I have created a project in java and compiled it as a jar with the mvn clean install command. The jar is in my local .m2 folder. I am trying to import it as a dependency in a new project. The jar is successfully imported into my new project but I cannot access any classes or methods in that jar.
<dependency>
<groupId>com.test</groupId>
<artifactId>rest-methods</artifactId>
<version>1.0-SNAPSHOT</version>
<scope>compile</scope>
</dependency>
This my custom maven dependency imported in my External Libraries
And this is when I try to use these class and any method inside it in my project:
When I try to add the maven dependency manually I can find it and I can click add but nothing happens
Am I missing some steps for using this class in my project? I am working on a Ubuntu 20.04 operating system
UPDATE: After looking in the Project Structure -> Project Settings -> Libraries I see that several files from the jar are marked as excluded (sources and JavaDocs):
Did they not get build properly when I created the jar ?
Related
I need to use BaseDetectorTest provided from one of Spotbugs extension library
I added the maven dependency from (FindBugs Test Utility)
But it does not include the BaseDetectorTest class file (Once Maven is updated, the jar file is added to the external libraries - but not the class file).
I am wondering why it happens.
My guess is "the Jar file provided by the repository is still being developed"
Could you teach me how to fix it?
find-sec-bugs/findsecbugs-test-util/src/test/java/com/h3xstream/findbugs/test/BaseDetectorTest.java is a test class. .../src/test/... and ...Test.java are indicators for that. Test classes aren't included in a project's JAR (by the jar:jar goal of the Maven JAR Plugin which is the default binding for the package phase) but in a project's ...-tests.jar which is created by the jar:test-jar goal.
On MvnRepository select a version tag, e.g. 1.9.0, then Files jar (2 KB) View All to find the ...-tests.jar. Use it with:
<dependency>
<groupId>com.h3xstream.findsecbugs</groupId>
<artifactId>findbugs-test-util</artifactId>
<version>1.9.0</version>
<classifier>tests</classifier>
</dependency>
On Maven Central you can get a later version (1.11.0), select it and then Browse 📁 to find it. Use it with:
<dependency>
<groupId>com.h3xstream.findsecbugs</groupId>
<artifactId>findsecbugs-test-util</artifactId>
<version>1.11.0</version>
<classifier>tests</classifier>
</dependency>
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 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?
I'm working on a recommender system using Apache Flink. The implementation is running when I test it in IntelliJ, but I would like now to go on a cluster. I also built a jar file and tested it locally to see if all was working but I encountered a problem.
java.lang.NoClassDefFoundError: org/apache/flink/ml/common/FlinkMLTools$
As we can see, the class FlinkMLTools used in my code isn't found during the running of the jar.
I built this jar with Maven 3.3.3 with mvn clean install and I'm using the version 0.9.0 of Flink.
First Trail
The fact is that my global project contains other projects (and this recommender is one of the sub-project). In that way, I have to launch the mvn clean install in the folder of the right project, otherwise Maven always builds a jar of an other project (and I don't understand why). So I'm wondering if there could be a way to say explicitly to maven to build one specific project of the global project. Indeed, perhaps the path to FlinkMLTools is contained in a link present in the pom.xml file of the global project.
Any other ideas?
The problem is that Flink's binary distribution does not contain the libraries (flink-ml, gelly, etc.). This means that you either have to ship the library jar files with your job jar or that you have to copy them manually to your cluster. I strongly recommend the first option.
Building a fat-jar to include library jars
The easiest way to build a fat jar which does not contain unnecessary jars is to use Flink's quickstart archetype to set up the project's pom.
mvn archetype:generate -DarchetypeGroupId=org.apache.flink \
-DarchetypeArtifactId=flink-quickstart-scala -DarchetypeVersion=0.9.0
will create the structure for a Flink project using the Scala API. The generated pom file will have the following dependencies.
<dependencies>
<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-scala</artifactId>
<version>0.9.0</version>
</dependency>
<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-streaming-scala</artifactId>
<version>0.9.0</version>
</dependency>
<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-clients</artifactId>
<version>0.9.0</version>
</dependency>
</dependencies>
You can remove flink-streaming-scala and instead you insert the following dependency tag in order to include Flink's machine learning library.
<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-ml</artifactId>
<version>0.9.0</version>
</dependency>
When you know build the job jar with mvn package, the generated jar should contain the flink-ml jar and all of its transitive dependencies.
Copying the library jars manually to the cluster
Flink includes all jars which are located in the <FLINK_ROOT_DIR>/lib folder in the classpath of the executed jobs. Thus, in order to use Flink's machine learning library you have to put the flink-ml jar and all needed transitive dependencies into the /lib folder. This is rather tricky, since you have to figure out which transitive dependencies are actually needed by your algorithm and, consequently, you will often end up copying all transitive dependencies.
How to build a specific sub-module with maven
In order to build a specific sub-module X from your parent project you can use the following command:
mvn clean package -pl X -am
-pl allows you to specify which sub-modules you want to build and -am tells maven to also build other required sub-modules. It is also described here.
In cluster mode, Flink does not put all library JAR files into the classpath of its workers. When executing the program locally in IntelliJ all required dependencies are in the classpath, but not when executing on a cluster.
You have two options:
copy the FlinkML Jar file into the lib folder of all Flink TaskManager
Build a fat Jar file for you application that includes the FLinkML dependencies.
See the Cluster Execution Documentation for details.
I have a maven project B which is packaged as a war B.war and has a 'local' dependency A.jar. The pom for building A.jar has a dependency on restFB and it resolves properly while compiling.
<dependency>
<groupId>com.restfb</groupId>
<artifactId>restfb</artifactId>
<version>${com.restfb-version}</version>
</dependency>
However when I package B.war, restFB's jar is not present in the WEB-INF/lib directory of B.war and execution throws NoClassDefFoundError. What is also baffling is that I find this happening only when I build it on an AWS Amazon Linux and not while building on Ubuntu. There are similar questions in SO which suggest adding
<packaging>war</packaging>
which I already have but doesn't seem to solve the problem. Any ideas how to solve this?
It should be simple to understand, that you might have invoke locally under Ubuntu
mvn install
for A. Therefore it is in the local .m2 repository.
Did AWS Amazon Linux also have this artifact in its repository? If not, copy it there and try to package again.
Also you explicitly include and exclude certain artifacts within the build configuration for maven-war-plugin