MavenError Failed to execute goal on project Could not resolve dependencies In Maven Multimodule project

Question

I am trying to create a maven multi-module project  the project is created successfully but when I am trying to use one module as a dependency of another module  it throws an exception  When I create a module using eclipse  I was selecting packaging as a jar  but when the module is created  the packaging tag was not mention in child pom xml and I manually insert the packaging tag as a jar   following is my parent pom xml     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 com netsol lt  groupId gt   lt artifactId gt empirecl lt  artifactId gt   lt version gt 0 0 1-SNAPSHOT lt  version gt   lt packaging gt pom lt  packaging gt  -------------------------  lt modules gt       lt module gt empirecl-web lt  module gt       lt module gt empirecl-dao lt  module gt       lt module gt empirecl-service lt  module gt       lt module gt empirecl-api lt  module gt   lt  modules gt    Dao Child Module     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 parent gt       lt groupId gt com netsol lt  groupId gt       lt artifactId gt empirecl lt  artifactId gt       lt version gt 0 0 1-SNAPSHOT lt  version gt       lt relativePath gt    pom xml lt  relativePath gt   lt  parent gt   lt artifactId gt empirecl-dao lt  artifactId gt   lt packaging gt jar lt  packaging gt   lt name gt empirecl-dao lt  name gt  ------------------------   Service Child Module     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 parent gt       lt groupId gt com netsol lt  groupId gt       lt artifactId gt empirecl lt  artifactId gt       lt version gt 0 0 1-SNAPSHOT lt  version gt       lt relativePath gt    pom xml lt  relativePath gt   lt  parent gt   lt artifactId gt empirecl-service lt  artifactId gt   lt packaging gt jar lt  packaging gt   lt name gt empirecl-service lt  name gt    lt dependencies gt       lt dependency gt           lt groupId gt com netsol lt  groupId gt           lt artifactId gt empirecl-dao lt  artifactId gt           lt version gt 0 0 1-SNAPSHOT lt  version gt           lt type gt jar lt  type gt       lt  dependency gt  ------------------------------------------   The Dao module maven clean and install successfully  but when i trying to use service module  it will generate an following exception     ERROR  Failed to execute goal on project empirecl-service  Could not resolve dependencies for project com netsol empirecl-service jar 0 0 1-SNAPSHOT  Failed to collect dependencies at com netsol empirecl-dao jar 0 0 1-SNAPSHOT  Failed to read artifact descriptor for com netsol empirecl-dao jar 0 0 1-SNAPSHOT  Could not find artifact com netsol empirecl pom 0 0 1-SNAPSHOT - gt   Help 1  org apache maven lifecycle LifecycleExecutionException  Failed to execute goal on project empirecl-service  Could not resolve dependencies for project com netsol empirecl-service jar 0 0 1-SNAPSHOT  Failed to collect dependencies at com netsol empirecl-dao jar 0 0 1-SNAPSHOT   I am trying the find to solution from web  but still the solution is not found  In eclipse when i open the Dependency Hierarchy of service module  it shown the DAO module as a folder not jar  below is the screen shot of Dependency Hierarchy of service module

User · Answer

In case anybody comes back to this  I think the problem here was failing to install the parent pom first  which all these submodules depend on  so the Maven Reactor can t collect the necessary dependencies to build the submodule   So from the root directory  here D  luna workspace empire club empirecl  it probably just needs a    mvn clean install    Aside   lt relativePath gt    pom xml lt  relativePath gt  is not really necessary as it s the default value

User · Answer

My solution    remove all projects in current workspace import all again maven update project  Alt   F5  -  Select All and check Force Update of Snapshots Releases maven build  Ctrl   B  until there is nothing to build   It worked for me after the second try

User · Answer

For me  adding the following block of code under  lt dependency management gt  lt dependencies gt  solved the problem   lt dependency gt       lt groupId gt org glassfish lt  groupId gt       lt artifactId gt javax el lt  artifactId gt       lt version gt 3 0 1-b06 lt  version gt   lt  dependency gt

User · Answer

In my case I forgot it was packaging conflict jar vs pom  I forgot to write    lt packaging gt pom lt  packaging gt    In every child pom xml file

User · Answer

My solution was to insert  lt packaging gt pom lt  packaging gt  between artifactId and version   lt groupId gt com onlinechat lt  groupId gt   lt artifactId gt chat-online lt  artifactId gt   lt packaging gt pom lt  packaging gt   lt version gt 1 0-SNAPSHOT lt  version gt   lt modules gt       lt module gt server lt  module gt       lt module gt client lt  module gt       lt module gt network lt  module gt   lt  modules gt

[java] MavenError: Failed to execute goal on project: Could not resolve dependencies In Maven Multimodule project

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