How to scan multiple paths using the ComponentScan annotation

Question

I m using Spring 3 1 and bootstrapping an application using the  Configuration and  ComponentScan attributes   The actual start is done with  new AnnotationConfigApplicationContext MyRootConfigurationClass class     This Configuration class is annotated with   Configuration  ComponentScan  com my package   public class MyRootConfigurationClass   and this works fine  However I d like to be more specific about the packages I scan so I tried    Configuration  ComponentScan  com my package first com my package second   public class MyRootConfigurationClass   However this fails with errors telling me it can t find components specified using the  Component annotation   What is the correct way to do what I m after   Thanks

User · Accepted Answer

ComponentScan uses string array  like this    ComponentScan   com my package first   com my package second      When you provide multiple package names in only one string  Spring interprets this as one package name  and thus can t find it

User · Answer

You can also use  ComponentScans annotation    ComponentScans value      ComponentScan  com my package first                               ComponentScan  com my package second

User · Answer

I use    ComponentScan basePackages     com package1   com package2   com package3    com packagen

User · Answer

There is another type-safe alternative to specifying a base-package location as a String  See the API here  but I ve also illustrated below    ComponentScan basePackageClasses    ExampleController class  ExampleModel class  ExmapleView class     Using the basePackageClasses specifier with your class references will tell Spring to scan those packages  just like the mentioned alternatives   but this method is both type-safe and adds IDE support for future refactoring -- a huge plus in my book   Reading from the API  Spring suggests creating a no-op marker class or interface in each package you wish to scan that serves no other purpose than to be used as a reference for by this attribute   IMO  I don t like the marker-classes  but then again  they are pretty much just like the package-info classes  but the type safety  IDE support  and drastically reducing the number of base packages needed to include for this scan is  with out a doubt  a far better option

User · Answer

Provide your package name separately  it requires a String   for package names   Instead of this    ComponentScan  com my package first com my package second     Use this    ComponentScan   com my package first   com my package second

User · Answer

You use ComponentScan to scan multiple packages using    ComponentScan   com my package first   com my package second

User · Answer

Another way of doing this is using the basePackages field  which is a field inside ComponentScan annotation    ComponentScan basePackages   com firstpackage   com secondpackage      If you look into the ComponentScan annotation  class from the jar file you will see a basePackages field that takes in an array of Strings  public  interface ComponentScan   String   basePackages   default         Or you can mention the classes explicitly  Which takes in array of classes  Class lt   gt     basePackageClasses

User · Answer

make sure you have added this dependency in your pom xml   lt dependency gt       lt groupId gt org springframework boot lt  groupId gt       lt artifactId gt spring-boot-starter-web lt  artifactId gt   lt  dependency gt

[java] How to scan multiple paths using the @ComponentScan annotation?

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