Maven POM file
<dependency>
<groupId>com.querydsl</groupId>
<artifactId>querydsl-jpa</artifactId>
<version>4.2.1</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.4.0</version>
</dependency>
On MAVEN repository, on https://mvnrepository.com/artifact/com.querydsl/querydsl-jpa/4.2.1
it is indicated that querydsl-api depends of slf4j-api version 1.6.1.
When MAVEN build the application, which version of slf4j-api is used ?
When Java application is loaded, which version of slf4j-api is used ?
What happens if slf4j-api is defined before querydsl-jpa ?
What happens if slf4j-api version used in querydsl-jpa is lower than version defined in application POM file ?
This is all about Maven dependency mediation.
Maven builds a tree from your dependencies and consolidates this tree into a list. In this list, each dependency may appear only once. So if there are several different versions in your tree, Maven needs to choose one.
Maven has a "nearest dependency" standard rule that roughly states: The direct dependencies count more than first level transitive dependencies which count more than second level transitive dependencies and so on.
It is not possible to define a different rule, but you can specify a version in the <dependencyManagement> section of your pom. This version overwrites all transitively defined versions.
The hardest part is to figure out which version may be "right", i.e. compatible with all use cases. There is not automatic way to do that.
I am working on a Java project, using maven as our dependency manager/build tool. I am currently having a problem resolving a dependency's dependency to the correct version.
The dependency in question is called jasperreports-functions-6.1.0.jar which is not hosted in a maven repo but provided in jar form.
The problem I'm having is that jasperreports-functions needs commons-lang 2.6. Inconveniently, during "compile" Maven itself builds commons-lang 2.1 to create the reduced-pom. It seems this leads to jasperreports-functions trying to use commons-lang 2.1 because it is available, but this is not valid (method undefined errors at runtime.)
I have tried adding commons-lang 2.6 as a dependency but still it seems jasperreports-functions is using the 2.1 version.
pom.xml snip:
<dependency>
<groupId>net.sf.jasperreports</groupId>
<artifactId>jasperreports</artifactId>
<version>6.1.0</version>
</dependency>
<dependency>
<groupId>net.sf.jasperreports</groupId>
<artifactId>jasperreports-functions</artifactId>
<version>6.1.0</version>
<scope>system</scope>
<systemPath>${project.basedir}/jasperreports-functions-6.1.0.jar</systemPath>
</dependency>
<dependency>
<groupId>commons-lang</groupId>
<artifactId>commons-lang</artifactId>
<version>2.6</version>
</dependency>
Using "mvn dependency:tree" I can see that no dependency requires commons-lang.
If I delete 2.1 from ".m2\repository\commons-lang\commons-lang" it gets recreated by maven. If I empty the folder and lock the permissions on it, then run maven again I get the error:
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-jar-plugin:2.4:jar (default-jar) on project JavaLibrary: Execution default-jar of goal org.apache.maven.plugins:maven-jar-plugin:2.4:jar failed: Plugin org.apache.maven.plugins:maven-jar-plugin:2.4 or one of its dependencies could not be resolved: Failed to collect dependencies at org.apache.maven.plugins:maven-jar-plugin:jar:2.4 -> commons-lang:commons-lang:jar:2.1: Failed to read artifact descriptor for commons-lang:commons-lang:jar:2.1: Could not transfer artifact commons-lang:commons-lang:pom:2.1 from/to central (https://repo.maven.apache.org/maven2): C:\Users\Lowell\.m2\repository\commons-lang\commons-lang\2.1\commons-lang-2.1.pom.part.lock (Access is denied) -> [Help 1]
How can I force the jar dependency to use a certain version of a sub-dependency?
Have you tried to reorder the depency entries,
first to load commons-lang then to load jasperreports ?
Edit:
Maybe this should help you: dependency:analyze-dep-mgt
What you are doing should be enough. The newer version should override the older version AND the version you specify explicitly should override any transient dependency. I believe Maven 2.x had problems in this area which is why I updated to Maven 3.x
I suspect the problem is somewhere else. I suggest trying to delete common-lang 2.1 and I suspect this should show you what the real problem is.
Try this:
1> Maven clean.
2> Right click on project->maven -> update project configuration - > force update
I'm fairly new to the Eclipse and Maven2 worlds. I'm struggling to comprehend how to add a Maven project dependency on Apache Jena in a simple way. Specifically, I'd like to add a dependency such as
<dependency>
<groupId>org.apache.jena</groupId>
<artifactId>jena</artifactId>
<version>${jena.version}</version>
</dependency>
And this would automatically pull in the modules(eg. jena-arq, jena-core, etc). However, adding this dependency results in a Missing artifact org.apache.jena:jena:jar:2.11.1 error. If I add <type>pom</type> to the dependency the error is gone but I do not get the jars in my project.
In any event, as I understand it, POM is more suited to project <--modules dependencies and what I'm really looking for is project --> lib archive dependencies.
How do I establish such a relationship? I considered simply replicating the dependency for each module in Jena since it's using a property anyway. However, it is possible, and Jena is a prime example, that not all modules in a project share the same version. For example jena-core is on 2.11.1 where jena-tdb is on 1.0.1 however jena-2.11.1 encompasses jena-tdb.
Thanks
See http://jena.apache.org/download/maven.html for details.
In brief:
<dependency>
<groupId>org.apache.jena</groupId>
<artifactId>apache-jena-libs</artifactId>
<type>pom</type>
<version>2.11.1</version> <!-- Set version -->
</dependency>
Note that it is type pom.
there is not a easy way do this.
you must define every dependency jar with special version.
I am using Spring 3 and Hibernate 4 JPA. I am confused regarding javax.persistence JAR. I found below two Maven dependencies on Google. Please tell me which one is required in below two dependencies?
<dependency>
<groupId>javax.persistence</groupId>
<artifactId>persistence-api</artifactId>
<version>1.0.2</version>
</dependency>
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>javax.persistence</artifactId>
<version>2.0.0</version>
</dependency>
The first of those javax.persistence.persistence-api is the API Jar, which defines vendor-neutral interfaces which your application should be working with.
The second is the EclipseLink implementation of that API.
It is possible to remove references to the first javax.persistence dependency and just use the EclipseLink jar. However there is a good reason not to.
Writing and compiling your code against the vendor-neutral javax.persistence API ensures that your application code is portable to different persistence providers. For instance if you wished to switch to Hibernate, then you could put that in your pom.xml and remove the org.eclipse dependency, without changing any of your application code.
However, there's an extra little detail you should change. To ensure that your application can switch between persistence providers, the 'implementation' dependency should only be used at runtime. Otherwise, vendor-specific code could easily make its way into your codebase. Add the following to your org.eclipse dependency and see whether your application compiles.
<scope>runtime</scope>
As a result of that, you may find that your application has EclipseLink-specific code in it. This means that you could not change persistence provider without changing your codebase.
Whether that's a problem is up to you. ;)
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>javax.persistence</artifactId>
<version>2.0.0</version>
</dependency>
Which is the lastest one and compact with hibernate 4. Also latest version of hibernate support jpa 2.1.0 please check this link
You dont need to include that dependency explicitly, it is in Hibernate pom and will be added transitively