I am very new to Neo4j and I want to get started with an embedded Neo4j in a Java Application.
I try to create an HelloWorld Application like the following:
https://neo4j.com/docs/java-reference/current/#tutorials-java-embedded
You can find the source code here:
https://github.com/neo4j/neo4j/blob/3.1/manual/embedded-examples/src/main/java/org/neo4j/examples/EmbeddedNeo4j.java
I created a new maven project and added org.neo4j:neo4j 3.0.3 as a dependency. Unfortunately I cannot import "org.neo4j.graphdb.factory.GraphDatabaseFactory", all other imports seem to be ok.
Now I figured out, that the import is working for version "3.1.0-SNAPSHOT" of the neo4j dependency.
Here you can find the relevant part of my pom-file:
<dependencies>
<dependency>
<groupId>org.neo4j</groupId>
<artifactId>neo4j</artifactId>
<version>3.1.0-SNAPSHOT</version>
</dependency>
</dependencies>
Because I want to use a stable version, I want to achieve this with version 3.0.3 as well, but I cannot find something that this factory is depending on this version or how you should do it at version 3.0.3. Can somebody provide information about this?
The dependency you should include in your pom.xml is
<dependency>
<groupId>org.neo4j</groupId>
<artifactId>neo4j</artifactId>
<version>3.0.3</version>
</dependency>
As I see you already included the right dependency. Then I guess something went wrong during the resolving. Therefore purge your local repository and resolve the dependency again with following command
mvn dependency:purge-local-repository -Dinclude=org.neo4j:neo4j
If it's still not working you have to check if you are resolving the artifact from the maven central repository or somewhere else.
Related
I want to install processing via maven in intellij. I have added the following to my POM file:
<dependencies>
<dependency>
<groupId>org.processing</groupId>
<artifactId>processing-complete</artifactId>
<version>3.3.7</version>
</dependency>
</dependencies>
When trying to build, it says Cannot resolve org.processing:processing-complete:3.3.7
However, the file is definitely there in the repository: https://repo.maven.apache.org/maven2/org/processing/processing-complete/3.3.7/
anyone has any idea how to successfully build the complete processing library using maven or gradle?
PS. I am a huge noob with maven, so it might be something simple, but I've tried a bunch of stuff and nothing seems to work.
Edited to have the maven log: from mvn -X dependency:sources
https://gist.github.com/jurrejelle/91b59785c7a3184e776f0a1797c416f4
Your dependency section is asking for a jar file (the default type), which isn't present in the artifact. If you look on Maven Central, you can see that the given dependency tag includes a pom type tag:
<dependency>
<groupId>org.processing</groupId>
<artifactId>processing-complete</artifactId>
<version>3.3.7</version>
<type>pom</type>
</dependency>
I was able to reproduce your error using the XML you posted, and adding <type>pom</type> in my pom.xml cleared up the error for me.
I am moving some test code from an older jHipster project to a new one. The old project uses the org.springframework.cloud.netflix.zuul library, specifically org.springframework.cloud:spring-cloud-netflix-core:1.3.0.RELEASE .
I put the below in my new project's pom.xml:
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-zuul</artifactId>
<version>1.3.0.RELEASE</version>
</dependency>
However, it seems to be pulling in org.springframework.boot:spring-boot:2.2.5.RELEASE. This release does not contain zuul in it however, as this code fails import org.springframework.cloud.netflix.zuul.
Does anyone know a fix or workaround?
Old library.
org.springframework.cloud:spring-cloud-netflix-core:1.3.0.RELEASE
My new project is using
org.springframework.boot:spring-boot:2.2.5.RELEASE
UPDATE:
Sorry I updated my question - my pom file already has this code. But it is very weird to me that even though I put to 1.3.0, I can see in my maven dependencies that it's pulling in 2.2.5. Also when I right click my project, I see maven - reimport and maven - generate sources etc.. I don't see a update project. And clicking both of those doesn't seem to downgrade it to 1.3.0
If you update your pom.xml file your problem would solve.
In your pom.xml file you'll see dependencies tag you need to add the library you want and then right click your project and say maven -> update project
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-netflix-core</artifactId>
<version>1.3.0.RELEASE</version>
</dependency>
</dependencies>
Add following dependency to your pom.xml
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-zuul</artifactId>
<version>2.1.3.RELEASE</version>
</dependency>
Upgrading spring-boot to >= 2.5 requires some extra configuration in order for Zuul to keep working, see:
https://gist.github.com/aldobongio/6a22f49863c7a777612f7887bbb8fd1d
The dependency version I want to use is 4.5.0 as specified in my pom.xml
<dependency>
<groupId>net.java.dev.jna</groupId>
<artifactId>jna</artifactId>
<version>4.5.0</version>
</dependency>
<dependency>
<groupId>net.java.dev.jna</groupId>
<artifactId>jna-platform</artifactId>
<version>4.5.0</version>
</dependency>
However, when I run mvn clean install -DskipTest=true. Maven will download and use version 4.2.2.
libraries
I tried searching in the entire project thinking maybe there are other files(in this case pom.xml) that specify the version to 4.2.2 but found nothing.
Has anybody encountered this issue before? I'm new to Java and I can't think of any other reason as to why this is happening.
Look at the output of mvn dependency:list. It will list you all dependencies of the project with their respective versions.
This is the truth. If your Eclipse or IntelliJ or whatever list something else, they are most certainly wrong/outdated.
I like to build (mvn clean install) the picketlink example on
https://github.com/picketlink/TODO
But it wont work because the dependency picketlink-extension 3.0.0 isnt available in any repository.
Can anyone give me a hint what im doing wrong?
You could try to change
<dependency>
<groupId>org.picketlink.extensions</groupId>
<artifactId>picketlink-extensions-core</artifactId>
<version>3.0.0-SNAPSHOT</version>
</dependency>
to
<dependency>
<groupId>org.picketlink.extensions</groupId>
<artifactId>picketlink-extensions-core</artifactId>
<version>3.0.0-2013Feb08</version>
</dependency>
or anything newer from Maven Repository
I am new to Maven and am trying to set up one of my first POMs. My application will cache using EhCache. Going to Maven Central Repo (link here) I copy-n-pasted the <dependency> tag and copy it into my pom.xml like so:
...many dependencies above this point
<dependency>
<scope>compile</scope>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>4.0.1.Final</version>
</dependency>
<dependency>
<scope>compile</scope>
<groupId>net.sf.ehcache</groupId>
<artifactId>ehcache</artifactId>
<version>2.5.0</version>
</dependency>
<dependency>
<scope>compile</scope>
<groupId>jasperreports</groupId>
<artifactId>jasperreports</artifactId>
<version>3.5.3</version>
</dependency>
...many dependencies below this point
When I save the changes, Eclipse builds the workspace and gives me an error on the opening <dependency> tag for EhCache 2.5:
Missing artifact net.sf.ehcache:ehcache:jar:2.5.0
So I figured that perhaps v.2.5.0 has something wrong with it, and repeated the same for 2.4.7 (the last 2.4.x release before 2.5.0). Same deal.
Since I'm so new to Maven, I don't even know where to begin looking. I tried Project >> Clean and even restarted Eclipse to see if it was just a typical Eclipse "quirk". Nope.
I am thinking:
Could EhCache be publishing bad JARs to the Maven repo?
Could Maven Repo have something wrong with it?
Could this be due to something else configured wrong in my pom.xml?
Could this be a "JAR hell" issue where I have a conflict somewhere on my dependency graph?
How would SO start tackling this problem? Thanks in advance!
It is usually safer to refer to search.maven.org. Dependency from there:
<dependency>
<groupId>net.sf.ehcache</groupId>
<artifactId>ehcache</artifactId>
<version>2.5.0</version>
<type>pom</type>
</dependency>
Mind type pom. From module's pom:
This is a pom artifact to pull in ehcache-core and ehcache-terracotta
for clustering. Make sure to set 'type' to 'pom' in your dependency.
Aparently when someone does not need terracotta, ehcache-core will do perfectly fine as other answer states.
They use ehcache-core in the official documentation. Maven Central does not have a jar artifact for ehcache 2.5 which explains your error message.
Using ehcache-core changes the dependency to:
<dependency>
<groupId>net.sf.ehcache</groupId>
<artifactId>ehcache-core</artifactId>
<version>2.5.0</version>
</dependency>
Which successfully downloads on my machine (ehcache does not).
I dropped this into IntelliJ and it found it. I suspect there is something wrong with your settings. Try creating a project with only this dependency in it. If it fails to download, I would check your setting. e.g. .m2/settings.xml Are you using a Nexus server or maven proxy/cache?
BTW: A simpler way to search for JARs is to use http://mvnrepository.com/ which will find all the available versions and show you the XML you need to add.