How to return JSON data from spring Controller using ResponseBody

Question

Spring version 4 2 0  Hibernate 4 1 4 Here is my Controller function    RequestMapping value     mobile getcomp   method   RequestMethod GET   ResponseBody public List lt Company gt   listforCompanies               List lt Company gt  listOfCompanies  new ArrayList lt Company gt                 listOfCompanies   companyManager getAllCompanies        return listOfCompanies      Jackson JSON mapper dependency in Pom xml        lt  -- Jackson JSON Mapper -- 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   jackson version  lt  version gt       lt  dependency gt    Getting the list in my ArrayList  but when returning the following error is shown   SEVERE  Servlet service   for servlet  dispatcherServlet  in context with path   IrApp  threw exception  Request processing failed  nested exception is java lang IllegalArgumentException  No converter found for return value of type  class java util ArrayList  with root cause     java lang IllegalArgumentException  No converter found for return value of type  class java util ArrayList         at org springframework util Assert isTrue Assert java 68          at org springframework web servlet mvc method annotation AbstractMessageConverterMethodProcessor writeWithMessageConverters AbstractMessageConverterMethodProcessor java 124    Link to the example I m following

User · Answer

When I was facing this issue  I simply put just getter setter methods and my issues were resolved   I am using Spring boot version 2 0

User · Answer

Add the below dependency to your pom xml    lt dependency gt       lt groupId gt com fasterxml jackson core lt  groupId gt       lt artifactId gt jackson-databind lt  artifactId gt       lt version gt 2 5 0 lt  version gt   lt  dependency gt

User · Answer

In my case I was using jackson-databind-2 8 8 jar that is not compatible with JDK 1 6 I need to use so Spring wasn t loading this converter  I downgraded the version and it works now

User · Answer

I was using groovy springboot and got this error       Adding getter setter is enough if we are using below dependency    implementation  org springframework boot spring-boot-starter-web    As Jackson core classes come with it

User · Answer

Yes just add the setters getters with public modifier

User · Answer

I was facing same issue  I did not put  ResponseBody since I was using  RestController  But still I was getting error because I did not put the getter setter method for the Company class  So after putting the getter setter my problem was resolved

User · Answer

You also need to be sure that returned bean is not empty  and can be serialized by Jackson   In my particular case I tried to return an instance of an object without getters and setters and without any jackson annotation and with fields equals to null  I got following message   com fasterxml jackson databind JsonMappingException      No serializer found for class com foo bar Baz and no properties discovered to create BeanSerializer  to avoid exception  disable SerializationFeature FAIL ON EMPTY BEANS

User · Answer

Considering  Arpit answer  for me it worked only when I add two jackson dependencies    lt dependency gt       lt groupId gt com fasterxml jackson core lt  groupId gt       lt artifactId gt jackson-core lt  artifactId gt       lt version gt 2 4 3 lt  version gt   lt  dependency gt   lt dependency gt       lt groupId gt com fasterxml jackson core lt  groupId gt       lt artifactId gt jackson-databind lt  artifactId gt       lt version gt 2 4 3 lt  version gt   lt  dependency gt    and configured  of cause  web xml  lt mvc annotation-driven  gt    Original answer that helped me is here  https   stackoverflow com a 33896080 3014866

[java] How to return JSON data from spring Controller using @ResponseBody

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