jacobmarcus opened a new issue, #14166:
URL: https://github.com/apache/grails-core/issues/14166

   This issue is related to 
https://github.com/grails-plugins/grails-cache/issues/49. 
   
   grails -v
   _Grails Version: 3.3.7
   Groovy Version: 2.4.15
   JVM Version: 1.8.0_222_
   
   The following service method will give the stacktrace below. Issue is with 
how the key is formed. 
   It works without the @Transactional annotation. Version of cache plugin is 
**4.0.3**.
   
   ```
       @Transactional(readOnly=true)
       @Cacheable(value='codes', key={code + '' + layer})
       def getCachedData(String code, String layer){
         return 'some code'
       }
   ```
   
   Caused by: java.lang.NoSuchMethodError: 
java.lang.String.plus(Ljava/lang/CharSequence;)Ljava/lang/String;
           at 
helloworld.SimpleService$__tt__getCachedData_closure4.doCall(SimpleService.groovy:89)
           at 
grails.plugin.cache.CustomCacheKeyGenerator.generate(CustomCacheKeyGenerator.groovy:115)
           at 
grails.gorm.transactions.GrailsTransactionTemplate$2.doInTransaction(GrailsTransactionTemplate.groovy:94)
           at 
org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:133)
   
   


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