NoClassDefFoundError on Maven dependency

Question

My first use of Maven and I m stuck with dependencies    I created a Maven project with Eclipse and added dependencies  and it was working without problems   But when I try to run it via command line     mvn package    successfully completes   java -cp target bil138 4-0 0 1-SNAPSHOT jar tr edu hacettepe cs b21127113 bil138 4 App   NoClassDefFoundError for dependencies   It downloads dependencies  successfully builds  but when I try to run it  I get NoClassDefFoundError   Exception in thread  main  java lang NoClassDefFoundError  org codehaus jackson JsonParseException         at tr edu hacettepe cs b21127113 bil138 4 db DatabaseManager  lt init gt  DatabaseManager java 16          at tr edu hacettepe cs b21127113 bil138 4 db DatabaseManager  lt init gt  DatabaseManager java 22          at tr edu hacettepe cs b21127113 bil138 4 App main App java 10  Caused by  java lang ClassNotFoundException  org codehaus jackson JsonParseException         at java net URLClassLoader 1 run URLClassLoader java 217          at java security AccessController doPrivileged Native Method          at java net URLClassLoader findClass URLClassLoader java 205          at java lang ClassLoader loadClass ClassLoader java 321          at sun misc Launcher AppClassLoader loadClass Launcher java 294          at java lang ClassLoader loadClass ClassLoader java 266              3 more   My pom xml is like this    lt 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  gt     lt modelVersion gt 4 0 0 lt  modelVersion gt      lt groupId gt tr edu hacettepe cs b21127113 lt  groupId gt     lt artifactId gt bil138 4 lt  artifactId gt     lt version gt 0 0 1-SNAPSHOT lt  version gt     lt packaging gt jar lt  packaging gt      lt name gt bil138 4 lt  name gt     lt url gt http   maven apache org lt  url gt      lt properties gt       lt project build sourceEncoding gt UTF-8 lt  project build sourceEncoding gt     lt  properties gt      lt dependencies gt               lt dependency gt               lt groupId gt org codehaus jackson lt  groupId gt               lt artifactId gt jackson-core-asl lt  artifactId gt                  lt  dependency gt           lt dependency gt               lt groupId gt org codehaus jackson lt  groupId gt               lt artifactId gt jackson-mapper-asl lt  artifactId gt                        lt  dependency gt     lt  dependencies gt     lt dependencyManagement gt       lt dependencies gt       lt dependency gt           lt groupId gt org codehaus jackson lt  groupId gt           lt artifactId gt jackson-core-asl lt  artifactId gt           lt version gt 1 9 6 lt  version gt       lt  dependency gt       lt dependency gt           lt groupId gt org codehaus jackson lt  groupId gt           lt artifactId gt jackson-mapper-asl lt  artifactId gt           lt version gt 1 9 6 lt  version gt       lt  dependency gt       lt  dependencies gt     lt  dependencyManagement gt   lt  project gt    Can anyone help me

User · Answer

Choosing to Project -  Clean should resolve this

User · Answer

This is due to Morphia jar not being part of your output war jar  Eclipse or local build includes them as part of classpath  but remote builds or auto scheduled build don t consider them part of classpath   You can include dependent jars using plugin   Add below snippet into your pom s plugins section       lt plugin gt           lt artifactId gt maven-assembly-plugin lt  artifactId gt           lt version gt 3 0 0 lt  version gt           lt configuration gt               lt descriptorRefs gt                   lt descriptorRef gt jar-with-dependencies lt  descriptorRef gt               lt  descriptorRefs gt           lt  configuration gt       lt  plugin gt

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You have to make classpath in pom file for your dependency  Therefore you have to copy all the dependencies into one place   Check my blog    lt build gt     lt plugins gt       lt plugin gt         lt groupId gt org apache maven plugins lt  groupId gt         lt artifactId gt maven-dependency-plugin lt  artifactId gt         lt version gt 2 1 lt  version gt         lt executions gt           lt execution gt             lt id gt copy-dependencies lt  id gt             lt phase gt package lt  phase gt             lt goals gt               lt goal gt copy-dependencies lt  goal gt             lt  goals gt             lt configuration gt               lt outputDirectory gt   project build directory  lib lt  outputDirectory gt               lt overWriteReleases gt false lt  overWriteReleases gt               lt overWriteSnapshots gt false lt  overWriteSnapshots gt               lt overWriteIfNewer gt true lt  overWriteIfNewer gt             lt  configuration gt           lt  execution gt         lt  executions gt       lt  plugin gt       lt plugin gt         lt groupId gt org apache maven plugins lt  groupId gt         lt artifactId gt maven-jar-plugin lt  artifactId gt         lt version gt 2 4 lt  version gt         lt configuration gt           lt archive gt             lt manifest gt               lt addClasspath gt true lt  addClasspath gt               lt classpathPrefix gt lib  lt  classpathPrefix gt               lt mainClass gt  fullqualified path to your main Class lt  mainClass gt             lt  manifest gt           lt  archive gt         lt  configuration gt       lt  plugin gt     lt  plugins gt   lt  build gt

User · Answer

For some reason  the lib is present while compiling  but missing while running   My situation is  two versions of one lib conflict   For example  A depends on B and C  while B depends on D 1 0  C depends on D 1 1  maven may  just import D 1 0  If A uses one class which is in D 1 1 but not in D 1 0  a NoClassDefFoundError will be throwed   If you are in this situation too  you need to resolve the dependency conflict

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I was able to work around it by running mvn install install-file with -Dpackaging class  Then adding entry to POM as described here

User · Answer

By default  Maven doesn t bundle dependencies in the JAR file it builds  and you re not providing them on the classpath when you re trying to execute your JAR file at the command-line  This is why the Java VM can t find the library class files when trying to execute your code  You could manually specify the libraries on the classpath with the -cp parameter  but that quickly becomes tiresome  A better solution is to  quot shade quot  the library code into your output JAR file  There is a Maven plugin called the maven-shade-plugin to do this  You need to register it in your POM  and it will automatically build an  quot uber-JAR quot  containing your classes and the classes for your library code too when you run mvn package  To simply bundle all required libraries  add the following to your POM   lt project gt           lt build gt       lt plugins gt         lt plugin gt           lt groupId gt org apache maven plugins lt  groupId gt           lt artifactId gt maven-shade-plugin lt  artifactId gt           lt version gt 3 2 4 lt  version gt           lt executions gt             lt execution gt               lt phase gt package lt  phase gt               lt goals gt                 lt goal gt shade lt  goal gt               lt  goals gt             lt  execution gt           lt  executions gt         lt  plugin gt       lt  plugins gt     lt  build gt         lt  project gt   Once this is done  you can rerun the commands you used above    mvn package   java -cp target bil138 4-0 0 1-SNAPSHOT jar tr edu hacettepe cs b21127113 bil138 4 App  If you want to do further configuration of the shade plugin in terms of what JARs should be included  specifying a Main-Class for an executable JAR file  and so on  see the  quot Examples quot  section on the maven-shade-plugin site

User · Answer

when I try to run it  I get NoClassDefFoundError   Run it how  You re probably trying to run it with eclipse without having correctly imported your maven classpath  See the m2eclipse plugin for integrating maven with eclipse for that   To verify that your maven config is correct  you could run your app with the exec plugin using   mvn exec java -D exec mainClass  lt your main class gt    Update  First  regarding your error when running exec java  your main class is tr edu hacettepe cs b21127113 bil138 4 App  When talking about class names  they re  almost  always dot-separated  The simple class name is just the last part  App in your case  The fully-qualified name is the full package plus the simple class name  and that s what you give to maven or java when you want to run something  What you were trying to use was a file system path to a source file  That s an entirely different beast  A class name generally translates directly to a class file that s found in the class path  as compared to a source file in the file system  In your specific case  the class file in question would probably be at target classes tr edu hacettepe cs b21127113 bil138 4 App class because maven compiles to target classes  and java traditionally creates a directory for each level of packaging   Your original problem is simply that you haven t put the Jackson jars on your class path  When you run a java program from the command line  you have to set the class path to let it know where it can load classes from  You ve added your own jar  but not the other required ones  Your comment makes me think you don t understand how to manually build a class path  In short  the class path can have two things  directories containing class files and jars containing class files  Directories containing jars won t work  For more details on building a class path  see  Setting the class path  and the java and javac tool documentation   Your class path would need to be at least  and without the line feeds   target bil138 4-0 0 1-SNAPSHOT jar   home utdemir  m2 repository org codehaus jackson jackson-core-asl 1 9 6 jackson-core-asl-1 9 6 jar   home utdemir  m2 repository org codehaus jackson jackson-mapper-asl 1 9 6 jackson-mapper-asl-1 9 6 jar   Note that the separator on Windows is a semicolon       I apologize for not noticing it sooner  The problem was sitting there in your original post  but I missed it

[java] NoClassDefFoundError on Maven dependency

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