Maven determine what version of the dependency is being used -


i have inherited maven project (i still learning maven).

the project has 3 modules there parent pom 3 modules inherit from.

i need make changes pom.xml changes requested.

after made changes , run project got error.

caused by: java.lang.classnotfoundexception: org.quartz.spi.classloadhelper

so noticed pom.xml had exclusion follows:

   <dependency>         <groupid>com.mycompany</groupid>         <artifactid>framework</artifactid>         <version>1.0.9</version>         <exclusions>             <exclusion>                 <groupid>org.quartz-scheduler</groupid>                 <artifactid>quartz</artifactid>             </exclusion>         <exclusion>     </dependency>

so removed exclusion , ran project again following error

    caused by: java.lang.incompatibleclasschangeerror:  class org.springframework.scheduling.quartz.crontriggerbean  has interface org.quartz.crontrigger super class

so looks exclusion meant because other dependency satisfying quartz dependency.

and looks after added new dependencies somehow quartz dependency has been excluded.

my question is:

how determine bringing in quartz dependency ? how ensure adding new dependencies not exclude existing quartz dependency ?

take @ command 

    mvn dependency:tree

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