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Maven connection to IDE

I am using Maven to use Postrgres SQL driver. Besides I am using InteliJ IDEA Ultimatre Edition, and, as I understood, Maven is included in Ultimate version initially. Correct me - all I need, is to set dependencies, and connect PostrgeSQL to Java. I am not oblige to Download Maven (except required Dependecie of course, I mean Maven as framework)? Thanks a lot!

When you are creating a new project, choose Maven. After the project is created, you will receive an empty Maven project structure with the pom.xml and a script mvnw of Maven Wrapper, which you can use (instead of mvn) to build your app.
Just add dependencies to the pom.xml and build.
The Maven Wrapper will do the work for you - download Maven into the project subdirectory and use it.

Add project repo for an edited jar in Eclipse Maven project

I have a legacy project that I'd like to convert to a Maven project for dependency management.
The problem is, that I have one jar (fop-1.1.jar) that I had to edit. It differs from the one that is publicly available and I only have it locally. But I need it this way.
What I tried to do, following several similar how-to's, it to create a fake Maven repo inside the project (local repo is no good, because several people work on that project and the solution has to be self-contained on Git) and reference this repo from the pom.xml. Sounds like the way to go for me, but it doesn't work. Eclipse show the project repo grayed-out :(
What am I missing?
BTW: this is what I tried to follow: https://devcenter.heroku.com/articles/local-maven-dependencies

Let me suggest another way: When we need to "edit" a jar, we give it a special version number like 1.1-edited instead of 1.1.. Then we can easily upload it to our normal Maven repository and use it. Maven even makes sure that you do not accidentally load both versions in the same project because the edit is only in the version number.

I guess what you need is a private maven server(I guess it exists), and then execute command to deploy jar( before deploy, check your account has privileges)
mvn deploy:deploy-file -Dfile=${jarFilePath} -DgroupId=${groupID} -DartifactId=${artifactId} -Dversion=${version} -Durl=${privateServerURL} -Dpackaging=jar -DrepositoryId=${privateServerURLInYourMavenSettings.xml}
,
after deploy successfully, add maven dependency
<dependency>
<groupId>${groupID}</groupId>
<artifactId>${artifactId}</artifactId>
<version>${version}</version>
</dependency>

Intellij can not resolve class of external library

Need a help !
I'm trying to connect spring security library to my project using Maven.
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-web</artifactId>
<version>4.2.3.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-config</artifactId>
<version>4.2.3.RELEASE</version>
</dependency>
Library org.springframework.security.core have been downloaded successfully.
But when i'm trying to extend my class(AuthorizedUser.class) from org.springframework.security.core.userdetails.User
Intellij says, that can not resolve it. But other classes and interfaces from: org.springframework.security.core.userdetails resolving well. See the link...
When i goes to external library tree and opened org.springframework.security.core.userdetails library i saw User.class like this See the link...
Please, if anyone knows something about this problem, I'll be very thankful for any information
Windows 7
Intellij IDEA version 2017.2.4 Ultimate
Java version 1.8.0_144
Maven version 3.5.0

Maybe, you just need to create a constructor matching with super class or first try to create a class property instead of extending it just for test. apidoc
if it does not help, probably it is not related to ide, it is possible maven could not resolve dependencies because of some misconfiguration.
You can try these:
1- check local maven repository and confirm right version of jar files are there.
c:\users{username}.m2\repository\org\springframework\security
2- try build from commandline with following command and confirm build finish succesfully
mvn clean install
3- Try reimport all maven project
4 - Also, confirm intellij use right maven version, repository and settings xml. You can write "maven settings" on search bar, ant it will lead you to maven settings page.
if you find any of them is not as expected, let me know so I will try to help.

What is the best way of adding a jar file to a maven project if we could not find it the maven central repository?

I need to add the package "uk.ac.shef.wit.simmetrics.similaritymetrics"
to my maven project but I am not able to find any remote repository which contains it. I have to add it via dependency to the project, but not successful yet.
-I already added the jar file to the referenced library but in that wat I get the following error:
package uk.ac.shef.wit.simmetrics.similaritymetrics does not exist.
-Adding it through following dependency to the Pom.xml also does not help
<dependency>
<groupId>uk.ac.shef.wit</groupId>
<artifactId>simmetrics</artifactId>
version>1.6.2</version>
<scope>system</scope>
<systemPath>LocalPath\simmetrics-1.6.2.jar</systemPath>
</dependency>
Any help is appreciated!!

If this is a small project that you intend to only build locally or on a few machines then the simplest way is follow directions at the site below to add a 3rd party jar. Those instructions will help you install it in your local repository. You will need to do that for all machines that you intend to run the build on.
https://maven.apache.org/guides/mini/guide-3rd-party-jars-local.html
If you plan to run it on many machines then the best thing to do is to install the artifact to your own private repository. If that is the case then I suggest you create a project for it in version control. Then upload the file as part of that project.

I appear to be the current maintainer of Simmetrics. You can add this dependency to your pom file.
<dependency>
<groupId>com.github.mpkorstanje</groupId>
<artifactId>simmetrics-core</artifactId>
<version>4.0.1</version>
</dependency>
Simmetrics has been given a much needed serious overhaul since 1.6.2. You may have to adjust your code accordingly. For source code and documentation see https://github.com/Simmetrics/simmetrics

Maven not downloading dependencies in Eclipse

I am setting up a project in eclipse . This projects builds successfully through command line(all mvn commands like mvn package, mvn compile, mvn clean install) work perfectly fine. While setting up this project on STS or Eclipse . I see some of the dependencies are not getting downloaded even though they are present in pom.xml. However, searching them in the maven repository and downloading the jar to my local computer and then adding them to build path makes it work on Eclipse.
Is there anything that we need to do to eclipse to make sure it downloads all the dependencies from the repository.
My POM:
<dependency>
<groupId>org.apache.bookkeeper</groupId>
<artifactId>bookkeeper-server-compat410</artifactId>
<version>4.1.0</version>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.apache.bookkeeper</groupId>
<artifactId>bookkeeper-server</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.apache.bookkeeper</groupId>
<artifactId>bookkeeper-server-compat420</artifactId>
<version>4.2.0</version>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.apache.bookkeeper</groupId>
<artifactId>bookkeeper-server</artifactId>
</exclusion>
</exclusions>
</dependency>
Both these artifacts were not downloaded for eclipse and there jars found http://mvnrepository.com/artifact/org.apache.bookkeeper/bookkeeper-server-compat410/4.1.0 and http://mvnrepository.com/artifact/org.apache.bookkeeper/bookkeeper-server-compat420/4.2.0 were not present in the folder for MavenDependencies and were subsequently giving errors in Eclipse.
However manually adding them to the build path created a new folder (Reference Library) and resolved the Eclipse Errors . Why did Eclipse not download and import these dependencies by themselves from the maven repository ?? Is it a bug in Eclipse or some problem from my side . Please help.

I got the same problem and this is how i solved. :
Right click your project, choose Run As -> Maven install.
Observe the output console to see the installation progress. After
the installation is finished, you can continue to the next step.
Right click your Spring MVC project, choose Maven -> Update Project.
Choose your project and click OK. Wait until update process is
finished.
The error still yet, then do Project->Clean and then be sure you have selected our project directory and then do the follow Project->Build.

Solution 1:
Set correct proxy:
<proxy>
<id>optional</id>
<active>false</active>
<protocol>http</protocol>
<username></username>
<password></password>
<host>172.27.171.91</host>
<port>8080</port>
</proxy>
Solution2 :
just delete
lastupdated extension files from folder
and try updating maven.
[Most of the times this solution will work]

Sometimes there is an error downloading a dependency - eg. some files are downloaded but the actual JAR is missing from the local Maven repository.
In this case I had to delete the whole folder of the problematic dependency in the local maven repository. Only then did Maven update work (Right-click on the project and select Project > Maven > Update Project.... )

In my case, I had unchecked Build automatically. Checking it again started downloading the jars.

I have come across the same issue recently.
First of all you have to configure proxy settings in settings.xml in your maven repository.
If you are using eclipse/STS then please do verify following.
Window -> Preferences -> Maven -> User Settings -> update user settings by pointing your settings.xml
Now it's set to update the maven project. It worked for me.

I was facing similar sort of issue. I tried deleting folders inside .m2 and again building maven project.
I could download all dependency except one dependency which we have created by ourselves and published on Nexus.
Then I changed by java pointing from JRE to JDK which solved my problem

The following worked for me.
Just right-click on Project -> Maven -> Update Project... such as it is shown here.

I had faced a similar issue and following the below steps helped me fix it.
Delete the last modified jar from respective folders.
Select the project
Right Click -> Maven
Update project..
It will download all the missing Jars.

Try to move your dependencies from "type" tag to "scope" tag like below
or
<dependency>
<groupId>net.xyz.xyz</groupId>
<artifactId>xyz-xyz</artifactId>
<version>x.y.z</version>
<type>pom</type>
</dependency>
or
<dependency>
<groupId>net.xyz.xyz</groupId>
<artifactId>xyz-xyz</artifactId>
<version>x.y.z</version>
<scope>test</scope>
</dependency>
then further Maven > Update Project

For me I changed the packaging from pom to jar, and then the dependency got downloaded.
so I changed from <packaging>pom</packaging> to <packaging>jar</packaging>

Make sure you're defining the dependency as close as possible to the leaf of the project tree where it is needed. Otherwise, Maven might ignore it.
For example, if you have a parent project that references projects A and B and the dependency is with respect to project A, then defining the dependency in the parent's pom.xml might get ignored by Maven. So, define it in project A's pom.xml.
Parent Project's pom.xml
Sub-project A's pom.xml <<< define the dependency where it is needed
Sub-project B's pom.xml

I hope this helps someone as it took me 2 days to realize. I re-imported the project multiple times and followed every possible step I've seen online and in the end I had added a small piece of xml code within the pom.xml. Even though it wasn't erroring or even showing a warning it was preventing maven from reading the lifecycle-mappings.
Click into your pom.xml and go to the dependencies tab on the bottom left, if you see an error there it's likely your pom.xml is corrupted in some way and maven will never attempt to download the dependencies even though you won't get any real error. I had looked back at a previous PR and noticed where/what I added and removed it and was able to get maven to work.