Develop Reference

How to run maven spring core project in CLI?

I have converted a spring project from Ant to Maven which has to be executed from Command Line as it required args in main method,
dependencies in pom.xml mentioned below
<properties>
<org.springframework.version>2.5.5</org.springframework.version>
<maven.compiler.source>8</maven.compiler.source>
<maven.compiler.target>8</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${org.springframework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>${org.springframework.version}</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.6</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>xerces</groupId>
<artifactId>xerces</artifactId>
<version>2.4.0</version>
</dependency>
<dependency>
<groupId>com.ibm.mq</groupId>
<artifactId>com.ibm.mq.allclient</artifactId>
<version>9.2.2.0</version>
</dependency>
</dependencies>
Previously it was created by Ant build, hence libraries are imported in lib folder and if we look at the final-project jar after build, we could see all the necessary jars would be present in that main Jar (myApp.jar) file, so I could execute that jar using java -jar myApp.jar and it worked well!
But in Maven, we have defied all the dependencies in pom.xml and after clean & build done, if I run my myApp.jar using the same command, it is saying below issues
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.NoClassDefFoundError: com/ibm/mq/MQException
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
at java.lang.Class.privateGetMethodRecursive(Class.java:3048)
at java.lang.Class.getMethod0(Class.java:3018)
at java.lang.Class.getMethod(Class.java:1784)
at sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:544)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:526)
Caused by: java.lang.ClassNotFoundException: com.ibm.mq.MQException
at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 7 more
Because those dependency jars are not present in myApp.jar, So, Is there anyway I can run my program? or I cannot go with Maven build tool for CLI kind of project since dependency jars wont be available in our main .jar?

ClassNotFound Exception when using jenkins and maven

I need your help. I'm just getting used to Java and have finished my first milestone in my private project. Now I wanted to use this milestone as an opportunity to deal with Jenkins and CI.
However, I run into problems when running the program via Maven in Jenkins. Maven always throws me a ClassNotFound exception when processing the Jenkins pipeline. But when I start the program locally in IntelliJ it runs without problems.
As far as I can see he can't find a POJO which I use for parsing XML using JAXB.
Why doesn't it find a class when I build using Jenkins but finds everything when I work locally, the POM is the same.
This is my POM:
<groupId>groupId</groupId>
<artifactId>rss_backend</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<maven.compiler.source>11</maven.compiler.source>
<maven.compiler.target>11</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.12</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.xml.bind</groupId>
<artifactId>jaxb-api</artifactId>
<version>2.2.11</version>
</dependency>
<dependency>
<groupId>com.sun.xml.bind</groupId>
<artifactId>jaxb-impl</artifactId>
<version>2.2.11</version>
</dependency>
<dependency>
<groupId>com.sun.xml.bind</groupId>
<artifactId>jaxb-core</artifactId>
<version>2.2.11</version>
</dependency>
<dependency>
<groupId>javax.activation</groupId>
<artifactId>activation</artifactId>
<version>1.1.1</version>
</dependency>
<dependency>
<groupId>dev.morphia.morphia</groupId>
<artifactId>core</artifactId>
<version>1.5.8</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<!-- Build an executable JAR -->
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>3.0.2</version>
<configuration>
<archive>
<manifest>
<mainClass>projects.rss_backend.MainApp</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
</plugins>
</build>
and this is the error i get when using jenkins/maven:
The following command runs and outputs the execution of your Java
application (which Jenkins built using Maven) to the Jenkins UI.
+ java -jar target/rss_backend-1.0-SNAPSHOT.jar
Exception in thread "main" java.lang.NoClassDefFoundError: javax/xml/bind/JAXBException
at projects.rss_backend.MainApp.main(MainApp.java:20)
Caused by: java.lang.ClassNotFoundException: javax.xml.bind.JAXBException
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
... 1 more```
Do you have a clue what I'm doing wrong or how I can fix the problem?

Normal jars do not contain dependencies.
You need to build an executable jar as described here: How can I create an executable JAR with dependencies using Maven?
Probably you did not start the jar from IntelliJ with java -jar but with some IntelliJ mechanism that did the magic (i.e. the classpath) for you.

I would suggest to upgrade your jaxb deps: The following are working for me in JDK11+:
<dependency>
<groupId>com.sun.xml.bind</groupId>
<artifactId>jaxb-impl</artifactId>
<version>2.4.0-b180830.0438</version>
</dependency>
<dependency>
<groupId>javax.xml.bind</groupId>
<artifactId>jaxb-api</artifactId>
<version>2.4.0-b180830.0359</version>
</dependency>
<dependency>
<groupId>org.glassfish.jaxb</groupId>
<artifactId>jaxb-runtime</artifactId>
<version>2.4.0-b180830.0438</version>
</dependency>

As far as I can see, you are using Java 11, which means modules exist.
Did you declare your own module (create a module-info.java in your source folder)?
Most cases above Java 8 where I have seen a ClassNotFoundException, there was a module dependency missing. And that means that you cannot interact with whatever you are trying to do.
I am not familiar with Jenkins, however I assume that either
- your project requires something from Jenkins
or
- Jenkins tries to interact with something from your project via Reflection (e.g. building an object from a database).
In the first case, in your module-info.java, you would write
requires (transitive) jenkins-module-you-want-to-add ;
in the second case you would write
opens your-data-package to jenkins-module-that-needs-access ;
That is in my opinion the most likely source of the ClassNotFoundException you are receiving.
Anyhow, there is also the chance that maven is the source of your problem.

how to fix "java.lang.NoClassDefFoundError: org/slf4j/LoggerFactory" error when run java jar application

we are using eclipse+spring tool suite to build java application, we can start the application in eclipse IDE, but if we export as jar with all dependency jars, and run it on linux machine. we always gets error as following:
Exception in thread "main" java.lang.NoClassDefFoundError: org/slf4j/LoggerFactory
at com.ctrip.framework.apollo.demo.api.SimpleApolloConfigDemo.<clinit>(SimpleApolloConfigDemo.java:22)
Caused by: java.lang.ClassNotFoundException: org.slf4j.LoggerFactory
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
here is our POM.xml below:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>apollo</artifactId>
<groupId>com.ctrip.framework.apollo</groupId>
<version>1.3.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>apollo-demo</artifactId>
<name>Apollo Demo</name>
<packaging>jar</packaging>
<properties>
<java.version>1.7</java.version>
<github.path>${project.artifactId}</github.path>
</properties>
<dependencies>
<dependency>
<groupId>com.ctrip.framework.apollo</groupId>
<artifactId>apollo-client</artifactId>
<version>${project.version}</version>
</dependency>
<!-- for spring demo -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
</dependency>
<!-- for spring boot demo -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-logging</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-log4j2</artifactId>
</dependency>
<!-- for refresh scope demo -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-context</artifactId>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-api</artifactId>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-slf4j-impl</artifactId>
</dependency>
<!-- take over jcl -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>jcl-over-slf4j</artifactId>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.7.25</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.25</version>
</dependency>
</dependencies>
</project>
2.1 we already included slf4j-log4j12 and slf4j-api as depdency.
2.2 the application can run normally in eclipse IDE window.
2.3 if we export executable jar including all dependencies, and ship jar on linux machine, run the jar file will get the above error.
2.4 we also checked generated jar package on windows with winRAR, the slf4j and log4j* jar package were there, see picture below.
we have struggled this for half day, but did not get any progress. Hope each expert can share with us some light or any suggestions. really appreciated!!!

You need to tell maven to compile the dependencys like this, the jars are compiled but you need the src in youre jar and not the jars in there:
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>3.0.0</version>
<configuration>
</configuration>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
and dependencys normaly have a <scope>compile</scope> tag, to tell the compile that they are needed at runtime

I've faced a similar problem few days ago, right I add the jar libraries but the core (scripts/classes) of the jar file are no included due some reason I was able to solve that problem by right click on the jar file go to properties and set the class path for the classes of that jar folder.
if you wanna check that the jar file has no class Def inside it explore the jar file from the explorer and double click on any class you'll see a page showing up and says there's no script for this class and it asks you to set the class path.
Another approach I tried which also worked for me is I've imported the same jar files on netbeans and they worked 100%

Spring 4 : Java 8 compatibility

I am trying to run a spring+hibernate project with java 8. But facing this issue
I checked that it is caused if we are using spring 3.* with java 8. But as i am using spring 4.* with java 8 so it should not occurs
Exception in thread "main" org.springframework.beans.factory.BeanDefinitionStoreException: Unexpected exception parsing XML document from class path resource [spring/config/BeanLocations.xml]; nested exception is java.lang.IllegalStateException: Context namespace element 'component-scan' and its parser class [org.springframework.context.annotation.ComponentScanBeanDefinitionParser] are only available on JDK 1.5 and higher
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:420)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:342)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:310)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:143)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:178)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:149)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:212)
at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:113)
at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:80)
at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:123)
at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:422)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:352)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
at com.mkyong.common.App.main(App.java:13)
Caused by: java.lang.IllegalStateException: Context namespace element 'component-scan' and its parser class [org.springframework.context.annotation.ComponentScanBeanDefinitionParser] are only available on JDK 1.5 and higher
at org.springframework.context.config.ContextNamespaceHandler$1.parse(ContextNamespaceHandler.java:65)
at org.springframework.beans.factory.xml.NamespaceHandlerSupport.parse(NamespaceHandlerSupport.java:69)
at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1297)
at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1287)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:135)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.registerBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:92)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.registerBeanDefinitions(XmlBeanDefinitionReader.java:507)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:398)
... 14 more
pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.mkyong.common</groupId>
<artifactId>SpringExample</artifactId>
<packaging>jar</packaging>
<version>1.0-SNAPSHOT</version>
<name>SpringExample</name>
<url>http://maven.apache.org</url>
<repositories>
<repository>
<id>JBoss repository</id>
<url>http://repository.jboss.com/maven2/</url>
</repository>
</repositories>
<properties>
<springframework.version>4.0.6.RELEASE</springframework.version>
<hibernate.version>4.3.6.Final</hibernate.version>
<mysql.connector.version>5.1.31</mysql.connector.version>
<joda-time.version>2.3</joda-time.version>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<!-- Spring -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${springframework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${springframework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>${springframework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>${springframework.version}</version>
</dependency>
<!-- Hibernate -->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>${hibernate.version}</version>
</dependency>
<!-- MySQL -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>${mysql.connector.version}</version>
</dependency>
<!-- Joda-Time -->
<dependency>
<groupId>joda-time</groupId>
<artifactId>joda-time</artifactId>
<version>${joda-time.version}</version>
</dependency>
<!-- To map JodaTime with database type -->
<dependency>
<groupId>org.jadira.usertype</groupId>
<artifactId>usertype.core</artifactId>
<version>3.0.0.CR1</version>
</dependency>
</dependencies>
<build>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.2</version>
<configuration>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>
</plugins>
</pluginManagement>
</build>
</project>
In case if java 8 is not compatible with spring anymore and we cannot download java 7 now. so how can we integrate our application with java.
please help

Spring 3.x versions support up to Java 7 only. If you want to move onto the JDK8 you should use Spring 4+.
I think there is something wrong with your tool chain. You can troubleshoot the problem by taking the following steps
Make sure that:
you're using JDK 8 for compiling your source code. You can check it
out with $ java -version
your maven is told to compile the source code with the right
compilation level. I see that you're using the maven compile plugin which is configured to
compile the target compilation level "1.6".
the Maven adds the right version of the Spring libraries. It might happen that
you have still some transient dependencies of the old Spring version
in your classpath. You can see which dependencies the project will
fetch by giving $ mvn dependency:tree
By the way, the Spring Framework will attempt to find out the JDK version while executing some internal methods. If the JDK version resolved is not listed in the supported JDK versions, it will default to the Java 1.4 so it is why we see here that "expected version must be greater than JDK 1.5" in the exception's message. It might be that you still have some older versions of the Spring in your classpath - either coming along with your servlet container e.g Tomcat or as transient.
Hope it helps.

It seems that you are having issues with your spring.xml. You are trying to use
context: component-scan packages=""
Please ensure that you have used latest spring xsd's in your schema definitions and give a try. Please let me know if you are using annotations.
I am having Spring 4.3.0 and Java 8 working perfectly fine. I have worked with Spring 4.1.3 and java 8 as well and It worked like champ. Let me know if you have any questions.

Missing artifact net.sf.jung:jung2:jar:2.0

jung2 is in maven repository, here and here.
But my Eclipse does not finding it out:
Code is here:
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>tests.jung</groupId>
<artifactId>TryJung</artifactId>
<version>0.0.1-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>net.sf.jung</groupId>
<artifactId>jung2</artifactId>
<version>2.0</version>
</dependency>
</dependencies>
</project>
UPDATE
Sorry can't accept answers about dependency type, because it is not complete. The code for jung dependency was taken from Maven repository directly:
So, I need an explanation, why doesn't code, taken from repository site, work actually.
What is happening here, who is "guilty"?

As already said, you are addressing a pom file. Which is, in a sense, correct, but if you want to compile you will need to add the actual jars in the dependencies section, such as:
<dependencies>
<dependency>
<groupId>net.sf.jung</groupId>
<artifactId>jung2</artifactId>
<version>${jung.version}</version>
<type>pom</type>
</dependency>
<dependency>
<groupId>net.sf.jung</groupId>
<artifactId>jung-api</artifactId>
<version>${jung.version}</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>net.sf.jung</groupId>
<artifactId>jung-visualization</artifactId>
<version>${jung.version}</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>net.sf.jung</groupId>
<artifactId>jung-graph-impl</artifactId>
<version>${jung.version}</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>net.sf.jung</groupId>
<artifactId>jung-algorithms</artifactId>
<version>${jung.version}</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>net.sf.jung</groupId>
<artifactId>jung-io</artifactId>
<version>${jung.version}</version>
<scope>compile</scope>
</dependency>
</dependencies>
Do not forget to define the version property also in the properties section:
<properties>
<jung.version>2.0.1</jung.version>
</properties>
Hope this helps.

The problem is simply the artifact you are adressing is a pom file and not a jar file. That's the reason for the message.

just stumbled into the same problem pit. apparently these are pom files purely for building/documenting (all) sub-projects (or submodules in maven speak) of a project (in this case jung2)
they can't be used as a dependency in a useful way
actually you can depend on them with <type>pom</type> but will just include the dependencies of that pom but not it's modules.
see here for a more complete explanation:
How to use POMs as a dependency in Maven?