java.lang.NoClassDefFoundError in uber jar - java

I am creating a jar with dependencies. Here is the relevant section in my POM
<build>
<resources>
<resource>
<directory>src/main/resources</directory>
<filtering>true</filtering>
</resource>
<resource>
<directory>${project.basedir}</directory>
<includes>
<include>lib/*.jar</include>
</includes>
</resource>
</resources>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.5.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<version>2.2</version>
<configuration>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
<archive>
<manifest>
<mainClass>path.to.main.Main</mainClass>
</manifest>
<manifestEntries>
<Class-Path>.</Class-Path>
</manifestEntries>
</archive>
</configuration>
<executions>
<execution>
<id>make-assembly</id>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
i can build the jar just fine with mvn clean install. however when i run it
java -jar myProject-0.0.1-SNAPSHOT-jar-with-dependencies.jar, i get a java.lang.NoClassDefFoundError on a class which comes from the jar within the lib folder.
Note that i had included this jar by
<resource>
<directory>${project.basedir}</directory>
<includes>
<include>lib/*.jar</include>
</includes>
</resource>
so why am i getting the error? what am i doing wrong? Also, when i unzip the jar, i see the lib folder and the jar within. So why cant the myProject-0.0.1-SNAPSHOT-jar-with-dependencies.jar find it?
Update
i added
<plugin>
<artifactId>maven-dependency-plugin</artifactId>
<executions>
<execution>
<phase>install</phase>
<goals>
<goal>copy-dependencies</goal>
</goals>
<configuration>
<outputDirectory>${project.build.directory}/lib</outputDirectory>
</configuration>
</execution>
</executions>
</plugin>
and on mvn clean install i see this on the console
[INFO] Copying my3rdParty.jar to path/to/project/target/lib/biomedical-my3rdParty-0.0.1.jar


Check your inclusions in the built JAR. Typically you'll run into this if you have a duplicate of this class included on your classpath (in your fat JAR). See if the class in question was double-included. Either that, or what the above user said (it's not structured correctly in the built JAR).

Related

How to create single jar with dependencies in maven

I am trying to create single fat jar using maven assembly plugin but somehow after running maven clean install it give 2 jars, one is client-1.0-SNAPSHOT.jar and other one is client-1.0-SNAPSHOT-jar-with-dependencies.jar.
I am only interested to create a jar with dependencies so dont know why the other jar is also creating by this assemble plugin.
Can someone tell me how to eliminate this jar Or should i use some other maven command rather than clean install ?
<build>
<finalName>${project.artifactId}-${project.version}</finalName>
<resources>
<resource>
<directory>${basedir}/src/main/resources</directory>
<excludes>
<exclude>*.properties</exclude>
</excludes>
</resource>
</resources>
<plugins>
<!-- download source code in Eclipse, best practice -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-eclipse-plugin</artifactId>
<version>2.9</version>
<configuration>
<downloadSources>true</downloadSources>
<downloadJavadocs>false</downloadJavadocs>
</configuration>
</plugin>
<!-- Set a compiler level -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<source>${jdk.version}</source>
<target>${jdk.version}</target>
</configuration>
</plugin>
<!-- Maven Assembly Plugin -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<version>2.4.1</version>
<configuration>
<!-- get all project dependencies -->
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
-->
<!-- MainClass in mainfest make a executable jar -->
<archive>
<manifest>
<mainClass>com.app.MainApp</mainClass>
</manifest>
</archive>
</configuration>
<executions>
<execution>
<id>make-assembly</id>
<!-- bind to the packaging phase -->
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-resources-plugin</artifactId>
<version>2.5</version>
<executions>
<execution>
<id>copy-resources</id>
<phase>install</phase>
<goals>
<goal>copy-resources</goal>
</goals>
<configuration>
<!-- overwrite! -->
<overwrite>true</overwrite>
<outputDirectory>${project.basedir}/target</outputDirectory>
<resources>
<resource>
<directory>${project.basedir}/</directory>
<includes>
<include>*.properties</include>
</includes>
</resource>
</resources>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>

Run maven web application from command line

I'm trying to run my maven web application through:
java -jar CliniKeyMaven-1.0-SNAPSHOT.war
First, I faced the error no main manifest attribute in CliniKeyMaven-1.0-SNAPSHOT.war and after searching for a quite long time I reached this in my pom.xml:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>2.1.1</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>manifest</goal>
</goals>
</execution>
</executions>
<configuration>
<failOnMissingWebXml>false</failOnMissingWebXml>
<attachClasses>true</attachClasses>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<mainClass>com.mycompany.clinikeymaven.App</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
and this is the App.java that contains a main:
package com.mycompany.clinikeymaven;
public class App {
public static void main( String[] args ) {
System.out.println( "Hello World!" );
}
}
But I'm now facing the error:
Could not find or load main class com.mycompany.clinikeymaven.App
When I run the application from the NetBeans it is working but I need to run it from the command line.. what should I do?

this is a working pom .Pls try this one.
<build>
<plugins>
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<version>3.0.0</version>
<configuration>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<mainClass>com.mycompany.clinikeymaven.App</mainClass>
</manifest>
</archive>
</configuration>
<executions>
<execution>
<id>make-assembly</id>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.0</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
</plugins>
<resources>
<resource>
<directory>src/main/resources</directory>
</resource>
</resources>
</build>

You need to user the Maven jar plugin and not the Maven war plugin
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>2.4</version>
<configuration>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<mainClass>com.mycompany.clinikeymaven.App</mainClass>
</manifest>
<compress>true</compress>
<index>true</index>
</archive>
</configuration>
</plugin>
Also as people said in the comments, with the maven-war-plugin you are creating a .war file that needs an application server to be deployed on in order to run.
For example the generating .war could be deployed on in tomcat server.

Try
java -cp CliniKeyMaven-1.0-SNAPSHOT.war com.mycompany.clinikeymaven.App
Alternately, you can update the content of your manifest file to following:
Main-Class: com.mycompany.clinikeymaven.App
Then you can try running it the following way:
java -jar CliniKeyMaven-1.0-SNAPSHOT.war

Maven manifest file issue

I have been struggling with this for some time. I have a Maven project that builds and packages just fine with one problem. I have a jar I am using that is NOT in my companies version of NEXUS. I added the jar to my .m2 repository through this command line command:
mvn install:install-file -Dfile=c:/u/lib/terajdbc4-15.00.00.20.jar -DgroupId=com.teradata -DartifactId=terajdbc4 -Dversion=15.00.00.20 -Dpackaging=jar
This jar will NOT append to the manifest file when the jar is built. So, when I need this jar, the code dies because it can't find the resource it's looking for (the teradata driver)
Is there any way to add this single jar to the manifest file IN ADDITION TO the other jars I'm already adding to the manifest?
Here is the build section from the parent pom file:
<build>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.1</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
</plugins>
</pluginManagement>
<plugins>
<plugin>
<artifactId>maven-resources-plugin</artifactId>
<version>2.6</version>
<executions>
<execution>
<id>copy-resources</id>
<phase>validate</phase>
<goals>
<goal>copy-resources</goal>
</goals>
<configuration>
<outputDirectory>${basedir}/target/Crunchify</outputDirectory>
<resources>
<resource>
<directory>resources</directory>
<filtering>true</filtering>
</resource>
</resources>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<executions>
<execution>
<id>copy-dependencies</id>
<phase>prepare-package</phase>
<goals>
<goal>copy-dependencies</goal>
</goals>
<configuration>
<outputDirectory>${project.build.directory}/Crunchify/lib</outputDirectory>
<overWriteReleases>false</overWriteReleases>
<overWriteSnapshots>false</overWriteSnapshots>
<overWriteIfNewer>true</overWriteIfNewer>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<configuration>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<classpathPrefix>lib/</classpathPrefix>
<mainClass>ap.invalert.handler.InvAlertHandler</mainClass>
</manifest>
<manifestEntries>
<Class-Path>.</Class-Path>
</manifestEntries>
</archive>
<finalName>Crunchify/Crunchify</finalName>
</configuration>
</plugin>
</plugins>
</build>

Maven jar-with-dependencies without target\classes (build artifacts)

I want to create an executable jar (with all the *.class of my code in it).
However, I don't want the Jar to include the resources that during compilation are in my src/main/resources path.
my project hierarchy is:
project
-src
-main
-resources
-resources_setting.xml
-target
-classes
-resources_setting.xml
I want my jar to include only the classes of main and the dependencies, not the resources inside target\classes or inside resources.
How do I do that?
I am using maven-assembly-plugin, like this:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<configuration>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
<archive>
<manifest>
<mainClass>cqm.qa.Main</mainClass>
</manifest>
</archive>
</configuration>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>

For bundling purpose, I usually used the maven-shade-plugin and the settings are described below. It will work same as assembly plugin.
<profile>
<id>generate-shaded-jar</id>
<activation>
<activeByDefault>false</activeByDefault>
</activation>
<build>
<resources>
<resource>
<directory>src/main/resources</directory>
<excludes>
<exclude>**</exclude>
</excludes>
</resource>
</resources>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<transformers>
<transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<manifestEntries>
<Main-Class>cqm.qa.Main</Main-Class>
<Class-Path>.</Class-Path>
</manifestEntries>
</transformer>
</transformers>
<filters>
<filter>
<artifact>*:*</artifact>
<excludes>
<exclude>log4j.properties</exclude>
<exclude>details.properties</exclude>
</excludes>
</filter>
</filters>
</configuration>
</execution>
</executions>
<configuration>
<finalName>cqm-full</finalName>
</configuration>
</plugin>
</plugins>
</build>
</profile>
In the above configuration, I've excluded log4j.properties and details.properties from the final jar with dependencies with name cqm-full.jar
Update
Invoke the profile using mvn install -Pgenerate-shaded-jar
Now resource files from src/main/resources won't get added in cqm-full.jar. If invoked without profile mvn clean install, you can still view the resources in the jar

Jar file created by Maven does not have project code

I am trying to make an executable jar with dependancies using Maven. And have tried making the jar with commands:
mvn clean assembly:single
mvn clean compile assembly:single
mvn clean compile package assembly:single
I get the jar, but it does not have the project code. Could please point me in the right direction. My POM build section is below.
<build>
<plugins>
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<configuration>
<archive>
<manifest>
<mainClass>My.Full.Path.Main</mainClass>
</manifest>
</archive>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>

Your project has non-standard directory layout, tell maven where is your source code located.
Maven configuration for custom directory layout (pom.xml)
<build>
<sourceDirectory>src/main/java</sourceDirectory>
<testSourceDirectory>src/test/java</testSourceDirectory>
<resources>
<resource>
<directory>src/main/resources</directory>
</resource>
</resources>
<testResources>
<testResource>
<directory>src/test/resources</directory>
</testResource>
</testResources>
</build>
Replace directory location (like src/main/java) with your project source location.
Additional source directories
If your existing project has more src directory, then you can use build-helper-maven-plugin:add-source
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>build-helper-maven-plugin</artifactId>
<version>1.8</version>
<executions>
<execution>
<id>add-source</id>
<phase>generate-sources</phase>
<goals>
<goal>add-source</goal>
</goals>
<configuration>
<sources>
<source>some directory</source>
</sources>
</configuration>
</execution>
</executions>
</plugin>
Building
To build properly configured project use command
mvn package

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