Maven Spring project not executing due to ClassNotFoundException - spring

I'm working on a Spring/Maven tutorial to test splitting up Spring bean definitions between multiple files. My issue is that mvn -X -e exec:java shows build failure, but running as a Java application within STS shows the proper output.
My project is set up as com.jason.basicOne, with com.jason as the groupId and basicOne as the artifactId. The only compiler warning within STS is due to an imported class not being used.
Things I've done:
Used the <import /> tags to reference the secondary files, and enabled the usage within Spring Properties.
Refreshed the project several times via mvn clean and mvn package
But the ClassNotFoundException still shows up for com.jason.App. What other things should I look for?
EDIT
I found the error. In my pom.xml, I use the exec-maven-plugin to enable execution via mvn exec:java on the command line. The plugin definition was set to a previous project, from which I cut and pasted to the new project. The updated package name was not included, which is why the project executed via STS and not command line.

Your example compiles correctly if you
1. check com.jason.App class. Should it read com.jason.basicOne.App instead?
2. see if your pom.xml has right spring jars.
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>3.0.3.RELEASE</version>
</dependency>
Make sure your ".m2/" does not have an old spring which is referenced by your pom.xml

Related

BiRT latest Runtime as one Maven Dependency for Eclipse

I have a given eclipse maven project which builds to a jar. The pom has one major dependency of BiRT 4.8.0-202010080643 Runtime.
<dependency>
<groupId>com.customer.birt.runtime</groupId>
<artifactId>org.eclipse.birt.runtime</artifactId>
<version>4.8.0-202010080643</version>
</dependency>
So they pushed the artifact into their own nexus; thats why com.customer.birt.runtime.
I really don't know how the guy did that and which tools he used. Currently I want to update to BiRT 4.9. Replacing the above with the only available:
<dependency>
<groupId>org.eclipse.birt</groupId>
<artifactId>birt-runtime</artifactId>
<version>4.9.0</version>
<type>pom</type>
</dependency
does not go well. Both are totally different constellations from the same big project. How can I make use of the above maven dependency of 4.9 in my simple birt project? I'm building only a service for a desktop application that is hosted and run within an RCP application. I started to list the individual maven deps so that the java compiles which I succeeded to but I still have few unit tests that execute and render ReportEngine and fail because of missing Deps at runtime. This is because the ReportEngine is loading APIs at runtime..
I started to post here once I noticed that I will be declaring the separate deps in pom.xml blindly which is (even if the Unittests pass) very unreliable..
Thank you so much!
M.Abdu
My solution was currently as I put in the comments or yet simpler. I just uploaded manually the birt-runtime jar into nexus using my account within the customer and then put in my pom the exact same unique coordinates groupid:artifactid:version. Plus some other dependencies depending of what my unit tests are asking at runtime, e.g. eclipse.platform, emf.core, w3c, batik.css etc.
I am talking about executing the build using mvn clean verify and resulting a jar file
The jar you get from here
https://search.maven.org/remotecontent?filepath=org/eclipse/birt/birt-runtime/4.9.0/birt-runtime-4.9.0.zip
pom in my case:
<dependency>
<groupId>org.eclipse.birt</groupId>
<artifactId>runtime</artifactId>
<version>4.9.0-20220502</version>
</dependency>

Import of jar in IntelliJ is successful and imports are resolved but mvn clean install and package fails

Some classes in my spring boot maven project were showing errors on some imports , so I had to add an external jar dependency in my IntellIJ (Community) . After adding it all the errors are gone , and i can see the jar is listed inside external libraries in IntelliJ . I try to run the spring boot project , works fine . But when i try to do a mvn clean install or mvn clean on the project directory , it fails showing import errors on the same classes for which purpose i had added the jar . I tried re-building the project , invalidating caches , but issue still remains the same . I am not able to understand if adding the JAR has resolved the import errors , and project also starts , why mvn phases are having failure as if no jar is added ?
In a Maven based project you must manage project build configuration, including dependency management in Maven pom.xml build files, not adding it via IDE interface. So you need to add the required dependencies using the Maven's dependency management mechanism, simply inside Maven dependencies section. e.g.
<dependencies>
...
<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<version>2.3.4.RELEASE</version>
</dependency>
...
</dependencies>
And by the way the IDE helps you with that.

Intellij Spring maven install error "package does not exist"

Intellij version : Community 2019.2.3
Maven : 3.6.2
Spring : 2.2.0
I am trying to create a very simple Spring maven project with two sub-modules (one independent and another one dependent on independent one).
Root module - testmultimodule
Independent module - independent
Dependent module - dependent
testmultimodule pom.xml has all Spring related declaration and module definition
<modules>
<module>independent</module>
<module>dependant</module>
</modules>
Independent poom.xml is simplest and . only has parent maven declaration
<parent>
<artifactId>testmultimodule</artifactId>
<groupId>in.org.app</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
dependent module pom.xml has the dependency declaration as below to independent module
<dependencies>
<dependency>
<groupId>in.org.app</groupId>
<artifactId>independent</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
</dependencies>
I have created a Test class under dependent module and using a User object from independent module. Initially, without the above dependency declaration, asa usual there was compilcation error.
As soon as I add the dependency and builld the project within Intellij IDE with the option "Build Prooject" option from "Build" menu, it successfully builds.
However, if I try to use Maven install option within Intellij right side window option. It always fails stating Error:(3,33) java: package in.org.app.independent.bo does not exist .
I am providing the GitHub URL for the test project , if you want to take a look and test by yourself.
GIT URL:
https://github.com/DhruboB/testmultimodule
I have tried all sort of tweaking found in internet so far e.g.
clearing Intellij Cache & restarting, mvn -U clean install, mvn scope verification, proxy etc.
Any further idea to resolve this? I need to solve this in the Community version of Intellij.
Your parent project includes the definition for the spring-boot-maven-plugin. This leads to each project defining this as a parent to be repacked to an executable JAR by this plugin. This repackaged JAR isn't useable as a dependency in another project.
Either you need to change the configuration of the spring-boot-maven-plugin for the project you want to use as a dependency. This is explained here in the Spring Boot Reference Guide. You now basically have 2 jars from this project, one plain and one executable.
If you don't need that project to be an executable JAR file then just move the spring-boot-maven-plugin to the project that needs to be. All other projects will no be basic JAR files again.
See also How to add a dependency to a Spring Boot Jar in another project?

How do I specify a JAR in a POM such that it is excluded from packaging but available when running from within IntelliJ?

I have a project where several dependency versions need to be chosen at deployment time - i.e. specified in the classpath.
The provided scope prevents the dependency being packaged but the project fails when I try to run from within IntelliJ IDEA
e.g.
<dependency>
<groupId>org.apache.activemq</groupId>
<artifactId>activemq-core</artifactId>
<version>5.3.1</version>
<scope>provided</scope>
</dependency>
produces
{stacktrace ...}
Caused by: java.lang.ClassNotFoundException: javax.jms.ConnectionFactory
If I remove the scope the project runs fine but, of course, includes the jar.
If you mark a jar as <provided>, the classes need to be provided by the container that runs the surrounding war/ear.
When you run your project from within IntelliJ, it is probably deployed on some kind of container. Make sure this container provides you <provided> dependencies.
Final approach was to create two maven profiles, one for running locally and one for packaging. The local profile used compile scope while the package profile used provided.

Maven 3 and JUnit 4 compilation problem: package org.junit does not exist

I am trying to build a simple Java project with Maven. In my pom-file I declare JUnit 4.8.2 as the only dependency. Still Maven insists on using JUnit version 3.8.1. How do I fix it?
The problem manifests itself in a compilation failure: "package org.junit does not exist". This is because of the import statement in my source code. The correct package name in JUnit 4.* is org.junit.* while in version 3.* it is junit.framework.*
I think I have found documentation on the root of the problem on http://maven.apache.org/plugins/maven-surefire-plugin/examples/junit.html but the advice there seems to be meant for Maven experts. I did not understand what to do.
Just to have an answer with the complete solution to help the visitors:
All you need to do is add the junit dependency to pom.xml. Don't forget the <scope>test</scope>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
#Dennis Roberts: You were absolutely right: My test class was located in src/main/java. Also the value of the "scope" element in the POM for JUnit was "test", although that is how it is supposed to be. The problem was that I had been sloppy when creating the test class in Eclipse, resulting in it being created in src/main/java insted of src/test/java. This became easier to see in Eclipse's Project Explorer view after running "mvn eclipse:eclipse", but your comment was what made me see it first. Thanks.
my problem was a line inside my pom.xml i had the line <sourceDirectory>${basedir}/src</sourceDirectory> removing this line made maven use regular structure folders which solves my issue
removing the scope tag in pom.xml for junit worked..
I had the same problem. All i did was - From the pom.xml file i deleted the dependency for junit 3.8 and added a new dependency for junit 4.8. Then i did maven clean and maven install. It did the trick. To verify , after maven install i went project->properties-build path->maven dependencies and saw that now the junit 3.8 jar is gone !, instead junit 4.8 jar is listed. cool!!. Now my test runs like a charm.. Hope this helps somehow..
Add this dependency to your pom.xml file:
http://mvnrepository.com/artifact/junit/junit-dep/4.8.2
<!-- https://mvnrepository.com/artifact/junit/junit-dep -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit-dep</artifactId>
<version>4.8.2</version>
</dependency>
I had my files at the correct places, and just removing <scope>test</scope> from the JUnit dependency entry solved the problem (I am using JUnit 4.12). I believe that with the test scope the dependency was just being ignored during the compilation phase. Now everything is working even when I call mvn test.
My case was a simple oversight.
I put the JUnit dependency declaration inside <dependencies> under the <dependencyManagement/> node instead of <project/> in the POM file. Correct way is:
<project>
<!-- Other elements -->
<dependencies>
<!-- Other dependencies-->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
</dependency>
</dependencies>
<project>
I had a quite similar problem in a "test-utils" project (adding features, rules and assertions to JUnit) child of a parent project injecting dependencies.
The class depending on the org.junit.rules package was in src/main/java.
So I added a dependency on junit without test scope and it solved the problem :
pom.xml of the test-util project :
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
</dependency>
pom.xml of the parent project :
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<scope>test</scope>
</dependency>
How did you declare the version?
<version>4.8.2</version>
Be aware of the meaning from this declaration explained here (see NOTES):
When declaring a "normal" version such as 3.8.2 for Junit, internally this is represented as "allow anything, but prefer 3.8.2." This means that when a conflict is detected, Maven is allowed to use the conflict algorithms to choose the best version. If you specify [3.8.2], it means that only 3.8.2 will be used and nothing else.
To force using the version 4.8.2 try
<version>[4.8.2]</version>
As you do not have any other dependencies in your project there shouldn't be any conflicts that cause your problem. The first declaration should work for you if you are able to get this version from a repository. Do you inherit dependencies from a parent pom?
Me too had the same problem as shown below.
To resolve the issue, below lines are added to dependencies section in the app level build.gradle.
compile 'junit:junit:4.12'
androidTestCompile 'com.android.support.test:runner:0.5'
Gradle build then reported following warning.
Warning:Conflict with dependency 'com.android.support:support-annotations'.
Resolved versions for app (25.1.0) and test app (23.1.1) differ.
See http://g.co/androidstudio/app-test-app-conflict for details.
To solve this warning, following section is added to the app level build.gradle.
configurations.all {
resolutionStrategy {
force 'com.android.support:support-annotations:23.1.1'
}
}
I had a similar problem of Eclipse compiling my code just fine but Maven failed when compiling the tests every time despite the fact JUnit was in my list of dependencies and the tests were in /src/test/java/.
In my case, I had the wrong version of JUnit in my list of dependencies. I wrote JUnit4 tests (with annotations) but had JUnit 3.8.x as my dependency. Between version 3.8.x and 4 of JUnit they changed the package name from junit.framework to org.junit which is why Maven still breaks compiling using a JUnit jar.
I'm still not entirely sure why Eclipse successfully compiled. It must have its own copy of JUnit4 somewhere in the classpath. Hope this alternative solution is useful to people. I reached this solution after following Arthur's link above.
I also ran into this issue - I was trying to pull in an object from a source and it was working in the test code but not the src code. To further test, I copied a block of code from the test and dropped it into the src code, then immediately removed the JUnit lines so I just had how the test was pulling in the object. Then suddenly my code wouldn't compile.
The issue was that when I dropped the code in, Eclipse helpfully resolved all the classes so I had JUnit calls coming from my src code, which was not proper. I should have noticed the warnings at the top about unused imports, but I neglected to see them.
Once I removed the unused JUnit imports in my src file, it all worked beautifully.
Find the one solution for this error if you have code in src/main/java Utils
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
<version>3.9.1</version>
</dependency>
Changing the junit version fixed this for me. Seems like version 3.8.1 didn't work in my case. Issue fixed upon changing it to 4.12
I met this problem, this is how I soloved it:
Context:
SpringBoot application
Use maven to manage multiple modules
Add junit's maven dependency in root POM's dependencyManagement(rather than dependencies, their differences can be found here)
Intend to test class or folder inside one of the root module's child module
PS: If your situation does not match the context above, this solution may not solve your problem.
Steps
right click at the class or folder you want to test:
Choose More Run/Debug -> Modify Run Configuration
Change the module option to the one you want to test from root module
By default , maven looks at these folders for java and test classes respectively -
src/main/java and src/test/java
When the src is specified with the test classes under source and the scope for junit dependency in pom.xml is mentioned as test - org.unit will not be found by maven.

Resources