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Project added in build path but eclipse showing project not exist

I have a project say A and I have another project B.
I am trying to use project B in project A and so I added project B in project A's build path specifically Classpath.
After adding the import, error got resolved from eclipse IDE but when I am doing mvn clean install there is a compilation error saying package com.examples does not exist.
I tried adding as external jars as well but still it is not working.
Project A is Spring boot project version 2.7.5.
Java version is 17.
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.568 s
[INFO] Finished at: 2022-10-23T14:48:00+02:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.10.1:compile (default-compile) on project proj: Compilation failure: Compilation failure:
[ERROR] /C:/Users/user/eclipse-workspace/proj/src/main/java/com/name/proj/Application.java:[6,30] package com.examples does not exist
Note: Both projects are running successfully independently.
Please help me to resolve this issue.

Angular7 + maven with IBM websphere error (frontend-maven-plugin:1.0:npm (npm install fail))

I have a complete angular7 project and want to integrate with java.
is there any way to do it?
I am using eclipse maven + ibm websphere. (not spring boot)
I referred this post(by #TimeTraveler) and tried to follow...
however when I run command mvn clean package, I encounter this error
[INFO] --- frontend-maven-plugin:1.0:npm (npm install) # angular7test ---
[INFO] Running 'npm install' in C:\Users\eclipse-workspace\angular7test\angular-project
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 02:01 min
[INFO] Finished at: 2018-11-29T23:16:03+08:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal com.github.eirslett:frontend-maven-plugin:1.0:npm (npm install) on project angular7test: Failed to run task: 'npm install' failed. java.io.IOException: Cannot run program "C:\Users\eclipse-workspace\angular7test\node_installation\node\node.exe" (in directory "C:\Users\eclipse-workspace\angular7test\angular-project"): CreateProcess error=267, The directory name is invalid -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException
and I also have a question .. based on that post, maven project looks like below
Maven Project -
src
main
java
resources
webapp
WEB-INF
web.xml
angular-project (I paste my angular project here)
node_installation ========>what is this?????
pom.xml
what is node_installation? .. is that a folder? do i need to create?
this is my package..

The error you posted indicates that Maven can't find the node.js executable node.exe in order to build your Angular project. Make sure you configure your pom as indicated on the frontend-maven-plugin readme page so that it will install node and npm into your project dir where maven expects to find it. This will create the node_installation directory you are missing and populate it with the node.exe executable, which should resolve the error.

Spring MVC tutorial project does not build on IntelliJ

I am trying to build and run a Spring MVC beginner lesson project using IntelliJ. I imported the existing project from GitHub. But when I try to build the project I keep getting:
Error:(3, 38) java: package org.springframework.stereotype does not exist
Error:(4, 47) java: package org.springframework.web.bind.annotation does not exist
These external dependencies jars are under my Maven local repositories (C:\Users\sudi.m2)and I can see in IntelliJ under Maven->Repositories that repo location is indeed there. I also tried "Invalidate Cache and restart" but that does not help. My M2_HOME is set correctly to C:\apache-maven-3.2.2. If I try to run mvn install from command line, I get:
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 40.845 s
[INFO] Finished at: 2014-09-25T19:03:21+05:30
[INFO] Final Memory: 9M/93M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-war-plugin:2.2:war (default-war) on project basic-web-app: Error assembling WAR: webxml attribute is required (or preexisting WEB-INF/web.xml if executing in update mode) -> [Help 1]
Any suggestions are appreciated.

If the project doesn't have a web.xml file (IE: Entirely java config based). The build war plugin will fail unless you specify the "failOnMissingWebXml" attribute to false.

Delete you local .m2 repository and let it re-download all needed jars. Maybe, there were issues while downloading one of the dependencies.

Unable to locate command maven in project with spring boot

I'm trying to setup a simple java rest service with spring boot and maven and I've downloaded maven and have my pom.xml located in the same folder as src so it's
src & pom.xml -> main -> java -> hello
when I'm inside the hello folder and try to run maven clean package to build my jar file it says command maven not found.
I'm still relatively new to java web dev so making sure everything is configured correctly is difficult for me. I've downloaded maven but do I need to have the actual maven files in my project?
Any help is truly appreciated.
-Adam
UPDATE:
[INFO] Scanning for projects...
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.124s
[INFO] Finished at: Fri Oct 04 11:47:08 PDT 2013
[INFO] Final Memory: 4M/89M
[INFO] ------------------------------------------------------------------------
[ERROR] The goal you specified requires a project to execute but there is no POM in this directory (/Users/adam419/Desktop/Programming/Java/dd-servlet/src). Please verify you invoked Maven from the correct directory. -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MissingProjectException
Edit:
[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR] /Users/adam419/Desktop/Programming/Java/dd-servlet/src/main/java/hello/GreetingController.java:[3,7] error: class Greeting is public, should be declared in a file named Greeting.java
[ERROR] /Users/adam419/Desktop/Programming/Java/dd- servlet/src/main/java/hello/Greeting.java:[3,7] error: duplicate class: hello.Greeting
[INFO] 2 errors

The pom.xml must be in the "root" folder.
/yourApp:
- pom.xml
- /src
- /main/java
...
- /test/java
...

Although you are making the mistake #Ralph has given in his answer, I don't think this mistake would give the error message you're getting. To me it sounds like you haven't installed maven correctly. The install steps are at the bottom of this page. Make sure you've followed the directions correctly.
The error you've added on says there's no pom at the directory you ran the command from. You need to run the command in the same directory that the "pom.xml" file is in.

Generating jar file using maven in db unit installation

I need to install db unit in my system. I have completed installing JDBC driver. i have downloaded junit-4.11.jar.
I have to generate the jar file into the directory.What is the correct method/step of doing this.AS per the link:
http://www.dbunit.org/building.html
i tried to run the command mvn from command line.
But i get the error
C:\Users\suvin>mvn install
[INFO] Scanning for projects...
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.225s
[INFO] Finished at: Tue Nov 20 14:51:56 IST 2012
[INFO] Final Memory: 1M/15M
[INFO] ------------------------------------------------------------------------
[ERROR] The goal you specified requires a project to execute but there is no POM
in this directory (C:\Users\suvin). Please verify you invoked Maven from the co
rrect directory. -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MissingProject
Exception
Any help would be appreciated

Is dbUnit dependency is included in the POM file, if so mvn install does what you are expecting it to do
<dependency>
<groupId>org.dbunit</groupId>
<artifactId>dbunit</artifactId>
<version>2.4.3</version>
</dependency>

it seems C:\Users\suvin location doesn't have pom file, Before execute "mvn install" your command prompt should be in place where your POM file exist.
For your information.
Normaly from a source codes you can build(compile) it and get your jars. To build a source codes you can use either ant or maven which are some build tools in java. Source codes providers provide their source codes with build.xml or pom.xml or both. You could use your build technology to compile that java source and get jar from it.
you can learn ant and maven from the web