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Asked: 2026-06-18T10:55:32+00:00

I am trying to convert a Json String to a HashMap but it is

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I am trying to convert a Json String to a HashMap but it is not working.
My code:

 ObjectMapper mapper = new ObjectMapper();
 Map<String,Object> map = mapper.readValue("Json String placeholder", Map.class);

I get the following exception:

 java.lang.NoClassDefFoundError: com/fasterxml/jackson/annotation/JsonAutoDetect
at com.fasterxml.jackson.databind.introspect.VisibilityChecker$Std.<clinit>(VisibilityChecker.java:172)
at com.fasterxml.jackson.databind.ObjectMapper.<clinit>(ObjectMapper.java:195)
.....

What am I doing wrong? Is there another possibility to convert it? Or is anything missing?

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1 Answer

  1. Editorial Team

    NoClassDefFoundError is not specific to your particular use with JSON but occurs if a class that was available at compile time cannot be found by JVM at runtime. How can that happen? Most frequently it happens if your compilation classpath is different from your execution one. I have seen it happen with ant a lot. Make sure the pertinent jar is included in the execution classpath.

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