eclipse-groovy compiler - IDE shows no error but compile fails

We are using eclipse-groovy compiler for a project which has both java and groovy. 

The groovy class file containing below line is fine with no errors in IDE.

((configMap.get('key1') as Map<String, Object>).get('key2')) as List<Map<String, String>>

The groovy class is annotated with "CompileStatic"

But both build in IDE and maven build fails with error - Error:(233, -1) Groovy-Eclipse: Groovy:expecting '}', found 'for' @ line 233, column 9.

can you please help me understand why this syntax error not displayed in IDE?

Thanks in advance.